USRE43685E1 - Apparatus and method for measurement for dynamic laser signals - Google Patents
Apparatus and method for measurement for dynamic laser signals Download PDFInfo
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- USRE43685E1 USRE43685E1 US13/048,743 US200313048743A USRE43685E US RE43685 E1 USRE43685 E1 US RE43685E1 US 200313048743 A US200313048743 A US 200313048743A US RE43685 E USRE43685 E US RE43685E
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06832—Stabilising during amplitude modulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06835—Stabilising during pulse modulation or generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/504—Laser transmitters using direct modulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06808—Stabilisation of laser output parameters by monitoring the electrical laser parameters, e.g. voltage or current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06812—Stabilisation of laser output parameters by monitoring or fixing the threshold current or other specific points of the L-I or V-I characteristics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
Definitions
- the present invention relates to a circuit and method used to calibrate and compensate for laser performance in systems such as an optical communications links, medical diagnostic systems and any other system utilizing lasers. Performance compensation is achieved in a non-invasive manner without disruption of the laser signal transmission or other operating parameters of the laser.
- the Digital Controller ( 111 ) requires feedback information from light output ( 107 ).
- obtaining feedback information becomes problematic since the light output ( 107 ) constantly changes depending on the Drive Signal ( 100 ) the system is transmitting.
- any attempts to measure the light output ( 107 ) will encounter errors, which can render the feedback information unusable.
- the Drive Signal ( 100 ) needs to be maintained at a fixed power level in order for the system to produce a steady value of the Light Output ( 107 ) so that calibration adjustments can be made. This procedure disrupts the signal transmission and, because of this, the transmitter cannot send information over the optical communications channel while the calibration is carried out. Disruption in communication is contrary to the goals of high reliability and 100% up time in present systems.
- the Photodiode Sensor ( 109 ) operates as a band-limiting filter converting the response to a variety of waveforms as follows:
- the present invention provides a circuit and a method for calibrating the Light Output ( 107 ) of the laser without affecting the data transmission. This is consistent with goals of high reliability because at no time is the data transmission disrupted.
- the present system contains a laser output measurement circuit used in a laser control system ( 114 ).
- the circuits contain a photodiode sensor ( 200 ), sample and hold amplifier ( 202 ), IC with synchronizer and delay circuits ( 206 ), and an analog to digital converter ( 204 ).
- the circuits measure the laser light output ( 107 ) while the laser Module ( 106 ) transmits signals.
- the measurement circuit tracks and stores the laser light output ( 107 ) signal using a Photodiode Sensor ( 109 ) and with a Sample/hold ( 202 ).
- the methods calculate the value of the laser light output ( 107 ) from mathematical relationships, which correlate the light output ( 107 ) of the laser Module ( 106 ) to the current value of the drive signal ( 100 ).
- Yet another advantage of this invention is that adjustments to account for temperature changes, aging and other effects are done only as needed and by the amount needed. This contributes to extending the life of the laser.
- FIG. 1 illustrates a control system diagram for a laser transmitter. This control system shows a configuration presented in previous applications of the same inventor.
- FIG. 2 illustrates a diagram of the Output Signal Sampler.
- FIG. 3 illustrates an embodiment of the Output Signal Sampler.
- FIG. 4 illustrates the timing diagram for the calibration process.
- FIG. 5 illustrates a circuit, which can be used to facilitate field calibration.
- FIG. 6 illustrates the power measurement calibration
- FIG. 7 illustrates the factory calibration of the sensor circuit.
- FIG. 1 a block diagram is shown for a Laser Control System ( 114 ).
- the system consists of a drive Signal Input ( 100 ) applied to a Laser Module Driver ( 101 ), which contains a Bias Current Generator ( 102 ) and a Modulation Current Generator ( 103 ).
- a Bias Control Signal ( 112 ) and a Modulation Control Signal ( 113 ) control the current generators.
- the Driver ( 101 ) produces Modulation Current ( 104 ) and Bias Current ( 105 ) that are applied to the Laser Module ( 106 ).
- the Laser Module ( 106 ) in turn produces Light Output ( 107 ).
- the magnitude of the Light Output ( 107 ) bears a relationship to the magnitude of the Modulation Current ( 104 ) and the Bias Current ( 105 ).
- a portion of the Light Output ( 107 ) from the laser is sensed. This portion constitutes the Optical Power Sense ( 108 ), which is coupled to a Photodiode Sensor ( 109 ).
- the Photodiode Sensor Output ( 110 ) is connected to a Digital Controller ( 111 ).
- the Digital Controller ( 111 ) contains algorithms for laser control and also determines the magnitudes of the Bias Current Generator ( 102 ) and Modulation Current ( 103 ).
- FIG. 2 shows the output signal sampler apparatus of this invention.
- This consists of a Photodiode Sensor ( 109 ), which generates a Photodiode Signal ( 201 ) in response to the application of a portion of the Laser Light Output ( 107 ).
- the Photodiode Output may be a fast response or an exponential rise and decay signal.
- the Sample and Hold Amplifier ( 202 ) receives the Photodiode Sensor Signal ( 201 ) and stores the value of the signal at the appropriate time as directed by the Sample and Hold Control ( 205 ). Once the Sample and Hold Amplifier ( 202 ) has stored the signal, it is sent to the Analog to Digital Converter ( 204 ), which is contained in the Digital Controller ( 111 ).
- the Sample and Hold Amplifier ( 202 ) is connected to the Analog to Digital Converter ( 204 ).
- the Sample and Hold Control ( 205 ) is produced by the Synchronizer and Delay Circuits ( 206 ). These circuits utilize real-time information of the state of the Drive Signal ( 100 ), which connects to the Drive Signal ( 100 ) at ( 208 ) in order to determine when the Sample and Hold Control ( 205 ) is activated.
- the Synchronizer and Delay Circuits ( 206 ) are controlled by the Digital Controller ( 111 ) with the necessary Logic Output ( 207 ).
- the Digital Controller ( 111 ) contains algorithms that are capable of utilizing a multiplicity of Photodiode Sensor information including an exponential rise and decay, a square wave response, and an average signal output.
- the algorithms utilize information related to the sequence of values of the Drive Signal ( 100 ) input and correlate those values to the magnitude of the Photodiode Sensor ( 109 ) output.
- the controller can then make adjustments to the Bias Current ( 105 ) and Modulation Current ( 104 ), in order to optimize the extinction ratio and the Bit Error Rate.
- FIG. 3 is an embodiment of the Output Signal Sampler in this invention.
- the Drive Signal ( 100 ) applied to the Driver ( 103 ) produces a Light Output ( 107 ).
- a portion of the optical power is coupled to the Photodiode Sensor ( 109 ).
- the Photodiode Sensor ( 109 ) produces a current, which is converted to a voltage by the Transimpedance Amplifier ( 301 ).
- This voltage drives the Sample and Hold Amplifier ( 302 ) (202), which in turn produces a steady sample of the sensor signal at ( 304 ) to the Analog to Digital Converter ( 304 ).
- the Sample and Hold Amplifier ( 202 ) stores the sensor information in a Capacitor C H ( 316 ).
- the capacitor is chosen so that the capturing of the sensor signal is done at high speed while at the same time the capacitor maintains the value of the captured sensor signal during the analog to digital conversion.
- the capacitor may need to be relatively small in the tens of picofarads in order for the Sample and Hold Amplifier ( 202 ) to successfully track the sensor signal.
- the Transimpedance Amplifier ( 301 ) and the Sample and Hold Amplifier ( 202 ) are designed in such a way that they will be substantially faster then the Photodiode Sensor ( 109 ) in order to insure that the Photodiode Sensor ( 109 ) determines the frequency response.
- a critical feature of the present invention is the appropriate timing of the Sample and Hold Control ( 205 ).
- This control must be able to capture the Photodiode Sensor ( 109 ) signal at a predictable time in order to anticipate the state of the Drive Signal ( 100 ) and the Light Output ( 107 ).
- the timing synchronization circuit determines this. This circuit starts by sampling the Drive Signal ( 100 ) at ( 315 ). This is done with the use of a Buffer ( 314 ) in order to avoid a significant load on the Drive Signal ( 100 ).
- the output of the Buffer ( 314 ) is sent to a set of n signal propagation delays. These delays consist of Delay 1 ( 312 ) to Delay n ( 313 ).
- the Digital Controller utilizes the Input Select ( 308 ) of the Digital Multiplexer ( 309 ) in order to select any of the n signal propagation delays.
- a zero to one transmission of the Drive Signal ( 100 ) will cause, after a time delay, a zero to one transition at the Set Input ( 307 ) of the Set Reset Latch ( 305 ).
- This transition in turn causes a zero to one transition of the Sample and Hold Control ( 205 ), which places the Sample and Hold Amplifier ( 202 ) in hold mode in order to prepare the system for an analog to digital conversion.
- the Set Reset Latch ( 305 ) is placed in reset mode by the Reset Signal ( 306 ) generated by the Digital Controller ( 111 ). This last step will then place the Sample and Hold Amplifier ( 202 ) in sample mode so that the system can be ready for the next calibration cycle.
- FIG. 3 shows the propagation delays associated with the Output Signal Sampler.
- the Analog to Digital Converter ( 204 ) When the S/H ( 408 ) is in hold mode after the transition at 409 , the Analog to Digital Converter ( 204 ) performs an analog to digital conversion, which will last for a period of time t A/D ( 412 ). The duration of the analog to digital conversion can be relatively slow as required by the Analog to Digital Converter ( 204 ). At the end of the conversion, the Digital Controller ( 111 ) will cause the S/H ( 408 ) signal to experience a Reset ( 412 ) transition to the sample mode with the use of the Reset Control ( 306 ).
- the embodiment shown in FIG. 3 may utilize MOS technology components for a given data rate of transmission.
- Synchronization of the timing characteristics and delays as indicated by Equation 2 can be best achieved by including the Signal Sampler circuits of FIG. 3 in the same integrated circuit as the Driver ( 103 ). If a single integrated circuit is not available, then the Signal Sampler circuits must be implemented with the appropriate technology in order to match the speed requirements of the propagation delays associated with the laser Driver ( 103 ). Very fast Silicon Germanium and other technologies are available. In some applications, fine-tuning and modifications of the embodiment of FIG. 3 will be necessary to keep up with fast transmission rates. In these cases the same principles of the invention will apply and the task will consist of selecting the appropriate configuration of high-speed components.
- FIG. 4 shows the timing of the in line calibration of the laser optical power.
- the system clock that is utilized by the transponder. This is the clock CLK ( 400 ).
- the clock ( 400 ) is utilized in the system to generate Serial Data Di ( 401 ).
- the Serial Data Di ( 401 ) consists of the sequence 101 .
- the data transmission of the timing diagram in the illustration corresponds to NRZ-L.
- the Data flows through the Driver ( 103 ) and causes a zero to one transition in Laser Optical Power P L ( 403 ).
- This transition of the Laser Optical Power ( 403 ) happens after a delay t Drive ( 413 ), corresponding to the delay of the signal flowing through the Driver ( 103 ) and the Laser ( 106 ).
- a given setting of the Bias Current Generator ( 102 ) places the Laser ( 106 ) slightly above the threshold. This setting can be adjusted and controller controlled independently from the signal modulation current.
- For the purpose of calibrating the Light Output ( 107 ) focus on the control of the Modulation Current Generator ( 103 ).
- the magnitude of the optical power is noted as Pmax ( 404 ).
- the laser optical power corresponding to the transmission of a logical 1 will vary depending on the setting of the Modulation Current Generator ( 103 ), the Laser ( 106 ) characteristics and the effects of factors such as temperature and aging on the Laser ( 106 ).
- the Photodiode Sample Hold Response V PS ( 405 ) will start sensing the Laser ( 106 ) output after a delay of t sense ( 406 ).
- the Sample and Hold Amplifier ( 202 ) will start increasing its voltage in an exponential manner reaching a maximum value Vpeak ( 407 ). High frequency models have been determined that demonstrate how the combination of amplifiers and Photodiode Sensor ( 109 ) can respond with an exponential rise and decay characteristic.
- Associated circuit components such as resistors and capacitors can be utilized to ensure there is a dominant pole response resulting in a controlled exponential characteristic without signal ringing.
- the exponential rise and decay characteristic is illustrated here because it is fairly common for laser packages to be available with an integrated low-cost monitoring photodiode. These integrated packages normally have a monitoring photodiode that exhibits a slow frequency response.
- the Digital Controller ( 111 ) upon power up goes through an initialization process.
- Part of the initialization routine consists of a process used to optimize the sensor signal.
- the objective of the process is to maximize the value of Vpeak ( 407 ). Maximizing the value of Vpeak increases the resolution and accuracy of the laser power measurement system.
- the Digital Controller ( 111 ) will automatically select the timing delays one at a time and determine which produces the highest value of the Vpeak ( 407 ). This process can be carried out during the factory test of the transmitter. The needed value of the timing delay is then stored in the internal memory of the Digital Controller ( 111 ) so it can be used in the field. The process can also be carried out in the field with an addition to the circuit of FIG. 3 .
- the Controller ( 111 ) uses Switch Controls ( 502 , 503 ) to control the switches S 1 ( 500 ) and S 2 ( 501 ).
- Switch S 1 ( 500 ) is opened, the Drive Signal ( 100 ) is disconnected.
- the switch S 2 ( 501 ) can be closed. This allows the Controller ( 111 ) to place a train of pulses into the Driver ( 103 ) in order to calibrate the timing of the Output Signal Sampler and to calibrate the Extinction Ratio.
- this invention relies on correlating the photodiode sensor signal with the pattern of information transmitted over the optical communications link.
- the controller ( 111 ) can compute the correlation algorithms. Many algorithms that can accommodate multiple system responses are possible.
- One example of the correlation is as follows. Consider the exponential rise and decay of the Photodiode Sample Hold Response ( 405 ).
- the Digital Controller ( 111 ) can allow the charge stored in the capacitor C H ( 316 ) to decay to zero volts prior to sampling the Laser power output response.
- the response of the Signal Sampler in FIG. 3 will be governed by the following equations:
- V m represents the asymptotic maximum value of the exponential rise response
- R and C are the equivalent circuit constants
- V(t) is the voltage at the Sample and Hold Amplifier ( 202 ).
- V p represents the maximum value attained during the exponential rise response as determined by the circuit parameters and the data rate of transmission
- R and C are the equivalent circuit constants
- V(t) is the voltage at the Sample and Hold Amplifier ( 202 ).
- FIG. 6 shows the power measurement calibration. The following definitions apply:
- P PH1 ( 600 ) Laser power pulse received at the photodiode for a given setting of laser power output. This is proportional to the pulse of power that the laser emits in response to the logic one transmission.
- P PHMax1 ( 604 ) Maximum value of Laser power pulse received at the photodiode.
- the magnitude of the photodiode power is determined by the Driver ( 103 ), Laser ( 106 ) and the amount of light coupled from the laser to the photodiode.
- V 1 (t)( 601 ) Time dependent response of the photodiode ( 109 ) output, the Transimpedance Amplifier ( 301 ) and the Sample and Hold Amplifier ( 202 ). This response is the corresponding response to P PH1 ( 600 ).
- Vm 1 ( 606 ) Asymptotic value of the exponential response for V 1 (t)( 601 ). This is proportional to P PHMax1 ( 604 ). The proportionality constant is the Responsivity of the photodiode.
- Vpeak 1 ( 605 ) Peak value of exponential response corresponding to the end of the pulse for the transmission of a logic one.
- the laser will emit a pulse with a different level of power magnitude.
- P PH2 ( 602 ) Laser power pulse received at the photodiode for a second setting of laser power output.
- P PHMax2 ( 607 ) Maximum value of Laser power pulse received at the photodiode.
- V 2 (t)( 603 ) Time dependent response of the photodiode ( 109 ) output, the Transimpedance Amplifier ( 301 ) and the Sample and Hold Amplifier ( 202 ). This response is the corresponding response to P PH2 ( 602 ).
- Vm 2 ( 609 ) Asymptotic value of the exponential response for V 2 (t)( 603 ). This is proportional to P PHMax2 ( 607 ). The proportionality constant is the Responsivity of the photodiode.
- Vpeak 2 ( 608 ) Peak value of exponential response corresponding to the end of the pulse for the transmission of a logic one.
- Vpeak1 V m1 (1 ⁇ e ⁇ T1/R1C1 ) Equation 5.
- Vpeak2 V m2 (1 ⁇ e ⁇ T1/R1C1 ) Equation 6.
- equations 5 and 6 show how once the period and the circuit RC parameters are fixed, the quantity (1 ⁇ e ⁇ T1/R1C1 ) becomes a constant and the peak values of the exponential rise are dependent only on the asymptotic values of the photodiode response.
- the asymptotic values bear a linear relationship to the laser output power. In this case additional calibration processes need to be considered, which will control second order effects of the laser and photodiode transfer function such as temperature effects.
- Vpeak ( 407 ) of the exponential rise and decay of the photodiode sensing circuits will vary linearly would with respect to the maximum amplitude Pmax ( 404 ) of the Laser Optical Power Output ( 403 ).
- the amplitude of the sensor signal is first maximized.
- sequence Signal Sampler delays 312 to 313 . The delay that produces the strongest signal is chosen.
- While measuring power with optical power meter continuously adjust magnitude of laser power by controlling the Modulation Current Generator ( 103 ) until the maximum possible value of the laser power output is reached. The corresponding sensor output is measured and stored in the Digital Controller ( 111 ).
- the above calibration process can be modified for some applications if the process yield characteristics of the laser are understood. In that case, the sensor can still be calibrated but the process does not rely on the Optical Power Meter to determine how much power the laser puts out for all 1's and all 0's. Instead, process parameters can be used to coarsely determine the output power for a given setting of the Modulation Current Generator ( 103 ).
- the methods are related to ensuring the optimal value of extinction Ratio and minimal Bit Error Rate.
- the firmware imbedded in the Digital Controller ( 111 ) utilizes the results from the A/D conversion of the sensor and proceeds to make adjustments to the amplitude of the peak laser power in response to the logic high sent.
- the laser power for logic high needs to send a signal with a sufficiently large value according to the transmission protocol. With the precision power measurement circuit of this invention, the laser is not overdriven thus extending operating life.
- the Digital controller ( 111 ) makes adjustments to the minimal optical power in response to the logic low sent and.
- the minimal optical power is determined by the Bias Current Generator ( 102 ) and is adjusted above the threshold of the laser.
- the current needs to strike a balance between having too low of a value (needed to maximize extinction ratio) or too high of a value (needed to obtain a margin over the lasing threshold and to not operate over the noisy region of the laser near the threshold). Since the above adjustments are performed in a continuous manner, the laser is always operated at the optimal levels of power output.
Abstract
Description
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- An exponential rise and decay of the Photodiode Sensor (109) output is produced for a serial stream of the Drive Signal (100) comprised of all ones. For this data sequence, the average of the Photodiode Sensor (109) will exhibit the highest value;
- A Photodiode Sensor (109) output with an average value close to zero volts will be obtained for a serial stream of the Drive Signal (100) comprised of all zeros;
- The output of the Photodiode Sensor (109) will exhibit an average voltage value, which will between the maximum and minimum values described above depending on a generic sequence of date with mixed values of ones and zeros.
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- The digital input Drive Signal (100) is disconnected and a peak value of analog current from the Modulation Current Generator (103) is applied to the laser;
- The Light Output (107) is measured with an optical power meter.
- The Photodiode Sensor (109) generates a corresponding signal proportional to the light output;
- Adjustments are made in the Controller (111) in order to increase the magnitude of the optical power coming out of the laser to the desired level;
- The adjustments in the Controller (111) affect the Bias Current Generator (102) and Modulation Current Generator (103), which in turn affect the Light Output (107) of the Laser Module (106);
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- Produce a circuit to synthesize a high frequency calibration signal;
- Inject the calibration signal into the node between the Modulation Current Generator (103) and the laser module (106);
- Sense the calibration signal with the Photodiode Sensor (109);
- Add a special filter circuit between the photodiode sensor (109) and the Digital Controller (111);
- Detect the magnitude of the calibration signal with the Digital Controller (111).
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- An advantage of this invention is that laser power amplitude can be calibrated without interrupting the flow of information transmission.
- Another advantage of this invention is that the system can utilize multiple types of output responses from the Photodiode Sensor with the utilization of the appropriate correlation algorithm.
- Another advantage of this invention is that the transmitter optical power can be continuously maintained at the optimal value to achieve the target Extinction Ratio, Bit Error Rate and analog signal level.
- Another advantage of this invention is that the laser can be compensated for degradation due to aging.
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- t1=Buffer (314) input to output propagation delay
- t2=Selected propagation delay.
- t3=Digital Multiplexer (309) propagation delay.
- t4=Set input to Output propagation delay for Set Reset Latch (305).
- t5=Propagation delay from Sample and Hold Control S/H (408) input to the opening of the internal switch in the Sample and Hold Amplifier (202).
- tDrive (414)=Propagation delay across the Driver (103)+time for the Laser (106) to switch logic state
- tSense (406)=Time for the Photodiode Sensor (109) to respond+time for the Transimpedance Amplifier (301) to respond
- tCapture (414)=Time for the Sample and Hold Amplifier (202) to track the photodiode sensor signal.
tSynch(415)=t1+t2+t3+t4+t5 Equation 1.
tSynch(415)=tDrive(414)+tSense(406)+tCapture(414) Equation 2.
V(t)=Vm(1−e−t/RC) Equation 3.
V(t)Vpe−t/RC Equation 4.
Vpeak1=Vm1(1−e−T1/R1C1) Equation 5.
Vpeak2=Vm2(1−e−T1/R1C1) Equation 6.
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- 1. A circuit that precisely calibrates the laser optical power in a continuous manner without disrupting the flow of information in the optical communications link.
- 2. A method that utilizes knowledge of the measured value of the laser optical power and makes necessary adjustments to optimize the values of the Extinction Ratio and Bit Error Rate.
- 3. A circuit that can utilize any type of response from the sensing photodiode.
- 4. A method that utilizes knowledge of the information sent to the optical communications link to determine how the laser should be performing.
- 5. A circuit and method utilized to compensate for aging, temperature rise and other degradation effects of the laser without interrupting the flow of information transmitted.
- 6. A circuit and method that compensates for aging, temperature rise and other degradation effects of a laser only as needed at any point in time rather than at the beginning when power is turned on or at the factory.
- 7. A process that automatically maximizes the magnitude of the photodiode power sensor signal for a laser.
- 8. A circuit to capture a sense the laser output where the sensing is coordinated with the transmission signal.
- 9. A circuit as in 8, where the associated timing of the circuit is automatically optimized.
Claims (20)
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US13/048,743 USRE43685E1 (en) | 2002-01-08 | 2003-01-08 | Apparatus and method for measurement for dynamic laser signals |
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US10/513,091 Expired - Lifetime US7505498B2 (en) | 2002-01-08 | 2003-01-08 | Apparatus and method for measurement for dynamic laser signals |
US13/048,743 Expired - Lifetime USRE43685E1 (en) | 2002-01-08 | 2003-01-08 | Apparatus and method for measurement for dynamic laser signals |
US11/111,335 Abandoned US20050249252A1 (en) | 2003-01-08 | 2005-04-21 | Method and apparatus for digital signal processing enhanced laser performance compensation |
US12/364,482 Expired - Fee Related US7876797B2 (en) | 2003-01-08 | 2009-02-02 | Apparatus and method for measurement of dynamic laser signals |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140186056A1 (en) * | 2011-12-02 | 2014-07-03 | Semtech Corporation | Closed Loop Optical Modulation Amplitude Control |
Families Citing this family (50)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4312573B2 (en) * | 2003-10-27 | 2009-08-12 | 株式会社リコー | Semiconductor laser drive circuit |
JP4754170B2 (en) * | 2003-12-03 | 2011-08-24 | パナソニック株式会社 | Laser drive circuit and optical communication device |
US7333521B1 (en) * | 2003-12-04 | 2008-02-19 | National Semiconductor Corporation | Method of sensing VCSEL light output power by monitoring electrical characteristics of the VCSEL |
US20050191059A1 (en) * | 2004-01-12 | 2005-09-01 | Clariphy | Use of low-speed components in high-speed optical fiber transceivers |
TWI290640B (en) * | 2004-06-16 | 2007-12-01 | Mediatek Inc | Laser power controller and method for performing an auto power control |
US7447438B2 (en) * | 2004-07-02 | 2008-11-04 | Finisar Corporation | Calibration of digital diagnostics information in an optical transceiver prior to reporting to host |
US8639122B2 (en) * | 2004-07-02 | 2014-01-28 | Finisar Corporation | Filtering digital diagnostics information in an optical transceiver prior to reporting to host |
US7693491B2 (en) | 2004-11-30 | 2010-04-06 | Broadcom Corporation | Method and system for transmitter output power compensation |
US7634197B2 (en) * | 2005-01-12 | 2009-12-15 | Finisar Corporation | Compensation for temperature and voltage effects when monitoring parameters in a transceiver module |
US7630422B1 (en) | 2005-01-14 | 2009-12-08 | National Semiconductor Corporation | Driver for vertical-cavity surface-emitting laser and method |
US7369591B1 (en) * | 2005-01-14 | 2008-05-06 | National Semiconductor Corporation | System for controlling peaking for a driver for a vertical-cavity surface-emitting laser |
US8036539B2 (en) * | 2005-06-28 | 2011-10-11 | Finisar Corporation | Gigabit ethernet longwave optical transceiver module having amplified bias current |
GB2432037B (en) * | 2005-11-01 | 2011-04-20 | Agilent Technologies Inc | A method and system for stabilizing operation of laser sources |
US20080138080A1 (en) * | 2006-12-08 | 2008-06-12 | Alcatel Lucent | Controller detection |
EP2031744A1 (en) * | 2007-08-31 | 2009-03-04 | Bombardier Transportation GmbH | Power converter, in particular for railway traction vehicle |
JP2009200242A (en) * | 2008-02-21 | 2009-09-03 | Fujitsu Ltd | Optical transmitter, and control method |
US8447570B2 (en) * | 2008-05-21 | 2013-05-21 | Infineon Technologies Ag | Predictive sensor readout |
US9450696B2 (en) * | 2012-05-23 | 2016-09-20 | Vadum, Inc. | Photonic compressive sensing receiver |
JP5999179B2 (en) * | 2012-06-07 | 2016-09-28 | 富士通株式会社 | Photodetector, photodetection method, and optical transmitter |
US8923353B2 (en) * | 2012-10-26 | 2014-12-30 | Broadcom Corporation | Laser driver modulation and bias control scheme |
US9881250B2 (en) | 2013-06-07 | 2018-01-30 | Fisher Controls International Llc | Methods and apparatus for RFID communications in a process control system |
EP3016218A4 (en) * | 2013-07-15 | 2016-07-06 | Huawei Tech Co Ltd | Wavelength alignment method and device, and optical network system |
US9258056B2 (en) * | 2013-12-20 | 2016-02-09 | Juniper Networks, Inc. | Methods and apparatus for monitoring and controlling the performance of optical communication systems |
US9432121B2 (en) * | 2014-06-05 | 2016-08-30 | Xilinx, Inc. | Optical communication circuits |
US10303134B2 (en) | 2015-04-10 | 2019-05-28 | Fisher Controls International Llc | Methods and apparatus for multimode RFST communications in process control systems |
US10177841B2 (en) * | 2016-03-31 | 2019-01-08 | Mellanox Technologies, Ltd. | Electro-optic transceiver module with wavelength compensation |
US20170288369A1 (en) * | 2016-04-01 | 2017-10-05 | Macom Technology Solutions Holdings, Inc. | Dual closed loop for laser power control |
GB2541291B (en) * | 2016-07-08 | 2018-06-20 | Hilight Semiconductor Ltd | Laser power controller |
US9806807B1 (en) * | 2016-07-12 | 2017-10-31 | Adtran, Inc. | Automatic rogue ONU detection |
US10263384B2 (en) * | 2016-10-14 | 2019-04-16 | Lumenis Ltd. | Laser system having a dual pulse-length regime |
US10481246B2 (en) * | 2017-05-22 | 2019-11-19 | Analog Devices Global Unlimited Company | Photo-diode emulator circuit for transimpedance amplifier testing |
US11848653B2 (en) | 2018-05-18 | 2023-12-19 | Macom Technology Solutions Holdings, Inc. | Method and apparatus to speed convergence and control behavior of digital control loop |
US10938365B2 (en) | 2018-05-18 | 2021-03-02 | Macom Technology Solutions Holdings, Inc. | Variable step size to reduce convergence time of a control loop |
US11067672B2 (en) | 2018-06-19 | 2021-07-20 | Waymo Llc | Shared sample and convert capacitor architecture |
US11005573B2 (en) | 2018-11-20 | 2021-05-11 | Macom Technology Solutions Holdings, Inc. | Optic signal receiver with dynamic control |
EP3683906A1 (en) * | 2019-01-15 | 2020-07-22 | ams AG | Temperature sensor, laser circuit, light detection and ranging system and method |
CN114616804A (en) | 2019-09-19 | 2022-06-10 | Macom技术解决方案控股公司 | Adjusting equalizer settings using ISI or Q calculations |
FR3101218B1 (en) | 2019-09-23 | 2022-07-01 | Macom Tech Solutions Holdings Inc | EQUALIZER ADAPTATION BASED ON EYE MONITORING DEVICE MEASUREMENTS |
WO2021076800A1 (en) | 2019-10-15 | 2021-04-22 | Macom Technology Solutions Holdings, Inc. | Finding the eye center with a low-power eye monitor using a 3-dimensional algorithm |
CN110954771A (en) * | 2019-12-17 | 2020-04-03 | 武汉英飞光创科技有限公司 | Aging method for COC (chip on chip) of optical module |
US11575437B2 (en) | 2020-01-10 | 2023-02-07 | Macom Technology Solutions Holdings, Inc. | Optimal equalization partitioning |
EP4088394A4 (en) | 2020-01-10 | 2024-02-07 | Macom Tech Solutions Holdings Inc | Optimal equalization partitioning |
US11689283B1 (en) * | 2020-03-30 | 2023-06-27 | Meta Platforms, Inc. | Free-space optical communication system using a backchannel for power optimization |
US11658630B2 (en) | 2020-12-04 | 2023-05-23 | Macom Technology Solutions Holdings, Inc. | Single servo loop controlling an automatic gain control and current sourcing mechanism |
US11616529B2 (en) | 2021-02-12 | 2023-03-28 | Macom Technology Solutions Holdings, Inc. | Adaptive cable equalizer |
US11923896B2 (en) * | 2021-03-24 | 2024-03-05 | Tektronix, Inc. | Optical transceiver tuning using machine learning |
US11923895B2 (en) | 2021-03-24 | 2024-03-05 | Tektronix, Inc. | Optical transmitter tuning using machine learning and reference parameters |
US11907090B2 (en) | 2021-08-12 | 2024-02-20 | Tektronix, Inc. | Machine learning for taps to accelerate TDECQ and other measurements |
US11940889B2 (en) | 2021-08-12 | 2024-03-26 | Tektronix, Inc. | Combined TDECQ measurement and transmitter tuning using machine learning |
CN114498293B (en) * | 2022-03-30 | 2022-07-19 | 成都明夷电子科技有限公司 | Optical module adjusting method with temperature compensation |
Citations (110)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3346811A (en) | 1964-02-24 | 1967-10-10 | Allis Chalmers Mfg Co | Means for sensing conditions in high potential region and for transmitting such intelligence by light means to low potential regions |
US4000397A (en) | 1975-03-21 | 1976-12-28 | Spectra-Physics, Inc. | Signal processor method and apparatus |
US4164036A (en) | 1977-12-07 | 1979-08-07 | Honeywell Inc. | Quadrature correlation phase reversal pulse detector |
US4168398A (en) | 1976-11-10 | 1979-09-18 | Nippon Electric Co., Ltd. | Initial acquisition signal detection system for TDMA satellite communication |
US4290146A (en) | 1978-09-22 | 1981-09-15 | Asea Aktiebolag | Measuring device for transmitting measuring signals via an optical link |
US4290297A (en) | 1979-05-14 | 1981-09-22 | Rousemount Inc. | Optically coupled calibrator for transmitters |
US4471494A (en) | 1981-09-21 | 1984-09-11 | Siemens Aktiengesellschaft | Optical transmission system for high frequency digital signals |
US4553268A (en) | 1980-04-08 | 1985-11-12 | Siemens Aktiengesellschaft | Circuit arrangement with a laser diode for transmission of communication signals through a light waveguide |
US4558465A (en) | 1983-09-19 | 1985-12-10 | Rca Corporation | Switched bias scheme for high speed laser transmitter |
US4677536A (en) | 1986-03-17 | 1987-06-30 | Tektronix, Inc. | AC Current sensing circuit |
GB2192510A (en) | 1986-07-12 | 1988-01-13 | Stc Plc | Optical receiver |
US4734873A (en) | 1984-02-02 | 1988-03-29 | Honeywell Inc. | Method of digital process variable transmitter calibration and a process variable transmitter system utilizing the same |
US4745361A (en) | 1987-03-03 | 1988-05-17 | University Of Rochester | Electro-optic measurement (network analysis) system |
US4758779A (en) | 1986-04-07 | 1988-07-19 | Tektronix, Inc. | Probe body for an electrical measurement system |
US4796266A (en) | 1987-12-21 | 1989-01-03 | Bell Communications Research, Inc. | Laser driver circuit with dynamic bias |
US4875006A (en) | 1988-09-01 | 1989-10-17 | Photon Dynamics, Inc. | Ultra-high-speed digital test system using electro-optic signal sampling |
US4910458A (en) | 1987-03-24 | 1990-03-20 | Princeton Applied Research Corp. | Electro-optic sampling system with dedicated electro-optic crystal and removable sample carrier |
US4939446A (en) | 1988-03-30 | 1990-07-03 | Rogers Wesley A | Voltage transmission link for testing EMI susceptibility of a device or circuits |
US4942534A (en) | 1987-12-08 | 1990-07-17 | Nissan Motor Company, Limited | Signal-transmission type production supervising system including IC card and wireless type interface unit |
US4994675A (en) | 1989-04-28 | 1991-02-19 | Rebo Research, Inc. | Method and apparatus for checking continuity of optic transmission |
US4995105A (en) | 1989-09-18 | 1991-02-19 | Xerox Corporation | Adaptive laser diode driver circuit for laser scanners |
US4996478A (en) | 1990-01-05 | 1991-02-26 | Tektronix, Inc. | Apparatus for connecting an IC device to a test system |
US5019769A (en) | 1990-09-14 | 1991-05-28 | Finisar Corporation | Semiconductor laser diode controller and laser diode biasing control method |
US5021647A (en) | 1987-09-30 | 1991-06-04 | Kabushiki Kaisha Toshiba | Optical fiber sensor having function of compensating for all drifting components |
DE4028966A1 (en) | 1990-09-12 | 1992-03-19 | Rudolf Dr Goedecke | Data processor integrated circuit memory card interface module - has terminal type(s) allowing transfer of analogue or digital signals |
US5103453A (en) | 1991-02-12 | 1992-04-07 | Aerodyne Research, Inc. | Method and means for controlling the frequency and power output of a tunable diode laser |
US5107202A (en) | 1989-10-23 | 1992-04-21 | Trustees Of Princeton University | Fiber optic current monitor for high-voltage applications |
US5113131A (en) | 1990-02-16 | 1992-05-12 | Southern California Edison Company | Voltage measuring device having electro-optic sensor and compensator |
US5136237A (en) | 1991-01-29 | 1992-08-04 | Tektronix, Inc. | Double insulated floating high voltage test probe |
US5153765A (en) | 1988-05-26 | 1992-10-06 | U.S. Philips Corp. | Optical transmitter comprising a laser diode |
US5164662A (en) | 1991-07-22 | 1992-11-17 | Westinghouse Electric Corp. | Detection of radio frequency emissions |
US5181026A (en) | 1990-01-12 | 1993-01-19 | Granville Group, Inc., The | Power transmission line monitoring system |
US5197778A (en) | 1991-03-02 | 1993-03-30 | Dr. Ing. H.C.F. Porsche Ag | Vehicle folding top |
DE9303877U1 (en) | 1993-03-18 | 1993-05-19 | Schulten, Thomas, 4600 Dortmund, De | |
EP0344091B1 (en) | 1988-05-26 | 1993-11-03 | KRONE Aktiengesellschaft | Receiving preamplifier for an optical information transmission link |
US5268916A (en) | 1992-06-15 | 1993-12-07 | Alcatel Network Systems, Inc. | Laser bias and modulation circuit |
US5267769A (en) | 1991-07-16 | 1993-12-07 | Mercedes-Benz Ag | Manually operable folding top for vehicles using automatic-ejection snap-action closures |
US5272434A (en) | 1987-06-20 | 1993-12-21 | Schlumberger Technologies, Inc. | Method and apparatus for electro-optically testing circuits |
US5311116A (en) | 1992-04-02 | 1994-05-10 | Electronic Development, Inc. | Multi-channel electromagnetically transparent voltage waveform monitor link |
US5334826A (en) | 1991-05-10 | 1994-08-02 | Fujitsu Limited | Method and apparatus for extending and confirming the service life of semiconductor laser of bar code reader by detecting current increase corresponding to temperature of semiconductor laser |
US5410145A (en) | 1994-02-25 | 1995-04-25 | Coroy; Trenton G. | Light detector using reverse biased photodiodes with dark current compensation |
US5414345A (en) | 1991-04-29 | 1995-05-09 | Electronic Development, Inc. | Apparatus and method for low cost electromagnetic field susceptibility testing |
US5463461A (en) | 1991-03-06 | 1995-10-31 | Kokusai Denshin Denwa Company, Ltd. | Coherent optical receiver having optically amplified local oscillator signal |
DE29514423U1 (en) | 1995-09-08 | 1995-11-02 | Langer Gunter Dipl Ing | EMC compact sensor |
US5500517A (en) | 1994-09-02 | 1996-03-19 | Gemplus Card International | Apparatus and method for data transfer between stand alone integrated circuit smart card terminal and remote computer of system operator |
US5502298A (en) | 1992-12-21 | 1996-03-26 | Ericsson Raynet | Apparatus and method for controlling an extinction ratio of a laser diode over temperature |
US5514864A (en) | 1994-03-25 | 1996-05-07 | Umax Data System Inc. | Photo electric feedback compensation controlled apparatus |
US5526164A (en) | 1993-05-19 | 1996-06-11 | U.S. Philips Corporation | Optical transmission system comprising a laser diode |
US5558389A (en) | 1993-08-07 | 1996-09-24 | Wilhelm Karmann Gmbh | Retractable folding top for a convertible |
US5574273A (en) | 1993-06-14 | 1996-11-12 | Hitachi Maxell, Ltd. | Non-contact system parallel data transfer system |
US5574270A (en) | 1989-10-20 | 1996-11-12 | Sgs-Thomson Microelectronics, S.A. | Chip card system provided with an offset electronic circuit |
US5579328A (en) | 1995-08-10 | 1996-11-26 | Northern Telecom Limited | Digital control of laser diode power levels |
US5583444A (en) | 1993-01-27 | 1996-12-10 | Hamamatsu Photonics K.K. | Voltage detection apparatus |
EP0759666A2 (en) | 1995-08-10 | 1997-02-26 | Fujitsu Limited | Optical telecommunication module |
US5625616A (en) | 1995-04-05 | 1997-04-29 | Sony Corporation | Deterioration estimating method for a light emitting device and a light emission driving apparatus using the method |
US5680056A (en) | 1993-09-20 | 1997-10-21 | Fujitsu Limited | Apparatus and method for testing circuit board |
US5706116A (en) | 1995-12-26 | 1998-01-06 | Fujitsu Limited | Drive circuit optical modulator and optical transmitter |
US5721579A (en) | 1993-12-22 | 1998-02-24 | Canon Kabushiki Kaisha | Light intensity controlling apparatus and image forming apparatus therewith |
US5724170A (en) | 1994-12-15 | 1998-03-03 | Nec Corporation | Automatic power control circuit |
DE19507809C2 (en) | 1995-03-06 | 1998-05-20 | Gunter Dipl Ing Langer | Measuring method for the detection of pulse-shaped disturbances |
US5774669A (en) | 1995-07-28 | 1998-06-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Scalable hierarchical network management system for displaying network information in three dimensions |
US5812572A (en) | 1996-07-01 | 1998-09-22 | Pacific Fiberoptics, Inc. | Intelligent fiberoptic transmitters and methods of operating and manufacturing the same |
US5816644A (en) | 1995-06-22 | 1998-10-06 | Wilhelm Karmann Gmbh | Folding top for a convertible |
US5844928A (en) | 1996-02-27 | 1998-12-01 | Lucent Technologies, Inc. | Laser driver with temperature sensor on an integrated circuit |
US5850370A (en) | 1989-09-01 | 1998-12-15 | Quantronix, Inc. | Laser-based dimensioning system |
US5875296A (en) | 1997-01-28 | 1999-02-23 | International Business Machines Corporation | Distributed file system web server user authentication with cookies |
US5889802A (en) | 1994-10-22 | 1999-03-30 | Hewlett-Packard Company | Bias controller and method |
US5949606A (en) | 1996-03-13 | 1999-09-07 | Deutsche Thomson-Brandt Gmbh | Detection circuit for pilot tones for tracking control in the case of magnetic-tape recordings |
US5967593A (en) | 1996-09-12 | 1999-10-19 | Daimlerchrysler Ag | Panel cover for a forward area of the frame opening of a top storage compartment |
US5975619A (en) | 1996-09-04 | 1999-11-02 | Daimlerchrysler Ag | Folding top for vehicles |
US5982794A (en) | 1996-12-18 | 1999-11-09 | Ando Electric Co., Ltd. | External resonator type of variable-wavelength semiconductor laser light source |
US6002099A (en) | 1997-04-23 | 1999-12-14 | Technolines, Llc | User control interface for laser simulating sandblasting apparatus |
USRE36491E (en) | 1995-07-27 | 2000-01-11 | Methode Electronics, Inc. | Optoelectronic transceiver module laser diode stabilizer and bias control method |
US6028423A (en) | 1997-12-11 | 2000-02-22 | Sanchez; Jorge | Isolation instrument for electrical testing |
US6049828A (en) | 1990-09-17 | 2000-04-11 | Cabletron Systems, Inc. | Method and apparatus for monitoring the status of non-pollable devices in a computer network |
US6055252A (en) | 1998-09-10 | 2000-04-25 | Photonic Solutions, Inc. | Fiberoptic transmitter using thermistor to maintain stable operating conditions over a range of temperature |
US6057678A (en) | 1997-11-28 | 2000-05-02 | Matsushita Electric Industrial Co., Ltd. | Optical sensor apparatus and signal processing circuit used therein including initialization and measuring modes |
US6145743A (en) | 1995-06-19 | 2000-11-14 | Symbol Technologies, Inc. | Light collection systems in electro-optical readers |
US6157950A (en) | 1997-12-05 | 2000-12-05 | Encanto Networks, Inc. | Methods and apparatus for interfacing a computer or small network to a wide area network such as the internet |
DE19959700C1 (en) | 1999-12-10 | 2001-02-22 | Daimler Chrysler Ag | Displacement drive for cabriolet vehicle rear cover has locking elements for rear cover fixing hinge controlled by relatively sliding elements of each drive unit |
US6270728B1 (en) | 1996-08-01 | 2001-08-07 | Micronic B.V. | Test tube with optically readable coding |
US6276605B1 (en) | 1995-08-25 | 2001-08-21 | Psc, Inc. | Optical reader with condensed CMOS circuitry |
US6282218B1 (en) | 1997-01-09 | 2001-08-28 | Cymer, Inc. | Control circuit with automatic DC offset |
US20010024459A1 (en) * | 2000-03-24 | 2001-09-27 | Seo Jin-Gyo | Apparatus for and method of controlling auto laser diode power |
US6364396B1 (en) | 1999-10-19 | 2002-04-02 | Aisin Seiki Kabushiki Kaisha | Package tray for vehicle |
US6370175B1 (en) | 1998-04-13 | 2002-04-09 | Fuji Xerox Co., Ltd. | Laser beam luminous energy correction method, laser driving apparatus, laser beam scanner and image recording device |
US6377987B1 (en) | 1999-04-30 | 2002-04-23 | Cisco Technology, Inc. | Mechanism for determining actual physical topology of network based on gathered configuration information representing true neighboring devices |
US6384590B1 (en) | 1998-11-11 | 2002-05-07 | Ando Electric Co., Ltd. | Light receiving circuit for use in electro-optic sampling oscilloscope |
US6396062B1 (en) | 1999-12-03 | 2002-05-28 | Cymer, Inc. | Portable laser beam monitor |
US6414974B1 (en) | 1999-09-07 | 2002-07-02 | Analog Devices, Inc. | Method and a control circuit for controlling the extinction ratio of a laser diode |
US20020105982A1 (en) | 2000-12-12 | 2002-08-08 | Jesse Chin | Open-loop laser driver having an integrated digital controller |
US6454343B1 (en) | 2000-10-10 | 2002-09-24 | Cts Fahrzeug-Dachsysteme Gmbh | Multi-part cover for vehicles |
US6454342B2 (en) | 2000-06-15 | 2002-09-24 | Wilhelm Karmann Gmbh | Convertible vehicle |
US20020175287A1 (en) | 2001-03-08 | 2002-11-28 | Busch Kenneth W. | Dispersive near-infrared spectrometer with automatic wavelength calibration |
US6490302B1 (en) | 1999-10-28 | 2002-12-03 | Matsushita Electric Industrial Co., Ltd. | Semiconductor laser control circuit and laser light source |
US6502891B2 (en) | 2000-05-02 | 2003-01-07 | Wilhelm Karmann Gmbh | Convertible vehicle |
DE19912893C2 (en) | 1999-03-23 | 2003-02-27 | Daimler Chrysler Ag | Convertible vehicle with a hood |
US20030066947A1 (en) | 2000-10-13 | 2003-04-10 | Jim Alwan | Attenuation and calibration systems and methods for use with a laser detector in an optical communication system |
US6574662B2 (en) | 1998-03-12 | 2003-06-03 | Canon Kabushiki Kaisha | System for network-device management including collecting and storing of device attributes that change with time and device attributes that hardly change with time |
US6574737B1 (en) | 1998-12-23 | 2003-06-03 | Symantec Corporation | System for penetrating computer or computer network |
US6580531B1 (en) | 1999-12-30 | 2003-06-17 | Sycamore Networks, Inc. | Method and apparatus for in circuit biasing and testing of a modulated laser and optical receiver in a wavelength division multiplexing optical transceiver board |
US20040136423A1 (en) | 2001-05-15 | 2004-07-15 | Coldren Larry A | Sampled grating distributed bragg reflector laser controller |
US20040197101A1 (en) | 2001-02-05 | 2004-10-07 | Sasser Gary D. | Optical transceiver module with host accessible on-board diagnostics |
US20040196754A1 (en) | 2001-02-26 | 2004-10-07 | Akira Mashimo | Optical disk device |
US20050030744A1 (en) | 1999-11-18 | 2005-02-10 | Color Kinetics, Incorporated | Methods and apparatus for generating and modulating illumination conditions |
US6907055B2 (en) | 2001-11-13 | 2005-06-14 | Analog Devices, Inc. | Method and circuit for measuring the optical modulation amplitude (OMA) in the operating region of a laser diode |
US20070069155A1 (en) | 2005-09-28 | 2007-03-29 | Mirro Eugene Jr | Beam re-registration system and method |
US7381935B2 (en) | 2004-11-19 | 2008-06-03 | Mindspeed Technologies, Inc. | Laser power control with automatic power compensation |
US7421308B2 (en) | 2000-09-21 | 2008-09-02 | Gsi Group Corporation | Digital control servo system |
US7608806B2 (en) | 2004-11-19 | 2009-10-27 | Mindspeed Technologies, Inc. | Multiple parameter laser power control with automatic compensation |
-
2003
- 2003-01-08 US US10/513,091 patent/US7505498B2/en not_active Expired - Lifetime
- 2003-01-08 WO PCT/US2003/000463 patent/WO2004064210A1/en not_active Application Discontinuation
- 2003-01-08 CA CA002475850A patent/CA2475850A1/en not_active Abandoned
- 2003-01-08 DE DE60326457T patent/DE60326457D1/en not_active Expired - Lifetime
- 2003-01-08 AU AU2003202238A patent/AU2003202238A1/en not_active Abandoned
- 2003-01-08 EP EP03701250A patent/EP1529327B1/en not_active Expired - Lifetime
- 2003-01-08 AT AT03701250T patent/ATE424640T1/en not_active IP Right Cessation
- 2003-01-08 US US13/048,743 patent/USRE43685E1/en not_active Expired - Lifetime
-
2005
- 2005-04-21 US US11/111,335 patent/US20050249252A1/en not_active Abandoned
-
2009
- 2009-02-02 US US12/364,482 patent/US7876797B2/en not_active Expired - Fee Related
Patent Citations (111)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3346811A (en) | 1964-02-24 | 1967-10-10 | Allis Chalmers Mfg Co | Means for sensing conditions in high potential region and for transmitting such intelligence by light means to low potential regions |
US4000397A (en) | 1975-03-21 | 1976-12-28 | Spectra-Physics, Inc. | Signal processor method and apparatus |
US4168398A (en) | 1976-11-10 | 1979-09-18 | Nippon Electric Co., Ltd. | Initial acquisition signal detection system for TDMA satellite communication |
US4164036A (en) | 1977-12-07 | 1979-08-07 | Honeywell Inc. | Quadrature correlation phase reversal pulse detector |
US4290146A (en) | 1978-09-22 | 1981-09-15 | Asea Aktiebolag | Measuring device for transmitting measuring signals via an optical link |
US4290297A (en) | 1979-05-14 | 1981-09-22 | Rousemount Inc. | Optically coupled calibrator for transmitters |
US4553268A (en) | 1980-04-08 | 1985-11-12 | Siemens Aktiengesellschaft | Circuit arrangement with a laser diode for transmission of communication signals through a light waveguide |
US4471494A (en) | 1981-09-21 | 1984-09-11 | Siemens Aktiengesellschaft | Optical transmission system for high frequency digital signals |
US4558465A (en) | 1983-09-19 | 1985-12-10 | Rca Corporation | Switched bias scheme for high speed laser transmitter |
US4734873A (en) | 1984-02-02 | 1988-03-29 | Honeywell Inc. | Method of digital process variable transmitter calibration and a process variable transmitter system utilizing the same |
US4677536A (en) | 1986-03-17 | 1987-06-30 | Tektronix, Inc. | AC Current sensing circuit |
US4758779A (en) | 1986-04-07 | 1988-07-19 | Tektronix, Inc. | Probe body for an electrical measurement system |
GB2192510A (en) | 1986-07-12 | 1988-01-13 | Stc Plc | Optical receiver |
US4745361A (en) | 1987-03-03 | 1988-05-17 | University Of Rochester | Electro-optic measurement (network analysis) system |
US4910458A (en) | 1987-03-24 | 1990-03-20 | Princeton Applied Research Corp. | Electro-optic sampling system with dedicated electro-optic crystal and removable sample carrier |
US5272434A (en) | 1987-06-20 | 1993-12-21 | Schlumberger Technologies, Inc. | Method and apparatus for electro-optically testing circuits |
US5021647A (en) | 1987-09-30 | 1991-06-04 | Kabushiki Kaisha Toshiba | Optical fiber sensor having function of compensating for all drifting components |
US4942534A (en) | 1987-12-08 | 1990-07-17 | Nissan Motor Company, Limited | Signal-transmission type production supervising system including IC card and wireless type interface unit |
US4796266A (en) | 1987-12-21 | 1989-01-03 | Bell Communications Research, Inc. | Laser driver circuit with dynamic bias |
US4939446A (en) | 1988-03-30 | 1990-07-03 | Rogers Wesley A | Voltage transmission link for testing EMI susceptibility of a device or circuits |
EP0344091B1 (en) | 1988-05-26 | 1993-11-03 | KRONE Aktiengesellschaft | Receiving preamplifier for an optical information transmission link |
US5153765A (en) | 1988-05-26 | 1992-10-06 | U.S. Philips Corp. | Optical transmitter comprising a laser diode |
US4875006A (en) | 1988-09-01 | 1989-10-17 | Photon Dynamics, Inc. | Ultra-high-speed digital test system using electro-optic signal sampling |
US4994675A (en) | 1989-04-28 | 1991-02-19 | Rebo Research, Inc. | Method and apparatus for checking continuity of optic transmission |
US5850370A (en) | 1989-09-01 | 1998-12-15 | Quantronix, Inc. | Laser-based dimensioning system |
US4995105A (en) | 1989-09-18 | 1991-02-19 | Xerox Corporation | Adaptive laser diode driver circuit for laser scanners |
US5574270A (en) | 1989-10-20 | 1996-11-12 | Sgs-Thomson Microelectronics, S.A. | Chip card system provided with an offset electronic circuit |
US5107202A (en) | 1989-10-23 | 1992-04-21 | Trustees Of Princeton University | Fiber optic current monitor for high-voltage applications |
US4996478A (en) | 1990-01-05 | 1991-02-26 | Tektronix, Inc. | Apparatus for connecting an IC device to a test system |
US5181026A (en) | 1990-01-12 | 1993-01-19 | Granville Group, Inc., The | Power transmission line monitoring system |
US5113131A (en) | 1990-02-16 | 1992-05-12 | Southern California Edison Company | Voltage measuring device having electro-optic sensor and compensator |
DE4028966A1 (en) | 1990-09-12 | 1992-03-19 | Rudolf Dr Goedecke | Data processor integrated circuit memory card interface module - has terminal type(s) allowing transfer of analogue or digital signals |
US5019769A (en) | 1990-09-14 | 1991-05-28 | Finisar Corporation | Semiconductor laser diode controller and laser diode biasing control method |
US6049828A (en) | 1990-09-17 | 2000-04-11 | Cabletron Systems, Inc. | Method and apparatus for monitoring the status of non-pollable devices in a computer network |
US5136237A (en) | 1991-01-29 | 1992-08-04 | Tektronix, Inc. | Double insulated floating high voltage test probe |
US5103453A (en) | 1991-02-12 | 1992-04-07 | Aerodyne Research, Inc. | Method and means for controlling the frequency and power output of a tunable diode laser |
US5197778A (en) | 1991-03-02 | 1993-03-30 | Dr. Ing. H.C.F. Porsche Ag | Vehicle folding top |
US5463461A (en) | 1991-03-06 | 1995-10-31 | Kokusai Denshin Denwa Company, Ltd. | Coherent optical receiver having optically amplified local oscillator signal |
US5414345A (en) | 1991-04-29 | 1995-05-09 | Electronic Development, Inc. | Apparatus and method for low cost electromagnetic field susceptibility testing |
US5334826A (en) | 1991-05-10 | 1994-08-02 | Fujitsu Limited | Method and apparatus for extending and confirming the service life of semiconductor laser of bar code reader by detecting current increase corresponding to temperature of semiconductor laser |
US5267769A (en) | 1991-07-16 | 1993-12-07 | Mercedes-Benz Ag | Manually operable folding top for vehicles using automatic-ejection snap-action closures |
US5164662A (en) | 1991-07-22 | 1992-11-17 | Westinghouse Electric Corp. | Detection of radio frequency emissions |
US5311116A (en) | 1992-04-02 | 1994-05-10 | Electronic Development, Inc. | Multi-channel electromagnetically transparent voltage waveform monitor link |
US5268916A (en) | 1992-06-15 | 1993-12-07 | Alcatel Network Systems, Inc. | Laser bias and modulation circuit |
US5502298A (en) | 1992-12-21 | 1996-03-26 | Ericsson Raynet | Apparatus and method for controlling an extinction ratio of a laser diode over temperature |
US5583444A (en) | 1993-01-27 | 1996-12-10 | Hamamatsu Photonics K.K. | Voltage detection apparatus |
DE9303877U1 (en) | 1993-03-18 | 1993-05-19 | Schulten, Thomas, 4600 Dortmund, De | |
US5526164A (en) | 1993-05-19 | 1996-06-11 | U.S. Philips Corporation | Optical transmission system comprising a laser diode |
US5574273A (en) | 1993-06-14 | 1996-11-12 | Hitachi Maxell, Ltd. | Non-contact system parallel data transfer system |
US5558389A (en) | 1993-08-07 | 1996-09-24 | Wilhelm Karmann Gmbh | Retractable folding top for a convertible |
EP0638453B1 (en) | 1993-08-07 | 1996-10-23 | Wilhelm Karmann GmbH | Stowable soft top for convertible vehicle |
US5680056A (en) | 1993-09-20 | 1997-10-21 | Fujitsu Limited | Apparatus and method for testing circuit board |
US5721579A (en) | 1993-12-22 | 1998-02-24 | Canon Kabushiki Kaisha | Light intensity controlling apparatus and image forming apparatus therewith |
US5410145A (en) | 1994-02-25 | 1995-04-25 | Coroy; Trenton G. | Light detector using reverse biased photodiodes with dark current compensation |
US5514864A (en) | 1994-03-25 | 1996-05-07 | Umax Data System Inc. | Photo electric feedback compensation controlled apparatus |
US5500517A (en) | 1994-09-02 | 1996-03-19 | Gemplus Card International | Apparatus and method for data transfer between stand alone integrated circuit smart card terminal and remote computer of system operator |
US5889802A (en) | 1994-10-22 | 1999-03-30 | Hewlett-Packard Company | Bias controller and method |
US5724170A (en) | 1994-12-15 | 1998-03-03 | Nec Corporation | Automatic power control circuit |
DE19507809C2 (en) | 1995-03-06 | 1998-05-20 | Gunter Dipl Ing Langer | Measuring method for the detection of pulse-shaped disturbances |
US5625616A (en) | 1995-04-05 | 1997-04-29 | Sony Corporation | Deterioration estimating method for a light emitting device and a light emission driving apparatus using the method |
US6145743A (en) | 1995-06-19 | 2000-11-14 | Symbol Technologies, Inc. | Light collection systems in electro-optical readers |
US5816644A (en) | 1995-06-22 | 1998-10-06 | Wilhelm Karmann Gmbh | Folding top for a convertible |
USRE36491E (en) | 1995-07-27 | 2000-01-11 | Methode Electronics, Inc. | Optoelectronic transceiver module laser diode stabilizer and bias control method |
US5774669A (en) | 1995-07-28 | 1998-06-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Scalable hierarchical network management system for displaying network information in three dimensions |
EP0759666A2 (en) | 1995-08-10 | 1997-02-26 | Fujitsu Limited | Optical telecommunication module |
US5579328A (en) | 1995-08-10 | 1996-11-26 | Northern Telecom Limited | Digital control of laser diode power levels |
US6276605B1 (en) | 1995-08-25 | 2001-08-21 | Psc, Inc. | Optical reader with condensed CMOS circuitry |
DE29514423U1 (en) | 1995-09-08 | 1995-11-02 | Langer Gunter Dipl Ing | EMC compact sensor |
US5706116A (en) | 1995-12-26 | 1998-01-06 | Fujitsu Limited | Drive circuit optical modulator and optical transmitter |
US5844928A (en) | 1996-02-27 | 1998-12-01 | Lucent Technologies, Inc. | Laser driver with temperature sensor on an integrated circuit |
US5949606A (en) | 1996-03-13 | 1999-09-07 | Deutsche Thomson-Brandt Gmbh | Detection circuit for pilot tones for tracking control in the case of magnetic-tape recordings |
US5812572A (en) | 1996-07-01 | 1998-09-22 | Pacific Fiberoptics, Inc. | Intelligent fiberoptic transmitters and methods of operating and manufacturing the same |
US6270728B1 (en) | 1996-08-01 | 2001-08-07 | Micronic B.V. | Test tube with optically readable coding |
US5975619A (en) | 1996-09-04 | 1999-11-02 | Daimlerchrysler Ag | Folding top for vehicles |
US5967593A (en) | 1996-09-12 | 1999-10-19 | Daimlerchrysler Ag | Panel cover for a forward area of the frame opening of a top storage compartment |
US5982794A (en) | 1996-12-18 | 1999-11-09 | Ando Electric Co., Ltd. | External resonator type of variable-wavelength semiconductor laser light source |
US6282218B1 (en) | 1997-01-09 | 2001-08-28 | Cymer, Inc. | Control circuit with automatic DC offset |
US5875296A (en) | 1997-01-28 | 1999-02-23 | International Business Machines Corporation | Distributed file system web server user authentication with cookies |
US6002099A (en) | 1997-04-23 | 1999-12-14 | Technolines, Llc | User control interface for laser simulating sandblasting apparatus |
US6057678A (en) | 1997-11-28 | 2000-05-02 | Matsushita Electric Industrial Co., Ltd. | Optical sensor apparatus and signal processing circuit used therein including initialization and measuring modes |
US6157950A (en) | 1997-12-05 | 2000-12-05 | Encanto Networks, Inc. | Methods and apparatus for interfacing a computer or small network to a wide area network such as the internet |
US6028423A (en) | 1997-12-11 | 2000-02-22 | Sanchez; Jorge | Isolation instrument for electrical testing |
US6574662B2 (en) | 1998-03-12 | 2003-06-03 | Canon Kabushiki Kaisha | System for network-device management including collecting and storing of device attributes that change with time and device attributes that hardly change with time |
US6370175B1 (en) | 1998-04-13 | 2002-04-09 | Fuji Xerox Co., Ltd. | Laser beam luminous energy correction method, laser driving apparatus, laser beam scanner and image recording device |
US6055252A (en) | 1998-09-10 | 2000-04-25 | Photonic Solutions, Inc. | Fiberoptic transmitter using thermistor to maintain stable operating conditions over a range of temperature |
US6384590B1 (en) | 1998-11-11 | 2002-05-07 | Ando Electric Co., Ltd. | Light receiving circuit for use in electro-optic sampling oscilloscope |
US6574737B1 (en) | 1998-12-23 | 2003-06-03 | Symantec Corporation | System for penetrating computer or computer network |
DE19912893C2 (en) | 1999-03-23 | 2003-02-27 | Daimler Chrysler Ag | Convertible vehicle with a hood |
US6377987B1 (en) | 1999-04-30 | 2002-04-23 | Cisco Technology, Inc. | Mechanism for determining actual physical topology of network based on gathered configuration information representing true neighboring devices |
US6414974B1 (en) | 1999-09-07 | 2002-07-02 | Analog Devices, Inc. | Method and a control circuit for controlling the extinction ratio of a laser diode |
US6364396B1 (en) | 1999-10-19 | 2002-04-02 | Aisin Seiki Kabushiki Kaisha | Package tray for vehicle |
US6490302B1 (en) | 1999-10-28 | 2002-12-03 | Matsushita Electric Industrial Co., Ltd. | Semiconductor laser control circuit and laser light source |
US20050030744A1 (en) | 1999-11-18 | 2005-02-10 | Color Kinetics, Incorporated | Methods and apparatus for generating and modulating illumination conditions |
US6396062B1 (en) | 1999-12-03 | 2002-05-28 | Cymer, Inc. | Portable laser beam monitor |
DE19959700C1 (en) | 1999-12-10 | 2001-02-22 | Daimler Chrysler Ag | Displacement drive for cabriolet vehicle rear cover has locking elements for rear cover fixing hinge controlled by relatively sliding elements of each drive unit |
US6580531B1 (en) | 1999-12-30 | 2003-06-17 | Sycamore Networks, Inc. | Method and apparatus for in circuit biasing and testing of a modulated laser and optical receiver in a wavelength division multiplexing optical transceiver board |
US20010024459A1 (en) * | 2000-03-24 | 2001-09-27 | Seo Jin-Gyo | Apparatus for and method of controlling auto laser diode power |
US6502891B2 (en) | 2000-05-02 | 2003-01-07 | Wilhelm Karmann Gmbh | Convertible vehicle |
US6454342B2 (en) | 2000-06-15 | 2002-09-24 | Wilhelm Karmann Gmbh | Convertible vehicle |
US7421308B2 (en) | 2000-09-21 | 2008-09-02 | Gsi Group Corporation | Digital control servo system |
US6454343B1 (en) | 2000-10-10 | 2002-09-24 | Cts Fahrzeug-Dachsysteme Gmbh | Multi-part cover for vehicles |
US20030066947A1 (en) | 2000-10-13 | 2003-04-10 | Jim Alwan | Attenuation and calibration systems and methods for use with a laser detector in an optical communication system |
US20020105982A1 (en) | 2000-12-12 | 2002-08-08 | Jesse Chin | Open-loop laser driver having an integrated digital controller |
US20040197101A1 (en) | 2001-02-05 | 2004-10-07 | Sasser Gary D. | Optical transceiver module with host accessible on-board diagnostics |
US20040196754A1 (en) | 2001-02-26 | 2004-10-07 | Akira Mashimo | Optical disk device |
US20020175287A1 (en) | 2001-03-08 | 2002-11-28 | Busch Kenneth W. | Dispersive near-infrared spectrometer with automatic wavelength calibration |
US20040136423A1 (en) | 2001-05-15 | 2004-07-15 | Coldren Larry A | Sampled grating distributed bragg reflector laser controller |
US6907055B2 (en) | 2001-11-13 | 2005-06-14 | Analog Devices, Inc. | Method and circuit for measuring the optical modulation amplitude (OMA) in the operating region of a laser diode |
US7381935B2 (en) | 2004-11-19 | 2008-06-03 | Mindspeed Technologies, Inc. | Laser power control with automatic power compensation |
US7608806B2 (en) | 2004-11-19 | 2009-10-27 | Mindspeed Technologies, Inc. | Multiple parameter laser power control with automatic compensation |
US20070069155A1 (en) | 2005-09-28 | 2007-03-29 | Mirro Eugene Jr | Beam re-registration system and method |
Non-Patent Citations (44)
Title |
---|
European Office Action for EP Application No. 5746735.9, mailed Mar. 6, 2009. |
Final Office Action for U.S. Appl. No. 09/772,709, mailed Jan. 26, 2005. |
Final Office Action for U.S. Appl. No. 09/772,709, mailed Jan. 6, 2009. |
Final Office Action for U.S. Appl. No. 09/772,709, mailed Jun. 28, 2007. |
Final Office Action for U.S. Appl. No. 10/512,931, mailed Dec. 29, 2005. |
Final Office Action for U.S. Appl. No. 10/513,105, mailed Dec. 31, 2007. |
Final Office Action for U.S. Appl. No. 10/513,105, mailed Feb. 19, 2009. |
Final Office Action for U.S. Appl. No. 10/561,546, mailed Dec. 8, 2008. |
Final Office Action for U.S. Appl. No. 10/561,546, mailed Nov. 25, 2009. |
International Search Report for Application No. PCT/DE03/03280, mailed Mar. 22, 2004. |
International Search Report for Application No. PCT/US00/35123, mailed Mar. 4, 2001. |
International Search Report for Application No. PCT/US00/35125, mailed Sep. 8, 2002. |
International Search Report for Application No. PCT/US02/40940, mailed Apr. 4, 2003. |
International Search Report for Application No. PCT/US03/00848, mailed Jul. 30, 2003. |
International Search Report for Application No. PCT/US03/01032, mailed Jun. 18, 2003. |
International Search Report for Application No. PCT/US05/013561, mailed Sep. 9, 2005. |
International Search Report for Application No. PCT/US95/00215, mailed May 24, 1995. |
International Search Report for International Application No. PCT/US03/00463, mailed Jul. 30, 2003. |
Non Final Office Action for U.S. Appl. No. 09/772,709, mailed Apr. 4, 2008. |
Non Final Office Action for U.S. Appl. No. 09/772,709, mailed Aug. 19, 2005. |
Non Final Office Action for U.S. Appl. No. 09/772,709, mailed Jun. 3, 2004. |
Non Final Office Action for U.S. Appl. No. 09/772,709, mailed Nov. 30, 2006. |
Non Final Office Action for U.S. Appl. No. 10/512,931, mailed Jul. 1, 2005. |
Non Final Office Action for U.S. Appl. No. 10/513,105, mailed Apr. 6, 2007. |
Non Final Office Action for U.S. Appl. No. 10/513,105, mailed Aug. 4, 2009. |
Non Final Office Action for U.S. Appl. No. 10/513,105, mailed Sep. 3, 2008. |
Non Final Office Action for U.S. Appl. No. 10/561,546, mailed Mar. 5, 2008. |
Non Final Office Action for U.S. Appl. No. 10/561,546, mailed May 22, 2009. |
Non Final Office Action for U.S. Appl. No. 10/679,553, mailed Oct. 4, 2005. |
Non Final Office Action for U.S. Appl. No. 11/111,335, mailed Jul. 23, 2007. |
Non Final Office Action for U.S. Appl. No. 11/397,651, mailed Jun. 29, 2006. |
Non Final Office Action for U.S. Appl. No. 11/537,504, mailed Mar. 12, 2010. |
Non Final Office Action for U.S. Appl. No. 12/364,482, mailed Mar. 24, 2010. |
Notice of Allowance for EP Application No. 03 701 250.7, issued Sep. 1, 2008. |
Notice of Allowance for U.S. Appl. No. 09/772,709, mailed Sep. 3, 2009. |
Notice of Allowance for U.S. Appl. No. 10/512,931, mailed Aug. 25, 2006. |
Notice of Allowance for U.S. Appl. No. 10/513,091, mailed Jul. 2, 2008. |
Notice of Allowance for U.S. Appl. No. 10/531,091, mailed Mar. 11, 2008. |
Notice of Allowance for U.S. Appl. No. 10/561,546, mailed Jan. 29, 2010. |
Notice of Allowance for U.S. Appl. No. 11/397,651, mailed Nov. 9, 2006. |
Notice of Allowance for U.S. Appl. No. 11/537,504, mailed Aug. 19, 2010. |
Notice of Allowance for U.S. Appl. No. 12/364,482, mailed Sep. 17, 2010. |
Restriction Requirement for U.S. Appl. No. 10/513,091, mailed Apr. 11, 2007. |
Restriction Requirement for U.S. Appl. No. 10/513,091, mailed Jul. 30, 2007. |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140186056A1 (en) * | 2011-12-02 | 2014-07-03 | Semtech Corporation | Closed Loop Optical Modulation Amplitude Control |
US9300405B2 (en) * | 2011-12-02 | 2016-03-29 | Semtech Corporation | Closed loop optical modulation amplitude control |
Also Published As
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CA2475850A1 (en) | 2003-07-29 |
US20090225803A1 (en) | 2009-09-10 |
EP1529327A4 (en) | 2005-08-31 |
US20050249252A1 (en) | 2005-11-10 |
EP1529327A1 (en) | 2005-05-11 |
DE60326457D1 (en) | 2009-04-16 |
AU2003202238A1 (en) | 2004-08-10 |
US7876797B2 (en) | 2011-01-25 |
US7505498B2 (en) | 2009-03-17 |
WO2004064210A1 (en) | 2004-07-29 |
US20060165139A1 (en) | 2006-07-27 |
EP1529327B1 (en) | 2009-03-04 |
ATE424640T1 (en) | 2009-03-15 |
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