USRE39934E1 - Adjustable optical attenuator - Google Patents
Adjustable optical attenuator Download PDFInfo
- Publication number
- USRE39934E1 USRE39934E1 US10/324,028 US32402802A USRE39934E US RE39934 E1 USRE39934 E1 US RE39934E1 US 32402802 A US32402802 A US 32402802A US RE39934 E USRE39934 E US RE39934E
- Authority
- US
- United States
- Prior art keywords
- light
- attenuating
- attenuator
- optical attenuator
- circular cross
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/353—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being a shutter, baffle, beam dump or opaque element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3594—Characterised by additional functional means, e.g. means for variably attenuating or branching or means for switching differently polarized beams
Definitions
- This invention relates to an optical attenuator for attenuating the intensity of a beam of light, and in particular to an optical attenuator that preserves the composition of polarization of a beam of light over a wide range of attenuation.
- the system is designed for a normal amount of signal loss between transmitter and detector. At the detector, the signal strength must be maintained within an appropriate range. The minimum strength is determined by the need for an adequate signal-to-noise ratio. The maximum strength is determined by the need to avoid an overload of the detector.
- an optical attenuator comprising a disk formed from two separate portions, a wedge shaped disk made of a light absorbing material affixed to a wedge shaped transparent disk.
- the disk is rotated around an axis by a motor.
- the attenuator needs a complex setup to compensate for refraction and resulting beam deviations. The compensations ensure that the beam of light is coupled into the optical fiber at any angular orientation of the attenuator disk. As such, the device is expensive and prone to reliability problems.
- a method of attenuating a beam of light having a circular cross-section comprises the step of disposing a member within the beam of light, the intersection of the member and the beam of light defining a region having two substantially equal sides defining an angle other than 0 degrees and 180 degrees therebetween the two sides having a central line of symmetry coincident with a line of symmetry through the centre of the circle, the angle moving along the line of symmetry.
- optical attenuator for attenuating a beam of light having a circular cross-section.
- the optical attenuator comprises:
- FIG. 1 is a schematic diagram of an attenuator according to the invention comprising a cone disposed within the optical path;
- FIG. 2 is a schematic diagram of a projection of a cone covering a cross sectional portion of a collimated beam of light
- FIG. 3 is a diagram showing polarization dependent loss as function of attenuation for an attenuator according to the invention compared with a prior art device;
- FIG. 4 is a schematic diagram of another embodiment of an attenuator according to the invention comprising an edge with a wedge shaped opening disposed within the optical path;
- FIG. 5 is a schematic diagram of another embodiment of an attenuator according to the invention comprising a cone disposed within the optical path;
- FIG. 6 is a schematic diagram of a projection of a cone covering a cross sectional portion of a reflected beam of light.
- FIG. 7 is a schematic diagram of another embodiment of an attenuator according to the invention comprising a cone disposed within the optical path, the cone being affixed to an axle for rotation;
- FIG. 8 is a schematic diagram of another embodiment according to the invention wherein the beam attenuator is formed of two sheets of opaque material; and,
- FIG. 8a is a schematic diagram of a projection of the two sheets shown in FIG. 8 covering a cross sectional portion of a collimated beam of light.
- an attenuator 10 according to the invention is shown.
- Light transmitted in an optical fiber 11 is collimated using an input lens 12 .
- the collimated beam of light 16 passes through a gap between the input lens 12 and an output lens 14 where the collimated beam of light is focused and received by the output lens 14 and coupled into an optical fiber 15 .
- the gap contains a substance such as air which does not substantially attenuate the beam of light.
- the output lens 14 is a graded index (GRIN) lens. Fiber or rod lenses of this type are produced under the trade name “SELFOC”; the mark is registered in Japan and owned by the Nippon Sheet and Glass Co. Ltd.
- a beam attenuator in the form of a member 18 for attenuating a portion of the collimated beam of light 16 such as an opaque cone 18 is disposed within the optical path perpendicular to the longitudinal axis of the collimated beam of light 16 .
- FIG. 2 shows a projection of the cone 18 covering a cross sectional portion of the collimated beam of light 16 . Interrupting a portion of the collimated beam of light 16 , the portion the size of the wedge, results in an attenuation of light intensity of the beam of light 16 received at the output lens 14 .
- the attenuation is varied by varying the size of the portion of the cone 18 within the optical path. This is accomplished by moving the cone 18 in a direction substantially perpendicular to the principle axis of the beam of light using a controller 20 .
- the attenuator comprises an opaque cone within a transparent body.
- an attenuator is realised by immersing a cone made of laminated glass in a transparent fluid, the glass and the fluid having matching refractive indices. During a cooling process the fluid solidifies and retains the cone at a predetermined location within the solidified fluid.
- the attenuator comprises a transparent body having a conic indention, wherein the surface of the body defining the indention is covered with a layer of opaque or light absorbing material.
- the cone 18 comprises an angle of 90 degrees.
- the cone is moved into the beam of light such that the point of the cone moves along a diameter of a cross section of the beam of light and the side of the cone that is illuminated by the beam of light is substantially symmetrical about the diameter. In this way, approximately an equal amount of light of each orthogonal polarization is blocked or attenuated.
- FIG. 3 is a diagram showing the Polarization Dependent Loss (PDL) as a function of the attenuation for the attenuator according to the invention 32 in comparison with a prior art device 30 comprising a straight edge.
- PDL Polarization Dependent Loss
- the PDL for an attenuator according to the invention is substantially constant and low level over a wide range of attenuation.
- the PDL for the straight edge is increasing with increasing attenuation for attenuations greater than 10 dB.
- a high value of PDL indicates a strong dependence of the attenuation on the polarization of the collimated light, for example a component with vertical polarization may be substantially attenuated while a horizontal component is not affected. This results in a change of the polarization composition of the collimated beam of light during the attenuation. A change of polarization due to attenuation is an undesirable effect.
- the beam of light 16 is attenuated using a wedge shaped edge.
- the edge comprises at least an outer layer of light absorbing material in order to prevent light reflected from the edge from interfering with the incoming beam of light 16 .
- the wedge is substantially flat, thereby allowing it to be moved into and out of a narrow gap.
- the attenuator comprises a wedge shaped body of light absorbing material.
- FIG. 4 shows a further embodiment of an attenuator according to the invention.
- a cross sectional portion of the collimated beam of light 16 is covered by an edge 18 having a wedge shaped opening moved along an axis of symmetry 19 through the center of the beam of light.
- the two edges act to block light from the light beam so as to maintain the polarization composition thereof.
- the wedge shaped opening when moved into the beam of light 16 defines two substantially equal sides within the beam of light 16 .
- the angle of the wedge is moved along a central line of the beam of light 16 . Since the beam of light is substantially circular, the central line is a diameter of the circle.
- the two substantially equal sides within the beam of light 16 are substantially symmetrical about the same diameter.
- the attenuator comprises a body of light absorbing material having a wedge shaped opening.
- FIG. 5 another embodiment of an attenuator 10 according to the invention is shown.
- An optical fiber 11 is connected to an input/output lens 17 .
- Light transmitted in the optical fiber 11 is collimated using an input/output lens 17 .
- the collimated beam of light 16 passes through an air gap between the input/output lens 17 and a reflective surface 25 , such as a mirror, where the collimated beam of light is reflected to the input/output lens 17 and coupled into an optical fiber 15 .
- An opaque cone 18 is disposed within the optical path perpendicular to the longitudinal axis of the collimated beam of light 16 between the input/output lens 17 and the mirror 25 . Moving the cone is achieved, for example, using a screw mechanism.
- FIG. 6 shows a projection of the cone 18 covering a cross sectional portion of the collimated beam of light 16 reflected from the reflective surface 25 .
- the beam of light 16 is reflected by the reflective surface 25 onto an output lens 14 , different from the input lens 12 .
- the cone 18 is moved in another fashion such that the tip of the cone is within the optical path of the collimated beam of light 16 and the portion of the beam of light 16 blocked by the cone is altered.
- a cone 18 is shown affixed to an axle 40 .
- the cone 18 is moved into and out of the path of a beam of light by rotating the axle 40 .
- This allows for a simpler mechanism than that necessary for transverse motion.
- it requires more space as the lenses 12 and 14 are spaced sufficiently to allow the cone 18 to rotate into and out of the optical path.
- FIGS. 8 and 8a another embodiment of an attenuator according to the invention is shown.
- An optical fiber 11 is connected to an input/output lens 17 .
- Light transmitted in the optical fiber 11 is collimated using an input/output lens 17 .
- the collimated beam of light 16 passes through an air gap between the input/output lens 17 and a reflective surface 25 , such as a mirror, where the collimated beam of light is reflected to the input/output lens 17 and coupled into an optical fiber 15 .
- a beam attenuator in the form of two slanted sheets 18 a and 18 b of opaque material is disposed within the optical path.
- An angle is defined between the two sheets. Preferably, the angle is 90 degrees.
- the two sheets are moved toward each other such that each sheet is equidistant from a centre of the circular cross section of the beam of light 16 .
- the resulting amount of the beam of light 16 that is blocked is a same amount as that blocked by the member having a wedge shaped opening and described above.
- a beam attenuator according to the invention is defined herein and in the claims that follow to comprise an object or a portion of an object, the object or the portion of an object for attenuating light.
- the beam attenuator refers to the opaque arrowhead.
Abstract
Description
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- a member for attenuating a portion of the beam of light when a portion of the member is disposed within the beam of light, the member being disposed within the beam of light such that the intersection of the member and the beam of light defines a region having two substantially equal sides defining an angle other than 0 degrees and 180 degrees therebetween, the two sides having a central line of symmetry coincident with a line of symmetry through the centre of the circle, the angle moving along the line of symmetry; and,
- a controller for moving the member in order to vary a size of the portion of the member within the beam of light.
Claims (33)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/324,028 USRE39934E1 (en) | 1998-11-24 | 2002-12-20 | Adjustable optical attenuator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/198,607 US6167185A (en) | 1998-11-24 | 1998-11-24 | Adjustable optical attenuator |
US10/324,028 USRE39934E1 (en) | 1998-11-24 | 2002-12-20 | Adjustable optical attenuator |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/198,607 Reissue US6167185A (en) | 1998-11-24 | 1998-11-24 | Adjustable optical attenuator |
Publications (1)
Publication Number | Publication Date |
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USRE39934E1 true USRE39934E1 (en) | 2007-12-04 |
Family
ID=22734065
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/198,607 Ceased US6167185A (en) | 1998-11-24 | 1998-11-24 | Adjustable optical attenuator |
US10/324,028 Expired - Lifetime USRE39934E1 (en) | 1998-11-24 | 2002-12-20 | Adjustable optical attenuator |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/198,607 Ceased US6167185A (en) | 1998-11-24 | 1998-11-24 | Adjustable optical attenuator |
Country Status (2)
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US (2) | US6167185A (en) |
CA (1) | CA2288290C (en) |
Families Citing this family (410)
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Also Published As
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CA2288290A1 (en) | 2000-05-24 |
US6167185A (en) | 2000-12-26 |
CA2288290C (en) | 2004-07-20 |
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