CA2107922A1 - Adjustable reflection control device for fiber optics - Google Patents
Adjustable reflection control device for fiber opticsInfo
- Publication number
- CA2107922A1 CA2107922A1 CA002107922A CA2107922A CA2107922A1 CA 2107922 A1 CA2107922 A1 CA 2107922A1 CA 002107922 A CA002107922 A CA 002107922A CA 2107922 A CA2107922 A CA 2107922A CA 2107922 A1 CA2107922 A1 CA 2107922A1
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- fiber optic
- gear
- control device
- diameter
- 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.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
-
- 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
-
- 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
- G02B6/42—Coupling light guides with opto-electronic elements
Abstract
ABSTRACT
AN ADJUSTABLE REFLECTION CONTROL DEVICE FOR FIBER OPTICS
An adjustable reflection control device for fiber optics comprising a resolution adjustment knob, a small shaft, a small gear, a large gear, a large shaft and a fiber optic coupler wherein the resolution of the device is proportional to the diameter of the shaft, the larger the radius of the shaft is, the smaller the rate of change of the bending loss will be, hence, the resolution obtained can be higher. The reflection of the fiber optics can be indicated on the adjustment knob. Whenever the diameter of the shaft has to be changed, only the shaft needs to be changed and the gear remains unchanged.
AN ADJUSTABLE REFLECTION CONTROL DEVICE FOR FIBER OPTICS
An adjustable reflection control device for fiber optics comprising a resolution adjustment knob, a small shaft, a small gear, a large gear, a large shaft and a fiber optic coupler wherein the resolution of the device is proportional to the diameter of the shaft, the larger the radius of the shaft is, the smaller the rate of change of the bending loss will be, hence, the resolution obtained can be higher. The reflection of the fiber optics can be indicated on the adjustment knob. Whenever the diameter of the shaft has to be changed, only the shaft needs to be changed and the gear remains unchanged.
Description
~7~22 ~N ADJUSTABL~ ~FLECTION CONTROL DEVI OE FOR FIBER OPTICS
(a~ Field of th~ Invention The present invention relates to an adjustable reflection control device for fiber optics. More specifically, the present invention relates to an adjustable reflection control device which can be used in system testiny and instrumentation measurement as well as sensor tèsting of fiber optic devices.
(b) Description of the Prior Art A conventional fiber optic reflection control device mainly adjusts the angle between the fiber optic source and the reflection mirror to vary the reflection.
The manufacturing of this dévice requires highly precision advanced technology and the device also requires proper maintenance. Therefore/ its cost is relatively high. The present invention provides a low-cost adjustabl~ -Eiber optic re~lection control device which does not require advanced technology ~o fabricat~.
Its basic principle is the use of the fiber optic ! bending loss characteristic so as to adjust the degree of reflection.
The main object according to ~he present invention is to provide a design of the adjustable reflection control device for fiber op-tic~ which does not require ~1 ~7922 advanced technology to manufacture and a protective device is not needed either. This new design uses the fiber optic ben~ing loss characteristic to overcome the above and other difficulties. It is simple of construction and economical of manufacture. :Ct is a .practical device which is suitable ~or mass production.
The drawings disclose an illustrative embodiment of the present invention which serves to exemplify the various advantages an~ objects hereof, and are as follows:
FIG~ lA is a diagrammatic view of a fiber optic coupler of the adjustable reflection control device ac~ording to the present invention. This view shows the fiber optics without bending;
~IG. lB is a diagrammatic view of a fiber optic coupler of the adjuskable reflection control device according to the present invention. This view shows the fiber optics are loop around a circle to form a bending loss;
FIG. 2A is a scheme showing the resolution adjustment knob for the reflec~ion control device according to the present invention;
FIG. 2B shows the major components of an assembly ,, , :
21 ~37~2~ :
(a~ Field of th~ Invention The present invention relates to an adjustable reflection control device for fiber optics. More specifically, the present invention relates to an adjustable reflection control device which can be used in system testiny and instrumentation measurement as well as sensor tèsting of fiber optic devices.
(b) Description of the Prior Art A conventional fiber optic reflection control device mainly adjusts the angle between the fiber optic source and the reflection mirror to vary the reflection.
The manufacturing of this dévice requires highly precision advanced technology and the device also requires proper maintenance. Therefore/ its cost is relatively high. The present invention provides a low-cost adjustabl~ -Eiber optic re~lection control device which does not require advanced technology ~o fabricat~.
Its basic principle is the use of the fiber optic ! bending loss characteristic so as to adjust the degree of reflection.
The main object according to ~he present invention is to provide a design of the adjustable reflection control device for fiber op-tic~ which does not require ~1 ~7922 advanced technology to manufacture and a protective device is not needed either. This new design uses the fiber optic ben~ing loss characteristic to overcome the above and other difficulties. It is simple of construction and economical of manufacture. :Ct is a .practical device which is suitable ~or mass production.
The drawings disclose an illustrative embodiment of the present invention which serves to exemplify the various advantages an~ objects hereof, and are as follows:
FIG~ lA is a diagrammatic view of a fiber optic coupler of the adjustable reflection control device ac~ording to the present invention. This view shows the fiber optics without bending;
~IG. lB is a diagrammatic view of a fiber optic coupler of the adjuskable reflection control device according to the present invention. This view shows the fiber optics are loop around a circle to form a bending loss;
FIG. 2A is a scheme showing the resolution adjustment knob for the reflec~ion control device according to the present invention;
FIG. 2B shows the major components of an assembly ,, , :
21 ~37~2~ :
of the reflec'cion control d~vice ~or fiber optics according to the present invention;
FIG. 2C shows the direction of rotation of the large and the small gears according to the present invention; and FIG. 2D is a scheme showing the adjustable reflection control device for fiber optics according to the present invention.
The bending loss characteristic of fiber optics used in the reflection control device is first discussed. ~eferring to FIG. lA~ which shows a fiber optic coupler 1 for the adjustable reflection control device according to the present invention. This is a 3 dB lx2 fiber optic coupler in which:
a is the input, b is the output and c is th~
2~ reflection~
Assu~e that the input power at a is P = 1 dBm, and Rate of reflection at c is -2 dB
(1) For the case without any bending loss, as shown in FIG. ~A, the reflection at -the output end b can be represented by P where:
-`` 2107~22 P = 1 dBm - 2 dB - (3 dB x 2~ = -7 dBm Total reflectivity = - 7 dBm - 1 dBm = -8 dB
where (3 dB x 2) as shown in the above equation is the double pass loss o~ the fiber optic coupler 1.
~ 2) For the case in which the fiber optics coil around a circle 2 to generate a bending loss of -10 dB, as is shown in FIG. lB. The reflected power P at the output end b can be represented by:
P = 1 dBm - 2 dB - (3 dB x 2) - (10 dB x 2) = -27 dBm Total reflectivity = -27 dBm - 1 dBm = -28 dB
Similarly, (3 dB x 2) as shown in the above equation is the double pass loss of the fiber optic coupler 1.
The bending loss varies with the ~iameter (2r) of the loop circle. The smaller the diameter is, the higher the bendinq loss will be. Therefore, the reflection at the output end b will be smallar. In general, a complets reflection can be obtained when the reflection at c has a high reflectivity coating. When the fiber optic 3 is cut to ha~e a flat surface, the reflectivity can be as high as -~5dB. Hence, when the return loss o~ the ~iber optic coupler is -~5 dB and the inserti.on loss is less than 3 dB, we can obtain -65 dB
~ . .
`: ' '',' ~ , : ' 2 1 0 7 ~ 2 2 to -6 dB of reflection using this technolog~.
The design principle and installation of the fiber optic reflection control device will be discussed next.
Referring to FIG. 2A, which shows a diagrammatic drawing of the resolution adjustment knob for the reflection control device according to the present invention. It consists of a resolution adjustment knob 21 which has markings to indicate the d~gree of reflection. The bottom of the resolution adjustment knob 21 is connected to a small shaft 20~ The bottom of the small shaft 20 is connected to an inser-tion member 26 which can be inserted into the central hole of the small gear 22. The bending loss of the fiber optics is proportional to the number of loops formed by the fiber optics. In addition, its resolution is proportional to the diameter of the shaft 20. The larger the diameter of the shaft is, the smaller the rate of change of khe bending loss will be and the better the resolution will be. The reflection can be directly indicated on the marking of the adjustment knob. Whenever the diameter of the shaft 20 has to be changed to another shat 20', the gear 22 does not require to be changed.
Referring to FIG. 2B, which shows a diagrammatic draw:ing of the major components of an assembly of the fiber optic reflection control device according to the present invention. The small shaft 20 is used to adjust the level and degree of reflection, as describecl in the previous section. Th~ large shaft is mainly used to collect and send the fiber optics. Therefore, the diameter of the large shaft shall be greater than the diameter of -the unit without inducing the hending loss.
Depending on the characteristic~ of the fiber optics, this diameter is generally 5 centimeter. Referring to FIG. 2C for the rotational direction of the large and the small gears according to the present invention. If the pitch of the large gear 2~ and the small gear 22 are identical, and the teeth ratio of the large gear to the small gear is approximately equal to the ratio of their diameters, then the synchronous out-of-phase send and collection o~ the fiber optic length are identical.
There is no twisting loss. Also, ~he smaller the pitch is, the more precise the result will be. In addition, the diameter of the large gear 23 i5 much larger than the diameter of the small gear 20, all it requires is 1 to 2 loops of circle. The fiber optic coupler 25 is secured on the case. Please refer to FIG. 2D for a diagrammatic drawing the reflec~ion con~rol device for fiber optics according to the present invention.
The adjustable reflection control clevice ~or fiber optics according to the present invention has the .
~ . :' ' :: . .: ~
.
: ~ : , ~--" 2~ ~7~2 following features:
(1) The components for the assembly are easy to -obtain.
~ 2) The structure of the device is very flexible.
The resolution only varies with the diameter of the small shaft. Therefore, the adjustmsnt can be performed in any manner. ~ ~
,,, (3) The design is new. It fully utilize khe characteristics of the fiber optics. Hence, advanced technology required in manufacturing and maintenance is eliminated and the cost is driven to b~ lowered.
(4~ The structure is simple and is easy to fabricateO It is practical to meet the demands of low cost and is suitable for mass production.
:
While there have been shown and described what. are considered at present to ~e the pre~erred embodiments of the present invention, it will be appreciated by those skilled in the art tha~ modifications of such emhodiments may be made. It is therefore desired tha~
the invention not be limited to these embodi~ents, and it is intended to cover in the appended claims all such modifications as fall within -the time spirit and scope 7 - ` :
2~ Q7.~22 of the invention.
' ,-: :
FIG. 2C shows the direction of rotation of the large and the small gears according to the present invention; and FIG. 2D is a scheme showing the adjustable reflection control device for fiber optics according to the present invention.
The bending loss characteristic of fiber optics used in the reflection control device is first discussed. ~eferring to FIG. lA~ which shows a fiber optic coupler 1 for the adjustable reflection control device according to the present invention. This is a 3 dB lx2 fiber optic coupler in which:
a is the input, b is the output and c is th~
2~ reflection~
Assu~e that the input power at a is P = 1 dBm, and Rate of reflection at c is -2 dB
(1) For the case without any bending loss, as shown in FIG. ~A, the reflection at -the output end b can be represented by P where:
-`` 2107~22 P = 1 dBm - 2 dB - (3 dB x 2~ = -7 dBm Total reflectivity = - 7 dBm - 1 dBm = -8 dB
where (3 dB x 2) as shown in the above equation is the double pass loss o~ the fiber optic coupler 1.
~ 2) For the case in which the fiber optics coil around a circle 2 to generate a bending loss of -10 dB, as is shown in FIG. lB. The reflected power P at the output end b can be represented by:
P = 1 dBm - 2 dB - (3 dB x 2) - (10 dB x 2) = -27 dBm Total reflectivity = -27 dBm - 1 dBm = -28 dB
Similarly, (3 dB x 2) as shown in the above equation is the double pass loss of the fiber optic coupler 1.
The bending loss varies with the ~iameter (2r) of the loop circle. The smaller the diameter is, the higher the bendinq loss will be. Therefore, the reflection at the output end b will be smallar. In general, a complets reflection can be obtained when the reflection at c has a high reflectivity coating. When the fiber optic 3 is cut to ha~e a flat surface, the reflectivity can be as high as -~5dB. Hence, when the return loss o~ the ~iber optic coupler is -~5 dB and the inserti.on loss is less than 3 dB, we can obtain -65 dB
~ . .
`: ' '',' ~ , : ' 2 1 0 7 ~ 2 2 to -6 dB of reflection using this technolog~.
The design principle and installation of the fiber optic reflection control device will be discussed next.
Referring to FIG. 2A, which shows a diagrammatic drawing of the resolution adjustment knob for the reflection control device according to the present invention. It consists of a resolution adjustment knob 21 which has markings to indicate the d~gree of reflection. The bottom of the resolution adjustment knob 21 is connected to a small shaft 20~ The bottom of the small shaft 20 is connected to an inser-tion member 26 which can be inserted into the central hole of the small gear 22. The bending loss of the fiber optics is proportional to the number of loops formed by the fiber optics. In addition, its resolution is proportional to the diameter of the shaft 20. The larger the diameter of the shaft is, the smaller the rate of change of khe bending loss will be and the better the resolution will be. The reflection can be directly indicated on the marking of the adjustment knob. Whenever the diameter of the shaft 20 has to be changed to another shat 20', the gear 22 does not require to be changed.
Referring to FIG. 2B, which shows a diagrammatic draw:ing of the major components of an assembly of the fiber optic reflection control device according to the present invention. The small shaft 20 is used to adjust the level and degree of reflection, as describecl in the previous section. Th~ large shaft is mainly used to collect and send the fiber optics. Therefore, the diameter of the large shaft shall be greater than the diameter of -the unit without inducing the hending loss.
Depending on the characteristic~ of the fiber optics, this diameter is generally 5 centimeter. Referring to FIG. 2C for the rotational direction of the large and the small gears according to the present invention. If the pitch of the large gear 2~ and the small gear 22 are identical, and the teeth ratio of the large gear to the small gear is approximately equal to the ratio of their diameters, then the synchronous out-of-phase send and collection o~ the fiber optic length are identical.
There is no twisting loss. Also, ~he smaller the pitch is, the more precise the result will be. In addition, the diameter of the large gear 23 i5 much larger than the diameter of the small gear 20, all it requires is 1 to 2 loops of circle. The fiber optic coupler 25 is secured on the case. Please refer to FIG. 2D for a diagrammatic drawing the reflec~ion con~rol device for fiber optics according to the present invention.
The adjustable reflection control clevice ~or fiber optics according to the present invention has the .
~ . :' ' :: . .: ~
.
: ~ : , ~--" 2~ ~7~2 following features:
(1) The components for the assembly are easy to -obtain.
~ 2) The structure of the device is very flexible.
The resolution only varies with the diameter of the small shaft. Therefore, the adjustmsnt can be performed in any manner. ~ ~
,,, (3) The design is new. It fully utilize khe characteristics of the fiber optics. Hence, advanced technology required in manufacturing and maintenance is eliminated and the cost is driven to b~ lowered.
(4~ The structure is simple and is easy to fabricateO It is practical to meet the demands of low cost and is suitable for mass production.
:
While there have been shown and described what. are considered at present to ~e the pre~erred embodiments of the present invention, it will be appreciated by those skilled in the art tha~ modifications of such emhodiments may be made. It is therefore desired tha~
the invention not be limited to these embodi~ents, and it is intended to cover in the appended claims all such modifications as fall within -the time spirit and scope 7 - ` :
2~ Q7.~22 of the invention.
' ,-: :
Claims
1. An adjustable fiber optic reflection control device comprising:
a resolution adjustment knob which has markings to indicate the degree of reflection, the bottom of the resolution adjustment knob is connected to a small shaft;
the small shaft, having its bottom part connected to an insertion member which can be inserted into the central hole of said small gear;
a small gear;
a large gear in which the pitch is identical to that of small gear , the teeth ratio of the large gear to the small gear is approximately equal to the ratio of their diameters, thus, the synchronous out-of-phase transmission and receiving of the fiber optic length are identical, also, the smaller the distances between the teeth gear are, the more precise the result will be;
a large shaft, which is mainly used to transmit and receive fiber optics, the diameter of the large shaft is greater than the diameter of the unit without inducing any bending loss;
a fiber optic coupler which is mounted on the case of the device;
wherein the adjustable fiber optic reflection control device utilizes the ratio of the bending loss to the number of loops that the fiber optic formed, the resolution of the device is proportional to the diameter of the shaft, the larger the radius of the shaft is, the smaller the rate of change of the bending loss will be, hence, the resolution obtained can be higher, the reflection of the fiber optic can be indicated on the adjustment knob, whenever the diameter of the shaft has to be changed, only the shaft needs to be changed and the gear remains unchanged.
a resolution adjustment knob which has markings to indicate the degree of reflection, the bottom of the resolution adjustment knob is connected to a small shaft;
the small shaft, having its bottom part connected to an insertion member which can be inserted into the central hole of said small gear;
a small gear;
a large gear in which the pitch is identical to that of small gear , the teeth ratio of the large gear to the small gear is approximately equal to the ratio of their diameters, thus, the synchronous out-of-phase transmission and receiving of the fiber optic length are identical, also, the smaller the distances between the teeth gear are, the more precise the result will be;
a large shaft, which is mainly used to transmit and receive fiber optics, the diameter of the large shaft is greater than the diameter of the unit without inducing any bending loss;
a fiber optic coupler which is mounted on the case of the device;
wherein the adjustable fiber optic reflection control device utilizes the ratio of the bending loss to the number of loops that the fiber optic formed, the resolution of the device is proportional to the diameter of the shaft, the larger the radius of the shaft is, the smaller the rate of change of the bending loss will be, hence, the resolution obtained can be higher, the reflection of the fiber optic can be indicated on the adjustment knob, whenever the diameter of the shaft has to be changed, only the shaft needs to be changed and the gear remains unchanged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002107922A CA2107922A1 (en) | 1993-10-07 | 1993-10-07 | Adjustable reflection control device for fiber optics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002107922A CA2107922A1 (en) | 1993-10-07 | 1993-10-07 | Adjustable reflection control device for fiber optics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2107922A1 true CA2107922A1 (en) | 1995-04-08 |
Family
ID=4152412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002107922A Abandoned CA2107922A1 (en) | 1993-10-07 | 1993-10-07 | Adjustable reflection control device for fiber optics |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2107922A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7058260B2 (en) * | 2002-10-15 | 2006-06-06 | Wave7 Optics, Inc. | Reflection suppression for an optical fiber |
| US7877014B2 (en) | 2001-07-05 | 2011-01-25 | Enablence Technologies Inc. | Method and system for providing a return path for signals generated by legacy video service terminals in an optical network |
| US7953325B2 (en) | 2004-08-19 | 2011-05-31 | Enablence Usa Fttx Networks, Inc. | System and method for communicating optical signals between a data service provider and subscribers |
| US7986880B2 (en) | 2003-03-14 | 2011-07-26 | Enablence Usa Fttx Networks Inc. | Method and system for providing a return path for signals generated by legacy terminals in an optical network |
-
1993
- 1993-10-07 CA CA002107922A patent/CA2107922A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7877014B2 (en) | 2001-07-05 | 2011-01-25 | Enablence Technologies Inc. | Method and system for providing a return path for signals generated by legacy video service terminals in an optical network |
| US7058260B2 (en) * | 2002-10-15 | 2006-06-06 | Wave7 Optics, Inc. | Reflection suppression for an optical fiber |
| US7986880B2 (en) | 2003-03-14 | 2011-07-26 | Enablence Usa Fttx Networks Inc. | Method and system for providing a return path for signals generated by legacy terminals in an optical network |
| US8682162B2 (en) | 2003-03-14 | 2014-03-25 | Aurora Networks, Inc. | Method and system for providing a return path for signals generated by legacy terminals in an optical network |
| US7953325B2 (en) | 2004-08-19 | 2011-05-31 | Enablence Usa Fttx Networks, Inc. | System and method for communicating optical signals between a data service provider and subscribers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |