WO2000054082A1 - Mecanisme de commande de tension pour dispositifs a reseaux de bragg - Google Patents
Mecanisme de commande de tension pour dispositifs a reseaux de bragg Download PDFInfo
- Publication number
- WO2000054082A1 WO2000054082A1 PCT/CA2000/000253 CA0000253W WO0054082A1 WO 2000054082 A1 WO2000054082 A1 WO 2000054082A1 CA 0000253 W CA0000253 W CA 0000253W WO 0054082 A1 WO0054082 A1 WO 0054082A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bragg grating
- fiber bragg
- control mechanism
- tension
- adjustment
- Prior art date
Links
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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02195—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating
- G02B6/022—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating using mechanical stress, e.g. tuning by compression or elongation, special geometrical shapes such as "dog-bone" or taper
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass
- G02F1/0115—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass in optical fibres
Definitions
- the present invention relates to a tension control mechanism for controlling the spectral properties of Bragg gratings.
- fiber Bragg gratings The characteristic optical spectral properties of fiber Bragg gratings and the available techniques to tailor these properties both during and after fabrication allows them to form the basis of a wide variety of devices. These devices include strain, pressure and temperature sensors, spectral filters, and chromatic dispersion compensation devices among others.
- fiber gratings have been configured to fulfill the optical filtering requirements of high capacity WDM (wavelength division multiplexing) optical transmission systems where its spectral filtering capability is used to isolate optical carriers for the purpose of de-multiplexing and adding or dropping carriers.
- WDM wavelength division multiplexing
- Specially chirped fiber gratings are also used for the purpose of correcting the chromatic dispersion which exists in many optical transmission systems, particularly in the case of high capacity systems where high speed TDM (time division multiplexing) and long repeater-less links are employed.
- TDM time division multiplexing
- the sensitivity of the fiber grating spectral characteristics to external influence from physical strain is used to provide a measure of the deformation of various structures such as bridge components or ship hulls.
- the fiber Bragg grating In many of these applications the fiber Bragg grating must be mounted and packaged in special ways such that it satisfies performance requirements.
- the mounting and packaging technique used must fulfill purposes such as the following: providing physical protection, environmental stability, tunability, and attachment to other components.
- the characteristic center wavelength of the fiber Bragg grating must be controlled to close tolerances. This requirement may exceed the capability of fiber Bragg grating fabrication or the procedures used in mounting and packaging them.
- the fiber Bragg grating is often bonded to a substrate and the bonding procedure can induce a change in its center wavelength by an amount that is difficult to predict reliably. There is therefore a need for a device that will allow fine-tuning of the fiber Bragg grating center wavelength and other spectral characteristics in its mounted and packaged state. This provides for a higher accuracy and greater cost effectiveness in fiber Bragg grating device manufacture.
- the present invention relates to an adjustable tension control device that will allow fine-tuning of the fiber Bragg grating center wavelength and other spectral characteristics after the Bragg grating has been attached or bonded to a support structure forming part of the mechanism. This provides for a higher accuracy and greater cost effectiveness in fiber Bragg grating device manufacture. This technique may also be used to provide for manufacture of a tunable device, either manually by way of a turn screw or electronically by way of an actuator.
- the tension control mechanism for controlling the spectral properties of fiber Bragg gratings.
- the tension control mechanism includes a support structure to which the fiber Bragg grating is attached at a first and second portion.
- the support structure includes an adjustment mechanism whereby adjustment of the support structure in one direction increases tension in the fiber Bragg grating and adjustment of the support structure in the other direction decreases tension in the fiber Bragg grating.
- a tension controlled fiber Bragg grating assembly for controlling the spectral properties of the Bragg grating.
- the assembly includes an optical fiber having a Bragg grating attached to an adjustable support structure.
- the fiber Bragg grating is attached at a first and second portion.
- the support structure includes an adjustment mechanism whereby adjustment of the support structure in one direction increases tension in the fiber Bragg grating and adjustment of the support structure in the other direction decreases tension in the fiber Bragg grating.
- the support structures may include first and second spaced apart supports. Further the support structures may include an adjustable slot. The slot may be positioned in one of the spaced apart supports, along the length of the body or along the width of the body.
- Figure 1 is an elevational view of a tension control mechanism constructed in accordance with the present invention
- Figure 2 is an elevational view of a second embodiment of a tension control mechanism constructed in accordance with the present invention.
- Figure 3 is an elevational view of a third embodiment of a tension control mechanism constructed in accordance with the present invention.
- Figure 4 is a bottom view of the tension control mechanism of Figure 3.
- Figure 5 is an elevational view of a fourth embodiment of a tension control mechanism constructed in accordance with the present invention.
- Figure 6 is a top view of the tension control mechanism of Figure 5.
- the present invention provides a mechanism for controlling the tension of a guided wave Bragg grating device.
- the tension imposed on a guided wave Bragg grating can be used to control its spectral characteristics as desired.
- the center wavelength of a fiber Bragg grating can be directly controlled by the tension imposed on the fiber, and in the case of a nonlinearly chirped grating, its effective group delay properties can be also be controlled by fiber tension.
- These examples are directly related to applications in WDM filters, in dispersion compensation devices and in sensing. These mechanisms can also be used to adjust the level of compression in devices which maintain the Bragg grating in a state of compression.
- the mechanism of the present invention relies on the imposition of deformation onto the element to which the Bragg grating is attached in such a manner as to achieve a high degree of control of the tension in the grating and hence control of the grating center wavelength or other optical characteristics which can be controlled by tensile strain.
- the degree of control necessary in many practical implementations is essential to the success of such a device.
- tensile deformations must be controlled within magnitudes of the order of 10 microns.
- the present invention offers the degree of control necessary to yield such highly accurate tuning.
- tuning of the grating can be accomplished after manufacturing procedures such as Bragg grating fabrication and bonding which are difficult and costly to control to equivalent tolerances.
- a fiber Bragg grating 12 is mounted on a support structure 18.
- Support structure 18 includes a body 19 with two spaced apart supports 20 and 22 at each end thereof.
- the end portions 14 and 16 of fiber Bragg grating 12 are bonded to the two spaced apart supports 22 and 20.
- Preferably end portions 14 and 16 are bonded as close to the inside edge of supports 20 and 22 as practicable.
- the middle portion of the grating 12 is freely suspended between supports 20 and 22.
- Supports 20 and 22 may serve additional functions such as temperature stabilization, as has been put forth in schemes which utilize the principle of applying a thermally dependent tension on a grating which is attached at its ends to compensating members of various constructions and materials such as U.S. Patent No. 5,042,898, "Incorporated Bragg filter temperature compensated optical waveguide device", Morey, W.W. and Glomb, W.I. In response to temperature changes these members undergo thermal expansion thereby imposing on the grating the necessary tension adjustment to cancel the inherent thermal effects on the grating center wavelength.
- Figure 1 illustrates a means by which the support structure is deformed in a controlled manner to effectively alter the free unsupported length of the fiber containing the Bragg grating thereby increasing or decreasing the tension in the Bragg grating as desired.
- Support 22 is provided with two spaced apart arms 24 and 26 defining a slot 28 therebetween and the distance between the arms can be adjusted using an adjustment set-screw 30. Adjustment of the adjustment set-screw 30 displaces arm 24 either toward or away from arm 26.
- the slot 28 in the support 22 between arms 24 and 26 allows the inside edge 32 of the support to rotate counter clockwise when the screw 30 is advanced and clockwise when the screw 30 is retracted.
- Counter clockwise rotation of edge 32 serves to advance the upper edge to which the optical fiber is bonded and hence reduces the tension in the grating and clockwise rotation of edge 32 has the opposite effect. Accordingly, adjustment of screw 30 causes rotation and bending of the arms 24 and 26 and displacement of the portion 14 of the fiber Bragg grating 12.
- the position and depth of the slot 28 and the length and thickness of the slot arms 24 and 26 are designed such that a relatively large displacement of the set-screw 30 produces a very small displacement of the support edge 32.
- the enhanced control is accomplished by both the relatively large length between the set-screw 30 and the effective hinge at the head 34 of the slot 28, and the compliance of the slot arms 24 and 26. For the tuning to be reversible this deformation must be accomplished within the elastic range of the material used for support section 22.
- FIG 2 a second embodiment of a tension control mechanism is shown in which a fiber Bragg grating 12 is mounted on a support structure 40.
- Support structure 40 includes a body 49 and two spaced apart supports 41 and 42.
- the end portions 14 and 16 of fiber Bragg grating 12 are bonded to the two spaced apart supports 42 and 41.
- the middle portion of the Bragg grating 12 is freely suspended between supports 41 and 42.
- an elongate slot 43 is provided along the length of the support structure 40.
- Members 46 and 47 are on either side of elongate slot 43 and form part of support structure 40.
- a mechanism such as a screw 48 is positioned at a point along its length and perpendicular to the axis of slot 43 such that adjustment of the screw 48 causes the elongate slot 43 to be opened more or less.
- the accompanying deformation will cause the support structure to deform in such a way that the supports 41 and 42 rotate about an effective hinge at 44 and 45 which are partial extensions of supports 41 and 42 at opposed ends of the slot 43.
- adjustment of the screw 48 causes relative rotation of the spaced apart supports 41 and 42 and displacement of the end points 14 and 16 of the fiber Bragg grating 12.
- the support structure 40 can be designed such that compliance in the members 46 and 47 formed by the slot provides enhanced control of the support rotation with the screw. The controlled rotation of the supports 41 and 42 will allow the tension in the grating 12 to be controlled precisely.
- FIG. 3 and 4 A third embodiment of a tension control mechanism is shown in Figures 3 and 4 where the fiber Bragg grating is mounted on a support structure 50 as in the above embodiments.
- the end portions 14 and 16 of fiber Bragg grating 12 are bonded to two spaced supports 52 and 51 forming part of the support structure 50.
- the middle portion of the Bragg grating 12 is freely suspended between supports 51 and 52.
- the grating tension control is obtained by controlling the deformation at a slot 55 in the main body 54 of the support structure 50.
- Slot 55 is perpendicular to the longitudinal axis of the main body 54.
- the slot 55 extends across the width of the main body (as shown in Figure 4) and only part of the way through its thickness.
- a screw 58 in a tapered hole or some other wedge mechanism can be used to open the slot in a controlled manner such that the main body bends at the effective hinge location 53 and the supports undergo a rotation. Accordingly adjustment of screw 58 causes rotation of the main body 54 on each side of slot 55 and displacement of the end portions 14 and 16 of fiber Bragg grating 12. The resultant effect is a controlled reduction of the tension in the grating 12 and thereby control of the grating center wavelength.
- Tension control mechanism 60 includes a body 62 with two spaced apart supports 64 and 66 at each end thereof. In addition body 62 has two spaced apart side walls 68 and 70 with a groove 72 therebetween. The end portions 14 and 16 of fiber Bragg grating 12 are bonded to the two spaced apart supports 64 and 66. The middle portion of the grating 12 is freely suspended between supports 64 and 66 over groove 72.
- Support 64 is provided with two spaced apart arms 74 and 76 defining a slot 78 therebetween and the distance between the arms can be adjusted using an adjustment set-screw 80.
- a lateral slot 84 is provided at the end of support 64.
- Groove 72 has a step portion 86 at the end thereof.
- a lateral groove 88 is formed in the side walls spaced from the end of body 62 and above step portion 86.
- Support 66 is a generally cross shaped member that sits on step portion 86 and is positioned in lateral groove 88.
- the elongate portion 90 of cross shaped support 66 is spaced above groove 72 and spaced inwardly from side walls 68 and 70.
- Support 66 may function as a thermal compensation bar such that the thermal response of the Bragg grating is annulled.
- a center groove 92 is provided in support 64 and 66 and fibre Bragg grating 12 is positioned therein and attached thereto.
- adjustment of the adjustment set-screw 80 displaces arm 74 either toward or away from arm 76.
- the slot 78 in the support 64 between arms 74 and 76 allows the inside edge 82 of the support to rotate counter clockwise when the screw 80 is advanced and clockwise when the screw 80 is retracted.
- Counter clockwise rotation of edge 82 serves to advance the upper edge to which the optical fiber is bonded and hence reduces the tension in the grating and clockwise rotation of edge 82 has the opposite effect. Accordingly, adjustment of screw 80 causes rotation and bending of the arms 74 and 76 and displacement of the end portion 14 of the fiber Bragg grating 12.
- body 62 is made of invar and support 66 is made of brass. Alternatively the support is made of stainless steel.
- the overall length of body 62 is 50 mm.
- the length of support 66 is 15 mm, of support 64 is 13 mm, and of slot 78 is 12 mm.
- the height of the slot is 0.6 mm.
- the middle portion of fiber Bragg grating 12 is 22 mm. With the embodiment as described herein provides a tuning range of approximately 0 - 0.2 nanometers of the fiber Bragg grating center wavelength.
- the tension control mechanism of the present invention can be used in a number of applications. Specifically it would be to produce a tunable filter wherein the fiber Bragg grating center wavelength is tunable on the order of one or several nanometer including between about 0 and about 9 nanometers. This would have specific application in regard to WDM optical transmission systems or optical test and measurement applications.
- the tension control mechanism of the present invention can be used as a fine tuning device wherein the filter spectral position is optimized. Accordingly, when the mechanism is used for fine tuning it may be designed to be used in a range of 0 to 0.5 nanometers or, as in the example shown in Figure 5, 0 to 0.2 nanometers.
Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00910443A EP1161696A1 (fr) | 1999-03-10 | 2000-03-10 | Mecanisme de commande de tension pour dispositifs a reseaux de bragg |
AU32660/00A AU3266000A (en) | 1999-03-10 | 2000-03-10 | Tension control mechanism for bragg grating devices |
CA002366011A CA2366011A1 (fr) | 1999-03-10 | 2000-03-10 | Mecanisme de commande de tension pour dispositifs a reseaux de bragg |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12370599P | 1999-03-10 | 1999-03-10 | |
US60/123,705 | 1999-03-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000054082A1 true WO2000054082A1 (fr) | 2000-09-14 |
Family
ID=22410368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2000/000253 WO2000054082A1 (fr) | 1999-03-10 | 2000-03-10 | Mecanisme de commande de tension pour dispositifs a reseaux de bragg |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1161696A1 (fr) |
CN (1) | CN1365449A (fr) |
AU (1) | AU3266000A (fr) |
CA (1) | CA2366011A1 (fr) |
WO (1) | WO2000054082A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001092930A1 (fr) * | 2000-05-31 | 2001-12-06 | Highwave Optical Technologies | Dispositif a fibre optique comprenant un reseau de bragg et des moyens d'accordabilite |
EP1249720A1 (fr) * | 2001-04-09 | 2002-10-16 | Alcatel | Filtre à réseau de Bragg dans un guide d'onde optique |
FR2828940A1 (fr) * | 2001-08-22 | 2003-02-28 | Highwave Optical Tech | Dispositif athermique a fibre optique |
US6807341B2 (en) | 2001-12-06 | 2004-10-19 | Avanex Corporation | Adjustable temperature compensating package for optical fiber devices |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102749725A (zh) * | 2012-07-03 | 2012-10-24 | 华东交通大学 | 光纤光栅的波长精密调谐装置 |
CN102736355A (zh) * | 2012-07-03 | 2012-10-17 | 华东交通大学 | 基于光纤布拉格光栅的可调谐慢光实现装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991010151A1 (fr) * | 1989-12-26 | 1991-07-11 | United Technologies Corporation | Dispositif pour guide d'ondes optique a compensation thermique, a filtre de bragg incorpore |
US5682445A (en) * | 1995-01-09 | 1997-10-28 | Optelecom, Inc. | Strain based optical fiber devices |
US5774619A (en) * | 1996-05-15 | 1998-06-30 | Hughes Electronics Corporation | Precision deformation mechanism and method |
US5841920A (en) * | 1997-03-18 | 1998-11-24 | Lucent Technologies Inc. | Fiber grating package |
US5991483A (en) * | 1998-02-10 | 1999-11-23 | Lucent Technologies Inc. | Optical fiber grating packages |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6055348A (en) * | 1998-09-23 | 2000-04-25 | Lucent Technologies Inc. | Tunable grating device and optical communication devices and systems comprising same |
-
2000
- 2000-03-10 EP EP00910443A patent/EP1161696A1/fr not_active Withdrawn
- 2000-03-10 WO PCT/CA2000/000253 patent/WO2000054082A1/fr active Search and Examination
- 2000-03-10 AU AU32660/00A patent/AU3266000A/en not_active Abandoned
- 2000-03-10 CN CN 00806103 patent/CN1365449A/zh active Pending
- 2000-03-10 CA CA002366011A patent/CA2366011A1/fr not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991010151A1 (fr) * | 1989-12-26 | 1991-07-11 | United Technologies Corporation | Dispositif pour guide d'ondes optique a compensation thermique, a filtre de bragg incorpore |
US5682445A (en) * | 1995-01-09 | 1997-10-28 | Optelecom, Inc. | Strain based optical fiber devices |
US5774619A (en) * | 1996-05-15 | 1998-06-30 | Hughes Electronics Corporation | Precision deformation mechanism and method |
US5841920A (en) * | 1997-03-18 | 1998-11-24 | Lucent Technologies Inc. | Fiber grating package |
US5991483A (en) * | 1998-02-10 | 1999-11-23 | Lucent Technologies Inc. | Optical fiber grating packages |
Non-Patent Citations (1)
Title |
---|
See also references of EP1161696A1 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001092930A1 (fr) * | 2000-05-31 | 2001-12-06 | Highwave Optical Technologies | Dispositif a fibre optique comprenant un reseau de bragg et des moyens d'accordabilite |
FR2809827A1 (fr) * | 2000-05-31 | 2001-12-07 | Highwave Optical Tech | Dispositif a fibre optique comprenant un composant tel qu'un reseau de bragg et des moyens d'accordabilite |
US6836593B2 (en) | 2000-05-31 | 2004-12-28 | Highwave Optical Technologies | Optical fibre comprising a bragg grating and tunability means |
EP1249720A1 (fr) * | 2001-04-09 | 2002-10-16 | Alcatel | Filtre à réseau de Bragg dans un guide d'onde optique |
US6757462B2 (en) | 2001-04-09 | 2004-06-29 | Avanex Corporation | Bragg grating filter optical waveguide device |
FR2828940A1 (fr) * | 2001-08-22 | 2003-02-28 | Highwave Optical Tech | Dispositif athermique a fibre optique |
WO2003019255A1 (fr) * | 2001-08-22 | 2003-03-06 | Highwave Optical Technologies | Dispositif athermique a fibre optique |
US6807341B2 (en) | 2001-12-06 | 2004-10-19 | Avanex Corporation | Adjustable temperature compensating package for optical fiber devices |
Also Published As
Publication number | Publication date |
---|---|
CN1365449A (zh) | 2002-08-21 |
EP1161696A1 (fr) | 2001-12-12 |
CA2366011A1 (fr) | 2000-09-14 |
AU3266000A (en) | 2000-09-28 |
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