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 PDF

Info

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
Application number
PCT/CA2000/000253
Other languages
English (en)
Inventor
Robert Maaskant
Rong Huang
Original Assignee
Jds Uniphase Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jds Uniphase Corporation filed Critical Jds Uniphase Corporation
Priority to EP00910443A priority Critical patent/EP1161696A1/fr
Priority to AU32660/00A priority patent/AU3266000A/en
Priority to CA002366011A priority patent/CA2366011A1/fr
Publication of WO2000054082A1 publication Critical patent/WO2000054082A1/fr

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

La présente invention concerne un mécanisme permettant de commander la tension d'un dispositif à réseau de Bragg avec fibre à onde guidée (12). La tension imposée sur un tel réseau de Bragg (12) peut être exploitée pour en régler les caractéristiques spectrales au gré des besoins. On pourra, par exemple, commander directement la longueur d'onde centrale d'un réseau de Bragg à fibre (12) au moyen de la tension imposée sur la fibre. De même, la tension de la fibre permet, dans le cas d'un réseau comprimé de façon non linéaire, de commander les propriétés effectives de retard groupé. Ces exemples sont en rapport direct avec des applications de détection ainsi qu'avec des filtres de multiplexeur en longueur d'onde (WDM) et des dispositifs de compensation de dispersion. Le mécanisme de commande de tension qui règle les propriétés spectrales d'un réseau de Bragg à fibre (12) comporte une structure support (18) sur laquelle est fixé ledit réseau (12) par une première (20) et une seconde (22) partie. Cette structure (18) possède un mécanisme de réglage (30) qui, selon que le réglage se fait dans un sens ou dans l'autre, augmente ou diminue la tension dans le réseau de Bragg à fibre (12).
PCT/CA2000/000253 1999-03-10 2000-03-10 Mecanisme de commande de tension pour dispositifs a reseaux de bragg WO2000054082A1 (fr)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Title
See also references of EP1161696A1 *

Cited By (8)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
US5841920A (en) Fiber grating package
US6370310B1 (en) Fiber optic grating temperature compensation device and method
US6181851B1 (en) Temperature-compensated optical fiber package
US5991483A (en) Optical fiber grating packages
US6907164B2 (en) Adjustable athermal package for optical fiber devices
US5042898A (en) Incorporated Bragg filter temperature compensated optical waveguide device
US6366721B1 (en) Tunable optical fiber grating
US6144789A (en) Temperature compensating device for fiber gratings and a package therefor
US20040234200A1 (en) Apparatus and method for non-linear thermal compensation of optical waveguide gratings
US6510272B1 (en) Temperature compensated fiber bragg grating
US6493486B1 (en) Thermal compensated compact bragg grating filter
EP1161696A1 (fr) Mecanisme de commande de tension pour dispositifs a reseaux de bragg
US7212707B2 (en) Temperature-compensated fiber grating packaging arrangement
US6295399B1 (en) Non-linear temperature compensating device for fiber gratings and a package therefor
US6807341B2 (en) Adjustable temperature compensating package for optical fiber devices
US6757462B2 (en) Bragg grating filter optical waveguide device
US6853771B2 (en) Apparatus and method for compensation of central wavelength shifting of a fiber grating
US6898002B2 (en) Optical device, optical module, optical amplifier, and optical transmission system
US6839487B2 (en) Athermal, optical-fiber device comprising an integrated component
US6337932B1 (en) Apparatus and method for thermostatic compensation of temperature sensitive devices
EP1279975A1 (fr) Dispositif comprenant une fibre optique possédant un réseau de Bragg accordable par un actuateur piezoélectrique
US20050226555A1 (en) Tuneable optical waveguide grating transmission filter
US20020154862A1 (en) Temperature compensating device for optical fibre gratings
WO2002073268A2 (fr) Compensateur thermique destine a des circuits de communication optiques et similaires
WO2003010577A1 (fr) Boitier a compensation de temperature pour reseaux de fibres optiques

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 00806103.3

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2000910443

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 32660/00

Country of ref document: AU

ENP Entry into the national phase

Ref document number: 2366011

Country of ref document: CA

Ref document number: 2366011

Country of ref document: CA

Kind code of ref document: A

WWP Wipo information: published in national office

Ref document number: 2000910443

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWW Wipo information: withdrawn in national office

Ref document number: 2000910443

Country of ref document: EP

DPE2 Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101)