WO2001092936A1 - Method and device for encapsulating an optical fibre component - Google Patents
Method and device for encapsulating an optical fibre component Download PDFInfo
- Publication number
- WO2001092936A1 WO2001092936A1 PCT/FR2001/001655 FR0101655W WO0192936A1 WO 2001092936 A1 WO2001092936 A1 WO 2001092936A1 FR 0101655 W FR0101655 W FR 0101655W WO 0192936 A1 WO0192936 A1 WO 0192936A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fiber
- support substrate
- thermosetting material
- drop
- optical fiber
- Prior art date
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 46
- 239000000758 substrate Substances 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 30
- 238000000151 deposition Methods 0.000 claims abstract description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 17
- 239000000919 ceramic Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 229920005989 resin Polymers 0.000 description 18
- 239000011347 resin Substances 0.000 description 18
- 238000010438 heat treatment Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- 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
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
Definitions
- the present invention relates to the field of optical fibers, and in particular optical fibers comprising integrated components.
- Optical fibers with integrated components are destined for great development and many industrial applications in the years to come.
- components are particularly destined to play an important role as a sensor or in telecommunications networks [1].
- such components can be used in the form of frequency filters, such as Bragg gratings [2] or filters for transmission lines [3].
- Bragg grating filters or couplers are examples of components integrated into optical fibers.
- a fiber support for the purpose, for example, of protecting a component, of stabilizing it in temperature [4], [5], [6] or of tuning a filter in wave length -
- the glass brazing requires a special glass whose coefficient of expansion is close to the silica of the fiber with a melting temperature lower than the silica. This technique is therefore very restrictive.
- a Bragg grating Used in a transmission line based on wavelength multiplexing [9], a Bragg grating must have a precise wavelength better than 50 ⁇ m. This precision must take into account the thermal drift of the filter or other environmental factors. The different stages followed by the Bragg grating during its manufacture (registration, effect of the diffusion of hydrogen) do not always make it possible to obtain sufficiently precise control of its wavelength. Each step brings a shift in wavelength marred by a significant uncertainty. Therefore, those skilled in the art know that it is necessary to adjust the wavelength of the Bragg grating, lastly, when fixing the optical fiber integrating the component, on a substrate.
- the adjustment, during the fixing step, of a Bragg grating is based on the linear response of the wavelength with an axial mechanical stress.
- a tensile stress of 1/1000 on the fiber leads to a shift of the Bragg wavelength of +1.2 nm around 1.55 ⁇ m [2].
- a known method for carrying out this adjustment operation consists in using a support making it possible to adjust this constraint. The miniaturization of the support, in fact more complex, is then limited.
- Another known method consists in applying a stress with a bench and to freeze this stress value by using glue on the support or any other fixing means.
- thermosetting epoxy resins are common for fixing optical fibers, especially for this application.
- the support and the bench heated, expand. This leads to a non-reproducible shift in the wavelength of the filter. This phenomenon was observed during bonding of a Bragg grating on a temperature compensation support or on a piezoelectric support.
- the standard deviation of the measured wavelength offsets is 97 ⁇ m. This standard deviation, obtained by baking in the oven, is too large to ensure precise aiming at wavelength.
- thermosetting resins used for fixing the optical fibers can modify the optical function of the component and complicate the handling of the samples (supports taken out of an oven for example ).
- specialists today are not satisfied with the known techniques for fixing fibers, in particular using thermosetting resins, and are actively looking for new solutions.
- the present invention now aims to propose new means for fixing an optical fiber on a support substrate to improve the performance of devices based on optical fibers, in particular optical fibers comprising integrated components.
- An important aim of the present invention is in particular to propose means making it possible to freeze the wavelength of a Bragg grating at a precise value.
- a method for manufacturing a device based on optical fiber in particular an optical fiber comprising an integrated component, consisting in:. depositing at least one drop of thermosetting material on a chosen area of a support substrate,
- thermosetting material a chosen area of an optical fiber
- the polymerization step consists in applying a localized laser beam to the drop of thermosetting material.
- the use of a laser beam to ensure polymerization makes it possible to limit the heating by drop of thermosetting material or resin and to its very close environment, and in particular makes it possible to avoid heating. of the entire support substrate.
- thermosetting material is advantageously an epoxy resin.
- the support substrate is formed from a material having a high thermal resistance.
- the present invention also relates to a system for implementing the above method, as well as the devices thus obtained.
- FIG. 1 appended represents a bench according to the present invention, for fixing fiber on a support substrate by polymerization of a resin using a CO2 laser,
- FIG. 2 represents a device in accordance with the present invention, comprising a support substrate capable of providing thermal compensation for a Bragg grating by assembly with a negative expansion coefficient
- FIG. 3 shows another device in accordance with the present invention based on a support, most of which is unsuitable for polymerization by CO2 laser.
- FIG. 4 represents another variant of a device in accordance with the present invention using an arrangement allowing tuning, by electrical control, of the wavelength of a Bragg grating, and.
- FIG. 5 represents a histogram of the total shift of the wavelength observed on a device in accordance with FIG. 4, after polymerization of the epoxy resin.
- FIG. 1 shows a polymerization bench in accordance with the present invention, suitable for locally heating a fiber support 10, in order to polymerize thermosetting resins 20 used for fixing an optical fiber 30, without heating the assembly of the assembly.
- the support 10 can for example be made of silica.
- the bench illustrated in Figure 1 is designed for bonding components integrated into optical fibers, on a substrate.
- the optical fiber 30 to be fixed is plated on the substrate 10.
- a drop of thermosetting resin 20 is placed on the substrate and coats the fiber 30.
- the resin 20 is polymerized by means of a laser 40.
- the beam 42 coming from the laser 40 may or may not be focused by a lens 44, on the resin 20.
- the localized absorption of the laser radiation by the support 10 causes the heating necessary to reach the polymerization temperature of the resin 20.
- the support 10 must have a sufficiently high thermal resistance to avoid thermal propagation in the support and thus avoid a general heating of the support 10, likely to be a source of disturbance for the optical function.
- metal substrates are to be banned.
- the substrate 10 can be produced for example based on ceramic or glass.
- the process according to the present invention uses a thermosetting resin as a fixing means and a polymerization thereof by laser heating. This process allows localized firing of the support to polymerize the glue without heating the entire support, a source of non-reproducible shift in wavelength.
- FIG. 2 shows the case of a temperature stabilization support 10, on which an optical fiber 30 is fixed at two points 32, 34, spaced along its length.
- the thermal stabilization function is provided by an assembly 10 whose coefficient of equivalent thermal expansion between the 2 fixing points 32 and 34, serves to counterbalance the thermal response of the filter integrated on the fiber 30.
- the support 10 consists of 2 elements 12, 16 formed using different materials.
- a first element 12 has the general shape of an L, comprising a base 13 provided at one end with a protrusion 14 on which is fixed a first zone of the fiber 30 at a point 32.
- the second element 16, fixed on the base 13, is generally symmetrical with the protrusion 14 and receives the fiber 30 at the second attachment point 34.
- the material composing the first element 12 has a lower coefficient of expansion than the material composing the second element 16.
- the material 16 can typically be aluminum, while the material
- the 12 is typically a material of low thermal expansion, for example a ceramic or a glass ceramic.
- thermosetting resin 32, 34 is deposited respectively on the protrusion 14 and on the element 16, the fiber under controlled traction is brought into contact with these drops of resin, then the resin 32, 34 is polymerized. More specifically, the drop 34 carried by the element 16 is polymerized first using any suitable means, then the drop 32 carried by the protrusion 14 is polymerized by localized heating with the laser, preferably a CO2 laser. The location of the heat source combined with the characteristic of the material
- the element 12 may be metallic, subject to depositing on this element 12, at the connection zone 32, a ceramic or glass plate (or equivalent) 18 (as has been illustrated in figure 3).
- a ceramic or glass plate (or equivalent) 18 as has been illustrated in figure 3. The results obtained are indicated, for the 2 types of assembly corresponding respectively to FIGS. 2 and 3, in tables 1 and 2 below.
- the support 10 can be formed from a piezoelectric material to allow tuning in wavelength by electrical control.
- the device comprises a support substrate 10 formed from a piezoelectric ceramic which carries an optical fiber 30 fixed to the substrate 10 by two drops of polymerized resin 32, 34.
- the fiber 30 being fixed at the 2 ends 32 and 34, when an electrical voltage is applied to the terminals of the cables 19 driving the piezo ceramic electric, the wavelength of the Bragg grating carried by the fiber 30 is shifted by mechanical traction.
- plates 18 of ceramic glass can be inserted between the bonding point 32, 34 and the piezo ceramic 10.
- FIG. 4 thus illustrates a device in accordance with the present invention comprising a support substrate 10 formed from a piezoelectric ceramic which carries two plates 18 of ceramic glass, which themselves carry an optical fiber 30 fixed on the plates 18 by two drops of polymerized resin 32, 34.
- the wavelength shift observed on a device according to the present invention thus formed of the type illustrated in FIG. 4, is in this case included in a range of 70 ⁇ m.
- the result is shown in Figure 5 in the form of a histogram.
- the present invention is not limited to the particular application variants described above, but can find application in general to all integrated components for which the axial stress on the fiber must be adjusted to a precise value.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Optical Couplings Of Light Guides (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU74140/01A AU7414001A (en) | 2000-05-29 | 2001-05-29 | Method and device for encapsulating an optical fibre component |
EP01940619A EP1290478A1 (en) | 2000-05-29 | 2001-05-29 | Method and device for encapsulating an optical fibre component |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/06826 | 2000-05-29 | ||
FR0006826A FR2809500B1 (en) | 2000-05-29 | 2000-05-29 | METHOD AND DEVICE FOR PACKAGING FIBER OPTIC COMPONENT |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001092936A1 true WO2001092936A1 (en) | 2001-12-06 |
Family
ID=8850706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/001655 WO2001092936A1 (en) | 2000-05-29 | 2001-05-29 | Method and device for encapsulating an optical fibre component |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1290478A1 (en) |
AU (1) | AU7414001A (en) |
FR (1) | FR2809500B1 (en) |
WO (1) | WO2001092936A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6340868A (en) * | 1986-08-05 | 1988-02-22 | Mitsubishi Electric Corp | Optical integration spectrum analyser |
EP0428049A2 (en) * | 1989-11-08 | 1991-05-22 | Fujitsu Limited | Connecting method between waveguide substrate and optical fiber |
US5042898A (en) * | 1989-12-26 | 1991-08-27 | United Technologies Corporation | Incorporated Bragg filter temperature compensated optical waveguide device |
US5402511A (en) * | 1993-06-11 | 1995-03-28 | The United States Of America As Represented By The Secretary Of The Army | Method of forming an improved tapered waveguide by selectively irradiating a viscous adhesive resin prepolymer with ultra-violet light |
US5682453A (en) * | 1994-04-18 | 1997-10-28 | Gould Electronics Inc. | Method of securing optical fiber components, devices and fibers to the same or to mounting fixtures |
US6044189A (en) * | 1996-12-03 | 2000-03-28 | Micron Optics, Inc. | Temperature compensated fiber Bragg gratings |
-
2000
- 2000-05-29 FR FR0006826A patent/FR2809500B1/en not_active Expired - Fee Related
-
2001
- 2001-05-29 EP EP01940619A patent/EP1290478A1/en not_active Withdrawn
- 2001-05-29 AU AU74140/01A patent/AU7414001A/en not_active Abandoned
- 2001-05-29 WO PCT/FR2001/001655 patent/WO2001092936A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6340868A (en) * | 1986-08-05 | 1988-02-22 | Mitsubishi Electric Corp | Optical integration spectrum analyser |
EP0428049A2 (en) * | 1989-11-08 | 1991-05-22 | Fujitsu Limited | Connecting method between waveguide substrate and optical fiber |
US5042898A (en) * | 1989-12-26 | 1991-08-27 | United Technologies Corporation | Incorporated Bragg filter temperature compensated optical waveguide device |
US5402511A (en) * | 1993-06-11 | 1995-03-28 | The United States Of America As Represented By The Secretary Of The Army | Method of forming an improved tapered waveguide by selectively irradiating a viscous adhesive resin prepolymer with ultra-violet light |
US5682453A (en) * | 1994-04-18 | 1997-10-28 | Gould Electronics Inc. | Method of securing optical fiber components, devices and fibers to the same or to mounting fixtures |
US6044189A (en) * | 1996-12-03 | 2000-03-28 | Micron Optics, Inc. | Temperature compensated fiber Bragg gratings |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 012, no. 249 (P - 730) 14 July 1988 (1988-07-14) * |
Also Published As
Publication number | Publication date |
---|---|
FR2809500B1 (en) | 2003-09-26 |
FR2809500A1 (en) | 2001-11-30 |
EP1290478A1 (en) | 2003-03-12 |
AU7414001A (en) | 2001-12-11 |
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