CN103616742A - Method for fabricating chirped fiber grating - Google Patents
Method for fabricating chirped fiber grating Download PDFInfo
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- CN103616742A CN103616742A CN201310670826.4A CN201310670826A CN103616742A CN 103616742 A CN103616742 A CN 103616742A CN 201310670826 A CN201310670826 A CN 201310670826A CN 103616742 A CN103616742 A CN 103616742A
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Abstract
The invention relates to a method for fabricating a chirped fiber grating. A fiber grating with a uniform cycle is encapsulated by adopting a polymer; non-uniform stress distribution changing along the axial direction is formed on the internal part of the polymer by the measures such as high-temperature solidification, room-temperature solidification, low-temperature aging and the like in the fabrication process. The non-uniform stress is applied to the uniform cycle fiber grating so as to generate strain in axial non-uniform cycle distribution, and also simultaneously generate an effective refractive index in the non-uniform cycle distribution, so that the chirped fiber grating is fabricated. Meanwhile, the naked fiber in a fiber grating lattice is encapsulated through the polymer in the fabrication process; the prepared chirped fiber grating does not include a naked fiber area, and great convenience is supplied for practical application of the chirped fiber grating. Therefore, the method has important application value in the field of fabrication of the chirped fiber grating.
Description
Technical field
The invention belongs to Fabrication Methods of Fiber Gratings field, be specifically related to a kind of method for making of chirped fiber grating.
Background technology
Chirped fiber grating is a kind of important fiber optics device components and parts.The grid cycle of chirped fiber grating or effective refractive index are inhomogeneous, cause the difference place reflection wavelength difference along grating length, can be used for realizing dispersion compensation, so chirped fiber grating have a wide range of applications in optical fiber communication and fiber optics equipment.
Chirped fiber grating is generally by two class methods producing principles: the first kind, adopt the inhomogeneous grating cycle, and the grid cycle of fiber grating is with length variations; Equations of The Second Kind, adopts inhomogeneous effective refractive index, and the grid cycle of fiber grating is uniformly, but the effective refractive index depth of modulation of waveguide medium in grid cycle is with length variations.Current chirped fiber grating method for making has: re-expose method, bending method, slant optical fiber method, tapered optical fiber meridional stress method, tapered fibre core method, temperature gradient method, compound chirp grating method etc.Yet for chirped fiber grating, these method for makings are complicated, and manufacture craft is hard to tackle.In addition, conventionally chirped fiber grating needs to remove fibre cladding in manufacturing process, cause making complete chirped fiber grating and have naked fibre in grid region, cause frangible in actual use, it is very inconvenient to use, and all these problems are all the problems that the development of restriction chirped fiber grating and application must be faced.
Summary of the invention
The object of the present invention is to provide a kind of method for making of chirped fiber grating of novelty, to overcome the deficiency of prior art.
The present invention considers that the method for making of uniform period fiber grating and technique are comparatively ripe, and with low cost, therefore utilize after the method for making of ripe uniform period fiber grating and technique produces uniform period fiber grating, again by polymer encapsulated uniform fiber grating, effectively to protect naked fine region, simultaneously in polymer encapsulated process, by controlling packaging technology, the inner unequal stress changing vertically that produces of polymkeric substance is distributed, when this unequal stress puts on uniform period fiber grating, both produced the strain of axial non-homogeneous period profile, produce again the equivalent refractive index of non-homogeneous period profile simultaneously, thereby realized being successful of chirped fiber grating.Because this chirped fiber grating does not exist naked fibre, this practical application that is chirped fiber grating provides very big facility.
Technical scheme of the present invention comprises the following steps:
Step 1: the uniform period fiber grating (1) that is L by the naked fine length in existing grid zone is connected with fiber coupler (10), wideband light source (12) and spectrometer (11), and measure the reflectance spectrum centre wavelength numerical value W of this fiber grating (1) under free straight configuration;
Step 2: according to naked fine length L, making a length with metallic aluminium is the cylindrical body mould (3) that 1.5L, internal diameter are 10～15mm, and setting center at cylindrical body mould (3) two ends again has the treadmill of through hole (4); And make a fixed flat planar (5) that length is 4L, the wide 80～100mm of being with metallic aluminium, cylindrical body mould (3) is fixed on fixed flat planar (5);
Step 3: the central through hole by fiber grating described in step 1 (1) through treadmill (4), and be positioned at the shaft centre line of cylindrical body mould (3), and fixed flat planar (5) is fixed on by optical fiber stationary fixture (6) in fiber grating (1) one end, fiber grating (1) other end is fixed on fixed flat planar (5) by screw-thread micrometer (7);
Step 4: regulate described screw-thread micrometer (7) to both sides, to pull fiber grating (1) so that it is applied to tension force, and with the reflection peak centre wavelength of spectrometer (11) Real-Time Monitoring fiber grating (1); When described in spectrometer (11) detects reflection peak centre wavelength numeric ratio step 1 during the large 10-4 of W numerical value, screw-thread micrometer (7) stops stretching, and the optical fiber after then stretching by optical fiber stationary fixture (13) is fixing, then removes screw-thread micrometer (7);
Step 5: by polymkeric substance and corresponding hardening agent in proportion 10:1 join glue and be heated to molten condition, and the eliminating bubble that stirs in heating process; Then the polymkeric substance of described molten condition is slowly poured in above-mentioned cylindrical body mould (3), to being full of mould completely;
Step 6: fixed flat planar (5) is put into the hot setting that incubator carries out 80-100 degree, and the hot setting time is 1-2 hour; After hot setting finishes, from incubator, take out fixed flat planar (5), optical fiber stationary fixture (6) is removed, put at room temperature and solidify, the cold curing time is 1-2 hour;
Step 7: fixed flat planar (5) is put into the low temperature aging that incubator carries out 50-60 degree, digestion time is at 10-15 hour, low temperature aging finishes rear taking-up fixed flat planar (5), disconnect optical fiber pad 9, remove optical fiber stationary fixture (13), die sinking is also taken out the fiber grating (1) after encapsulation, has obtained chirped fiber grating.
The uniform period fiber grating (1) of described step 1 is Fiber Bragg Grating FBG.
The described polymkeric substance of described step 5 is epoxy polyurethane, and described hardening agent is isocyanate curing agent.
Described step 3 and 4 optical fiber stationary fixture (6), optical fiber stationary fixture (13) and and screw-thread micrometer (7) and stationary platform (5) between be fixedly connected with.
In above-mentioned steps 5 to 7 processes, spectrometer (11) and wideband light source (12) power up work, and the reflection peak data of Real-Time Monitoring fiber grating (1), to guarantee that in encapsulation process, fiber grating reflection spectral line is normal, prevent the unexpected stressed fracture of fiber grating.
The present invention is not that whole process applies tension force to fiber grating in manufacturing process, only in the hot setting stage, fiber grating is applied to tension force, polymkeric substance is converted to solid-state by molten condition; Then in the cold curing stage, the tension force that is applied to fiber grating two ends is discharged, the temperature contrast of high temperature and room temperature is at the inner stress that produces of polymkeric substance, and change along fiber axis to the non-homogeneous cycle, both produce the strain of axial non-homogeneous period profile, produced the equivalent refractive index of non-homogeneous period profile simultaneously; Then by low temperature aging measure, this polymkeric substance internal stress is consolidated, thereby made chirped fiber grating.
The present invention is the method acquisition chirped fiber grating by polymer encapsulated uniform period fiber grating, provides the effective protection to naked fine region by encapsulation simultaneously.Because the manufacture craft of uniform period fiber grating is full-fledged, with low cost, thereby greatly facilitate to making chirped fiber grating.
Below in conjunction with drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is manufacturing process equipment therefor schematic diagram of the present invention.
Fig. 2 is the reflection spectrogram of uniform period fiber grating before polymer encapsulated.
Fig. 3 is the reflection spectrogram of the chirped fiber grating made of the present invention.
In figure, 1. fiber grating, 2. polymkeric substance, 3. cylindrical body mould, 4. treadmill, 5. fixed flat planar, 6. stationary fixture, 7. screw-thread micrometer, 8. tail optical fiber, 9. fusion point, 10. fiber coupler, 11. spectrometers, 12. wideband light sources, 13. stationary fixtures, 14. tail optical fibers.
Embodiment
Embodiment
As shown in Figure 1, the step of the method comprises the present embodiment manufacturing process equipment therefor:
Step 1: adopt conventional phase-mask method to make a bragg grating, the length of measuring this bragg grating grid Luo Xian district after making is 30mm; The tail optical fiber of above-mentioned fiber grating (1) (8) is located to be connected with fiber coupler (10), wideband light source (12) and spectrometer (11) at optical fiber fusion welding point (9); After connecting, wideband light source (12) and spectrometer (11) power up work, measure the reflection spectrogram of this bragg grating (1) under free straight configuration, and as shown in Figure 2, its reflection peak centre wavelength numerical value is 1549.936nm to result.
Step 2: making a length with metallic aluminium is that 45mm, internal diameter are the cylindrical body mould (3) of Φ 12mm.These cylindrical body mould (3) two ends are provided with the treadmill (4) of center Φ 1.0mm through hole, and this treadmill (4) is fixed on cylindrical body mould (3) two ends by screw; Again with length of the making such as metallic aluminium be 120mm, wide be the fixed flat planar of 90mm (5), cylindrical body mould (3) is fixed on fixed flat planar (5).
Step 3: above-mentioned fiber grating (1) is fixed on to the center of cylindrical body mould (3) through the central through hole of treadmill (4), fixed flat planar (5) is fixed on by optical fiber stationary fixture (6) in fiber grating (1) one end, and fiber grating (1) other end is fixed on fixed flat planar (5) by screw-thread micrometer (7).
Step 4: adjustable screw micrometer (7) pulls fiber grating (1) so that it is applied to tension force to both sides, the reflection peak centre wavelength of spectrometer (11) Real-Time Monitoring fiber grating (1).When spectrometer (11) detects reflection peak centre wavelength numerical value and is 1550.091nm, screw-thread micrometer (7) stops stretching, and the optical fiber after stretching by optical fiber stationary fixture (13) is fixing, then removes screw-thread micrometer (7).
Step 5: epoxy polyurethane material and isocyanate curing agent are joined to glue and are heated to molten condition in 10:1 ratio, and the eliminating bubble that stirs in heating process, also can further adopt vacuum pump to absorb bubble.Then the polyurethane material of described molten condition is slowly poured in above-mentioned mould, be full of cylindrical body mould (3) completely, casting process is wanted slowly, to prevent bubble formation.
Step 6: fixed flat planar (5) is put into the hot setting that incubator carries out 90 degree together with cylindrical body mould (3) being fixed thereon etc., and the hot setting time is 2 hours; After hot setting finishes, from incubator, take out fixed flat planar (5), optical fiber stationary fixture (6) is removed, be placed under the room temperature that temperature is 18 degree and solidify, the cold curing time is 2 hours.
Step 7: again fixed flat planar (5) is put into the low temperature aging that incubator carries out 60 degree together with cylindrical body mould (3) being fixed thereon etc., the reflectance spectrum data of spectrometer (11) Real-Time Monitoring fiber grating (1), the low temperature aging time is 12 hours.Low temperature aging finishes rear disconnection optical fiber pad 9, removes optical fiber stationary fixture (13), and die sinking is also taken out the fiber grating after encapsulation, has obtained chirped fiber grating.
The reflectance spectrum data of the chirped fiber grating that the present embodiment is made as shown in Figure 3, can realize the dispersion compensation of different wave length.There is not naked fine region in the chirped fiber grating that the present embodiment completes, for the practical application of chirped fiber grating provides very big facility.
Although describe the present invention in detail with reference to above-described embodiment, should be appreciated that the present invention is not limited to the disclosed embodiments, for the technician of this professional domain, can carry out various changes to its form and details.
Claims (4)
1. a method for making for chirped fiber grating, is characterized in that, the step of the method is as follows:
Step 1: the uniform period fiber grating (1) that is L by the naked fine length in existing grid zone is connected with fiber coupler (10), wideband light source (12) and spectrometer (11), and measure the reflectance spectrum centre wavelength numerical value W of this fiber grating (1) under free straight configuration;
Step 2: according to naked fine length L, making a length with metallic aluminium is the cylindrical body mould (3) that 1.5L, internal diameter are 10～15mm, and setting center at cylindrical body mould (3) two ends again has the treadmill of through hole (4); And make a fixed flat planar (5) that length is 4L, the wide 80～100mm of being with metallic aluminium, above-mentioned cylindrical body mould (3) is fixed on fixed flat planar (5);
Step 3: the central through hole by fiber grating described in step 1 (1) through treadmill (4), and be positioned at the shaft centre line of cylindrical body mould (3), and fixed flat planar (5) is fixed on by optical fiber stationary fixture (6) in fiber grating (1) one end, fiber grating (1) other end is fixed on fixed flat planar (5) by screw-thread micrometer (7);
Step 4: regulate described screw-thread micrometer (7) to both sides, to pull fiber grating (1) so that it is applied to tension force, and with the reflection peak centre wavelength of spectrometer (11) Real-Time Monitoring fiber grating (1); When described in spectrometer (11) detects reflection peak centre wavelength numeric ratio step 1 during the large 10-4 of W numerical value, screw-thread micrometer (7) stops stretching, and the optical fiber after then stretching by optical fiber stationary fixture (13) is fixing, then removes screw-thread micrometer (7);
Step 5: by polymkeric substance and corresponding hardening agent in proportion 10:1 join glue and be heated to molten condition, and the eliminating bubble that stirs in heating process; Then the polymkeric substance of described molten condition is slowly poured in above-mentioned cylindrical body mould (3), to being full of mould completely;
Step 6: fixed flat planar (5) is put into the hot setting that incubator carries out 80-100 degree, and the hot setting time is 1-2 hour; After hot setting finishes, from incubator, take out fixed flat planar (5), optical fiber stationary fixture (6) is removed, put at room temperature and solidify, the cold curing time is 1-2 hour;
Step 7: fixed flat planar (5) is put into the low temperature aging that incubator carries out 50-60 degree, digestion time is at 10-15 hour, low temperature aging finishes rear taking-up fixed flat planar (5), disconnect optical fiber pad 9, remove optical fiber stationary fixture (13), die sinking is also taken out the fiber grating (1) after encapsulation, has obtained chirped fiber grating.
2. the method for making of a kind of chirped fiber grating as claimed in claim 1, is characterized in that described uniform period fiber grating (1) is Fiber Bragg Grating FBG.
3. the method for making of a kind of chirped fiber grating as claimed in claim 1, is characterized in that described polymkeric substance is epoxy polyurethane.
4. the method for making of a kind of chirped fiber grating as claimed in claim 1, is characterized in that described hardening agent is isocyanate curing agent.
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| CN201310670826.4A CN103616742B (en) | 2013-12-11 | 2013-12-11 | Method for fabricating chirped fiber grating |
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| CN201310670826.4A CN103616742B (en) | 2013-12-11 | 2013-12-11 | Method for fabricating chirped fiber grating |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105583484A (en) * | 2015-12-16 | 2016-05-18 | 北京遥测技术研究所 | Optical fiber sensor glue-free packaging device and method |
| CN105973159A (en) * | 2016-05-25 | 2016-09-28 | 中石化石油工程设计有限公司 | Initial strain control apparatus for distributed fiber sensor of pipe and control method thereof |
| CN106482760A (en) * | 2015-10-14 | 2017-03-08 | 北京信息科技大学 | A kind of system of all-metal packaged fiber grating strain transducer |
| CN107687817A (en) * | 2017-07-20 | 2018-02-13 | 北京航天控制仪器研究所 | One kind miniaturization flexible optical fibre grating strain transducer |
| CN108680289A (en) * | 2018-05-24 | 2018-10-19 | 大连理工大学 | A kind of method that polyurethane encapsulation fiber grating prepares sensor |
| CN110320590A (en) * | 2019-05-17 | 2019-10-11 | 浙江工业大学 | A kind of production method of machinery chirp long period optic fiber grating |
| CN112068238A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Single stress element optical fiber chirped fiber Bragg grating and preparation method thereof |
| CN112068237A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Cascade multi-type grating based on single stress element optical fiber and preparation method thereof |
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| CN1397813A (en) * | 2002-08-30 | 2003-02-19 | 清华大学 | Process for preparing high-chip optical fibre raster with controllable transmission (reflection) |
| CN1811503A (en) * | 2006-03-03 | 2006-08-02 | 清华大学 | Method for producing non-linear chirp optical fibre grating for 40 Gb/S optical communication system |
| CN102122023A (en) * | 2011-04-14 | 2011-07-13 | 暨南大学 | Method for manufacturing tunable chirped fiber grating |
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2013
- 2013-12-11 CN CN201310670826.4A patent/CN103616742B/en not_active Expired - Fee Related
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482760A (en) * | 2015-10-14 | 2017-03-08 | 北京信息科技大学 | A kind of system of all-metal packaged fiber grating strain transducer |
| CN106482760B (en) * | 2015-10-14 | 2018-09-21 | 北京信息科技大学 | A kind of system of all-metal packaged fiber grating strain transducer |
| CN105583484A (en) * | 2015-12-16 | 2016-05-18 | 北京遥测技术研究所 | Optical fiber sensor glue-free packaging device and method |
| CN105973159A (en) * | 2016-05-25 | 2016-09-28 | 中石化石油工程设计有限公司 | Initial strain control apparatus for distributed fiber sensor of pipe and control method thereof |
| CN107687817A (en) * | 2017-07-20 | 2018-02-13 | 北京航天控制仪器研究所 | One kind miniaturization flexible optical fibre grating strain transducer |
| CN107687817B (en) * | 2017-07-20 | 2019-11-29 | 北京航天控制仪器研究所 | A kind of miniaturization flexible optical fibre grating strain transducer |
| CN108680289A (en) * | 2018-05-24 | 2018-10-19 | 大连理工大学 | A kind of method that polyurethane encapsulation fiber grating prepares sensor |
| CN110320590A (en) * | 2019-05-17 | 2019-10-11 | 浙江工业大学 | A kind of production method of machinery chirp long period optic fiber grating |
| CN112068238A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Single stress element optical fiber chirped fiber Bragg grating and preparation method thereof |
| CN112068237A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Cascade multi-type grating based on single stress element optical fiber and preparation method thereof |
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| CN103616742B (en) | 2015-06-17 |
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