CN104849800A - Method for side imaging and automatic alignment positioning of panda-type polarization-maintaining optical fiber - Google Patents
Method for side imaging and automatic alignment positioning of panda-type polarization-maintaining optical fiber Download PDFInfo
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- CN104849800A CN104849800A CN201510311873.9A CN201510311873A CN104849800A CN 104849800 A CN104849800 A CN 104849800A CN 201510311873 A CN201510311873 A CN 201510311873A CN 104849800 A CN104849800 A CN 104849800A
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- type polarization
- polarization
- panda
- optical fiber
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- 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
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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- 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
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/021—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape
- G02B6/02109—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape having polarization sensitive features, e.g. reduced photo-induced birefringence
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a method for the side imaging and automatic alignment positioning of a panda-type polarization-maintaining optical fiber, and the method comprises the steps: firstly enabling the panda-type polarization-maintaining optical fiber to be installed on a rotatable fiber-fixing clamping tool; enabling a laser to emit parallel light which is irradiated from one side surface to the panda-type polarization-maintaining optical fiber, wherein the other side of the panda-type polarization-maintaining optical fiber is provided with an observation surface; collecting the light intensity distribution of the observation surface; rotating the panda-type polarization-maintaining optical fiber, so as to obtain the light intensity distribution of the observation surface under the conditions of different polarization axis azimuth angles; plotting characteristic curves of polarization axis azimuth angles and the light intensity distribution of the observation surface; obtaining two azimuths according to two minimal value points of light intensity distribution when the slow axis of the polarization axis of the panda-type polarization-maintaining optical fiber and the parallel light emitted by the laser form a 45-degree angle; and determining the azimuth of the polarization axis of the panda-type polarization-maintaining optical fiber. The method provided by the invention does not need the longitudinal observation of the cross section of the panda-type polarization-maintaining optical fiber, is simple in operation, shortens the positioning time of the azimuth of the polarization axis of the panda-type polarization-maintaining optical fiber, and is accurate in positioning.
Description
Technical field
The invention belongs to fiber grating and make field, particularly relate to a kind of panda type polarization-preserving fiber image side faces and aim at the method for locating with robotization.
Background technology
panda type polarization-preserving fiber, when inscribing grating, for Ultra-Violet Laser avoids stressed zone, requires that the slow axis of panda type polarization-preserving fiber is perpendicular to optical axis.For meeting this requirement, current method utilizes laser beam irradiation optical fiber side-looking imaging, record the light intensity characteristic of this image, then cutting optical fibre, with CCD vertical relations fiber cross-sections, the corresponding angle of spin fiber is to the orientation of slow axis perpendicular to optical axis afterwards, again records the light intensity characteristic of image, rotates and record light distribution thereafter every 5 °.Like this, the position angle of slow axis perpendicular to optical axis of panda type polarization-preserving fiber is obtained by comparison.This way is comparatively time-consuming, and need repeatedly cut, production efficiency is low.
Summary of the invention
The present invention is directed to the problems of the prior art, a kind of panda type polarization-preserving fiber image side faces is provided to aim at the method for locating with robotization, the method is without the need to vertical relations optical fiber square section, simple to operate, the positioning time in panda type polarization-preserving fiber polarization axle orientation is shortened, accurate positioning, yield rate is high.
The technical solution adopted for the present invention to solve the technical problems is: a kind of panda type polarization-preserving fiber image side faces aims at the method for locating with robotization, comprise the following steps, step one, panda type polarization-preserving fiber is arranged on rotatable optical fiber stationary fixture, laser instrument sends directional light, be radiated at panda type polarization-preserving fiber from the side side direction of panda type polarization-preserving fiber, the central axis upright of this directional light and panda type polarization-preserving fiber, inspection surface is set at panda type polarization-preserving fiber opposite side, gathers the light distribution on inspection surface; Step 2, rotates panda type polarization-preserving fiber, under obtaining different polarization axle position angle situation, and the light distribution on inspection surface; Axle through center, panda type polarization-preserving fiber two stressed zones is called the slow axis of polarization axle, and the angle of slow axis and directional light is defined as polarization axle position angle.Step 3, make the characteristic curve of the light distribution on polarization axle position angle and inspection surface, according to 2 light distribution minimum points, obtain the slow axis of panda type polarization-preserving fiber polarization axle and laser instrument send out directional light direction at 45 ° time two orientation, determine the orientation of panda type polarization-preserving fiber polarization axle.
By technique scheme, in described step one, laser instrument is helium-neon laser.
By technique scheme, in described step 2, the light distribution on inspection surface, is obtained by ccd video camera.
By technique scheme, optical fiber stationary fixture makes panda type polarization-preserving fiber rotate around the central axis of this optical fiber itself.
By technique scheme, in described step 2, between different polarization axle position angle 5 °, interval.
The beneficial effect that the present invention produces is: without the need to the optical fiber square section of vertical relations panda type polarization-preserving fiber, simple to operate, shortened, accurate positioning the positioning time in panda type polarization-preserving fiber polarization axle orientation, in the process making panda polarization-maintaining fiber Bragg grating, improve yield rate.Can be used for making single grid, double grid, multiple-grid, apodization type panda polarization-maintaining fiber Bragg grating.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is embodiment of the present invention panda type polarization-preserving fiber image side faces aims at localization method positioning system schematic diagram with robotization;
Fig. 2 is ccd video camera pixel schematic diagram respectively;
Fig. 3 be on inspection surface light intensity eigenwert and angle count between corresponding relation curve;
Fig. 4 be the slow axis of panda type polarization-preserving fiber polarization axle and laser instrument send out directional light direction at 45 ° time first party parallactic angle schematic diagram;
Fig. 5 be the slow axis of panda type polarization-preserving fiber polarization axle and laser instrument send out directional light direction at 45 ° time second party parallactic angle schematic diagram.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In the embodiment of the present invention, a kind of panda type polarization-preserving fiber image side faces is provided to aim at the method for locating with robotization, comprise the following steps, step one, be arranged on by panda type polarization-preserving fiber on rotatable optical fiber stationary fixture, laser instrument sends directional light, be radiated at panda type polarization-preserving fiber from the side side direction of panda type polarization-preserving fiber, the central axis upright of this directional light and panda type polarization-preserving fiber, arranges inspection surface at panda type polarization-preserving fiber opposite side, gathers the light distribution on inspection surface; Step 2, rotates panda type polarization-preserving fiber, under obtaining different polarization axle position angle situation, and the light distribution on inspection surface; Axle through center, panda type polarization-preserving fiber two stressed zones is called the slow axis of polarization axle, and the angle of slow axis and directional light is defined as polarization axle position angle.Step 3, make the characteristic curve of the light distribution on polarization axle position angle and inspection surface, according to 2 light distribution minimum points, obtain the slow axis of panda type polarization-preserving fiber polarization axle and laser instrument send out directional light direction at 45 ° time two orientation, determine the orientation of panda type polarization-preserving fiber polarization axle.
Wherein, in described step one, laser instrument is helium-neon laser.
Further, in described step 2, the light distribution on inspection surface, is obtained by ccd video camera.
Further, optical fiber stationary fixture makes panda type polarization-preserving fiber rotate around the central axis of this optical fiber itself.
Wherein, in described step 2, between different polarization axle position angle 5 °, interval.
In preferred embodiment of the present invention, panda type polarization-preserving fiber image side faces is aimed at the method for locating and is specifically comprised the steps: with robotization
(1) grid optics equipment is write in adjustment, and the collimated laser beam that helium-neon laser (wavelength 532 nm) is sent and panda type polarization-preserving fiber are in same level, as shown in Figure 1.
(2) collimated laser beam is irradiated to from side and removes the panda type polarization-preserving fiber of coat, at panda type polarization-preserving fiber opposite side, obtains the side elevation image of panda type polarization-preserving fiber in the inspection surface vertical with collimated laser beam.
(3) ccd video camera of adjustment belt camera lens, makes side elevation image clearly be presented on ccd video camera, and is sent to computing machine.
(4) side elevation image shown by ccd video camera is 1280*1024 pixel, the light intensity value of each pixel is from 0 to 255, horizontal boost line and vertical each 2 of boost line is made at the middle part of side elevation image, article 2, comprise 200 pixels in horizontal boost line, article 2, comprise 120 pixels in vertical boost line, as shown in Figure 2, calculate light distribution to be only limitted in longitudinal boost line.
(5) when calculating light intensity, light intensity in horizontal boost line is multiplied by rejection coefficient a=2, and all the other region light intensity are multiplied by rejection coefficient b=1, and addition obtains the light intensity characteristic value under this polarization axle position angle, namely in the situation of different polarization axle position angle, the light distribution on inspection surface.
(6) the left and right two ends of optical fiber stationary fixture arrange universal stage respectively, 2 universal stages rotate panda type polarization-preserving fiber by the speed sync of 5 °/step, until rotate to 180 ° from 0 °, the light intensity characteristic value that corresponding panda type polarization-preserving fiber often rotates 5 ° is obtained, i.e. totally 37 eigenwerts by (5).Obtain thus light intensity eigenwert and 37 angles on inspection surface count between corresponding relation, as shown in Figure 3.
(7) two minimum points are obtained in the relation curve of the light intensity characteristic value obtained by (6) and 37 angles, the slow axis of the corresponding panda type polarization-preserving fiber polarization axles of these two minimum points and laser instrument send out directional light direction at 45 ° time two position angles: first party parallactic angle and second party parallactic angle, as Fig. 4.
(8), after finding two 45 ° of position angles, rotate panda type polarization-preserving fiber 45 °, the slow axis namely obtaining panda type polarization-preserving fiber polarization axle and laser instrument send out the position that directional light direction parallels.
The grating of above-mentioned panda type polarization-preserving fiber is Bragg grating.The grating of panda type polarization-preserving fiber is the grating of single grid, double grid, multiple-grid, apodization or other types.
The inventive method is when making panda polarization-maintaining fiber Bragg grating, utilize side-looking imaging accurately to determine the polarization axle of polarization maintaining optical fibre, dead axle precision is accurate, and efficiency is high, make Ultra-Violet Laser to avoid stressed zone, thus can fast, repeatedly can prepare high-quality panda polarization-maintaining fiber Bragg grating product.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (5)
1. a panda type polarization-preserving fiber image side faces aims at the method for locating with robotization, it is characterized in that, comprise the following steps, step one, panda type polarization-preserving fiber is arranged on rotatable optical fiber stationary fixture, laser instrument sends directional light and is radiated at panda type polarization-preserving fiber from side direction, arranges inspection surface at panda type polarization-preserving fiber opposite side, gathers the light distribution on inspection surface; Step 2, rotates panda type polarization-preserving fiber, under obtaining different polarization axle position angle situation, and the light distribution on inspection surface; Step 3, make the characteristic curve of the light distribution on polarization axle position angle and inspection surface, according to 2 light distribution minimum points, obtain the slow axis of panda type polarization-preserving fiber polarization axle and laser instrument send out directional light direction at 45 ° time two orientation, determine the orientation of panda type polarization-preserving fiber polarization axle.
2. panda type polarization-preserving fiber image side faces according to claim 1 aims at the method for locating with robotization, it is characterized in that, in described step one, laser instrument is helium-neon laser.
3. panda type polarization-preserving fiber image side faces according to claim 1 and 2 aims at the method for locating with robotization, it is characterized in that, in described step 2, the light distribution on inspection surface, is obtained by ccd video camera.
4. panda type polarization-preserving fiber image side faces according to claim 1 and 2 aims at the method for locating with robotization, it is characterized in that, optical fiber stationary fixture makes panda type polarization-preserving fiber rotate around the central axis of this optical fiber itself.
5. panda type polarization-preserving fiber image side faces according to claim 1 and 2 aims at the method for locating with robotization, it is characterized in that, in described step 2, between different polarization axle position angle 5 °, interval.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510311873.9A CN104849800A (en) | 2015-06-09 | 2015-06-09 | Method for side imaging and automatic alignment positioning of panda-type polarization-maintaining optical fiber |
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| CN201510311873.9A CN104849800A (en) | 2015-06-09 | 2015-06-09 | Method for side imaging and automatic alignment positioning of panda-type polarization-maintaining optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888197A (en) * | 2019-12-11 | 2020-03-17 | 北京工业大学 | A polarization-maintaining fiber alignment device based on the far-field pattern of the microstructure inside the fiber |
| CN111964872A (en) * | 2020-07-08 | 2020-11-20 | 暨南大学 | Optical fiber axial nondestructive online detection device and method |
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| WO1995014945A1 (en) * | 1993-11-29 | 1995-06-01 | Telefonaktiebolaget Lm Ericsson | Determination of angular offset between optical fibers having optical, axial asymmetry and alignment and splicing of such fibers |
| CN101833128A (en) * | 2010-03-25 | 2010-09-15 | 西安电子科技大学 | PANDA fiber dead axle method based on light distribution in first-order laser rainbow area |
| CN104238002A (en) * | 2014-09-28 | 2014-12-24 | 北京航空航天大学 | Side-view imaging polarization-maintaining optical fiber axis setting method |
| CN104567737A (en) * | 2014-12-24 | 2015-04-29 | 浙江大学 | Axis determination method of panda-type polarization-maintaining optical fiber end surface |
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2015
- 2015-06-09 CN CN201510311873.9A patent/CN104849800A/en active Pending
Patent Citations (4)
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| WO1995014945A1 (en) * | 1993-11-29 | 1995-06-01 | Telefonaktiebolaget Lm Ericsson | Determination of angular offset between optical fibers having optical, axial asymmetry and alignment and splicing of such fibers |
| CN101833128A (en) * | 2010-03-25 | 2010-09-15 | 西安电子科技大学 | PANDA fiber dead axle method based on light distribution in first-order laser rainbow area |
| CN104238002A (en) * | 2014-09-28 | 2014-12-24 | 北京航空航天大学 | Side-view imaging polarization-maintaining optical fiber axis setting method |
| CN104567737A (en) * | 2014-12-24 | 2015-04-29 | 浙江大学 | Axis determination method of panda-type polarization-maintaining optical fiber end surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888197A (en) * | 2019-12-11 | 2020-03-17 | 北京工业大学 | A polarization-maintaining fiber alignment device based on the far-field pattern of the microstructure inside the fiber |
| CN111964872A (en) * | 2020-07-08 | 2020-11-20 | 暨南大学 | Optical fiber axial nondestructive online detection device and method |
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