CN1243996C - Method for manufacturing low double-refraction optical-fiber grating - Google Patents
Method for manufacturing low double-refraction optical-fiber grating Download PDFInfo
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- CN1243996C CN1243996C CN 200310108063 CN200310108063A CN1243996C CN 1243996 C CN1243996 C CN 1243996C CN 200310108063 CN200310108063 CN 200310108063 CN 200310108063 A CN200310108063 A CN 200310108063A CN 1243996 C CN1243996 C CN 1243996C
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Abstract
The present invention relates to a method of making low-birefringence optical fiber gratings. The present invention comprises the following steps: fixing an optical fiber section of an optical fiber to an optical fiber clamp and making the optical fiber section tightly attached to a phase plate; capping a small shade on the optical fiber section; connecting a spectrometer to the forward output end of the optical fiber through an isolator; connecting a fluorescence source to the input end of the optical fiber; switching on an excimer laser to make ultraviolet laser beams of 193 nm emitted by the excimer laser form p polarizing light by a polarizer for ultraviolet light of 193 m; changing the p polarizing light into parallel light by a collimating beam-expanding system; irradiating the parallel light on the optical fiber section by the phase plate and the shade for exposure; making the vibration direction of the p polarizing light parallel to the transmission direction of the optical fiber section; switching on the fluorescence source and the spectrometer for monitoring the formation of optical fiber gratings by the spectrometer; stopping exposure when a required reflective index is achieved to finish the fabrication of the optical fiber gratings. The present invention has the advantages of low birefringence of the fabricated optical fiber gratings and high rate of finished products of 100%.
Description
Technical field:
The present invention relates to fiber grating, particularly a kind of method for making of low birefringent fiber grating.
Background technology
The optical amplifier that wideband gain is smooth is the key element that increases the wave division multiplexing transmission system capacity.In the method for the planarization of many making amplifiers, easy to make, advantages such as back-reflection that spectral shape is flexible and low based on the gain flattening filter of long period fiber grating become very potential element.But still have two large problems to overcome: the one, temperature sensitivity, the 2nd, polarization correlated.
Bibliographical information is arranged, can adopt the method for optic fibre turning to reduce the birefringence of fiber grating.But this method makes fiber grating fracture easily, and serviceable life difficult prospect.
In addition, near green glow (532nm) and near ultraviolet light (248nm) all can cause photic birefringent phenomenon to the exposure of optical fiber, and for the report of ultraviolet light, all are confined near the 248nm.But phosphorus-doped optical fiber or optical waveguide, photosensitivity for the ultraviolet light of 248nm is very poor, and it is better to the photosensitivity of the ultraviolet light of 193nm, but because the wavelength of 193nm is difficult to find suitable Coating Materials to obtain the polarizer of high-polarization and high-transmission rate, so till now, do not see the report that the polarized light that utilizes 193nm is made fiber grating yet.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome the defective of above-mentioned prior art, and a kind of method for making of low birefringent fiber grating is provided, and this method not only requires easy, and yield rate wants high.
Main points of the present invention are to utilize p polarization 193nm Ultra-Violet Laser to make fiber grating, and adopt the method for monitoring in real time to guarantee that the fiber grating of made has the performance of optimization, and yield rate reaches 100%..
Concrete technical solution of the present invention is as follows:
A kind of method for making of low birefringent fiber grating is characterized in that may further comprise the steps:
1, get an optical fiber, wherein a fiber segment is fixed on the fiber clamp, and makes this fiber segment be close to a phase-plate, adds a cover a little shade again on this fiber segment;
2, the forward output terminal of this optical fiber connects a spectrometer by an isolator, input termination one fluorescence source of this optical fiber;
3, opening excimer laser makes the UV laser beam of its 193nm that sends form the p polarized light by the 193nm ultraviolet light polarizer, become directional light through collimating and beam expanding system, be radiated on this fiber segment through phase-plate and shade again, expose, the direction of vibration of this p polarized light is parallel to the transmission direction of this fiber segment;
4, open fluorescence source and spectrometer, the formation by this spectrometer monitoring fiber grating when reaching needed reflectivity, stops exposure, finishes the making of fiber grating.
The described 193nm ultraviolet light polarizer is to be that the drift angle both sides of base of the Brewster angle of the 2 times of 193nm ultraviolet lights quartz plate that is sticked constitutes by a drift angle.
Described optical fiber is silica fibre, before making fiber grating, should place a week in 100 atmospheric hydrogen.
Technique effect of the present invention is as follows:
1, experiment showed, and utilize the inventive method to make fiber grating, yield rate 100%.
2, the fiber grating that utilizes the present invention to make, its birefringence is low, and the birefringence of the fiber grating of making than commonsense method has reduced 5 times at least.
Description of drawings:
Fig. 1 is the structural representation of the ultraviolet light polarizer 4 of the present invention device 193nm of being used for making the low birefringent fiber grating
Fig. 2 is the device synoptic diagram that the present invention is used to make the low birefringent fiber grating.
Fig. 3 is a proving installation of the present invention
Among the figure:
The base of 1-193nm ultraviolet light polarizer; The 2-quartz plate; The 3-excimer laser sends the ultraviolet light beam of 193nm; The 4-193nm ultraviolet light polarizer; 5-ultraviolet light collimating and beam expanding system;
6-is through the ultraviolet light behind the collimator and extender; The 7-shade; The 8-phase-plate;
The fiber grating that 9-is to be made; 10-optical fiber; The 11-fluorescence source; The 12-isolator;
The 13-spectrometer; The 14-fiber clamp; The 15-pumping source; The 16-wavelength division multiplexer;
17-is the F-P interferometer fixedly; The 18-prism; The 19-CCD camera; The 20-watch-dog.
Embodiment
See also Fig. 1, Fig. 2 earlier, Fig. 1 is the structural representation of the ultraviolet light polarizer 4 of the present invention device 193nm of being used for making the low birefringent fiber grating, and Fig. 2 is the device synoptic diagram that the present invention is used to make the low birefringent fiber grating.The ultraviolet light polarizer 4 that the present invention is used for making the device 193nm of low birefringent fiber grating is made of by the drift angle both sides of the base 1 of the Brewster angle of 2 times of 193 ultraviolet light two quartz plates 2 that have been sticked a drift angle.The present invention adopts device shown in Figure 2 to make the low birefringent fiber grating.
The invention will be further described below by embodiment:
The embodiment of the method for making of low birefringent fiber grating of the present invention may further comprise the steps:
1. get an optical fiber 10, wherein a fiber segment 9 is fixed on the fiber clamp 14, makes this fiber segment 9 be close to a phase-plate 8, adds a cover a little shade 7 again on this fiber segment 9;
2. the forward output terminal of this optical fiber 10 connects a spectrometer 13 by an isolator 12, input termination one fluorescence source 11 of this optical fiber 10;
3. opening excimer laser makes the UV laser beam 3 of its 193nm that sends form the p polarized light by the 193nm ultraviolet light polarizer 4, become directional light through ultraviolet light collimating and beam expanding system 5, be radiated on the fiber segment 9 through phase-plate 8 and shade 7 and expose, the direction of vibration of this p polarized light is parallel to the transmission direction of fiber segment 9;
4. open the formation of fluorescence source 11 and spectrometer 13, when reaching needed reflectivity, stop exposure, finish the making of fiber grating by spectrometer 13 monitoring fiber gratings.
Among the embodiment, described optical fiber 10 is Yb that Chinese Wuhan Institute of Post and Telecommunication makes
3+Optical fiber before making fiber grating, should be placed a week in 100 atmospheric hydrogen.
The 193nm laser beam 3 of excimer laser outgoing forms the p polarized light through the 193nm ultraviolet light polarizer 4, becomes directional light 6 by collimating and beam expanding system 5, and the process cycle is the phase-plate 8 of 724nm, is radiated at the Yb that mixes of 10cm length
3+On the fiber segment 9, this fiber segment 9 is close to phase-plate 8.Mix Yb
3+The long altogether 45cm of optical fiber 10.In the centre of the fiber segment 9 of 10cm, block 5mm by shade 7, ultraviolet light can not be seen through.The initial index of refraction that obtains optical fiber for convenience, we at first utilize fluorescence source shown in Figure 2 to monitor the formation of fiber grating.Like this, the most initial bragg wavelength of fiber grating can be noted, thereby the original refractive index of fiber grating can be obtained.
After fiber grating is made, adopt the output characteristics of device to test phase shift distribution feedback optic fiber laser as shown in Figure 3.It is the semiconductor laser of 980nm that the pumping source 15 of this optical fiber adopts wavelength, and pump light is by wavelength division multiplexer 16 pumping Yb
3+Optical fiber 10.The isolator 12 that has all added 1053nm at the forward output and the inverse output terminal of the phase shift distribution feedback optic fiber laser of made is in order to prevent end face reflection.The forward output of laser instrument inserts spectrometer 13, the output wavelength of coming monitoring laser.The light of the inverse output terminal of laser instrument is monitored by monitor 20 by fixing F-P interferometer 17, prism 18 input CCD cameras 19, in order to the interval of two polarization modes of Laser Measurement.Thereby can obtain the birefringence of corresponding fiber grating.
Table one has been listed the situation of other several embodiment of the present invention and Comparative Examples thereof, and by table as can be seen, though optical fiber is with a kind of optical fiber, because the polarization characteristic difference of the excimer laser that is adopted, the birefringence of resulting fiber grating also is different.The birefringence of the fiber grating of use 193nm ultraviolet light polarizer made has reduced 5 times at least than the birefringence of the fiber grating of the ultraviolet light made that does not use polarizer.
Table one
| Do not use the polarizer of 193nm | Use the polarizer of 193nm | ||||
| The fiber grating numbering | 1 | 2 | 3 | 4 | 5 |
| Polarization mode at interval | 2×10 -3nm | 1.67×10 -3nm | 7.9146×10 -4nm | 1.2597×10 -3nm | 7.8×10 -4nm |
| The change of refractive of fiber grating | 4.97×10 -5 | 4.42×10 -5 | 7.735×10 -5 | 9.39×10 -5 | 12.43×10 -5 |
| The birefringence of fiber grating | 2.76×10 -6 | 2.3×10 -6 | 1.09×10 -6 | 1.74×10 -6 | 1.077×10 -6 |
| The ratio of birefringence and total change of refractive | 5.55％ | 5.2％ | 1.4％ | 1.85％ | 0.866％ |
Claims (3)
1, a kind of method for making of low birefringent fiber grating is characterized in that may further comprise the steps:
1. get an optical fiber (10), wherein a fiber segment (9) is fixed on the fiber clamp (14), makes this fiber segment (9) be close to a phase-plate (8), adds a cover a little shade (7) again on this fiber segment (9);
2. the forward output terminal of this optical fiber (10) connects a spectrometer (13) by an isolator (12), input termination one fluorescence source (11) of this optical fiber (10);
3. opening excimer laser makes the UV laser beam (3) of its 193nm that sends form the p polarized light by the 193nm ultraviolet light polarizer (4), become directional light through collimating and beam expanding system (5), be radiated on the fiber segment (9) through phase-plate (8) and shade (7) and expose, the direction of vibration of this p polarized light is parallel to the transmission direction of fiber segment (9);
4. open fluorescence source (11) and spectrometer (13),, when reaching needed reflectivity, stop exposure, finish the making of fiber grating by the formation of spectrometer (13) monitoring fiber grating.
2, the method for making of low birefringent fiber grating according to claim 1, it is characterized in that the described 193nm ultraviolet light polarizer (4) is that drift angle both sides by a base (1) quartz plate (2) that has been sticked is constituted, described drift angle is 2 times of Brewster angle of 193nm ultraviolet light.
3, the method for making of low birefringent fiber grating according to claim 1 is characterized in that described optical fiber (10) is silica fibre, before making fiber grating, should place a week in 100 atmospheric hydrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108063 CN1243996C (en) | 2003-10-21 | 2003-10-21 | Method for manufacturing low double-refraction optical-fiber grating |
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| CN 200310108063 CN1243996C (en) | 2003-10-21 | 2003-10-21 | Method for manufacturing low double-refraction optical-fiber grating |
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| CN1529192A CN1529192A (en) | 2004-09-15 |
| CN1243996C true CN1243996C (en) | 2006-03-01 |
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| CN 200310108063 Expired - Fee Related CN1243996C (en) | 2003-10-21 | 2003-10-21 | Method for manufacturing low double-refraction optical-fiber grating |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806934B (en) * | 2010-03-29 | 2012-08-22 | 哈尔滨工程大学 | Inner wall fused and embedded single-mode polarization maintaining fiber grating and preparation method thereof |
| CN101881854A (en) * | 2010-04-29 | 2010-11-10 | 哈尔滨工程大学 | Inner wall melt-embedded type multicore single mode polarization-maintaining fiber grating and manufacture method |
| CN104678486B (en) * | 2015-03-17 | 2018-09-04 | 武汉烽理光电技术有限公司 | A kind of preparation method of fiber grating |
| CN104635295B (en) * | 2015-03-17 | 2018-01-09 | 武汉烽理光电技术有限公司 | A kind of online fiber grating preparation system |
| CN105783956B (en) * | 2016-05-16 | 2018-03-13 | 武汉理工大学 | Large Copacity dim light grid array process equipment and method |
| CN106646427B (en) * | 2016-09-27 | 2019-05-17 | 中国科学技术大学 | A kind of optical telescope of low shot noise |
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