CN1181363C - A method for making long period optical fibre grating - Google Patents
A method for making long period optical fibre grating Download PDFInfo
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- CN1181363C CN1181363C CNB031115527A CN03111552A CN1181363C CN 1181363 C CN1181363 C CN 1181363C CN B031115527 A CNB031115527 A CN B031115527A CN 03111552 A CN03111552 A CN 03111552A CN 1181363 C CN1181363 C CN 1181363C
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 238000013519 translation Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims description 6
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims description 4
- 230000003760 hair shine Effects 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 4
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- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The present invention discloses a manufacture method of a long period optical fiber grating and a device thereof, which belong to the technical field of optical fiber communication and optical fiber sensing. The present invention relates to the manufacture of an optical passive device and an optical fiber. The present invention is characterized in that the long period optical fiber grating is manufactured by a CO2 laser pulse and a three-beam focusing optical system, wherein the CO2 laser pulse has the wavelength of 10.6 mum and the frequency of 20k to 24kHz, and the three-beam focusing optical system is composed of a cylindrical lens and two plane mirrors with an intersection angle of 120 DEG. Laser beams are symmetrically focused onto a bare optical fiber, and a one-dimensional translation table is controlled by a computer to carry out optical fiber remove and exposure. The optical fiber remove and the exposure are carried out alternately, and then the manufacture of the long period optical fiber grating is finished. The manufacture method effectively improves the flexural property of a long period grating, eliminates the physical deformation of a grating, and has the characteristics of simple structure, flexible design, etc. The long period optical fiber grating manufactured by the method can be extensively used for inner-fiber filtering in optical fiber communication with smooth gain, and the long period optical fiber grating is used as a wavelength demodulation type optical fiber sensing element.
Description
Technical field
The invention belongs to optical fiber communication and technical field of optical fiber sensing.Be a kind of method for making and corresponding device thereof of long period fiber grating, relate to the manufacturing technology of optical passive component and fiber optic sensing device in the optical fiber telecommunications system.
Background technology
Since people such as nineteen ninety-five A.M.Vengsarkar successfully write long period fiber grating (Long Period Fiber Grating in optical fiber, hereinafter to be referred as LPFG) since, LPFG is used widely in optical fiber communication and technical field of optical fiber sensing, such as utilize LPFG without male offspring to reflection, insert advantages such as loss is little be developed into fine in band logical/hinder wave filter, the gain-smoothing device of EDFA etc.; Aspect Fibre Optical Sensor, LPFG is higher than bragg grating to the induction sensitivity of temperature, strain, becomes a kind of comparatively desirable wavelength-modulated type sensing element.And compare with bragg grating, LPFG makes easily, and is with low cost.
At present, the method for many making LPFG is arranged, such as the amplitude mask method, bent forming method, CO
2Laser wrting method etc.Up to now, CO
2It is the CO of the focusing of 10.6 μ m that the laser wrting method adopts wavelength usually
2Laser carries out the pointwise exposure to a side of optical fiber, periodically changes the refractive index of fiber core, forms LPFG.Owing to use CO
2Optical fiber was only shone in a side when laser single face write, and not Stimulated Light irradiation of opposite side, it is inhomogeneous in the angular distribution of cross section of optic fibre to cause that optical fibre refractivity changes, thereby the resonance wavelength that causes the LPFG that programming goes out has very strong dependence with crooked direction, and the LPFG that writes out easily produces flexural deformation.
Summary of the invention
The objective of the invention is, a kind of CO simple in structure, easy to make is provided
2The laser three beams focuses on, method and the device thereof of symmetrical programming LPFG, to eliminate CO
2The one-sided irradiation of laser write the refraction index changing that causes inhomogeneous, easily produce diastrophic defective.
Technical scheme of the present invention is to utilize the CO of quartzy strong absorption 10.6 μ m
2The character of laser emission is used CO
2The periodic spot heating optical fiber of laser is released in the stress that remains in the drawing optical fiber process in the optical fiber, and the fiber core refractive index generating period is sexually revised, and forms LPFG.It is that 10.6 μ m, frequency are the CO of 20k～24kHz that the present invention adopts wavelength
2Pulse laser, by a ZnSe cylindrical lens focus, the vertical fiber axis direction forms line spot on optical fiber.For the LPFG that programming is become does not have physical deformation, and relatively consistent flexural property arranged, write the plane mirrors that adopted 120 ° of angles of cut of two one-tenth on the platform at LPFG, thereby can form the three-beam symmetrical illumination optical fiber that is mutually hexagonal angle, carry out LPFG programming operation.
Device of the present invention mainly comprises radio-frequency (RF) excited waveguide CO
2Laser instrument, wide spectrum light source, spectroanalysis instrument, the accurate electronic control translation stage of one dimension, cylindrical focusing lens, hexagonal angle catoptron and computer control system.The number of frequency, dutycycle and laser pulse by regulating the CO2 laser pulse can be set the laser energy that shines on the optical fiber.CO2 laser is after the ZnSe cylindrical lens focus, near focus, form sheet beam, behind two on the programming platform catoptrons that become hexagonal angles, form the three-beam that is mutually hexagonal angle with the light beam of direct irradiation and shine uniformly on the circumference of 360 ° of cross section of optic fibre.In the optical fiber ablation process, monitor the variation of fibre loss spectrum in real time with spectroanalysis instrument.After finishing single exposure,, carry out repeatedly by same step then, up to the periodicity of having write design by computer control translation stage grating cycle of moving fiber vertically.Write length and CO by cycle, the grating of regulating grating
2The parameter of laser pulse just can be produced the LPFG that adheres to specification.
Effect of the present invention and benefit are, having adopted by the cylindrical lens and the angle of cut is the linear Focused Optical system of three beams that two plane mirrors of 120 ° constitute, make the flexural property of the long period fiber grating that programming goes out at the angle uniformity of optical fiber, eliminate physical deformation, reduced Polarization Dependent Loss.Whole LPFG writing system is simple in structure, and easy and control, adjusting and operation have important application value.
Description of drawings
Accompanying drawing 1 is the device synoptic diagram of long period fiber grating method for making.
(1) radio-frequency (RF) excited waveguide CO among the figure
2Laser instrument, (2) SLED wide spectrum light source, (3) computing machine, (4) single-mode fiber, (5) CO
2Laser beam, (6) ZnSe cylindrical lens, (7) grating writes platform, (8) spectroanalysis instrument, the accurate electronic control translation stage of (9) one dimension.
Accompanying drawing 2 is the synoptic diagram that write platform at grating.
(4) single-mode fiber among the figure, (5) CO
2Laser beam, (7) grating writes platform, (10) catoptron 1, (11) catoptron 2.
Embodiment
Describe most preferred embodiment of the present invention in detail below in conjunction with accompanying drawing.
At first according to CO
2The operating characteristic of laser instrument is determined laser parameters, such as frequency of operation, dutycycle and laser pulse number etc.The laser pulse frequency that the present invention adopts is regulated the frequency of laser pulse and the quantity of dutycycle and laser pulse between 20k-24kHz, can change the laser energy that shines on the single-mode fiber (4).Next is according to resonance wavelength and the characteristics such as peak loss size and bandwidth of the LPFG that will make, determine the cycle of LPFG and the length of grating, can calculate the periodicity of the LPFG that will write by above-mentioned two parameters, thereby the parameter of electronic control translation stage (9) is provided with.Place the LPFG that two-face mirror (10,11) is installed to write on the platform (7) bare fibre, control CO by computing machine (3) according to the laser parameter of setting then
2Laser instrument (1) emission pulse laser (5), laser (5) is focused into a line spot by cylindrical lens (6) on single-mode fiber (4).Write platform (7) at LPFG and go up the below that the catoptron (10,11) of 120 ° of two sides one-tenth is positioned at optical fiber (4), optical fiber is apart from the about 0.1mm of two catoptrons (10,11) intersection.Because LPFG writes the said structure of platform (7), can form the three beams of laser symmetry that is mutually 120 ° and incide on the optical fiber (4).Because the light intensity of three-beam is close, make optical fiber on 360 ° of circumference to CO
2The uniform absorption of laser energy is symmetrical thereby make the change of fiber core refractive index basically, has guaranteed the LPFG that the makes consistance to the different directions flexural property.After the laser pulse emission, drive optical fiber (4) by computing machine (3) control electronic control translation stage (9) and move a grating cycle vertically, repeat above-mentioned process then, up to the grating periodicity of having write design.The input end of optical fiber connects a SLED wide spectrum light source (2), and the light that SLED sends outputs to spectroanalysis instrument (8) after passing through the optical fiber that is used for the programming grating, comes the transmission spectrum of the LPFG in the real-time monitoring manufacturing process by spectroanalysis instrument (8).The long period fiber grating of utilizing the present invention to complete, its resonance wavelength peak loss surpasses 30dB, inserts loss less than 1dB.
Claims (1)
1. the method for making of a long period fiber grating, it is characterized in that adopting wavelength is that 10.6 μ m, frequency are the high-frequency impulse CO of 20k～24kHz
2Laser instrument and be that the three direction symmetrical illumination optical systems that 120 ° level crossing constitutes are made long period fiber grating by cylindrical lens and two angles of cut; The step that realizes this method is at first with CO
2Laser beam forms sheet beam through cylinder ZnSe lens focus, the part of sheet beam direct irradiation optical fiber forms three irradiation optical fiber that are mutually the light beam symmetry of hexagonal angle with the part that the mirror reflects that intersects hexagonal angle through two shines optical fiber, makes optical fiber produce on the circumferencial direction variations in refractive index uniformly; After finishing the exposure programming of a position, utilize the one dimension electronic control translation stage, carry out the programming of next cycle along grating Cycle Length of optical fiber axial translation optical fiber; Monitor the spectrum of fiber grating simultaneously with wide spectrum light source and spectroanalysis instrument, until the making of finishing fiber grating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031115527A CN1181363C (en) | 2003-04-24 | 2003-04-24 | A method for making long period optical fibre grating |
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| CNB031115527A CN1181363C (en) | 2003-04-24 | 2003-04-24 | A method for making long period optical fibre grating |
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| CN1181363C true CN1181363C (en) | 2004-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116896A (en) * | 2011-03-14 | 2011-07-06 | 上海大学 | Device and method for manufacturing stress refraction type long period fiber gating |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418010C (en) * | 2004-11-01 | 2008-09-10 | 中国科学院半导体研究所 | Method for making period different holographic gratings on a semiconductor chip |
| CN100375912C (en) * | 2005-04-28 | 2008-03-19 | 北京印刷学院 | Method for making long-period optical fiber by employing electron beams |
| CN102368101B (en) * | 2011-09-01 | 2013-06-19 | 上海大学 | Apparatus for manufacturing pointer polarization maintaining long period fiber grating and method thereof |
| CN102681086B (en) * | 2012-05-03 | 2013-06-12 | 山东省科学院激光研究所 | Fiber bragg grating producing device capable of controlling wavelengths |
| CN103616649A (en) * | 2013-12-02 | 2014-03-05 | 暨南大学 | Magnetic field sensor sensitivity tuning method based on fiber bragg grating laser |
| TWI484232B (en) * | 2013-12-09 | 2015-05-11 | Metal Ind Res & Dev Ct | Method for manufacturing a tunable long-period fiber grating |
| CN104238000B (en) * | 2014-09-24 | 2017-12-22 | 上海大学 | The method for making conical fiber long-period gratings device and encapsulation |
| US20220332628A1 (en) * | 2019-11-15 | 2022-10-20 | INDIAN INSTITUTE OF TECHNOLOGY MADRAS (IIT Madras) | Apparatus to fabricate fiber optic sensor probes and method of fabrication thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116896A (en) * | 2011-03-14 | 2011-07-06 | 上海大学 | Device and method for manufacturing stress refraction type long period fiber gating |
| CN102116896B (en) * | 2011-03-14 | 2013-06-19 | 上海大学 | Device and method for manufacturing stress refraction type long period fiber gating |
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| CN1448736A (en) | 2003-10-15 |
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