CN101699324A - Device for producing triangular fiber grating - Google Patents

Device for producing triangular fiber grating Download PDF

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Publication number
CN101699324A
CN101699324A CN200910237207A CN200910237207A CN101699324A CN 101699324 A CN101699324 A CN 101699324A CN 200910237207 A CN200910237207 A CN 200910237207A CN 200910237207 A CN200910237207 A CN 200910237207A CN 101699324 A CN101699324 A CN 101699324A
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China
Prior art keywords
mask plate
phase mask
optical fiber
lens
optical axis
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Pending
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CN200910237207A
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Chinese (zh)
Inventor
宁提纲
周倩
裴丽
李晶
胡旭东
张帆
雷飞鹏
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Beijing Jiaotong University
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Beijing Jiaotong University
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Priority to CN200910237207A priority Critical patent/CN101699324A/en
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Abstract

The invention discloses a device for producing a triangular fiber grating, which is applicable to the fields of optical fiber communication, optical fiber sensing, traffic information engineering, control technology and the like. The device utilizes a speed expansion system consists of a lens and adopts a same mask plate for producing the triangular fiber grating, and the wavelength regulation of the triangular fiber grating is very simple. An excimer laser (1) of the production device is taken as a writing light source, the speed expansion system (2) and the phase mask plate (3) are arranged by being vertical to a main optical axis, and optical fibers (4) and the phase mask plate (3) are arranged by 0 degree-45 degrees. Ultraviolet rays emitted by the excimer laser (1) pass through the speed expansion system (2) and then stretching is carried out, an ultraviolet beam after the stretching is incident onto the phase mask plate (3), interference fringes are produced, and the interference fringes utilize the light induction for producing the refractive index modulation in fiber cores of the optical fibers (4) which are very close to the phase mask plate (3), thereby forming the triangular fiber grating.

Description

A kind of producing device of triangle grating
Technical field
The present invention relates to a kind of producing device of fiber grating, be applicable to fields such as optical fiber communication, Fibre Optical Sensor, Traffic Information Engineering ﹠ Control technology.
Background technology
Fiber grating is to utilize the photosensitivity in the optical fiber to make.Fiber grating is divided into bragg grating and long period fiber grating according to the cycle, the bragg grating cycle generally below 1um, and the cycle of long period fiber grating at tens um to hundreds of um.Bragg grating abbreviates fiber grating under many circumstances as, and it is according to cyclophysis, is divided into even constant uniform fiber grating of cycle, perhaps the chirped fiber grating that changes vertically of cycle.Uniform fiber grating reflectance spectrum bandwidth is generally less than 0.5nm, and the bandwidth of chirped fiber grating is from 0.1nm to tens nm, even nm is wide more than 100.
Fiber grating is relatively more responsive to the variation of external environments such as temperature, pressure, strain, have volume little, insert loss low, with the optical fiber compatibility, can imbed advantage such as intellectual material, obtained using widely in optical fiber communication and sensory field.And chirped fiber grating also has good dispersion compensation ability, is dispersion compensation device commonly used in the jumbo dense wavelength division multiplexing system, and this makes the research of chirped fiber grating become very important.
The ultimate principle of fiber-optic grating sensor is to utilize fiber grating spectrum, especially its peak is with the characteristic of temperature and STRESS VARIATION, the change transitions that the external world is measured is the variation of bragg wavelength, observes the wavelength shift of fiber grating and just can judge size to be measured.In order to detect wavelength change, require simple and easy, cheap spectral measurement method, to replace the spectrometer of the costliness of in the laboratory, using usually.Triangle grating (triangle Bragg grating), perhaps be referred to as the triangle bragg grating and belong to nonlinearly chirped fiber grating, its characteristic is: in its bandwidth range, the change of reflectivity and lambda1-wavelength is linear in certain wavelength coverage.Utilizing this characteristic of triangle grating, is the signal of optical power change with the conversion of signals of wavelength variations.Therefore triangle grating can be widely used at sensory field of optic fibre.
Usually having two kinds of methods to produce warbles: the one, and the modulation amplitude method of warbling, promptly the cycle of grating remains unchanged, but along the grating refractive index modulation variation; The 2nd, utilize mask plate pitch to change the cycle that changes grating, and index modulation remain unchanged.It is a lot of to change the method that the grating cycle changes, as non-homogeneous cycle mask means, ablation process to optical fiber stress application gradient or temperature gradient method, prestress optical Fiber Method when writing grating, in the standard mask method writes the curved fiber method, in the holographic interference ablation process, utilize wavefront different curvature method etc.But these methods have many weak points,, writing station adjustment difficulty, mechanical stability limited as the Bragg wavelength tunability and write the light beam spatial coherence and require high.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that overcomes the method that changes the variation of phase mask plate cycle, proposes a kind of producing device of triangle grating.
Technical scheme of the present invention:
A kind of triangle grating producing device, it comprises excimer laser, phase mask plate, optical fiber, optical fiber and phase mask plate are 0 °～45 ° placements.Between excimer laser and phase mask plate, establish an expansion speed system; Excimer laser is as writing light source, and the expansion speed system places perpendicular to primary optical axis.
The parallel ultraviolet that excimer laser produces is through expansion speed system broadening, ultraviolet light beam behind the broadening incides on the phase mask plate and produces interference fringe, interference fringe is utilized photo-induction to become and produce index modulation in the fibre core of optical fiber, forms triangle grating.
By changing the wavelength that distance between optical fiber and the phase mask plate can change the triangle grating that writes, along with the increase of distance, wavelength increases gradually.
Beneficial effect of the present invention:
The producing device structure of a kind of triangle grating that the present invention proposes is very simple, only needs excimer laser, lens, phase mask plate and optical fiber, and cost is low, is easy to realize.This producing device just can be produced triangle grating by single exposure.Change the triangle grating that distance between optical fiber and the phase mask plate can write different wave length, the wavelength regulation of the triangle grating that writes is very easy to.
Description of drawings
Fig. 1 adopts the triangle grating producing device synoptic diagram of a convergent lens and a divergent lens composition expansion speed system.
Fig. 2 adopts two convergent lenses to form the triangle grating producing device synoptic diagram of expansion speed system.
Fig. 3 adopts the triangle grating producing device synoptic diagram of a convergent lens, a divergent lens and an offset lens composition expansion speed system.
Fig. 4 adopts the triangle grating producing device synoptic diagram of two convergent lenses and two divergent lens composition expansion speed systems.
Among the figure: excimer laser 1, expansion speed system 2, phase mask plate 3, optical fiber 4, black cloth 5, first convergent lens 21, first divergent lens 22, second convergent lens 23, second divergent lens 24, offset lens 25.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
Present embodiment 1 further specifies in conjunction with the accompanying drawings.
A kind of producing device that adopts the triangle grating of a convergent lens and a divergent lens composition expansion speed system, as shown in Figure 1.
This producing device comprises: expansion speed system 2, phase mask plate 3, optical fiber 4, black cloth 5 that excimer laser 1, first convergent lens 21 and first divergent lens 22 are formed.
Excimer laser 1 is as writing light source, lens are put and are first convergent lens 21, first divergent lens 22 in proper order in the expansion speed system 2, expansion speed system 2 all places perpendicular to primary optical axis with phase mask plate 3, and the center that makes phase mask plate 3 is just in time on primary optical axis, 42 ends of optical fiber are close to the 32 ends placement of phase mask plate, and make optical fiber 4 with respect to 1 ° of angle of phase mask plate 3 inclinations.The focal length of first convergent lens 21 is 5mm, the focal length 50mm of first divergent lens 22, and the distance between first convergent lens 21 and first divergent lens 22 is 55mm, the distance between first divergent lens 22 and the phase mask plate 3 is 5mm.
The first half of expansion speed system 2 is covered with black cloth 5, the parallel ultraviolet that excimer laser 1 produces is through the latter half broadening of expansion speed system 2, ultraviolet light beam behind the broadening incides on the phase mask plate 3 and produces interference fringe, interference fringe is utilized photo-induction to become in the fibre core of that part of optical fiber that optical fiber 4 exposes and is produced index modulation, forms triangle grating.
The wavelength of the triangle grating that the described producing device of present embodiment is made is 1535nm.
Embodiment two
Present embodiment 2 further specifies in conjunction with the accompanying drawings.
A kind of producing device that adopts two convergent lenses to form the triangle grating of expansion speed system, as shown in Figure 2.
This producing device comprises: expansion speed system 2, phase mask plate 3, optical fiber 4 that excimer laser 1, first convergent lens 21 and second convergent lens 23 are formed.
Excimer laser 1 is as writing light source, lens are put order and are first convergent lens 21, second convergent lens 23 in the expansion speed system 2, expansion speed system 2 and phase mask plate 3 are placed perpendicular to primary optical axis, and make the center of phase mask plate 3 upwards depart from primary optical axis 5mm, 42 ends of optical fiber and 32 end distances of phase mask plate are from being 5mm, and make optical fiber 4 with respect to the phase mask plate 3 15 ° of angles that tilt; The focal length of first convergent lens 21 is 10mm, the focal length 30mm of second convergent lens 23, and the distance between first convergent lens 21 and second convergent lens 23 is 40mm, second convergent lens 23 is 100mm with the distance of phase mask plate 3.
The parallel ultraviolet that excimer laser 1 produces is through expansion speed system 2 broadenings, ultraviolet light beam behind the broadening incides on the phase mask plate 3 and produces interference fringe, interference fringe is utilized photo-induction to become in the fibre core of that part of optical fiber that the optical fiber 4 with phase mask plate 3 close proximity exposes and is produced index modulation, forms triangle grating.
The wavelength of the triangle grating that the described producing device of present embodiment is produced is 1545nm.
Embodiment three
Present embodiment 3 further specifies in conjunction with the accompanying drawings.
A kind of producing device that adopts the triangle grating of a convergent lens, a divergent lens and an offset lens composition expansion speed system, as shown in Figure 3.
This producing device comprises: excimer laser 1, first convergent lens 21 and first divergent lens 22 and expansion speed system 2, phase mask plate 3, the optical fiber 4 that offset lens 25 is formed.
Excimer laser 1 is as writing light source, lens are put and are first convergent lens 21, first divergent lens 22, offset lens 25 in proper order in the expansion speed system 2, expansion speed system 2 places perpendicular to primary optical axis, phase mask plate 3 is 30 ° of angles with primary optical axis, and the center downward bias that makes phase mask plate 3 is from primary optical axis 50mm, optical fiber 4 is placed perpendicular to primary optical axis, and makes the 32 end 10mms of 42 end distances of optical fiber from phase mask plate.The focal length of first convergent lens 21 is 30mm, the focal length of first divergent lens 22 is 20mm, the focal length of offset lens 25 is 50mm, distance between first convergent lens 21 and first divergent lens 22 is 10mm, first divergent lens 22 to and offset lens 25 between distance be 30mm, offset lens 25 is 500mm with the distance of phase mask plate 3.
The parallel ultraviolet that excimer laser 1 produces is through expansion speed system 2 broadenings, ultraviolet light beam behind the broadening incides on the phase mask plate 3 and produces interference fringe, interference fringe is utilized photo-induction to become in the fibre core of that part of optical fiber that the optical fiber 4 with phase mask plate 3 close proximity exposes and is produced index modulation, forms triangle grating.
The wavelength of the triangle grating that the described producing device of present embodiment is produced is 1555nm.
Embodiment four
Present embodiment 4 further specifies in conjunction with the accompanying drawings.
A kind of triangle grating producing device that adopts two convergent lenses and two divergent lens composition expansion speed systems, as shown in Figure 4.
This producing device comprises: excimer laser 1, first convergent lens 21 and first divergent lens 22, second convergent lens 23 and second expansion speed system 2, phase mask plate 3, the optical fiber 4 that convergent lens 24 is formed.
Excimer laser 1 is as writing light source, lens are put order and are first convergent lens 21, first divergent lens 22, second convergent lens 23, second convergent lens 24 in the expansion speed system 2, expansion speed system 2 places perpendicular to primary optical axis, phase mask plate 3 is 45 with primary optical axis, and the center downward bias that makes phase mask plate 3 is from primary optical axis 128mm, optical fiber 4 is placed perpendicular to primary optical axis, and makes the 32 end 15mms of 42 end distances of optical fiber from phase mask plate.The focal length of first convergent lens 21 is 40mm, the focal length of first divergent lens 22 is 10mm, the focal length of second convergent lens 23 is 50mm, the focal length of second divergent lens 24 is 5mm, distance between first convergent lens 21 and first divergent lens 22 is 30mm, distance between first divergent lens 22 and second convergent lens is 10mm, distance between second convergent lens 23 and second divergent lens 24 is 55mm, and the distance of second divergent lens and phase mask plate 3 is 1000mm.
The parallel ultraviolet that excimer laser 1 produces is through expansion speed system 2 broadenings, ultraviolet light beam behind the broadening incides on the phase mask plate 3 and produces interference fringe, interference fringe is utilized photo-induction to become in the fibre core of that part of optical fiber that the optical fiber 4 with phase mask plate 3 close proximity exposes and is produced index modulation, forms triangle grating.
The wavelength of the triangle grating that the described producing device of present embodiment is produced is 1575nm.
Distance between phase mask plate 3 and the optical fiber 4 is the distances of phase mask plate 32 ends to optical fiber 42 ends; That part of part that can shine for light beam of optical fiber 4 exposure.
Device used in the present invention is commercially available device.

Claims (5)

1. triangle grating producing device, it comprises laser instrument, phase mask plate, optical fiber, optical fiber and phase mask plate are 0 °～45 ° placements;
It is characterized in that: laser instrument adopts excimer laser, between excimer laser (1) and phase mask plate (3), establishes an expansion speed system (2); Excimer laser (1) is as writing light source, and expansion speed system (2) places perpendicular to primary optical axis;
The parallel ultraviolet that excimer laser (1) produces is through expansion speed system (2) broadening, ultraviolet light beam behind the broadening incides phase mask plate (3) and goes up and produce interference fringe, interference fringe is utilized photo-induction to become and produce index modulation in the fibre core of optical fiber (4), forms triangle grating.
2. single stage method triangle grating producing device according to claim 1 is characterized in that: expansion speed system (2) comprises first convergent lens (21) and first divergent lens (22) that order is placed; Phase mask plate (3) is placed perpendicular to primary optical axis, and its center is just in time on primary optical axis; (42) end of optical fiber is close to (32) end of phase mask plate and is placed; The first half of expansion speed system (2) covers the ultraviolet light beam that excimer laser (1) is launched with black cloth (5).
3. single stage method triangle grating producing device according to claim 1 is characterized in that: expansion speed system (2) comprises first convergent lens (21), second convergent lens (23) that order is placed; Phase mask plate (3) is placed perpendicular to primary optical axis, and wherein departs from primary optical axis 5mm～128mm on the mind-set; (42) end distance of optical fiber is from (32) of phase mask plate end 5mm～15mm.
4. single stage method triangle grating producing device according to claim 1 is characterized in that: expansion speed system (2) comprises first convergent lens (21), first divergent lens (22) and the offset lens (25) that order is placed; Phase mask plate (3) and primary optical axis are 0 °～45, and the center downward bias that makes phase mask plate (3) is from primary optical axis 5mm～128mm; Optical fiber 4 is placed perpendicular to primary optical axis, and makes (42) end distance of optical fiber hold 5mm～15mm from (32) of phase mask plate.
5. single stage method triangle grating producing device according to claim 1 is characterized in that: expansion speed system (2) comprises first convergent lens (21), first divergent lens (22), second convergent lens (23) and second divergent lens (24) that order is placed; Phase mask plate (3) and primary optical axis are 0 °～45, and the center downward bias that makes phase mask plate (3) is from primary optical axis 5mm～128mm; Optical fiber 4 is placed perpendicular to primary optical axis, and makes (42) end distance of optical fiber hold 5mm～15mm from (32) of phase mask plate.
CN200910237207A 2009-11-05 2009-11-05 Device for producing triangular fiber grating Pending CN101699324A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102193150A (en) * 2011-04-27 2011-09-21 暨南大学 Method and device for preparing adjustable edge filter based on all-fiber technology
CN102221727A (en) * 2011-07-18 2011-10-19 武汉理工大学 Apodizing device and method for realizing single exposure
CN107783216A (en) * 2017-10-24 2018-03-09 武汉锐科光纤激光技术股份有限公司 A kind of device and method that Chirp gratings are made using Uniform Mask
CN111552023A (en) * 2020-03-29 2020-08-18 桂林电子科技大学 Special-shaped core fiber grating preparation technology based on semi-circle phase compensation plate

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102193150A (en) * 2011-04-27 2011-09-21 暨南大学 Method and device for preparing adjustable edge filter based on all-fiber technology
CN102221727A (en) * 2011-07-18 2011-10-19 武汉理工大学 Apodizing device and method for realizing single exposure
CN102221727B (en) * 2011-07-18 2012-11-07 武汉理工大学 Apodizing device and method for realizing single exposure
CN107783216A (en) * 2017-10-24 2018-03-09 武汉锐科光纤激光技术股份有限公司 A kind of device and method that Chirp gratings are made using Uniform Mask
CN111552023A (en) * 2020-03-29 2020-08-18 桂林电子科技大学 Special-shaped core fiber grating preparation technology based on semi-circle phase compensation plate

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Open date: 20100428