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Device for producing triangular fiber grating

A fiber grating and manufacturing device technology, which is applied in cladding optical fiber, optical waveguide light guide, photoplate process of pattern surface, etc., can solve the limited Bragg wavelength adjustability, mechanical stability and high spatial coherence of the writing beam , Difficulty in adjusting the writing device, etc., to achieve the effect of easy wavelength adjustment, low cost, and simple structure

Inactive Publication Date: 2010-04-28
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have many disadvantages, such as limited Bragg wavelength tunability, difficulty in adjusting the writing device, high requirements for mechanical stability and spatial coherence of the writing beam, etc.

Method used

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  • Device for producing triangular fiber grating
  • Device for producing triangular fiber grating
  • Device for producing triangular fiber grating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment combines the attached figure 1 Further explanation.

[0021] A device for manufacturing a triangular fiber grating that uses a converging lens and a diverging lens to form a speed expansion system, such as figure 1 shown.

[0022] The manufacturing device includes: an excimer laser 1 , a speed expansion system 2 composed of a first converging lens 21 and a first diverging lens 22 , a phase mask 3 , an optical fiber 4 , and a black cloth 5 .

[0023] The excimer laser 1 is used as the writing light source, and the lenses in the expansion system 2 are placed in the order of the first converging lens 21 and the first diverging lens 22. The expansion system 2 and the phase mask 3 are placed perpendicular to the main optical axis. And make the center of the phase mask 3 just on the main optical axis, place the 42 end of the optical fiber close to the 32 end of the phase mask, and make the optical fiber 4 tilt an angle of 1° relative to the phase mask 3 . T...

Embodiment 2

[0027] This embodiment combines the attached figure 2 Further explanation.

[0028] A device for manufacturing a triangular fiber grating that uses two converging lenses to form a speed-expanding system, such as figure 2 shown.

[0029] The fabrication device includes: an excimer laser 1 , a speed expansion system 2 composed of a first converging lens 21 and a second converging lens 23 , a phase mask 3 , and an optical fiber 4 .

[0030] The excimer laser 1 is used as a writing light source, and the lenses in the expansion system 2 are placed in the order of the first converging lens 21 and the second converging lens 23, the expansion system 2 and the phase mask 3 are placed perpendicular to the main optical axis, and The center of the phase mask 3 is upwardly deviated from the main optical axis by 5mm, the distance between the end 42 of the optical fiber and the end 32 of the phase mask is 5mm, and the optical fiber 4 is inclined at an angle of 15° relative to the phase m...

Embodiment 3

[0034] This embodiment combines the attached image 3 Further explanation.

[0035] A device for manufacturing a triangular fiber grating that uses a converging lens, a diverging lens, and a compensating lens to form a speed expansion system, such as image 3 shown.

[0036] The manufacturing device includes: an excimer laser 1 , a speed expansion system 2 composed of a first converging lens 21 , a first diverging lens 22 and a compensating lens 25 , a phase mask 3 , and an optical fiber 4 .

[0037] The excimer laser 1 is used as the writing light source, and the arrangement order of the lenses in the speed expansion system 2 is the first converging lens 21, the first divergence lens 22, and the compensation lens 25. The speed expansion system 2 is placed perpendicular to the main optical axis, and the phase mask The template 3 forms an angle of 30° with the main optical axis, and the center of the phase mask 3 deviates downward from the main optical axis by 50mm, the optic...

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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

technical field [0001] The invention relates to a manufacturing device of an optical fiber grating, which is suitable for the fields of optical fiber communication, optical fiber sensing, traffic information engineering, control technology and the like. Background technique [0002] Fiber Bragg gratings are made using light sensitivity in optical fibers. Fiber Bragg gratings are divided into fiber Bragg gratings and long-period fiber gratings according to their periods. The period of fiber Bragg gratings is generally below 1um, while the period of long-period fiber gratings is tens of um to hundreds of um. In many cases, fiber Bragg gratings are simply referred to as fiber gratings. According to the periodic characteristics, they can be divided into uniform fiber gratings with uniform period, or chirped fiber gratings whose period changes along the axial direction. The bandwidth of the reflection spectrum of a uniform fiber grating is generally less than 0.5nm, while the ba...

Claims

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Application Information

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IPC IPC(8): G02B6/02G03F7/00
Inventor 宁提纲周倩裴丽李晶胡旭东张帆雷飞鹏
Owner BEIJING JIAOTONG UNIV
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