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Method for inscribing fiber bragg grating face by face based on high-refractive-index matching liquid

A technology of optical fiber Bragg and high refractive index, applied in cladding optical fiber, optical waveguide light guide, optical, etc., to achieve the effect of improving mechanical properties, uniform distribution of fiber core, and suppressing response

Pending Publication Date: 2022-06-24
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technology to be solved by the present invention is to overcome the shortcomings of the existing fiber grating preparation methods, and provide a method for writing fiber Bragg gratings face by face based on high refractive index matching liquid 12 with reasonable design, high work efficiency, low loss and wide applicability

Method used

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  • Method for inscribing fiber bragg grating face by face based on high-refractive-index matching liquid
  • Method for inscribing fiber bragg grating face by face based on high-refractive-index matching liquid
  • Method for inscribing fiber bragg grating face by face based on high-refractive-index matching liquid

Examples

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Embodiment 1

[0032] exist figure 1 , 2 In this embodiment, the device for surface-by-surface writing of fiber Bragg gratings based on high refractive index matching liquid is that the optical platform 18 is provided with a femtosecond laser 1, and the optical platform 18 is provided with an optical switch 2 and a plane mirror reflection group 3 along the laser output direction. , diaphragm 4, plane mirror 6, microlens group 7, 3D micromachining platform 8, CCD camera 5 is installed on microlens group 7, CCD camera 5 is used for real-time monitoring of the grating writing process, 3D micromachining platform 8 A three-dimensional right-angle manual adjustment frame 16 is installed on the three-dimensional electric displacement stage 17. The three-dimensional right-angle manual adjustment frame 16 is equipped with a glass slide, a fiber optic clamp 14 and an LED light 15. The LED light 15 is located under the glass slide, and the fiber clip is clamped on Hold the optical fiber 13 to be writt...

Embodiment 2

[0044] This embodiment provides a method for surface-by-surface writing of ultra-short gratings and ultra-short grating pairs based on a high-refractive-index matching liquid, wherein the repetition frequency of the laser is 200 Hz, the power is 6 μW, the femtosecond laser 1 is turned on, and the laser power is stabilized to pass through The computer 9 controls the three-dimensional electric displacement stage 17 to move the three-dimensional electric displacement stage 17 along the axis of the optical fiber, and sets the grating length to 100 μm. After writing an ultra-short grating, the three-dimensional electric displacement stage 17 is controlled to move 3000 μm along the optical fiber, and the writing The second ultra-short grating with a length of 100 μm; then turn off the optical switch 2 and the three-dimensional electric displacement stage 17, the writing is over, and the written fiber grating is taken out. Other operation steps are the same as in Example 1.

[0045] ...

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Abstract

The invention discloses a method for inscribing a fiber bragg grating face by face based on high-refractive-index matching liquid. The method comprises the following steps: setting repetition frequency and power parameters of femtosecond laser, and grating length parameters and moving speed which are immediately written by the moving distance of a three-dimensional electric displacement table; selecting a section of area on the optical fiber as an optical fiber grating area to be inscribed, wiping the area with alcohol, placing the optical fiber grating area to be inscribed on a glass slide, fixing two ends of the optical fiber with an optical fiber clamp, and using a refractive index gt on the glass slide; a to-be-inscribed area of the optical fiber is immersed in a 1.5 refractive index matching liquid, the cover glass is covered, the refractive index matching liquid and the optical fiber form a plano-concave cylindrical lens, and the refractive index of the concave cylindrical lens is adjusted by the refractive index matching liquid; and starting the femtosecond laser, and inscribing the fiber bragg grating face by face. The distribution of the refractive index modulation area of the Bragg grating inscribed by the surface-by-surface method in the fiber core is more symmetrical, so that the loss of the grating can be reduced to a great extent, and the Bragg grating has the advantages of simple structure, high working efficiency, low loss and wide applicability.

Description

technical field [0001] The invention belongs to the technical field of grating fabrication, and in particular relates to a method for writing fiber Bragg grating surface by surface based on a high refractive index matching liquid 12 . Background technique [0002] Femtosecond lasers have extremely narrow pulse widths and extremely high peak powers. The interaction with materials is mainly based on nonlinear effects such as multiphoton absorption and avalanche ionization. It can be used to process various materials, especially transparent media. Therefore, femtosecond lasers have a wide range of applications in the field of fiber grating fabrication. [0003] Fiber gratings are widely used in fiber lasers, fiber communications and fiber sensing. Fiber grating has the advantages of low insertion loss, strong anti-electromagnetic interference ability, small size, light weight, and easy to realize wavelength division multiplexing. Fiber gratings can be used as fiber internal m...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02123G02B6/02147
Inventor 乔学光李兴勇陈凤仪王若晖包维佳
Owner NORTHWEST UNIV
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