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Novel method for preparing chirped optical fiber bragg grating by means of uniform grating mask plate

A Bragg grating and chirped fiber technology, applied in cladding fibers, optical waveguide light guides, light guides, etc., can solve the problems of fiber life and performance effects, fiber bending process affecting chirped modulation accuracy, etc., to save production costs. Effect

Inactive Publication Date: 2021-01-22
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, since the shape recovery of the memory alloy needs to reach the transition temperature, it will affect the life and performance of the optical fiber, and its own deformation error and the bending process of the optical fiber will also directly affect the accuracy of the chirp modulation.

Method used

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  • Novel method for preparing chirped optical fiber bragg grating by means of uniform grating mask plate
  • Novel method for preparing chirped optical fiber bragg grating by means of uniform grating mask plate

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Embodiment 1

[0025] Example 1: A new method for preparing chirped fiber Bragg gratings by means of a uniform grating mask

[0026] The CFBG writing system that the present invention uses is as figure 1 As shown, the preparation steps are as follows:

[0027] Step 1: Set the writing parameters of the excimer laser 1, and adjust the relative positions of the mirror part 2, the beam expander part 3 and the cylindrical lens part 4 in the writing system to collimate the ultraviolet laser beam so that it can be accurately focused on the surface to be written. The position of the core of the incoming optical fiber 6.

[0028] Step 2: According to design requirements, select a uniform grating mask with appropriate parameters, and place it on the mask holder to form the uniform grating mask part 5 .

[0029] Step 3: Take a single stress element optical fiber 6, peel off the coating layer from the section to be written into the CFBG, fix it on the optical fiber fixture after cleaning, the optical ...

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Abstract

The invention provides a novel method for preparing a chirped optical fiber bragg grating by means of a uniform grating mask plate. The novel method is suitable for preparing chirped optical fiber bragg grating of an optical fiber with a fiber core having large-range transverse refractive index change. The method is characterized in that an excimer laser device, a reflector, a beam expander, a cylindrical lens, a mask plate and a single-stress-element optical fiber are sequentially placed in an inscribing light path, a fiber core is parallel to the mask plate and perpendicular to the grid lineof the mask plate, and the chirped optical fiber bragg grating can be obtained through the process of inscribing the uniform optical fiber bragg grating. According to the invention, the chirped optical fiber Bragg grating with different spectral characteristics can be prepared only by using the same phase mask plate by using optical fibers with different fiber core refractive indexes and large-range transverse change; and the method can be used for preparing the chirped optical fiber bragg grating and can be widely applied to the technical field of optical fiber devices.

Description

[0001] (1) Technical field [0002] The invention relates to a new method for preparing a chirped fiber Bragg grating by means of a uniform grating mask plate, which belongs to the technical field of optical fiber devices. [0003] (2) Background technology [0004] Chirped fiber Bragg grating (CFBG) is a fiber Bragg grating (FBG) whose refractive index or grating period changes along the axial direction. Due to its small size, low loss, wide reflection bandwidth and stable dispersion, it is Widely used in optical fiber dispersion compensation and broadband filters. [0005] When the refractive index and grid period in the FBG grid area are different, the wavelengths satisfying the Bragg conditions of the specific grid area are also different, so that the FBG has a chirp effect, that is, CFBG. In view of this characteristic of grid formation, there are currently two types of methods for fabricating CFBG, direct and indirect. (1) The direct method is to directly write CFBG in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02138G02B6/02123
Inventor 苑立波徐致远
Owner GUILIN UNIV OF ELECTRONIC TECH
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