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A method for precise writing of fbg wavelength based on pre-writing

A wavelength, pre-engraved technology, applied in instruments, optics, diffraction gratings, etc., can solve problems such as deviation and large uncertainty of Bragg reflection center wavelength

Active Publication Date: 2018-11-23
BEIJING INFORMATION SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preload calculated by interpolation will deviate from the actual situation. Therefore, the existing method of writing FBG has a large uncertainty in the Bragg reflection center wavelength, generally ±0.5nm

Method used

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  • A method for precise writing of fbg wavelength based on pre-writing
  • A method for precise writing of fbg wavelength based on pre-writing
  • A method for precise writing of fbg wavelength based on pre-writing

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Embodiment 1

[0027] The invention provides a pre-written FBG wavelength accurate writing method, the structure of which is composed of an excimer pulse ultraviolet light source, a beam shaping optical path, a grating phase mask, an optical fiber positioning system and an online monitoring system for optical fiber writing. The light source generates pulsed ultraviolet light, which is focused on the grating phase mask plate through the beam shaping optical path, and the phase mask plate generates ±1-order diffracted light, and the interference light formed by the diffracted light exposes and writes the FBG on the optical fiber. In the process of writing, pre-writing is performed first, and the excimer pulsed ultraviolet light source is controlled to output a pulse at the minimum output power. The optical fiber writing online monitoring system monitors the reflection spectrum of the FBG and the reflection center wavelength of the pre-writing reflection peak; and then according to the needs For...

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Abstract

The invention provides a pre-inscribing-based accurate FBG wavelength inscribing method. An excimer pulse ultraviolet light source, a beam shaping optical path, a grating phase mask plate, a fiber positioning system and an on-line fiber inscribing monitoring system are employed by the method. The fiber positioning system consists of a fiber clamp, a three-dimensional adjustment frame and a pre-tightening force application device. With the method, precise application of the pre-tightening force needed by a designated wavelength can be realized; and the uncertainty of Bragg reflection wavelength of FBG inscribing can be reduced.

Description

technical field [0001] The invention relates to the technical field of writing optical fiber gratings, in particular to an optical fiber pre-writing method, which sequentially realizes accurate writing of optical fiber grating wavelengths. Background technique [0002] Fiber Bragg Grating (hereinafter referred to as FBG) is one of the most important photonic devices developed in the past half a century since the invention of optical fiber. It has the advantages of high sensitivity, small size, light weight, and anti-electromagnetic interference. , have been widely used in the fields of fiber laser, fiber optic communication and fiber optic sensing. [0003] At present, the common FBG manufacturing methods are as follows: double-beam holographic interference lateral writing method, point light source writing method and phase mask method. [0004] Phase mask method: By making different phase masks, and then placing the optical fiber behind the phase mask, and exposing the opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18
CPCG02B5/1857
Inventor 祝连庆庄炜董明利何巍娄小平辛璟焘骆飞
Owner BEIJING INFORMATION SCI & TECH UNIV