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Tunable phase shift optical fiber Bragg optical grating

A Bragg grating and optical fiber technology, applied in cladding optical fibers, optical waveguides and light guides, etc., can solve the problems of complex system structure, slow response speed, poor stability and reliability, etc., and achieve good wavelength selectivity and tunable optics. The effect of the filter function

Active Publication Date: 2008-12-10
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a fast tuning speed, simple structure, high stability and low cost for the existing tuning means of phase-shifting fiber Bragg gratings, which have slow response speed, complex system structure, poor stability and reliability, etc. Low Tunable Phase Shift Fiber Bragg Gratings

Method used

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  • Tunable phase shift optical fiber Bragg optical grating
  • Tunable phase shift optical fiber Bragg optical grating
  • Tunable phase shift optical fiber Bragg optical grating

Examples

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Embodiment Construction

[0011] The following embodiments will further illustrate the present invention in conjunction with the drawings.

[0012] See figure 1 , The present invention is provided with two fiber Bragg gratings 1 and 2 and sleeve 3 with the same period, length and photo-induced refractive index change. The inner diameter of the sleeve 3 matches the outer diameter of the fiber Bragg grating 1 and 2 , The length of the sleeve 3 is 1~2cm longer than the sum of the lengths of the fiber Bragg gratings 1 and 2. The two end faces of the fiber Bragg gratings 1 and 2 are flat. The sleeve 3 is made of glass or ceramic material. The fiber Bragg grating 1 is inserted into the sleeve 3, and the end face of the fiber Bragg grating 1 is located in the middle of the sleeve 3, and the fiber Bragg grating 1 and the sleeve 3 are bonded and cured with glue. A refractive index matching liquid 4 is injected (capable of covering the end face of the grating) in the middle of the sleeve 3, and the end face of the ...

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Abstract

A tunable phase-shift fiber bragg grating relates to a phase-shift fiber bragg grating, in particular to a phase-shift bragg grating with a transmission spectrum with the tunable characteristic, which is based on the fiber bragg grating fabry perot structure. The invention provides a tunable phase-shift fiber bragg grating with fast tuning speed, simple structure, high stability and low cost. The grating is provided with two segments of fiver bragg gratings; a sleeve tube the inner diameter of which is matched with the outer diameter of the fiber bragg grating is inserted into the two segments of the fiber bragg gratings; the gap between the two segments of the fiber bragg gratings is filled with index matched liquid; a gap length adjusting mechanism is arranged in the gap between the two segments of the fiber bragg gratings.

Description

Technical field [0001] The invention relates to a fiber Bragg grating, in particular to a tunable phase shift fiber Bragg grating based on a Fabry-Perot structure of a fiber Bragg grating and having a tunable transmission spectrum. Background technique [0002] Phase-shifted Fiber Bragg Grating (PS-FBG) refers to the introduction of single (or multiple) discontinuities of photo-induced refractive index changes in the middle of conventional fiber Bragg gratings, resulting in gratings With a jump in phase, the transmission spectrum will open one (or more) very narrow transmission peaks in the Bragg stop band, so it has very good wavelength selectivity. The so-called π-phase-shifted fiber Bragg grating is a half grating period of the photoinduced refractive index change at the center of the fiber Bragg grating. PS-FBG can be directly engraved with a phase mask (see literature: R. Kashyqp, et al, UV written reflection grating structures in photosensitive optical fibres using phase-sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
Inventor 董小鹏周金龙林旭锋
Owner XIAMEN UNIV
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