Dual wave length distributed feedback optical fiber laser based on symmetric Bragg grating

A distributed feedback, fiber laser technology, applied in the field of lasers, can solve the problems of poor beam quality, narrow output wavelength interval, low optical signal-to-noise ratio, etc., to avoid mode competition.

Inactive Publication Date: 2007-10-17
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to provide a dual-wavelength distributed feedback fiber laser based on a symmetrical Bragg grating, which solves the problem of poor beam quality, low optical signal-to-noise ratio, complex device, high cost, narrow output wavelength interval and non-tunable in the background technology. technical issues

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  • Dual wave length distributed feedback optical fiber laser based on symmetric Bragg grating
  • Dual wave length distributed feedback optical fiber laser based on symmetric Bragg grating
  • Dual wave length distributed feedback optical fiber laser based on symmetric Bragg grating

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[0020] The fiber laser of the present invention is mainly composed of a pump source, an isolator, a symmetric grating (SFBG), and a beam splitter, as shown in FIG. 1 for details. Uniform fiber grating (length L 1 ) is separated by periodic non-grating parts to form an SFBG. The SFBG is divided into two parts, the front and the back, with the middle of the middle grating as the boundary, and the grating interval in the first half is L 2 , L 3 , L 2 , L 3 ..., the grating interval in the second half is L 3 , L 2 , L 3 , L 2 ..., see Figure 2 for details. The gratings in the first half are sampled from 0 to π, and the gratings in the second half are sampled from π to 0. In the process of making SFBG, the Bragg period Λ is 534.2nm. By adjusting the septum L 2 and L 3 The length of them, so that they respectively satisfy L 2 =mΛ, L 3 =(n+0.5)Λ, where m and n are both integers. Therefore, L 2 , L 3 Corresponding to phase shifts of 2mπ and (2n+1)π respectively, they a...

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Abstract

The invention relates to a dual wavelength distribution feedback optical fiber laser based on symmetry type Bragg grating, which comprises a pumping source, an isolator, a grating and a beam splitter. The specific structure of the grating is that, uniform grating parts with a width of L1 are distributed alternately with parts without grating, which has two widthes, L2 and L3; the uniform grating parts and the parts without grating are arranged according to the ...L1L2L1L3...L3L1L3...L3L1L2L1... mode, this kind of arrangement mode is symmetry about the central, wherein, L2 = m lambada, L3=(n+0.5)lambada, lambada is the Praha period, and m,n respectively represents integer. The invention has solved the technical problems such as a poor quality of the background technic light beam, a low optical Signal-to-Noise, complex apparatus, costly, narrow output wavelength interval and non-tunable; and the invention has advantage of dual wavelength output,tunable output wavelength, very high optical Signal-to-Noise, capable of efficiently avoid ing mode competition, and a single polarization state.

Description

technical field [0001] The invention relates to a laser capable of generating dual wavelengths, in particular to a distributed feedback fiber laser capable of generating dual wavelengths. Background technique [0002] Existing fiber lasers mostly operate at a single wavelength. Ordinary distributed feedback (DFB) fiber lasers also output at a single wavelength. However, in some special occasions, dual-wavelength lasers are required. Existing dual-wavelength lasers mainly include the following types: [0003] 1. Semiconductor dual-wavelength laser, which is a semiconductor laser with two wavelengths packaged in the same component; [0004] 2. Solid-state lasers, such as: LD side-pumped Nd:YAG dual-wavelength lasers; [0005] 3. A dual-wavelength DFB fiber laser based on a chirped structure. [0006] But these several kinds of dual-wavelength lasers have obvious shortcomings and defects: the first kind of beam quality is poor, and the process is complicated; the second ki...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00H01S3/067H01S3/0941H01S3/10G02B27/44G02B6/00
Inventor 刘雪明王涛宫永康王雷然赵卫
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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