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Common polarization maintaining optical fibre grating tunable single polarization dual wavelength optical fibre laser

A fiber laser, polarization-maintaining fiber technology, applied in lasers, laser parts, cladding fibers, etc., can solve the problems of inability to achieve the output laser polarization degree of semiconductor lasers, the wavelength interval cannot be adjusted, and the output wavelength is unstable. Reduces compliance requirements, eases tuning, and eliminates effects of mode competition

Inactive Publication Date: 2008-06-18
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The birefringence of the fiber structure itself and the external effects on the fiber are random, so the coupling between the polarization modes is random. Therefore, in general, the laser output from the fiber laser is chaotic in polarization, which cannot reach the output of the semiconductor laser. The degree of polarization; the other two polarization states appear randomly, resulting in unstable output wavelength and wide output wavelength line width. Such laser output cannot be applied in many cases
At present, polarization-maintaining fiber lasers are realized in laboratories, using complex control methods such as polarization-maintaining fibers, polarization-maintaining couplers, and polarization control. The wavelength interval cannot be adjusted, the cost is high, and it is difficult to be practical.

Method used

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  • Common polarization maintaining optical fibre grating tunable single polarization dual wavelength optical fibre laser

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Experimental program
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Effect test

Embodiment 1

[0026] The connection between the parts of the co-polarization-maintaining fiber grating tunable single constituting the laser is:

[0027] 1) Select a Y splitter with an arbitrary splitting ratio, connect the polarization-maintaining fiber Bragg grating 11 to the in-line arm 41 of the Y splitter, and add an adjuster 61 on the polarization-maintaining fiber Bragg grating to adjust the wavelength interval of the polarization-maintaining fiber Bragg grating;

[0028] 2) Select the first active optical fiber 21 doped with erbium and the second active optical fiber 22 doped with erbium, and connect these two active optical fibers to the bifurcated arms of the Y splitter respectively.

[0029] 3) Connect the first and second broadband fiber gratings 12 and 13 respectively at the other two ends of the first and second active optical fibers 21 and 22, and the reflection spectra of the first and second broadband fiber gratings 12 and 13 are separated from each other , there is no over...

Embodiment 2

[0035] The connection between the parts of the co-polarization-maintaining fiber grating tunable single constituting the laser is:

[0036] 1) Select a coupler with an arbitrary splitting ratio, connect the polarization-maintaining fiber Bragg grating 11 on the in-line arm 41 of the coupler, and add an adjuster 61 for adjusting the wavelength interval of the polarization-maintaining fiber Bragg grating on the polarization-maintaining fiber Bragg grating;

[0037] 2) Select the polarization-maintaining active fibers 21 and 22 doped with ytterbium, and connect the polarization-maintaining active fibers 21 and 22 to the bifurcated arms of the coupler.

[0038] 3) Connect the first and second broadband fiber gratings 12 and 13 to the other two ends of the first and second polarization-maintaining active optical fibers 21 and 22 respectively, and the reflection spectra of the broadband fiber gratings 12 and 13 are separated from each other without overlapping part, or there is a we...

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Abstract

The invention discloses a polarization co-maintaining fiber grating tunable single-polarization dual-wavelength fiber laser. An 'I'-shaped Y-splitter or coupler of the laser is connected with the polarization maintaining fiber grating (11); the forfication arm of the Y-splitter or the coupler is connected with active fibers (21) and (22); furthermore, two external ends of the active fibers (21) and (22) are connected with broadband fiber gratings (12) and (13) to form two independent resonant cavities respectively with the polarization maintaining fiber grating; pumping lights (31) and (32) are coupled into the active fibers (21) and (22) by the coupler and single polarization lasers are generated respectively; the wavelength interval adjusting of output dual-wavelength laser is implemented by the temperature or / and stress adjusting of an adjuster (51).

Description

technical field [0001] The invention relates to a fiber grating laser, which is suitable for optical fiber communication, microwave photon, optical fiber sensing and the like. Background technique [0002] The birefringence of ordinary optical fiber is small, and there is only one reflection peak for fabricating fiber gratings on ordinary optical fiber, and this reflection peak contains two polarization states. Due to the large birefringence of the polarization maintaining fiber, the effective refractive index of the fast and slow axes is different, and there are two independent polarization states. The fiber grating made on the polarization maintaining fiber has two reflection peaks, and these two reflection peaks correspond to two independent polarization states. Polarization state <Ning Gang et al. "Using gratings to study the temperature characteristics of polarization-maintaining fiber", China Laser 33(8) 2006 p.1078-1080">, these two reflection peaks are single p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/082H01S3/16G02B6/02
Inventor 宁提纲祁春慧裴丽阮乂胡旭东许欧鲁韶华陈明戴毅
Owner BEIJING JIAOTONG UNIV