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Apparatus for distributed feedback optical fiber laser frequency modulation and denoising

A fiber laser, distributed feedback technology, applied in lasers, laser parts, laser parts and other directions, can solve the problems of high cost, slow response to temperature frequency modulation, etc., to achieve the effect of low cost, lower adjustment output frequency, and improved performance

Inactive Publication Date: 2009-05-06
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

The invention uses piezoelectric ceramic stress frequency modulation and noise reduction, which overcomes the shortcomings of slow temperature frequency modulation response and high cost.

Method used

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  • Apparatus for distributed feedback optical fiber laser frequency modulation and denoising
  • Apparatus for distributed feedback optical fiber laser frequency modulation and denoising
  • Apparatus for distributed feedback optical fiber laser frequency modulation and denoising

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing.

[0040] see figure 1 As shown, a device for frequency modulation and noise reduction of a distributed feedback fiber laser in the present invention is characterized in that it includes:

[0041] A semiconductor laser 1, used to pump the active optical fiber to realize population inversion;

[0042] A first wavelength division multiplexer 2a, the 980 end of the first wavelength division multiplexer 2a is connected to the output end of the semiconductor laser 1;

[0043] A first optical isolator 4a, the input end of the first optical isolator 4a is connected to the 1550 end of the first wavelength division multiplexer 2a, for isolating the light of reverse propagation;

[0044] An active phase shift grating 3, one end of the active phase shift grating 3 is connected to the multiplexer end of the wavelength division multiplexer 2a for providing optical gain and feedback, and ...

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Abstract

The invention relates to a frequency modulation and noise reduction device for a distributed feedback fiber laser. The frequency modulation and noise reduction device comprises a semiconductor laser, a first wavelength division multiplexer, a first optical isolator, an active phase-shifted grating, a second optical isolator, a second wavelength division multiplexer, a polarization controller, a measuring feedback part and a control part, wherein the 980 end of the first wavelength division multiplexer is connected with the output end of the semiconductor laser; the input end of the first optical isolator is connected with the 1550 end of the first wavelength division multiplexer; one end of the phase-shifted grating is connected with the coupled end of the wavelength division multiplexer; the input end of the second optical isolator is connected with the other end of the active phase-shifted grating; the coupled end of the second wavelength division multiplexer is connected with the output end of the second optical isolator; one end of the polarization controller is connected with the 1550 end of the second wavelength division multiplexer; the measuring feedback part is connected with the other end of the polarization controller; and the input end of the control part is connected with the output end of the measuring feedback part. The device is used to realize frequency modulation and noise reduction for the DFB optical fiber laser.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a distributed feedback fiber laser with adjustable output frequency and low noise. It is mainly used in the field of laser light source and optical fiber sensing. Background technique [0002] The fiber laser with doped fiber as the gain medium has the advantages of good compatibility with fiber, narrow linewidth, and controllable wavelength. Sensing and other fields have a wide range of applications. Fiber lasers with straight cavity structure are divided into distributed Bragg reflection (DBR) and distributed feedback (DFB) structures. Compared with DBR fiber lasers, DFB fiber lasers use a single phase shift grating to provide feedback and wavelength selection, and the output is a single longitudinal mode , there is no mode hopping, and the relative intensity noise and frequency noise are low. Whether it is used as a light source or as a sensing element, DFB fiber lasers have more...

Claims

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Application Information

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IPC IPC(8): H01S3/10H01S3/02H01S3/00G02F1/35
Inventor 徐团伟李芳刘育梁
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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