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External cavity laser apparatus for optical fiber grating sensing system

A fiber grating and sensing system technology, applied in lasers, laser parts, semiconductor lasers, etc., can solve the problems of increasing the difficulty of signal demodulation processing, affecting the number of sensing multiplexing, etc., and achieves simple structure, low cost, and high output. The effect of high effective power

Inactive Publication Date: 2008-11-12
原辉 +1
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Problems solved by technology

If the power is too low, it will affect the number of sensing multiplexes and the signal-to-noise ratio of detection, which will increase the difficulty of signal demodulation processing

Method used

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  • External cavity laser apparatus for optical fiber grating sensing system
  • External cavity laser apparatus for optical fiber grating sensing system
  • External cavity laser apparatus for optical fiber grating sensing system

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] figure 1 Shown is a schematic diagram of a typical FBG sensing system. The light source 1 generally adopts a fiber-optic amplified spontaneous emission broadband light source (ASE light source) or a semiconductor superluminescent light emitting diode (SLED light source). The light source 1 structure of the present invention sees figure 2 , the semiconductor optical amplifier 9 and the Faraday rotating total reflection mirror 6 are connected by an optical fiber 7 to form a light source 1 . The control circuit 8 provides temperature control and driving current for the semiconductor optical amplifier 9, so that the semiconductor optical amplifier 9 provides a certain gain. However, in the optical fiber path, since the optical fiber line 3 is relatively long, possibly reaching tens of kilometers, the polarization state of the light inside will change randomly. ...

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Abstract

The invention relates to an external cavity laser device used for a fiber grating sensor system. The device comprises a semiconductor optical amplifier 9, a Faraday rotation total-reflection mirror 6, a control circuit 8, a fiber coupler 2 and a sensory point fiber grating 4; wherein, the semiconductor optical amplifier 9 and the Faraday rotation total-reflection mirror 6 are combined into a light source 1; the Faraday rotation total-reflection mirror 6 functions as a reflecting surface of input light and meanwhile rotates the polarization state of the input light by 90 degrees and then reflects into the semiconductor optical amplifier 9 for amplification as well as compensates the polarization dependence of the semiconductor optical amplifier 9; the sensory point fiber grating 4 functions as another reflecting surface and forms a laser cavity resonator together with the Faraday rotation total-reflection mirror 6. The light source provided by the device of the invention has the advantages of high effective power of output, simple structure and strong practicality.

Description

technical field [0001] The invention relates to an external cavity laser device used in a fiber grating sensing system. Background technique [0002] In recent years, fiber gratings have been successfully used to sense different physical quantities. Its outstanding advantage is reusability. The multiplexing technologies used in optical fiber sensor networks include time division multiplexing, space division multiplexing, wavelength and frequency multiplexing, and coherent multiplexing. Using multiple fiber gratings can form a distributed sensing network to achieve multi-point detection, which has important applications in intelligent and smart structures. Compared with the single-grating sensing system, the multiplexing sensing system has the advantages of high cost performance and large detection range, which has attracted widespread attention. By sharing the light source and electronic processing part, as the number of multiplexed sensors in the system increases, the cos...

Claims

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Application Information

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IPC IPC(8): H01S5/14H01S5/00
Inventor 原辉赖薇
Owner 原辉
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