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Double-edge filter based on optical fiber bragg grating

A dual-edge, filter technology, applied in the field of filters, can solve the problems of high price, unfavorable system integration, large volume, etc., and achieve the effect of low cost, small volume, and eliminating the influence of detection accuracy.

Inactive Publication Date: 2011-09-21
BEIHANG UNIV
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Problems solved by technology

[0005] The double-edge filter based on the F-P etalon is a precision optical device, which has the advantages of high precision, high sensitivity and stable performance, but its price is relatively expensive and the volume is large, which is not conducive to the integration of the overall system

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  • Double-edge filter based on optical fiber bragg grating
  • Double-edge filter based on optical fiber bragg grating
  • Double-edge filter based on optical fiber bragg grating

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] see image 3 , the double edge filter based on fiber Bragg grating of the present invention. The connection relationship between the components is: the first optical fiber 5 is connected to the A end of the first optical fiber coupler 6, and the C end of the first optical fiber coupler 6 is connected to the 1 port of the first optical fiber circulator 8 through the second optical fiber 7 , the first fiber Bragg grating 9 is connected to the 2 ports of the first fiber circulator 8, the 3 ports of the first fiber circulator 8 are connected to the input end A of the first avalanche photodetector 11 through the third optical fiber 10, the first avalanche The output B of the photodetector 11 is connected to the first cable 12 . The D end of the first optical fiber coupler 6 is connected to the 1 port of the second optical fiber ci...

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Abstract

The invention relates to a double-edge filter based on fiber Bragg gratings. Incident light enters a first optical fiber coupler through an optical fiber and is divided into two equal parts which are output through a C end and a D end of the optical fiber coupler; and two paths of output light signals enter a first optical fiber circulator and a second optical fiber circulator respectively, are reflected by a first fiber Bragg grating and a second fiber Bragg grating respectively, received by a first avalanche photodetector and a second avalanche photodetector and transformed into electrical signals, thereby realizing an all-fiber light path structure with small volume, low cost and high stability. The invention also discloses a Brillouin scattering distributed optical fiber sensor, whichcomprises two double-edge filters, wherein the first double-edge filter is used for providing feedback and stabilizing the operating wavelength of a laser; and the second double-edge filter is used for detecting Brillouin scattering optical frequency shift, so as to realize measured distributed sensing.

Description

technical field [0001] The invention relates to a filter, more particularly to a double-edge filter based on a fiber Bragg grating. Background technique [0002] Laser Doppler radar uses the Doppler effect of light to measure the Doppler frequency shift of the backscattered signal when the laser beam is transmitted in the atmosphere to invert the spatial wind speed distribution. There are two main signal detection technologies of laser Doppler radar: coherent detection technology and direct detection technology. The coherent detection technology measures the difference frequency signal between the echo signal and the emitted laser signal, and the direct detection technology measures the relative energy change between the received signal and the emitted laser signal. [0003] The main implementation methods of direct detection technology of laser Doppler radar include single-edge detection and double-edge detection. Single-edge detection technology generally uses a single F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/42G02B6/34G02B6/26G02B6/02
Inventor 杨远洪杨巍陈明飞郭锦锦张萍萍马游春
Owner BEIHANG UNIV
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