Sensing signal detecting device and method based on fiber Brillouin ring laser

A ring laser and fiber circulator technology, applied in lasers, measuring devices, laser parts, etc., can solve the problems of high frequency of coherent optical signals, complex detection technology, poor stability, etc., and achieve high signal-to-noise ratio and good stability. , the effect of convenient coherent detection

Inactive Publication Date: 2012-07-04
CHINA JILIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art that the frequency of the c...

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  • Sensing signal detecting device and method based on fiber Brillouin ring laser
  • Sensing signal detecting device and method based on fiber Brillouin ring laser
  • Sensing signal detecting device and method based on fiber Brillouin ring laser

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Embodiment Construction

[0019] Further illustrate the present invention below in conjunction with accompanying drawing.

[0020] Such as figure 1 As shown, the present invention is realized in this way: the continuous light emitted from the light source DFB laser 1 is divided into two paths through the first fiber coupler 2, which are respectively used as the detection light and the reference light, and the detection light is modulated into pulsed light by the pulse modulator 3 After being amplified by the first erbium-doped fiber amplifier 4, it enters the first single-mode fiber 6 through the first optical fiber circulator 5 to generate back self-published Brillouin scattering, and the Brillouin scattered signal passes through the second port of the first optical fiber circulator Return in the circulator, after being output by the third port of the circulator, amplify again through the second erbium-doped fiber amplifier 13; the reference light enters the single-frequency fiber Brillouin ring lase...

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Abstract

The invention discloses a sensing signal detecting device and a sensing signal detecting method based on a fiber Brillouin ring laser. The device comprises a narrow linewidth DFB (distributed feedback) laser, three optical fiber couplers, a pulse modulator, two erbium-doped fiber amplifiers, two optical fiber circulators, two single-mode fibers, an optical isolator, a polarization controller and a photoelectric detector, wherein the fiber Brillouin ring laser is composed of the second optical fiber circulator, the second single mode fiber, the optical isolator, the second optical fiber coupler and the polarization controller. Light emitted from the laser is divided into two beams of light via the optical fiber couplers, wherein the probe light is modulated into pulsed light which enters into sensing optical fiber after passing through the erbium-doped fiber amplifiers to ensure that back spontaneous Brillouin scattered signals are generated; the reference light passes through the center frequency of the fiber Brillouin ring laser to ensure that a Brillouin frequency shift is generated; and the coherent detection is carried out on the two Brillouin scattered signals which are scattered back to ensure that the advantages of rapid high-accuracy detection and simple structure are realized by utilizing low-cost devices.

Description

technical field [0001] The invention belongs to the technical field of test and measurement, in particular to a Brillouin sensing signal detection device and method based on an optical fiber Brillouin ring laser. Background technique [0002] Distributed optical fiber sensing technology occupies an important position in today's sensing field. Its biggest advantage is that it can realize distributed measurement, coupled with the unique characteristics of optical fiber, such as light weight and softness, anti-electromagnetic interference, and the ability to integrate transmission sensing In Yishen et al., distributed optical fiber sensing technology has become the focus of people's research. Brillouin optical time domain reflectometer (BOTDR) can realize distributed measurement, and can measure two parameters of temperature and strain at the same time. Has a wide range of applications. [0003] Self-Brillouin scattering is extremely weak, which is about 2 to 3 orders of magn...

Claims

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Application Information

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IPC IPC(8): G01J9/02H01S3/00
Inventor 龚华平李小瑞王剑锋金尚忠张在宣
Owner CHINA JILIANG UNIV
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