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Novel optical fiber Brillouin light time domain analyzer

A technology of optical time domain analysis and fiber laser, which is applied in the direction of instruments, scientific instruments, and optical devices, can solve technical difficulties and other problems, and achieve the effects of improving signal-to-noise ratio, improving accuracy, and increasing measurement length

Inactive Publication Date: 2008-12-17
WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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Problems solved by technology

However, the fiber Brillouin optical time-domain analyzer requires strictly locking the frequencies of the narrow-band probe laser and the narrow-band pump laser, which is technically difficult

Method used

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  • Novel optical fiber Brillouin light time domain analyzer
  • Novel optical fiber Brillouin light time domain analyzer
  • Novel optical fiber Brillouin light time domain analyzer

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Embodiment Construction

[0029] With reference to Fig. 1, the optical fiber Brillouin optical time domain analyzer of the present invention comprises narrow-band single-frequency fiber laser 11, optical fiber splitter 12, pulse modulator 13, two optical fiber circulators 14,15, heterodyne receiver 16, Digital signal processor 17, fiber grating filter 18, single-mode optical fiber 19 and continuously running fiber Raman pump laser 20, the input end of fiber splitter 12 is connected with narrowband single-frequency fiber laser 11, fiber splitter 12 An output end of the pulse modulator 13 is connected with the input end of the pulse modulator 13, and the output end of the pulse modulator 13 is connected with the input end of the first optical fiber circulator 14, and the common end of the first optical fiber circulator 14 is connected with the input of the fiber grating filter 18 The output end of the fiber grating filter 18 is connected to the first end of the single-mode fiber 19, the end of the single-...

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Abstract

The invention discloses an optical fiber Brillouin optical time domain analyzer, which is made based on optical fiber broadband nonlinear light amplification effect and strain, temperature effect and optical light domain analysis principle of coherent amplified Brillouin scattering. The optical fiber Brillouin optical time domain analyzer comprises a narrowband single-frequency fiber laser, a fiber beam splitter, a pulse modulator, two optical fiber circulators, a heterodyne receiver, a digital signal processor, a fiber-grating filter, a monomode fiber and a continuous-operating fiber Raman pump laser. The continuous-operating high-power fiber Raman pump laser is used as the pump light source of the Brillouin optical time domain analyzer, which can overcome the difficulty in strictly locking the frequency of a detection laser and the pump laser of the Brillouin optical time domain analyzer; and boardband fiber nonlinear scattering amplification is used for substituting for narrowband Brillouin amplification to increase the gain of stimulated Brillouin scattering with back amplification, thus improving the S / N ratio of the system, increasing the measurement length, and improving the accuracy for simultaneous measurement of stain and temperature.

Description

technical field [0001] The invention relates to an optical fiber Brillouin optical time domain analyzer and belongs to the technical field of distributed optical fiber sensors. Background technique [0002] In the field of optical fiber Brillouin optical time domain analyzer, the optical fiber Brillouin optical time domain reflector adopts the spontaneous Brillouin scattering of optical fiber, so the back Brillouin scattering signal is very weak. The accuracy of measuring strain and temperature is very low, the measurement range is short, and the spatial resolution is low. T.Horiguchi invented the Brillouin optical time-domain analyzer, adding a coherent pump laser at the other end of the fiber to achieve Brillouin amplification, using coherently amplified stimulated Brillouin scattering to enhance the signal and improve the The signal-to-noise ratio of the system. However, the fiber Brillouin optical time-domain analyzer requires strictly locking the frequencies of the na...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01K11/32G01K11/3206G01K11/322
Inventor 张在宣张淑琴
Owner WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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