Distribution type Brillouin time domain analysis system

An optical time-domain analysis and distributed technology, applied in the field of optical fiber, can solve problems such as output pulse light distortion, achieve the effect of reducing transient gain saturation, solving the deterioration of spatial resolution, solving the effect of intensity noise transfer and nonlinear effects

Inactive Publication Date: 2016-03-16
SICHUAN NORMAL UNIVERSITY
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Problems solved by technology

[0010] 2. Solve the distortion pr

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  • Distribution type Brillouin time domain analysis system
  • Distribution type Brillouin time domain analysis system
  • Distribution type Brillouin time domain analysis system

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] 1. The specific working method:

[0026] like figure 1 Shown: the Brillouin optical time domain analysis system of the present invention includes a laser 1, a first electro-optic modulator 5, a first fiber Bragg grating 11, a first erbium-doped fiber amplifier 13, a first polarizer 16, a second Polarization controller 18, second electro-optic modulator 19, second fiber Bragg grating 23, second erbium-doped fiber amplifier 24, acousto-optic modulator 26, second polarizer scrambler 28, third erbium-doped fiber amplifier 29, detector 30. Acquisition card 32, third fiber Bragg grating 35, fourth erbium-doped fiber amplifier 36, fiber to be measured 38, distributed Brillouin amplification system, and optical pulse encoding and decoding system. Wherein, the laser 1 is a distributed feedback semiconductor laser, which is used to generate the laser used in the experim...

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Abstract

Although the distribution type Brillouin time domain analysis has been given wide attention, it has not been well applied due to pulse distortion and high power of Raman amplification. According to the invention, the distribution type Brillouin amplifying technology and the frequency comb technology are combined and applied in a long-distance distribution type Brillouin time domain analysis system. Strength noise transferring and nonlinear effects caused by distribution type Raman amplification are solved; because the input light power is quite low, reliability of the system is guaranteed; and pulse shapes are restored by use of the frequency comb and incidence pulse light frequency mixing method, distortion of the pulse is avoided, thereby solving the problem of deterioration of spatial resolution caused by the deformation of the pulse and reducing transient-state gain saturation to some extent.

Description

technical field [0001] The invention belongs to the technical field of optical fibers, and specifically proposes a method for improving the performance of a Brillouin optical time domain analysis system by applying a combination of distributed Brillouin amplification technology and frequency comb technology. Background technique [0002] Distributed optical fiber sensing was proposed in the 1970s. It not only has the advantages of no radiation interference, good anti-electromagnetic interference, and stable chemical properties, but also can feedback the spatial distribution of the measured field on the optical fiber path and change with time. changing information. Based on its unique advantages, distributed optical fiber sensors have been widely used in the safety detection of major structures and equipment such as pipelines, bridges, mining areas, geology, optical / cables, etc. [0003] The distributed Brillouin optical time-domain analysis system can have high measurement ...

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Application Information

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IPC IPC(8): G01D21/02G01D5/353
CPCG01D21/02G01D5/353
Inventor 贾新鸿常涵清
Owner SICHUAN NORMAL UNIVERSITY
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