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High-precision brillouin scattering measuring system in ultrashort optical fiber

A Brillouin scattering and measurement system technology, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., to achieve high detection accuracy, increase effective power, and increase sensitivity

Active Publication Date: 2012-01-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional systems need to use at least 2 optical amplifiers and 2 electro-optical modulators, and can only detect a single stimulated Brillouin gain, which is easily affected by noise interference such as end-face reflections

Method used

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  • High-precision brillouin scattering measuring system in ultrashort optical fiber
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  • High-precision brillouin scattering measuring system in ultrashort optical fiber

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0033] Please see first image 3 , image 3It is a schematic composition diagram of the Brillouin scattering high-precision measurement system in the ultra-short optical fiber of the present invention. As shown in the figure, a high-precision measurement system for Brillouin scattering in an ultra-short optical fiber is composed of a laser 2, and the output direction of the laser 2 is connected to the input end of a fiber coupler 3, and the fiber coupler 3 is connected to the input end of the fiber coupler 3. One output end is connected to one end of the circulator 9 through the first polarization controller 4, the fiber isolator 5, and the detection fiber 6 in turn; the other output end of the fiber coupler 3 is connected to the double Mach through the second polarization...

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Abstract

The invention relates to a high-precision brillouin scattering measuring system in an ultrashort optical fiber. The system comprises a laser; an input terminal of an optical fiber coupler is connected with the laser at an output direction of the laser; an output terminal of the optical fiber coupler successively passes a first polarization controller, an optical fiber isolator, and a detection optical fiber and then is connected to one end of a circulator; the other output terminal of the optical fiber coupler successively passes a second polarization controller and then is connected to an input terminal of a single sideband modulator; an output terminal of the single sideband modulator passes an optical fiber amplifier and then is connected to the other input terminal of the circulator; an output terminal of the circulator passes a photoelectric detector and then is connected with a first input terminal of a lock-in amplifier; an output terminal of the lock-in amplifier is connected with a data collection processing system; and a square wave signal generator is respectively connected with a second input terminal of the single sideband modulator and a second input terminal of the lock-in amplifier. Meanwhile, according to the invention, a stimulated brillouin scattering gaining process and a stimulated brillouin scattering loss process are utilized, so that a detection sensitivity on a whole of a sensing optical fiber is improved and influences of interference signals like end surface reflection can be avoided; moreover, costs are reduced.

Description

technical field [0001] The invention relates to a high-precision measurement system for Brillouin scattering in an ultrashort optical fiber, in particular to a detection system based on stimulated Brillouin scattering. Background technique [0002] Stimulated Brillouin Scattering (Stimulated Brillouin Scattering) can be described as the nonlinear interaction of two beams of light in a medium (such as a silica fiber). When two beams facing each other (pump light with probe light ) meet in the fiber, and the frequency of the two beams satisfies the Brillouin frequency shift, energy exchange occurs. The process of stimulated Brillouin scattering is as figure 1 , two beams of optical pump light , probe light meet each other in the fiber, when the frequency minus When the frequency satisfies the Brillouin frequency shift, that is , due to the stimulated Brillouin scattering effect, energy transferred to , Light produces the gain of Brillouin scattering, i.e. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/079
Inventor 邹卫文金重九陈建平吴龟灵沈建国
Owner SHANGHAI JIAO TONG UNIV
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