Distributed optical fiber sensing device based on Brillouin fiber laser

A distributed optical fiber and fiber laser technology, which is applied in the direction of using optical devices, using optical devices to transmit sensing components, measuring devices, etc., can solve the problems of high-speed modulators that are not easy to work stably and are expensive, and reduce system cost and complexity. Accuracy, cost reduction, ease of optical integration and packaging

Inactive Publication Date: 2016-07-13
NANCHANG INST OF TECH
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Problems solved by technology

At present, the commonly used method to obtain two beams of oppositely transmitted pump light and probe light is to use electro-optical modulation microwave source

Method used

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  • Distributed optical fiber sensing device based on Brillouin fiber laser

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with accompanying drawing.

[0015] Such as figure 1As shown, the output light of the narrow-linewidth pump laser 1 is amplified by the first erbium-doped fiber amplifier 2, and then used as a Brillouin fiber laser (by the first optical circulator 3, the temperature controller 4, the Brillouin gain fiber 5, Brillouin pumping of the optical path part constituted by the fiber coupler 6). When the pump power is sufficient, the incident pump light will generate stimulated Brillouin scattering with the fiber in the Brillouin gain fiber, and the backscattered laser will propagate in the counterclockwise direction to the fiber coupler where part of the light is output and the other part is Staying in the cavity interacts with the pump light passing through the fiber, the Brillouin laser is amplified by Brillouin, the transmitted pump light suffers Brillouin loss, and the residual Brillouin pump light passes ...

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Abstract

A distributed optical fiber sensing device based on a Brillouin fiber laser comprises a narrow linewidth pump laser, an erbium-doped fiber amplifier, a pulse signal generator, a scrambler, an optical isolator and the like. A dual-output port of the Brillouin fiber laser is used for outputting two beams of light waves with a frequency difference of a Brillouin frequency shift, one beam of frequency tunable Brillouin laser is pulse modulated into pump light, and the other beam is used as continuous probe light. The tunable Brillouin laser output is achieved through a temperature controller of a Brillouin laser chamber. The frequency tunable pulse pump light and the continuous probe light are in Brillouin interaction with each other in a sensing fiber. The signal processing at the rear end of the sensing system is the same as that of a general Brillouin optical-time domain analysis system. By providing the pump light and the probe light through the Brillouin fiber laser, the invention can eliminate a tunable microwave source and a mating modulator that are required in the general Brillouin optical-time domain analysis system, so that the cost and complexity of the whole system are greatly reduced and the optical integration and package of the system are facilitated.

Description

technical field [0001] The invention belongs to the technical field of Brillouin fiber laser and distributed fiber optic sensing, and in particular relates to a distributed fiber optic sensing device and method based on Brillouin scattering. Background technique [0002] Due to its unique characteristics, the Brillouin fiber laser based on the Brillouin scattering effect, the Brillouin Stokes light generated by stimulated Brillouin scattering, its frequency is shifted down by one compared to the Brillouin pump light. Brillouin frequency shift, its value depends on the material and doping characteristics of the fiber itself on the one hand, and is also affected by environmental factors such as ambient temperature and strain on the other hand. In addition, the Brillouin scattering laser line width is narrow, and the laser structure is simple. The application research of Brillouin fiber laser has become a research hotspot, and it has been used in vibration sensors, optically g...

Claims

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Application Information

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IPC IPC(8): G01D5/353G01B11/16G01H9/00G01K11/32G01K11/322
CPCG01B11/18G01D5/35364G01H9/004G01K11/32
Inventor 徐荣辉李院民邓承志孙辉汪胜前
Owner NANCHANG INST OF TECH
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