Novel Brillouin time domain analyzer

Abstract

The invention discloses a novel Brillouin time domain analyzer, which comprises a pulse detection light generation module, a pump light source module, a first optical coupler, a second optical coupler, a frequency control module, a detection light output and signal processing module and a pump light output module, and is characterized in that: the pulse detection light generation module comprises a laser driving circuit capable of generating electric pulse signals, a narrow line width tunable semiconductor laser, a third optical coupler and an optical fiber amplifier; the laser driving circuit is connected with the frequency control module; the input end of the third optical coupler is connected with the narrow line width tunable semiconductor laser; two output ends of the third optical coupler are respectively connected with the input end of the optical fiber amplifier and another input end of the first optical coupler; and the output end of the optical fiber amplifier is connected with the detection light output and signal processing module. The novel Brillouin time domain analyzer has the advantages of low cost, high spacial resolution, high measurement accuracy and long measurement distance.

Description

technical field [0001] The invention relates to an optical time domain analyzer, in particular to a novel Brillouin optical time domain analyzer. Background technique [0002] Distributed temperature sensor (DTS) has important applications in the fields of safety monitoring of power cables, disaster prevention and alarm in key areas. At present, the commonly used DTS is to use the Raman scattering effect in the optical fiber to obtain the temperature changes along the optical fiber by measuring the back Raman scattered light intensity of the optical fiber. This measurement technology is now relatively mature, but due to the limitation of the detection light intensity, the current achievable spatial resolution is about 3 to 4 meters, the temperature measurement accuracy is greater than 1 degree, and the measurable optical fiber length generally does not exceed 10 kilometers . In addition, DTS based on Raman scattering technology needs to use multimode fiber as the measureme...

AI Technical Summary

Problems solved by technology

However, the external optical modulation devices available on the market that meet the performance indicators are all imported and expensive, and in order to ensure the normal operation of the optical external modulation device, all optical devices between the detection light source and the optical modulation device must have polarization maintaining Performance, which has become a bottleneck restricting the cost reduction of Brillouin optical time domain analyzers

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