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激光频率稳定性对布里渊分布式传感系统的影响

Influence of Laser Frequency Stability on Distributed Brillouin Sensing System

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摘要

设计并搭建了一种基于相干检测和瑞利散射的光源频率稳定性测量系统,以实现对光源微秒量级瞬时微小频偏的测量。基于该测量系统对布里渊分布式传感系统中光源频率波动所导致的性能劣化进行了研究。研究表明频率波动较大的激光源会造成测量得到的布里渊增益谱展宽,并逐渐偏离洛伦兹谱型,导致布里渊频率测量的误差较大,最终将传感距离限制在15 km之内。而频率波动较小的激光源可以使系统的传感距离达到50 km。

Abstract

Herein, we design and implement a laser frequency stability measurement system based on coherent detection and Rayleigh scattering to measure the instantaneous small frequency deviation of the laser. Based on the proposed system, the study examines performance degradation due to laser frequency fluctuation in distributed Brillouin sensors. Results show that large frequency fluctuation of the laser can result in the broadening of the Brillouin gain spectrum and deviation from the Lorentz shape. This produces a large error in the measurement of Brillouin frequency and limits the sensing range to 15 km for the laser studied. The sensing range can be extended to 50 km by a laser with good frequency stability.

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DOI:10.3788/LOP56.170624

所属栏目:功能光纤

基金项目:国家自然科学基金、广州市科技计划项目;

收稿日期:2019-02-27

修改稿日期:2019-04-09

网络出版日期:2019-09-01

作者单位    点击查看

朱金顶:暨南大学光子技术研究院, 广东 广州 511486
程凌浩:暨南大学光子技术研究院, 广东 广州 511486
周黎明:暨南大学光子技术研究院, 广东 广州 511486
刘伟民:暨南大学光子技术研究院, 广东 广州 511486

联系人作者:程凌浩(chenglh@ieee.org)

备注:国家自然科学基金、广州市科技计划项目;

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引用该论文

Jinding Zhu, Linghao Chen, Liming Zhou, Weimin Liu. Influence of Laser Frequency Stability on Distributed Brillouin Sensing System[J]. Laser & Optoelectronics Progress, 2019, 56(17): 170624

朱金顶, 程凌浩, 周黎明, 刘伟民. 激光频率稳定性对布里渊分布式传感系统的影响[J]. 激光与光电子学进展, 2019, 56(17): 170624

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