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15km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50km。
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.
作者
朱金顶
程凌浩
周黎明
刘伟民
Zhu J inding;Chen Linghao;Zhou Liming;Liu Weimin(Institute of Photonics Technology,Jinan University,Guangzhou,Guangdong 511486,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2019年第17期300-305,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61875246)
广州市科技计划项目(201707010338)
关键词
光纤光学
布里渊分布式传感
激光光源
频率漂移
相干接收
fiber optics
distributed Brillouin sensors
laser source
frequency deviation
coherent receiving
