自光纤随机激光器概念提出以来,光纤随机激光已经在光纤激光、光纤传感等领域得到了广泛关注。将光纤随机激光与光纤光栅相结合,基于光纤光栅的光谱变化信息可以实现高性能点式传感系统,因此,此类系统的光谱特征决定了传感距离、精度和复用能力等关键参数。针对高阶随机激光多点传感系统中光谱特性仿真这一关键问题,对传统的高阶随机激光功率稳态模型进行改进,所提出的模型的光谱仿真结果均与实验高度吻合。基于该仿真模型,设计并实现了长达150 km的高阶光纤随机激光多点传感系统。同时,实验得到的传感信号波长与应变的线性拟合度高达0.999,充分验证了该系统的传感性能。

Since the concept of random fiber laser was proposed, it has received extensive attentions in the fields of fiber lasers, fiber sensing, etc. Combining random fiber laser with fiber grating, high performance point-sensing system can be realized based on spectral change information of fiber grating. Therefore, the spectral characteristics of this system determine key parameters such as sensing distance, accuracy and multiplexing capability. Aiming at the key issue of high-order random laser multi-point sensing system, i.e., spectral characteristics simulation, this paper improves the traditional high-order random laser power balance model, and the spectral simulation results of the proposed model are in good agreement with the experiment. Based on the simulation model, a high-order random fiber laser multi-point sensing system with a length of 150 km is designed and realized. At the same time, the fitting linearity of the sensing signal wavelength and strain obtained from the experiment is as high as 0.999, which fully verifies the system’s sensing performance.