非对称分布反馈光纤激光传感器复用特性及机理研究

项目名称： 非对称分布反馈光纤激光传感器复用特性及机理研究

项目编号： No.61307101

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 孙志慧

作者单位： 山东省科学院

项目金额： 29万元

中文摘要： 分布反馈光纤激光（DFB-FL）传感器是一种新型有源光纤传感器，具有灵敏度高、动态范围大、易于波分复用、体积小重量轻等优点，在微弱水声、震动信号探测方面有着不可比拟的优势，具有广阔应用前景。但目前DFB-FL传感器在走向应用方面尚有诸多瓶颈问题未解决，如复用噪声抑制、大规模复用、远程传输等。本课题针对现有对称DFB-FL传感器复用性能停滞不前的现状，首次开展非对称DFB-FL传感器复用特性与机理研究。在分析非对称DFB-FL特性和光反馈影响机理的基础上，通过对非对称DFB-FL进行优化设计，结合组合隔离结构、分布式拉曼光纤放大等方法，重点解决相移光栅旁瓣抑制、远程传输中光纤瑞利散射抑制和信号光放大、阵列功率均衡和单纤密集复用的问题，从理论和实验上探讨出抑制复用噪声的方法和提升单纤密集复用性能的技术途径，为降低DFB-FL传感器阵列噪声、增大远程传输能力和实现大规模组网提供理论和技术支撑。

中文关键词： 光纤激光传感器；非对称分布反馈光纤激光器；复用噪声抑制；分布式拉曼光纤放大；远程传输

英文摘要： Distributed feedback fiber laser (DFB-FL) sensor is a new type of active fiber optic sensor with high sensitivity, large dynamic range, easy to wavelength division multiplexing, small size,light weight,etc. It has unparalleled advantages in weak vibration signal and underwater acoustic signal detection, and has broad application prospects.However, in the application of DFB-FL sensor, there are many key technical issues yet to be resolved, such as multiplexing noise suppression, large-scale multiplexing, remote transmission. For the existing stagnant status of symmetric DFB-FL sensors multiplexing, the project carries out the research of asymmetric DFB-FL sensor multiplexing features and mechanism for the first time. Based on the analysis of asymmetric DFB-FL features and the optical feedback influence mechanism, we study optimization designs of asymmetric DFB-FL and adopt the combined optical fiber isolation devices, distributed Raman fiber amplification methods. We focus on solving the phase shift grating sidelobe suppression, remote transmission fiber Rayleigh scattering suppression and DFB-FL signal optical amplification, the array optical power balance and single-fiber dense multiplexing. And we can explore the methods of multiplexing noise suppression and single-fiber dense wavelength division multiplexing

英文关键词： fiber laser sensor；;asymmetric DFB fiber laser；multiplexing noise suppression；distributed Raman fiberamplification；remote transmission