光纤中基于受激布里渊散射的模间色散补偿及传感

发布时间：2018-07-08 19:17

本文选题：光纤 + 受激布里渊散射　；参考：《兰州理工大学》2017年硕士论文

【摘要】：本文利用了全矢量有限元法和后向差分法,分析了光纤中受激布里渊散射声波特性,以及声波与光波间的相互作用,并利用该特性讨论了其在传感及模间色散补偿上的应用。本文的主要研究内容及取得的成果如下:1、为解决布里渊频移同时受温度和应变影响的交叉敏感问题,提出了用声波导布里渊散射同时检测温度和应变的传感器设计方案。根据声波导布里渊散射中不同声模对温度和应变的敏感度不同,设计特定的泵浦光和斯托克斯光频率,使检测的频谱图上呈现多峰放大现象。再根据温度和应变对声模特征频率的影响,区分出光纤所受温度和应变值。模拟结果表明标准SMF-28光纤中,R02模对应的温度敏感度比TR25模对应的温度敏感度低0.86%,R02模对应的应变敏感度比TR25模对应的应变敏感度高54.1%。由于R02模和TR25模对应温度敏感度近似相同,而两者对应应变敏感度相差较大,可以有效地区分出温度和应变对布里渊频移的影响,从而达到温度应变同时测量的目的。2、利用非迭代后向差分法研究了小信号模型下,少模光纤中受激布里渊散射特性。分析了少模光纤在模分复用MIMO系统中模间色散的产生原因、受激布里渊散射的慢光效应,讨论了利用受激布里渊散射慢光效应进行模间色散补偿的可行性。分析结果表明当少模光纤中LP11模充当斯托克斯光时,慢光效应可以对模间色散完全补偿;对于因传输信号变化、外界干扰、光纤不规则等因素引起的不同模间色散值,可在系统结构不变情况下,仅改变输入泵浦参数使得模间色散匹配补偿。这种设计方案灵活度高、适用范围广、具有一定的实用价值。
[Abstract]:In this paper, the characteristics of stimulated Brillouin scattering sound wave in optical fiber and the interaction between sound wave and optical wave are analyzed by means of full vector finite element method and backward difference method, and their applications in sensing and dispersion compensation between modes are discussed. The main contents and achievements of this paper are as follows: 1. In order to solve the cross-sensitivity problem of Brillouin frequency shift affected by temperature and strain simultaneously, a sensor design scheme for simultaneous detection of temperature and strain by Brillouin scattering by acoustic waveguide is proposed. According to the sensitivity of different acoustic modes to temperature and strain in Brillouin scattering of acoustic waveguides, specific pump and Stokes light frequencies are designed to amplify the detected spectrum. According to the influence of temperature and strain on the characteristic frequency of acoustic model, the temperature and strain value of fiber are distinguished. The simulation results show that the temperature sensitivity of R02 mode in standard SMF-28 fiber is lower than that of TR25 mode. The strain sensitivity of R02 mode is 54.1 higher than that of TR25 mode. Because the temperature sensitivity of R02 mode and TR25 mode is approximately the same, and the strain sensitivity of R02 mode and TR25 mode is quite different, the effect of temperature and strain on Brillouin frequency shift can be effectively distinguished. In order to achieve the purpose of simultaneous measurement of temperature and strain, the characteristics of stimulated Brillouin scattering in small-mode optical fiber under small signal model are studied by non-iterative backward difference method. The causes of inter-mode dispersion and the slow light effect of stimulated Brillouin scattering in MIMO systems are analyzed. The feasibility of compensation for inter-mode dispersion by using the slow light effect of stimulated Brillouin scattering is discussed. The results show that when LP11 mode acts as Stokes light, the dispersion between modes can be compensated completely by the slow light effect, and the dispersion values of different modes caused by the variation of transmission signal, external interference and irregularity of optical fiber, etc., can be compensated completely by the slow light effect, when the LP11 mode acts as the Stokes light in the optical fiber. When the system structure is invariant, only the input pump parameters can be changed to compensate the dispersion matching between the two modes. This design has high flexibility, wide range of application, and has certain practical value.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253;TP212

【参考文献】