偏振模耦合分布式光纤传感器的数值色散补偿  

Numerical Dispersion Compensation for Polarization-Mode Coupling Distributed Fiber Sensors

作　　者：陈信伟[1] 张红霞[1] 贾大功[1] 刘铁根[1] 张以谟[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《光学学报》2010年第11期3159-3163,共5页Acta Optica Sinica

基　　金：国家973计划(2010CB327806);国家自然科学基金(60377031);天津市自然科学基金(095CYBJC01300);教育部新教师博士点基金(200800561022)资助课题

摘　　要：从理论和实验两个方面分析并验证了白光偏振耦合分布式保偏光纤传感器探测灵敏度与光纤双折射色散的关系。提出了一种色散补偿耦合强度的计算方法。该方法在忽略光传输中微弱损耗情况下,利用耦合点干涉包络面积在存在双折射色散情况下仍然保持不变这一特性,通过对干涉包络进行希尔伯特(Hilbert)包络提取和最小二乘非线性拟合得到干涉包络的面积,从而获得经过色散补偿后的偏振耦合强度值。实验结果表明,该色散补偿算法具有很高的准确性,尤其对短光纤,绝对偏差小于0.63 dB。The influence of birefringence dispersion on the measurement sensitivity of polarization-mode coupling white light distributed polarization maintaining fiber sensor is analyzed and experimentally investigated.A numerical dispersion compensation algorithm is presented to calculate the coupling strength.The algorithm based on the interferogram envelope area is a constant though there exists the influence of birefringence dispersion on the fiber sensor and the algorithm ignores the optical intensity loss in propagation along the fiber.The interferogram envelope area can be obtained by the Hilbert envelope retrieval and nonlinear least square fitting,and then the polarization coupling strength can be obtained.The experimental result shows that the algorithm has a high accuracy,and the absolute deviation is less than 0.63 dB for short fibers.

关 键 词：光纤光学 分布式光纤传感器 数值色散补偿 双折射色散 偏振模耦合 

分 类 号：TN29[电子电信—物理电子学]