长距离高灵敏度偏振复用码的PDKEEPAAA- OTDR
High Sensitivity ϕ-OTDR over Long Distance with Polarization Multiplexed Codes
摘要：
新引入的偏振分集探测码的建议，以提高差分相位敏感分布式OTDR系统的灵敏度和带宽性能。这是最近证明了通过短长度的专用光纤与反向散射引起的等距光纤布拉格光栅插入在光纤本身。在这封信中总结的工作的目的是扩展的偏振分集探测技术，广泛传播的标准单模光纤（SSMF）用于电信，通过单独利用瑞利后向散射。实现完美的相位估计沿这样的光纤的条件首先详细说明。实验验证突出的能力，检测和本地化，超过25公里的SSMF，在475赫兹带宽内的多个低能量扰动。
英文摘要：
Newly introduced polarization diversity probing codes are suggested to enhance the sensitivity and bandwidth performance of differential phase-sensitive distributed OTDR systems. This was recently demonstrated by means of short-length specialized fibers with a backscattering induced by equally spaced Fiber Bragg Gratings inserted in the fiber itself. The work summarized in this letter aims to extend the polarization-diversity probing technique to widely spread standard single mode fibers (SSMF) used for telecommunications, by solely exploiting the Rayleigh backscattering. Conditions to achieve perfect phase estimation along such fibers are first detailed. An experimental validation highlights the ability to detect and localize, over 25km of SSMF, multiple low-energy perturbations within a 475Hz-bandwidth.
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