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Design of 1-μm-band mode-detection OTDR for 40 km range measurement and its performance evaluation

机译：用于40 km距离测量的1-μm波段模式检测OTDR的设计及其性能评估

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This paper clarifies the requirements for applying 1-mu m-band mode-detection optical time domain reflectometry (OTDR) to the loss monitoring of trunk cables with the goal of detecting slight changes in macro/micro-bending that are missed by conventional OTDR. In light of the requirements, the measurement system is enhanced through the use of coherent detection to fulfill the required range performance. Moreover, the enhanced system modulates the optical frequency and the state of polarization of the probe light during the measurement to suppress amplitude fluctuations in the backscattered waveforms. A field test is carried out to confirm the performance of the enhanced measurement system. The results demonstrate that the measurement range of over 40 km is achieved while amplitude fluctuations are reduced to as low as 0.02 dB.
机译：本文阐明了将1-μm波段模式检测光时域反射仪（OTDR）应用于干线电缆损耗监测的要求，目的是检测常规OTDR遗漏的宏/微弯曲的细微变化。根据要求，可以通过使用相干检测来增强测量系统，以实现所需的范围性能。此外，增强型系统在测量过程中调制探测光的光频率和偏振状态，以抑制反向散射波形的幅度波动。进行现场测试以确认增强型测量系统的性能。结果表明，可以实现超过40 km的测量范围，同时幅度波动可降低至0.02 dB。

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