We propose a novel technique based on optical time domain reflectometry for characterizing the losses of transmission modes along few-mode fiber links. The technique estimates the transfer matrix at a crosstalk-inducing point from the measured backscattered waveforms and then eliminates the crosstalk influence of the point on the waveforms. Waveforms that are free from the crosstalk influence enable us to obtain the true losses independently of the crosstalk-inducing point. A proof-of-concept demonstration is performed on an optical fiber with a crosstalk-inducing splice and a bend, and the results show the usefulness of the proposed technique.

中文翻译：

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基于光学时域反射仪的带串扰感应点的少模光纤链路中每种模式的损耗测量

我们提出了一种基于光时域反射仪的新颖技术，用于表征沿少模光纤链路的传输模式的损耗。该技术从测得的反向散射波形估计出一个在产生串扰的点处的传输矩阵，然后消除该点对波形的串扰影响。不受串扰影响的波形使我们能够独立于串扰感应点获得真实的损耗。在具有串扰感应接头和弯曲的光纤上进行了概念验证演示，结果表明了所提出技术的有用性。