一、前言近年来,由于光纤传输损耗的大幅度降低,发光器件和光电器件性能的改善,光学无源器件的出现以及光缆光纤连接耦合等具体技术问题的逐步解决,已把光纤通信推向了实用化的试验阶段。但是,在光纤制造和成缆过程中,特别是通信线路的架设和使用过程中,有可能发生光纤的断裂,影响通信的正常进行,甚至使通信中断。因此,在工程上寻找一种探测光 I. Introduction In recent years, due to the substantial reduction of optical fiber transmission loss, the improvement of the performance of light emitting devices and optoelectronic devices, the emergence of optical passive devices and the coupling of optical fiber cables and other specific technical problems, optical communication has been pushed Practical test phase. However, in the optical fiber manufacturing and cabling process, especially during the erection and use of communication lines, fiber breakage may occur, which may affect the normal communication and even interrupt the communication. Therefore, in engineering looking for a probe light