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一、引言单模光纤的研究和应用,促进了单模光纤测量技术的发展。由于光纤衰减是单模光纤系统最重要的参数之一,因此衰减测量技术首先得到了迅速发展。从根本上看,单模光纤的衰减测量方法与多模光纤的衰减测量方法基本相同,而且其注入条件要比多模光纤测量简单,但是鉴于下述理由,对单模光纤衰减测量的要求却高于多模光纤。 (1)单模光纤的衰减比多模光纤小,1.3μm时的典型衰减为0.4～0.7dB/km,1.55μm时的典型衰减为0.2～0.4dB/km,可见单模光纤的衰减大约为多模光纤衰减的
I. Introduction The research and application of single-mode optical fiber has promoted the development of single-mode optical fiber measurement technology. As fiber attenuation is one of the most important parameters in single-mode fiber systems, the attenuation measurement technique first has been rapidly developed. Fundamentally, single-mode fiber attenuation measurement method and multimode fiber attenuation measurement method is basically the same, and its injection conditions than the multi-mode fiber measurement is simple, but for the following reasons, the single-mode fiber attenuation measurement requirements Higher than multimode fiber. (1) The attenuation of single-mode fiber is smaller than that of multi-mode fiber. The typical attenuation at 1.3μm is 0.4 ~ 0.7dB / km, and the typical attenuation at 1.55μm is 0.2 ~ 0.4dB / km. Multimode fiber attenuation