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一、概述1.3μm窗口单模光纤与梯度折射率多模光纤相比,具有衰减低、频带宽等优点。目前,国际上单模光纤已广泛用于中、长距离通信网。国内深圳、秦皇岛、宁波等地已经建成了单模140Mb/s区间光通信系统(无中继距离为26公里左右)。宁汉渝干线140Mb/s光缆数字通信工程即将进入施工图设计阶段,另外一些中长距离单模光缆工程亦已开始或正在计划建设。因此,单模光
I. Overview 1.3μm window single-mode fiber and gradient index multimode fiber compared with the advantages of low attenuation, frequency bandwidth. At present, the single mode optical fibers have been widely used in the medium and long distance communication networks in the world. Domestic Shenzhen, Qinhuangdao, Ningbo and other places have built a single-mode 140Mb / s interval optical communication system (no relay distance of about 26 km). Ninghan-Chongqing Line 140Mb / s optical cable digital communication project is about to enter the construction drawing design phase, while some other long-distance single-mode fiber optic cable project has begun or is planning to build. Therefore, single-mode light