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一、前言光纤通信技术以十分惊人的速度向前发展。现在光纤通信不仅成功地用于市话中继,而且也成功地用于长途干线。在我国,长、短波长8Mb/s、34Mb/s光缆市话中继系统相继建立,并成功地投入运行。与此同时,34Mb/s、140Mb/s中规摸的光通信系统正在向长途干线发展。就通信距离来看,从几公里发展到几十公里,甚至会延伸到几百公里到几千公里;从无中继站发展到有几十个乃至几百个中继站。为了适应这种中、大规模光通信系统的需要,必须进行如下课题的研究;如何对光缆通信系统进行维护;如何对这种庞大的系统进行监视;为了不使通信中断而如何进行快速倒换;如何对系统运行工况进行实时性地估价;在光路系
I. INTRODUCTION Optical fiber communication technology advances at astonishing speed. Optical fiber communications are now successfully used not only for trunk repeaters, but also for long-haul trunk lines. In our country, long, short wavelength 8Mb / s, 34Mb / s optical fiber telephone relay system have been established, and successfully put into operation. At the same time, 34Mb / s, 140Mb / s optical communication system in the standard touch is to long-distance trunk development. In terms of communication distance, from a few kilometers to tens of kilometers, and even extended to hundreds of kilometers to thousands of kilometers; from no relay station to the development of dozens or even hundreds of relay stations. In order to meet the needs of such medium-sized and large-scale optical communication systems, researches on the following topics must be carried out; how to maintain optical fiber communication systems; how to monitor such large systems; how to quickly switch over so as not to interrupt the communication; How to evaluate the operating conditions of the system in real time; in the optical system