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一、引言 随着科学技术的迅猛发展，通信领域信息的传送量正以一种加速度的形式膨胀。信息时代要求容量越来越大的传输网络。当承载长途传输使用的光纤都已经被占用时，承载商首先考虑的绝不是按原有路由增放一条新的光缆，而是尽可能利用已有的光纤进行扩容。 近几年来，世界
I. INTRODUCTION With the rapid development of science and technology, the transmission of information in the field of communications is expanding in the form of an acceleration. The information age requires larger and larger transmission networks. When the fibers used for long-distance transmission are already occupied, the carrier should not consider adding a new optical fiber according to the original route first. Instead, it uses the existing optical fiber as much as possible for capacity expansion. In recent years, the world