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一、引言 随着因特网的普及,人们对通信容量的需求在迅速增加。为了满足人们对通信容量不断增长的需求,一些新的通信技术和设备应运而生。密集波分复用技术的诞生大大提高了单根光纤的通信容量,现在已经成为人们提高光纤通信容量的重要手段。而采用该技术去提升光纤的通信容量需要从两方面着手:一方面是增加光纤的波分复用的信道数目,另一方面是提高单个信道的传输速率。由于受光纤性能和光学设备性能的限制,目前单纯地提高单个信道的传输速率已经越来
I. INTRODUCTION With the popularization of the Internet, people’s demand for communication capacity is rapidly increasing. In response to the growing demand for communications capacity, some new communications technologies and devices have emerged. The birth of dense wavelength division multiplexing technology has greatly increased the communication capacity of a single optical fiber, and now it has become an important means for people to increase the capacity of optical fiber communication. The use of this technology to enhance the optical fiber communication capacity needs to start from two aspects: on the one hand to increase the optical fiber wavelength division multiplexing channel number, on the other hand is to improve the transmission rate of a single channel. Due to the limitations of the performance of optical fibers and the performance of optical devices, at present, simply increasing the transmission rate of a single channel has come