面向下一代灵活光网络的数字相干光传输技术

摘要

In order to satisfy the service demands with different granularities and maximize the spectral efficiency of wavelength division multiplexing transmission,the optical network is evolving to agile and energy-efficient one.Con-sequently,the flexible optical transmission techniques based on bandwidth variable transceivers (BVT) have attrac-ted worldwide attention and research interest.We review recent progresses of flexible optical transmission techniques including transmitter-side adaptive modulation,variable bit-rate loading and receiver-side corresponding modulation formats identification.Finally,we outline the prospects and future challenges in this area.%为了适应不同颗粒度的业务需求,最大化波分复用传输系统的频谱效率,光网络正逐渐朝着更灵活、高效、节能的趋势发展.基于带宽可变收发机(BVT)的灵活光网络传输技术因而得到了广泛的关注与研究.本文概述了国内外支持灵活光网络的数字相干光传输技术的最新研究进展,包括发射端支持传输速率可变的自适应编码、调制技术以及接收端相应的调制码型识别技术,最后对灵活光网络传输的未来研究方向进行了展望.