Terabit-per-Second Coherent Optical Fiber Communications

光纤通信系统在整个全球电信网络中被广泛使用，以提供商业、教育、医疗保健和娱乐部门的几乎所有服务。对这些服务不断增长的需求，其中许多直到最近还无法想象，正在推动该网络以惊人的速度扩展，并已将最先进的商业系统的每通道光信号比特率推高至100Gbit/S。这些系统是由基于相干检测和数字信号处理的根本不同的方法实现的。每通道比特率为400Gbit/S的下一代系统目前正在开发中，未来对1Tbit/S的比特率的需求被认为是肯定的。

Optical fiber communication systems are used extensively throughout the global telecommunications network to provision virtually all services in the business, educational, healthcare and entertainment sectors. The rising demand for these services, many of which were unimaginable until recently, is driving the expansion of this network at dramatic rates and has pushed the per-channel bit rate of optical signals to 100 Gbit/s for state-of-the-art commercial systems. These systems are enabled by a fundamentally different approach based on coherent detection and digital signal processing. Next generation systems with a per-channel bit rate of 400 Gbit/s are currently being developed, and the need for a bit rate of 1 Tbit/s in the future is seen as certain.