Terabit-per-Second Coherent Optical Fiber Communications

光纤通信系统在全球电信网络中广泛使用，为商业、教育、医疗保健和娱乐行业提供几乎所有服务。对这些服务的需求不断增长，其中许多服务直到最近还无法想象，正在推动该网络以惊人的速度扩展，并将最先进的商业系统的光信号的每通道比特率推高到100 Gbit/s。这些系统通过基于相干检测和数字信号处理的根本不同的方法来实现。目前正在开发每信道比特率为400 Gbit/s的下一代系统，并且可以肯定的是，未来需要1 Tbit/s的比特率。

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.