Kramers-Kronig接收机的技术问题和实用性探究(特邀)  

Technical Issues and Practical Implementation of Kramers-Kronig Receiver

作　　者：薄天外 Hoon Kim Bo Tian-wai;Hoon Kim(School of Electrical Engineering,KAIST,Daejeon 34141,South Korea)

机构地区：[1]韩国科学技术院电子工程学院

出　　处：《光通信研究》2019年第6期63-68,共6页Study on Optical Communications

基　　金：Korea IITP(2017-0-00702);Korea NRF(2019R1A2C2005367)

摘　　要：Kramers-Kronig(KK)接收机能从光信号的强度信息中重建相位信息,突破了单个光探测器只能检测和处理光信号强度信息的局限,是近年来光通信系统的一个研究热点。该接收机可以补偿光纤色散带来的损伤,降低系统对载波功率比的要求,能显著地提高接收机灵敏度,大大增加了系统容限和传输距离。在接收端仅用单个光探测器,极大地降低了同时检测光信号强度和相位的成本,在成本敏感的数据中心之间的光互联网络中有着光明的应用前景。然而,该接收机也存在着一定的技术问题,这可能会阻碍其在实际系统中的应用。文章介绍了KK接收机的原理和应用,对其技术问题和解决方案进行了系统地分析。同时,文章也从实用化角度出发,介绍了该接收机方案在实际系统中遇到的挑战,总结了现有的解决方案。最后,文章对该接收机未来的研究方向进行了探讨。Kramers-Kronig(KK)receiver can retrieve the phase information from the intensity information of an optical signal satisfying the minimum-phase condition.This enables KK receiver to overcome the limitation that single photodetector can only detect the intensity information of an optical signal,thus it has attracted a great deal of attention.KK receiver can compensate for the distortion due to fiber chromatic dispersion and reduce the required carrier-to-signal power ratio in an optical transmission system,significantly increasing the channel capacity and transmission distance.Since only a single-end photodetector is used,it reduces the implementation cost of a coherent optical receiver.This makes KK receiver a very promising candidate technology for the cost-sensitive intra-datacenter interconnections.However,this receiver has a couple of technical issues hindering its practicality.In this paper,the principles and applications of KK receiver,as well as its technical issues and solutions are discussed.Meanwhile,the challenges in the practical implementation of this receiver are investigated as well.Finally,the prospect of related research is discussed briefly.

关 键 词：光纤通信系统 数字信号处理 光电接收机 

分 类 号：TN914[电子电信—通信与信息系统]