Low-resolution Kramers-Kronig detection system with error-feedback noise shaping  

作　　者：Xiangyong DONG Zhenming YU Hongyu HUANG Kaixuan SUN Kun XU 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Science China(Information Sciences)》2024年第5期255-265,共11页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61821001,62371056);Fund of State Key Laboratory of Information Photonics and Optical Communication BUPT(Grant No.IPOC2021ZT18).

摘　　要：In this paper,we investigated the effects of error-feedback noise shaping(EFNS)on a lowresolution Kramers-Kronig(KK)detection system for the first time.Both 16-ary quadrature amplitude modulation(16-QAM)and 64-ary quadrature amplitude modulation(64-QAM)were considered in the experiment.The carrier tone was added on the transmitter side using the virtual carrier-assisted single sideband(VCA-SSB)method to meet the minimum phase(MP)condition.Under the MP condition,KK detection only needs the intensity of the optical signal to be detected by one photodiode(PD)to retrieve the phase information.However,the virtual carrier tone increases the carrier-to-signal power ratio(CSPR),which results in a high peak-to-average power ratio(PAPR)at the transmitter,causing an increase in quantization noise.To mitigate quantization noise in the low-resolution KK detection system,EFNS was applied.The application of EFNS increased the optimal CSPR of the KK detection system and improved receiver sensitivity.Using a 4-bit DAC and the EFNS,80 km transmission was achieved in the 60-Gbit/s 64-QAM KK detection system.

关 键 词：optical fiber communications Kramers-Kronig receiver error-feedback noise shaping quantization noise carrier-to-signal power ratio 

分 类 号：TN929.11[电子电信—通信与信息系统]