中国光学（中英文）2024，Vol.17Issue(4)：950-958,9.DOI:10.37188/CO.2023-0230
基于实虚交替导频的CO-OFDM-OQAM通信系统激光器相位噪声抑制方法
Laser phase noise suppression method for a CO-OFDM-OQAM communication system with real-imaginary-alternate pilots
摘要
Abstract
A phase noise suppression algorithm based on real-imaginary-alternate pilots was proposed for a coherent optical orthogonal frequency division multiplexing communication system with offset quadrature amplitude modulation(CO-OFDM-OQAM).The algorithm uses the properties of laser phase noise and the intrinsic imaginary interference(IMI)symmetry law to design real-imaginary-alternate pilots.In combina-tion with a linear fitting,it can accurately estimate the common phase error(CPE)for CO-OFDM-OQAM.As the compensation was performed in the frequency domain,the computational complexity was signific-antly reduced compared to the time-domain phase noise suppression algorithms.A numerical simulation plat-form was built for a polarization multiplexed CO-OFDM-OQAM system with an effective bit rate of 65 GBits/s.Through it,the transmission performance of the system with different laser linewidths and num-bers of subcarriers was studied,and the suppression effect of the proposed method on phase noise was ex-amined.The results obtained confirm that the linewidths required to reach the FEC limit for BER are equal to 801.1,349,and 138.4 kHz for a fixed OSNR of 25 dB and a total number of subcarriers of 256,512,and 1024,respectively.For the system using a 16-QAM modulation format with 256 or 512 subcarriers,it com-pensates well for the laser phase noise without affecting the power peak-to-average ratio.关键词
偏振复用/相位噪声/正交频分复用/光通信系统Key words
polarization-division-multiplexing/phase noise/orthogonal frequency division multiplexing/op-tical communication system分类
信息技术与安全科学引用本文复制引用
赵航宇,王道斌,张硕,黄全盛,温坤,李广富,元丽华..基于实虚交替导频的CO-OFDM-OQAM通信系统激光器相位噪声抑制方法[J].中国光学（中英文）,2024,17(4):950-958,9.基金项目
国家自然科学基金(No.62141505,No.61367007) （No.62141505,No.61367007）
甘肃省自然科学基金(No.20JR10RA154)Supported by National Natural Science Foundation of China(No.62141505,No.61367007) （No.20JR10RA154）
Natural Science Foundation of Gansu Province(No.20JR10RA154) （No.20JR10RA154）
