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Low-resolution kramers-kronig detection system with error-feedback noise shaping

Science China(Information Sciences) 2024年第5期67卷 259-269页

作者： Xiangyong DONG Zhenming YU Hongyu HUANG Kaixuan SUN Kun XU State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

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

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Theoretical analysis of PAM-N and M-QAM BER computation with single-sideband signal

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Science China(Information Sciences) 2021年第8期64卷 172-181页

作者： Dongxu LU Xian ZHOU Yuqiang YANG Jiahao HUO Jinhui YUAN Keping LONG Changyuan YU Alan Pak Tao LAU Chao LU Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services University of Science and Technology Beijing Department of Electrical Engineering The Hong Kong Polytechnic University Department of Electronic and Information Engineering The Hong Kong Polytechnic University

In this paper, the theoretical bit error rate(BER) of N-level pulse amplitude modulation(PAMN)and M-ary quadrature amplitude modulation(M-QAM) have been studied and compared under different scenarios, including(i) PAM with intensity modulation with direct detection(IM/DD) and field modulation with detection(FMD)(including coherent detection and single-sideband modulation with direct detection(SSB-DD)), and(ii) QAM with coherent detection and SSB-DD. Considering the relationship between the symbol spacing and signal-to-noise ratio(SNR), we provide the mathematical BER equations, including the optical signal-to-noise ratio(OSNR) and carrier-to-signal power ratio(CSPR), especially for PAM *** verify the validity of our theoretical expressions for SSB systems, transmissions with 224-Gb/s SSBPAM4/16 QAM signals using the kramers-kronig(KK) receiver were implemented on a unified optical system platform. The simulation results agreed well with theoretical calculations both in back-to-back(BtB) and120-km transmission scenarios, which showed that the BER evaluation methods can serve as a theoretical guidance and system assessment criteria for SSB scenarios.

关键词： N-level pulse amplitude modulation(PAM-N) M-ary quadrature amplitude modulation(MQAM) BER computation single-sideband(SSB) kramers-kronig receiver

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