Journal
SCIENCE CHINA-INFORMATION SCIENCES
Volume 64, Issue 8, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11432-020-3025-4
Keywords
N-level pulse amplitude modulation (PAM-N); M-ary quadrature amplitude modulation (M-QAM); BER computation; single-sideband (SSB); Kramers-Kronig receiver
Funding
- National Key Research and Development Program of China [2019YFB1803905]
- National Natural Science Foundation of China [61871030, 61671053]
- Fundamental Research Funds for the Central Universities [FRF-MP-19-009]
- State Key Laboratory of Advanced Optical Communication Systems Networks, China
- Open Fund of IPOC (BUPT) [IPOC2018B009]
- Foundation of Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services
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This paper studies and compares the theoretical bit error rate (BER) of N-level PAM and M-QAM under different scenarios. Mathematical BER equations, including OSNR and CSPR, are provided for PAM signals. Simulation results show that the BER evaluation methods can serve as a theoretical guidance and system assessment criteria for SSB scenarios.
In this paper, the theoretical bit error rate (BER) of N-level pulse amplitude modulation (PAM-N) 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 signals. To verify the validity of our theoretical expressions for SSB systems, transmissions with 224-Gb/s SSB-PAM4/16QAM 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) and 120-km transmission scenarios, which showed that the BER evaluation methods can serve as a theoretical guidance and system assessment criteria for SSB scenarios.
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