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提出了一种适用于强度调制直接检测(IM/DD)光系统的信号调制格式。这种基于Nyquist脉冲half cycle副载波调制(SCM)信号能有效提高频谱效率,为了减少传递函数引起的系统的性能恶化,采用了数字预均衡和后均衡实现对光纤损伤的补偿;建立了偏振复用(PDM)IM/DD系统平台,分析了Nyquist脉冲SCM信号在系统中的PAPR性能,实现了72Gbit/s 64-QAM Nyquist脉冲SCM信号经过20km标准单模光纤(SMF)传输后其误码性能小于前向纠错(FEC)阀值3.8×10-3。
A signal modulation format suitable for direct modulation of intensity modulation (IM / DD) optical system is proposed. This Nyquist pulse half cycle Subcarrier Modulation (SCM) signal can effectively improve the spectral efficiency. In order to reduce the system performance degradation caused by the transfer function, digital pre-equalization and post-equalization are used to compensate the optical fiber damage. A polarization complex The PAPR performance of the Nyquist pulse SCM signal in the system was analyzed by the (PDM) IM / DD system platform. The error performance of the 72Gbit / s 64-QAM Nyquist pulse SCM signal after passing through the 20km standard single mode fiber (SMF) Less than the forward error correction (FEC) threshold 3.8 × 10-3.