Enhanced performance of PS-256QAM-OFDM for optical access network
Enhanced performance of PS-256QAM-OFDM for optical access network
复制标题
光接入网络 PS-256QAM-OFDM 的增强性能
DOI：
10.1016/j.optcom.2020.125566
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发表时间：
2020-07
影响因子：
2.4
通讯作者：
Wu Kaiquan
中科院分区：
文献类型：
--
作者：
Ma Jie;He Jing;Chen Ming;Liu Yi;Zhou Zhihua;Wu Kaiquan
为了提高光接入网的通信容量和接收机灵敏度，研究了在低成本的强度调制直接检测（IM-DD）系统中采用恒幅零自相关序列（CAZAC）辅助的概率成形正交频分复用（PS-OFDM）技术。由于PS-OFDM采用了256-QAM调制，可以显著提高频谱效率和成形增益。此外，本文还从接收机灵敏度和可达信息速率（AIR）两个方面对概率成形方案和传统方案进行了比较。实验结果表明，概率整形OFDM方案的性能优于传统OFDM方案。在6.0 bits/QAM符号的相同速率下，采用CAZAC预编码辅助的概率整形，可以实现接收机灵敏度和AIR的2.0 dB性能改善。同时，该方案可以实现2.45-Gbit/s/λ的容量提升。此外，30.61-Gbit/s/λ PS-256QAM-OFDM可以在BER低于10 − 6的情况下实现20公里单模光纤（SMF）传输。
In this paper, to increase communication capacity and improve receiver sensitivity for optical access networks, probabilistically-shaped orthogonal frequency division multiplexing (PS-OFDM) assisted by constant amplitude zero autocorrelation sequence (CAZAC) is investigated in cost-effective intensity-modulation and direct-detection (IM-DD) system. Since 256-QAM is adopted in PS-OFDM, it can significantly improve spectral efficiency and shaping gain Moreover, we compared the probability shaping scheme with the traditional scheme in the terms of receiver sensitivity and achievable information rate (AIR). Experimental results demonstrate that the performance of probabilistically-shaped OFDM scheme outperforms the traditional OFDM scheme. At the same rate of 6.0 bits/QAM symbol, 2.0-dB performance improvement in both receiver sensitivity and AIR can be achieved employing probabilistic shaping assisted by CAZAC precoding. Meanwhile, a 2.45-Gbit/s/λ capacity increase can be achieved with the proposed scheme. In addition, a 30.61-Gbit/s/λ PS-256QAM-OFDM can achieve 20km single-mode fiber (SMF) transmission at BER below 10− 6.
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