面向电力通信的Delta-sigma调制高可靠传输研究  

Research on Highly Reliable Transmission based on Delta-sigma Modulation for Power Communication

作　　者：张俊 芮文君 吕娜 ZHANG Jun;RUI Wenjun;LüNa(East China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Shanghai 200063,China;China Energy Group Taizhou Power Generation Co.,Ltd.,Taizhou 225327,China)

机构地区：[1]中国电力工程顾问集团华东电力设计院有限公司,上海200063 [2]国家能源集团泰州发电有限公司,江苏泰州225327

出　　处：《光通信研究》2025年第1期29-34,共6页Study on Optical Communications

摘　　要：【目的】电力通信专网用于电力系统的调度、运营和管理,其重要特点是高度的可靠性和实时性。当前电力通信专网的典型中继距离为40 km,为了进一步提升其可靠性,可以增加单光口传输距离和减少光放大器数量,从而减少潜在故障点。【方法】文章提出了一种基于Delta-sigma调制的高保真度数字传输方法,在发射端利用过采样、噪声整形和两电平量化等方法,将原始高阶调制信号转化成正交相移键控(QPSK)的光域波形,以大幅提升传输过程中对链路噪声和非线性的抵抗能力。在接收端通过符号判决移除链路噪声,再利用低通滤波器消除整形后的带外量化噪声,最终实现原始信号的低复杂度解调。【结果】在验证性离线实验中,经过160 km标准单模光纤的无中继传输和相干检测后,50 GBaud偏振复用QPSK光域波形可以实现无误码传输。解调后的原始高阶调制信号在9倍过采样下,恢复信噪比(SNR)可以达到33.0 dB,达到32.0 dB的SNR门限,能够支持1024进制正交幅度调制(1024-QAM)信号的高保真传输,单波长比特率为111 Gbit/s。【结论】实验结果表明,Delta-sigma调制方案能够以带宽展宽获取SNR提升,从而有效拓展传输跨距和传输性能,为下一代低成本和高可靠性电力专网提供了潜在的解决方案。【Objective】The dedicated power communication network is used for the dispatch,operation,and management of power systems,with its key characteristics being high reliability and real-time performance.At present,the typical relay distance of the power communication network is 40 km.In order to further improve its reliability,the number of optical amplifiers can be reduced by increasing the transmission distance between two optical nodes,which reduces the potential fault points as well.【Methods】In this work,a high-fidelity digital transmission scheme based on Delta-sigma modulation is proposed.At the transmitter,over-sampling,noise shaping,and two-level quantization are used to map the original high-order modulation signal into Quadrature Phase Shift Keying(QPSK)optical waveform,which improves the tolerance of the link noise and fiber nonlinearity.At the receiver,the link noise is removed by symbol decision,and then the out-of-band quantization noise is suppressed by a low-complexity low-pass filter for the demodulation of the original signal.【Results】In the proof-of-concept experiment,after unrepeated transmission through 160 km standard single-mode fiber and coherent detection,50 GBaud polarization-division-multiplexed QPSK optical waveform can achieve error-free transmission.At 9-times over-sampling,the recovered Signal-to-Noise Ratio(SNR)of original signal can reach 33.0 dB,which satisfies the 32.0 dB SNR threshold and supports high-fidelity transmission of 1024-Quadrature Amplitude Modulation(1024-QAM)signals with a single-wavelength bitrate of 111 Gbit/s.【Conclusion】Experimental results demonstrate that the Delta-sigma modulation scheme can achieve an improvement in SNR through bandwidth broadening,effectively extending transmission reach and performance.This provides a potential solution for the next generation of low-cost and high-reliability dedicated power communication networks.

关 键 词：电力通信 Delta-sigma调制 相干检测 无中继传输 信噪比 

分 类 号：TN929[电子电信—通信与信息系统]