高速相干光正交频分复用系统实现方案研究

相干光正交频分复用系统（Coherent Optical Orthogonal Frequency Division Multiplexing, CO-OFDM）作为未来高速光通信的重要解决方案，是近年来光传输领域的研究热点。高速CO-OFDM系统需要较高带宽的模数/数模转换器（DAC/ADC），目前技术水平难以达到。文章改进了正交频带复用技术（Orthogonal Band Multiplexing , OBM）的光域实现方案；结合偏振复用技术和偏振分集接收，提出了基于OBM的100Gb/s高速CO-OFDM系统；并对系统传输性能进行数字仿真。结果表明：基于OBM技术的MIMO CO-OFDM系统可有效降低对DAC/ADC的处理速度要求，在不需任何在线色散补偿和偏振控制器件条件下，通过单模光纤传输800km，系统Q值保持在13dB以上。

Implementation for high-speed coherent optical orthogonal frequency division multiplexing system

Coherent optical orthogonal-frequency-division-multiplexing(CO-OFDM) has drawn more attention in optical transmissions as an attractive modulation format for the forthcoming 100 Gb/s Ethernet. However,CO-OFDM system requires high-speed digital-to-analog converters(DAC) and analog-to-digital converters(ADC),which may not be available today.To resolve ADC/DAC bandwidth bottleneck,with the help of orthogonal-band-multiplexing(OBM) and polarization division multiplexing(PDM),100 Gb/s COOFDM system based on OBM is presented.With this scheme,simulation is done to validate the feasibility of the system model and algorithm.The result shows that the performance of MIMO CO-OFDM system based on OBM is maintained above 13 dB at 0 GHz channel spacing for 800 km standard single mode fiber (SSMF) transmission without any inline dispersion compensation and polarization controller(PC) and the DAC/ADC do not need to operate at extremely high sampling rate.