A novel multi-waveband dispersion compensating fiber based on hybrid photonic crystal fiber

In view of dispersion compensating in multiple wavebands at the same time, this paper proposes a novel multi-waveband dispersion compensating fiber (DCF) based on hybrid photonic crystal fiber (PCF). The proposed fiber can compensate multiple wavebands at the same time. The mechanism of the multi-waveband dispersion compensation is analyzed, and the different material-filled structure is discussed numerically. The simulation results show that the multi-waveband DCF can compensate multiple wavelengths at the same time. By a reasonable design, this fiber can replace the multi-dispersion compensating system composed by cascaded multiple devices, and minimize the loads of the system in an efficient way.     

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。