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相干光正交频分复用系统(CO-OFDM,Coherent Optical Orthogonal Frequency Division Multiplexing)可有效抑制光纤色度色散和偏振模色散,有望成为解决未来高速光传输的主流方案。这里结合光传输理论及正交频分复用系统(OFDM,Orthogonal Frequency Division Multiplex)技术原理,对CO-OFDM系统方案实现及信道等效模型进行了分析,通过数字仿真验证系统光调制器偏置点选择及信号均衡算法。理论分析和仿真结果表明,CO-OFDM系统采用单抽头频域均衡,可有效抑制光纤色散效应。光调制器偏置点选择在零点,可实现系统对OFDM信号的最佳线性调制,与传统强度调制/直接检测(IM/DD)系统比较,CO-OFDM系统品质因子有10 dB提高。
Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) can effectively suppress the chromatic dispersion and polarization-mode dispersion of fiber, and is expected to be the mainstream solution to the future high-speed optical transmission. In this paper, the realization of the CO-OFDM system and the channel equivalent model are analyzed based on the optical transmission theory and Orthogonal Frequency Division Multiplex (OFDM) technology. The digital optical system is used to verify the system optical modulator bias Point selection and signal equalization algorithm. Theoretical analysis and simulation results show that the CO-OFDM system uses single-tap frequency-domain equalization, which can effectively suppress the fiber dispersion effect. The optical modulator bias point is selected at zero to achieve optimal linear modulation of the OFDM signal by the system. The quality factor of the CO-OFDM system is improved by 10 dB compared with the traditional IM / DD system.