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基于直接检测的光OFDM系统(DDO-OFDM),实现简单、成本较低,对未来高速光传输具有重要的借鉴价值。而在高速传输中,偏振效应带来OFDM信号展宽及输出偏振态的不同,严重影响系统传输性能。对DDO-OFDM系统中的一阶偏振模色散(PMD)作用机理和数学模型进行分析,结果表明,DDO-OFDM系统中一阶PMD仅对OFDM信号子载波信号幅度附加余弦因子,通过信道均衡,可有效去除此噪声影响,差分群时延为50ps条件下,以10Gb/s的速率在单模光纤传输800km,DDO-OFDM系统Q值为16dB,较色度色散影响下系统性能仅有0.3dB降低。
The direct detection based optical OFDM system (DDO-OFDM) has the advantages of simple implementation, low cost and important reference value for high speed optical transmission in the future. In high-speed transmission, the polarization effect brings about the difference of OFDM signal spreading and output polarization state, which seriously affects the system transmission performance. The first order PMD in DDO-OFDM system is analyzed. The results show that first order PMD in DDO-OFDM system only adds cosine factor to subcarrier amplitude of OFDM signal. Through the channel equalization, The effect of this noise can be effectively removed. The differential group delay is 50ps, the transmission rate of single-mode optical fiber is 800km at 10Gb / s, and the Q value of DDO-OFDM system is 16dB. The system performance is only 0.3dB under the influence of chromatic dispersion reduce.