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由于相干光正交频分复用(CO-OFDM)系统很高的峰均功率比(PAPR)以及非常近的子载波间隔,使得链路色散导致的子载波走离对光纤非线性损伤的影响更加明显。研究了不同色散分布、不同残余色散情况下,无色散补偿光纤(DCF)和有色散补偿光纤的光纤链路时CO-OFDM系统的非线性损伤以及系统性能。针对单信道40 Gb/s CO-OFDM系统,无DCF链路比完全补偿DCF链路,Q因子高5.1 dB;对于DCF链路,当残余色散从0变为到1200ps/nm时,最大Q因子提高了4dB,非线性阈值提高了4 dBm,1200ps/nm时性能几乎和无色散补偿系统相同。
Due to the high peak-to-average power ratio (PAPR) of the coherent optical orthogonal frequency division multiplexing (CO-OFDM) system and the very close subcarrier spacing, the influence of the subcarrier dispersion caused by the link dispersion on the nonlinear damage of the fiber more obvious. The nonlinear damage and the system performance of the CO-OFDM system with different dispersion distributions and different residual dispersions in the fiber link without dispersion compensation fiber (DCF) and with dispersion compensation fiber are studied. For a single-channel 40 Gb / s CO-OFDM system, a DCF link without loss of power compensates for the DCF link completely and has a Q factor of 5.1 dB. For the DCF link, when the residual dispersion changes from 0 to 1200 ps / nm, the maximum Q factor Increased by 4dB, nonlinear threshold increased by 4 dBm, 1200ps / nm almost no dispersion compensation system with the same performance.