具有不同色散分布链路的高速CO-OFDM系统中非线性损伤的研究

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1200 ps/nm时，最大Q因子提高了4 dB，非线性阈值提高了4 dBm，1200 ps/nm时性能几乎和无色散补偿系统相同。

Abstract

Due to the high peak-to-average power ratio (PAPR) and the very close sub-carrier spacing for coherent optical orthogonal frequency division multiplexing (CO-OFDM) system, the sub-carriers walking-away resulted by link dispersion greatly affects the nonlinear damage of the optical fiber. We firstly study the nonlinear damage and system performance of CO-OFDM system without/with dispersion compensating optical fiber (DCF) under the conditions of different distributions of dispersion and different residual dispersion. For the single channel 40 Gb/s CO-OFDM system, the Q factor of DCF link is 5.1 dB higher than that of completely compensated DCF link. For DCF link, when the residual dispersion is added from 0 to 1200 ps/nm, the maximum Q factor is improved by 4 dB, and the nonlinear threshold is increased by 4 dBm. When the residual dispersion is 1200 ps/nm, the performance of DCF link system is almost the same as the system without DCF.

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刘学君, 栾海英, 陈雯柏, 戴波, 刘建东, 朱琳. 具有不同色散分布链路的高速CO-OFDM系统中非线性损伤的研究[J]. 激光与光电子学进展, 2014, 51(2): 020601. Liu Xuejun, Luan Haiying, Chen Wenbai, Dai Bo, Liu Jiandong, Zhu Lin. Fiber Nonlinearity Impairments for CO-OFDM Systems with Different Dispersion Distribution Link[J]. Laser & Optoelectronics Progress, 2014, 51(2): 020601.

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