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  

Fiber Nonlinearity Impairments for CO-OFDM Systems with Different Dispersion Distribution Link

作　　者：刘学君[1] 栾海英[2] 陈雯柏[3] 戴波[1] 刘建东[1] 朱琳[1] 

机构地区：[1]北京石油化工学院信息工程学院,北京102617 [2]北京机械工业自动化研究所流体传动与汽车装备技术工程研究中心,北京1001203 [3]北京信息科技大学自动化学院,北京100192

出　　处：《激光与光电子学进展》2014年第2期55-59,共5页Laser & Optoelectronics Progress

基　　金：北京市自然科学基金(4132020);北京石油化工学院校青年基金(N2012-13)

摘　　要：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） 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.

关 键 词：光通信 相干光正交频分复用 光纤非线性损伤 色散分布 色散补偿光纤 

分 类 号：TN913.7[电子电信—通信与信息系统]