共轭孪生波抑制WDM系统非线性损伤的仿真
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摘要
WDM系统中的非线性效应制约着该系统的传输性能及容量,针对此问题提出了频域共轭和时域共轭两类共轭孪生波方案,用于提高WDM系统的非线性容限。理论分析了共轭孪生波抑制光纤非线性的原理。利用Optisystem软件搭建仿真平台,设置不同的传输速率、复用间隔和信道数,通过仿真不同的入纤功率来研究两类共轭方案对系统的影响。仿真结果表明:两类方案可有效提高WDM系统对光纤非线性的容忍度,且与时域方案相比,频域方案具有更好的非线性容限;信道数量会影响共轭孪生波对光纤非线性的抑制作用,当复用信道数较多时,其有效性降低。
The nonlinear effects of WDM system limit the transmission performance and capacity of the system. For this problem, the paper presents two conjugated twin waves schemes: frequency-domain conjugation and time-domain conjugation for improving the nonlinear tolerance of WDM system. The principle of conjugated twin waves restraining fiber nonlinearity is analyzed theoretically. The paper builds the simulation platform with Optisystem software, and through the platform different bit rates, multiplex intervals and channels can be set, and the influence of two conjugated schemes on the system is studied by simulating different fiber power. The simulation results show that the two schemes can effectively improve the tolerance of WDM system for fiber nonlinearity, and the frequency-domain scheme has better nonlinear tolerance than the time-domain scheme. The number of channels will affect the suppression of conjugated twin waves to fiber nonlinearity. When the numbers are large, the suppression decreases.
The nonlinear effects of WDM system limit the transmission performance and capacity of the system. For this problem, the paper presents two conjugated twin waves schemes: frequency-domain conjugation and time-domain conjugation for improving the nonlinear tolerance of WDM system. The principle of conjugated twin waves restraining fiber nonlinearity is analyzed theoretically. The paper builds the simulation platform with Optisystem software, and through the platform different bit rates, multiplex intervals and channels can be set, and the influence of two conjugated schemes on the system is studied by simulating different fiber power. The simulation results show that the two schemes can effectively improve the tolerance of WDM system for fiber nonlinearity, and the frequency-domain scheme has better nonlinear tolerance than the time-domain scheme. The number of channels will affect the suppression of conjugated twin waves to fiber nonlinearity. When the numbers are large, the suppression decreases.
引文
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[2]沈宁航,杜建新,许悦.相干16-QAM DWDM系统四波混频噪声理论与仿真研究[J].光通信技术,2017,41(1):15-18.
[3]LIU X,WEI X,SLUSHER R E,et al.Improving transmission performance in differential phase-shift-keyed systems by use of lumped nonlinear phase-shift compensation[J].Optics Letters,2002,27(18):1616-1618.
[4]HO K-P,KAHN J M.Electronic compensation technique to mitigate nonlinear phase noise[J].Lightwave Technol,2004,22(3):779-783.
[5]ROBERTS K,LI C,STRAWCZYNSKI L,et al.Electronic precompensation of optical nonlinearity[J].IEEE Photonics Technology Letters,2006,18(2):403-405.
[6]JOHANNISSON P,SJO¨DIN M,KARLSSON M,et al.Cancellation of nonlinear phase distortion in self-homodyne coherent systems[J].IEEEPhotonics Technology Letters,2010,22(11):802-804.
[7]IP E,KAHN J M.Compensation of dispersion and nonlinear impairments using digital back propagation[J].Lightwave Technol,2008(26):3416-3425.
[8]MATEO E F,ZHU L,LI G.Impact of XPM and FWM on the digital implementation of impairment compensation for WDM transmission using backward propagation[J].Optics Express,2008,16(20):16124-16137.
[9]LIU X,CHRAPLYVY A R,WINZER P J,et al.Phase-conjugated twin waves for communication beyond the Kerr nonlinearity limit[J].Nature Photonics,2013,7(7):560-568.
[10]LIU X,CHANDRASEKHAR S.Fiber-nonlinearity-tolerant superchannel transmission via nonlinear noise squeezing and generalized phase-conjugated twin waves[J].Lightwave Technol,2014,32(4):766-775.