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通过数值求解多脉冲耦合的广义非线性薛定谔方程组,对强色散管理准线性光纤传输信道内的非线性效应进行了详细的分析与讨论。比较了不同码型、不同传输功率及不同传输码率情况下信道内四波混频(IFWM)相对于信道内互相位调制(IXPM)和自相位调制(SPM)对传输的影响程度。结果表明,高码率情况下,IFWM对传输的影响最大,SPM的影响最小;随着码率的降低,IFWM及IXPM的影响减弱,SPM的影响相对增强;在码率确定的情况下,随着传输功率的增大,IFWM增强速度最快,IXPM居中,SPM增强速度较慢。将脉冲预展宽应用于强色散管理准线性传输,表明通过大范围的脉冲预展宽可有效地抑制IFWM等信道内非线性效应。
By solving the generalized nonlinear Schr 谔 dinger equation of multi-pulse coupling by numerical solution, the nonlinear effect in the strong dispersion management quasi-linear optical fiber transmission channel is analyzed and discussed in detail. The effects of four-wave mixing (IFWM) in channels with different modulation types, different transmission powers and different transmission bit rates on transmission of phase-independent modulation (IXPM) and self-phase modulation (SPM) are compared. The results show that the IFWM has the most influence on the transmission and the SPM has the least impact on the high code rate. With the decrease of the code rate, the influence of IFWM and IXPM is weakened, and the influence of SPM is relatively enhanced. With the code rate determined, The transmission power increases, IFWM enhanced the fastest, IXPM center, SPM enhanced slower. The application of pulse pre-width to the strong dispersion management quasi-linear transmission, indicating that a wide range of pulse pre-width can effectively suppress IFWM channel non-linear effects.