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DPSK调制方式和色散管理孤子(DMS)传输方案相结合的新的传输机制能抵制噪声和非线性损伤,在高速多通道光传输系统中具有突出优点。采用变分法研究同时存在光纤损耗、ASE噪声、孤子互作用等多种扰动因素的DPSK色散管理孤子系统的传输特性,在频域导频滤波控制方案下,导出了孤子各特征参数随传输距离的演化方程。对40 Gb/s长距离DPSK色散管理孤子系统的传输特性进行了数值模拟,其结果和理论分析一致。并通过Optisystem软件作进一步仿真,论证了该系统零频移稳定传输的可行性。
The new transmission mechanism combining DPSK modulation with dispersion management soliton (DMS) transmission schemes can resist noise and nonlinear impairments and has outstanding advantages in high speed multi-channel optical transmission systems. The variational method is used to study the transmission characteristics of the DPSK dispersion management soliton system with many perturbation factors such as fiber loss, ASE noise and soliton interaction. In the frequency-domain pilot filtering control scheme, the characteristic parameters of the soliton with the transmission distance Evolution equation. The transmission characteristics of a 40 Gb / s long-distance DPSK dispersion management soliton system are numerically simulated and the results are consistent with the theoretical analysis. And through Optisystem software for further simulation to demonstrate the feasibility of the system zero-shift stable transmission.