Optimized digital backward propagation for phase modulated signals in mixed-optical fiber transmission link.
Optimized digital backward propagation for phase modulated signals in mixed-optical fiber transmission link.
复制标题
混合光纤传输链路中相位调制信号的优化数字后向传播。
作者：
R. Asif;Chien;Michael Holtmannspoetter;B. Schmauss
提出了用于减轻光纤传输损伤的数字反向传播（DBP）算法的参数优化，并针对混合光纤传输链路中的相位调制信号进行了数值演示。色散 (D) 和非线性系数 (γ) 等参数的优化可提高眼图张开度 (EO)。我们研究了迭代和非迭代对称分步傅立叶方法 (S-SSFM) 的优化，以求解逆非线性薛定谔方程 (NLSE)。优化的 DBP 算法，步长等于光纤模块长度，即每个光纤跨度一个计算步骤，以获得更高的计算效率，在接收器上作为数字信号处理 (DSP) 模块实现。系统性能通过各种在线补偿方案的 EO 改进进行评估。使用计算高效的非迭代对称分步傅里叶方法 (NIS-SSFM)，根据混合光纤传输链路中各个光纤类型的特性，通过优化和修改 DBP 算法参数，可以在 6 dBm 信号发射功率下获得高达 3.6 dB 的参考 EO 改进。
The parametric optimization of Digital Backward Propagation (DBP) algorithm for mitigating fiber transmission impairments is proposed and numerically demonstrated for phase modulated signals in mixed-optical fiber transmission link. The optimization of parameters i.e. dispersion (D) and non-linear coefficient (γ) offer improved eye-opening (EO). We investigate the optimization of iterative and non-iterative symmetric split-step Fourier method (S-SSFM) for solving the inverse non-linear Schrödinger equation (NLSE). Optimized DBP algorithm, with step-size equal to fiber module length i.e. one calculation step per fiber span for obtaining higher computational efficiency, is implemented at the receiver as a digital signal processing (DSP) module. The system performance is evaluated by EO-improvement for diverse in-line compensation schemes. Using computationally efficient non-iterative symmetric split-step Fourier method (NIS-SSFM) upto 3.6 dB referenced EO-improvement can be obtained at 6 dBm signal launch power by optimizing and modifying DBP algorithm parameters, based on the characterization of the individual fiber types, in mixed-optical fiber transmission link.