Asif Rameez, Lin Chien-Yu, Holtmannspoetter M, Schmauss Bernhard
Chair for Microwave Engineering and High Frequency Technology, University of Erlangen-Nuremberg Cauerstrasse 9, D-91058 Erlangen, Germany.
Opt Express. 2010 Oct 25;18(22):22796-807. doi: 10.1364/OE.18.022796.
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.
针对混合光纤传输链路中的相位调制信号，提出并通过数值模拟验证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。参数即色散（D）和非线性系数（γ）的优化可改善眼图张开度（EO）。我们研究了用于求解非线性薛定谔方程（NLSE）逆方程的迭代和非迭代对称分步傅里叶方法（S-SSFM）的优化。优化后的DBP算法，其步长等于光纤模块长度，即在每个光纤跨度进行一步计算以获得更高的计算效率，在接收机处作为数字信号处理（DSP）模块实现。通过不同在线补偿方案的眼图张开度改善来评估系统性能。在混合光纤传输链路中，基于各光纤类型的特性，通过优化和修改DBP算法参数，使用计算效率高的非迭代对称分步傅里叶方法（NIS-SSFM），在6 dBm信号发射功率下可获得高达3.6 dB的参考眼图张开度改善。
