双向抽运光纤拉曼放大器的优化设计算法

Optimal Design Algorithm for Bi-Directionally Pumped Raman Amplifiers

基于双向抽运拉曼放大器的功率耦合方程 ,采用遗传算法和级链的全局收敛的Broyden方法 ,提出一种优化设计不同形式双向抽运宽带光纤拉曼放大器的自动配置算法。该算法的特点是计算速度快、收敛性好、适应面广。通过对单光纤的分布式、具有不同增益要求的分立式以及不同周期的色散管理结构的分布式双向抽运拉曼放大器的设计表明 :在 10THz的增益带宽内 ,放大器的增益平坦度均优于± 0 .6dB ,表明了该算法的可行性。

Based on the standard coupled equations describing bi-directionally pumped fiber Raman amplifiers (BDP-FRAs), a generalized automatic algorithm with the help of genetic algorithm and cascaded global convergent Broyden method is proposed for the design of broadband BDP-FRAs. The main advantages of this algorithm are higher efficiency, easier convergence and wider application. The numerical calculation illustrates that the gain flatness for 10 THz gain bandwidth is well within ±0.6 dB for three kinds of FRAs: discrete amplifiers with different gain values, single-fiber distributed amplifiers and dispersion-managed-fibers distributed amplifiers with different dispersion-managed-periods. These results show the flexibility of our proposed design algorithm. This algorithm provides a common design platform for varied BDF-FRAs and corresponding all-Raman optic-fiber transmission systems.