宽带光纤拉曼放大器的优化设计与分析

Optimal Design and Analysis of Broadband Fiber Raman Amplifier

基于拉曼放大器的功率耦合方程 ,采用遗传算法和全局收敛的布雷登方法 ,提出一种优化设计不同形式反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。通过对具有不同增益要求的分立式、单光纤分布式以及不同结构的色散管理式宽带拉曼放大器设计表明 :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。通过对由标准单模光纤和色散补偿光纤构成的组合放大单元与色散管理光纤级链组成的放大单元的比较 ,表明色散管理式拉曼放大器具有潜在的应用价值。

Based on the standard coupled equations describing fiber Raman amplifiers (FRAs),a generalized automatic algorithm with the help of Genetic algorithm and global convergent Broyden method is proposed for the design of broadband backward pumped FRAs. The main advantages of this algorithm are higher efficient,easier convergent and wider suitable. 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 and dispersion-managed distributed amplifiers with different structures. These results show the flexibility of the proposed design algorithm. The comparison of OSNR between linked amplification units of SMF+DCF and DMF shows the potential application merit of DM-FRA.