主要研究了基于光子晶体光纤的宽带分立式拉曼放大器的优化设计方法。简化了多波长抽运宽带光纤拉曼放大器的传输方程, 得到优化设计的模型及目标函数。对传统的优化算法进行了改进, 提出了一种新的遗传模拟退火算法, 该算法同时利用遗传算法和模拟退火算法的优点。设计了两个分立式光纤拉曼放大器, 一个采用双波长抽运, 另一个采用四波长抽运。仿真结果表明, 光子晶体光纤可以用来设计成为短长度、高效的分立式光纤拉曼放大器。

The optical design method for the wide-band fiber Raman amplifier（FRA） based on photonic crystal fiber（PCF） is presented in this paper. Power coupled equations for a multi-wavelength broadband Raman amplifier are reasonably simplified, so a simple object function is proposed. Meanwhile a new algorithm called genetic and simulated annealing algorithm is proposed through improving on the conventional algorithm, which is more advantageous than using the genetic algorithm or simulated annealing algorithm respectively. Two FRAs are designed using two pumps and four pumps in this paper. The simulative results verify that PCF is perfect choice of a small-sized and efficient discrete FRA.