【摘要】 对拉曼散射的耦合方程进行推导,得到不同泵浦光对拉曼增益贡献的表达式,改进了波长和功率两步优化的遗传算法.对波长的优化不考虑信号光之间的泵浦作用,大大减少了优化参数,对功率的优化则把忽略的信号光之间的泵浦作用考虑进去.构造了体现特定高增益和宽带平坦的适应度函数.分析了遗传算法的种群大小和选择方式.最后优化得到了使用8个泵浦波长,增益波动小于1dB的高增益(20dB)宽带(80nm)拉曼放大器.更多还原

【Abstract】 The gain expression of a Raman amplifier pumped with multiple Laser diodes(LDs)was derived from the coupled equations for the Raman scattering.To accelerate optimization of the wavelengths and powers of the pumping LDs,a genetic algorithm was applied in two steps.When optimizing the wave-lengths of the pumping LDs,interaction between the signals were ignored;but the interaction between the signals was considered when optimizing the powers of the pumping lights.The appropriate choice of the fitness for the high and flat gain in a broad band was discussed.As an example,a Raman amplifier with flat(<1dB)and high gain(20dB)in a broad band(80nm)was designed.更多还原