宽带光纤拉曼放大器的优化设计

Studies on Optimal Design for Wide-band Fiber Raman Amplifier

研究优化设计宽带光纤拉曼放大器平坦增益带宽的方法。通过研究多波长后向泵浦光纤拉曼放大器的传输方程,分别用模拟煺火算法及四阶阿当方法迭代出各泵浦波频率及输入功率的大小。可设计出满足增益平坦度要求的宽带光纤拉曼放大器。设计了两个光纤拉曼放大器,一个采用双波长泵浦,得到的平坦增益带宽为50nm,增益不平坦度小于1dB。另一个采用四波长泵浦,得到的平坦增益带宽为80nm,增益不平坦度小于1dB。所得结果证明提出的优化设计方法对于设计多波长泵浦平坦增益带宽光纤拉曼放大器是一种有效的方法。

The optimal design method for flat-gain wide-band fiber Raman amplifiers is presented in this paper. The propagation equations of fiber Raman amplifier with multiple wavelength back-pumps are solved by making use of simulated annealing algorithm and 4-step Adams-Bashforth method to obtain frequencies and input powers of every pump. Then a flat-gain wide-band fiber Raman amplifier is worked out. Two fiber Raman amplifiers are designed on using two pumps and the other four pumps. The relative gain flatnesses are all less than 1dB within the bandwidths of more than 50 nm and 80nm,respectively. The calculation results verify that the proposed method is practicable to design flat-gain wide-band fiber Raman amplifier.