Guo Xiaojie, Fu Xuelei, Shu Chester
Opt Lett. 2014 Jun 15;39(12):3658-61. doi: 10.1364/OL.39.003658.
We investigate the gain spectral characteristics in the course of saturation in a Raman-assisted fiber optical parametric amplifier (FOPA). It is experimentally observed that the saturated gain spectrum is modified with suppressed signal wavelength dependence as compared to a conventional FOPA. The gain at signal wavelengths on both farther and closer sides of the unsaturated gain peak from the pump saturates in a similar way. The modification of the saturated gain spectrum is explained by distributed nonlinear phase mismatch caused by the Raman effect.
我们研究了拉曼辅助光纤光学参量放大器（FOPA）饱和过程中的增益光谱特性。实验观察到，与传统FOPA相比，饱和增益光谱发生了变化，信号波长依赖性受到抑制。在远离和靠近泵浦非饱和增益峰值的信号波长处的增益，其饱和方式相似。饱和增益光谱的这种变化是由拉曼效应引起的分布式非线性相位失配所解释的。
