Advanced Computing and Simulation Laboratory, Monash University, Clayton, Victoria 3800, Australia.
Opt Lett. 2010 Sep 15;35(18):3138-40. doi: 10.1364/OL.35.003138.
We present a general study of pulse amplification in silicon Raman amplifiers, with special emphasis on the effects of spectral compression and group delay due to the Raman gain dispersion. We use the undepleted-pump approximation to analytically calculate the dynamics of an arbitrary pulse spectra and find the temporal profile of the pulse at the amplifier's output. We show that cw-pumped silicon waveguides are extremely inefficient in amplification of subpicosecond optical pulses but provide large net gains and controllable group delays for pulses with widths of ∼10 ps.
我们对硅喇曼放大器中的脉冲放大进行了全面研究，特别强调了喇曼增益色散引起的光谱压缩和群延迟效应。我们采用非耗散泵浦近似，对任意脉冲谱的动力学进行了分析计算，并得到了放大器输出端脉冲的时间分布。我们发现，对于亚皮秒光脉冲，连续波泵浦的硅波导的放大效率极低，但对于宽度约为 10 ps 的脉冲，却能提供大的净增益和可控制的群延迟。
