Lavdas S, Zhao S, Driscoll J B, Grote R R, Osgood R M, Panoiu N C
Opt Lett. 2014 Jul 1;39(13):4017-20. doi: 10.1364/OL.39.004017.
We present a theoretical analysis supported by comprehensive numerical simulations of quasi-phase-matched four-wave mixing (FWM) of ultrashort optical pulses that propagate in weakly width-modulated silicon photonic nanowire gratings. Our study reveals that, by properly designing the optical waveguide such that the interacting pulses copropagate with the same group velocity, a conversion efficiency enhancement of more than 15 dB, as compared to a uniform waveguide, can readily be achieved. We also analyze the dependence of the conversion efficiency and FWM gain on the pulse width, time delay, walk-off parameter, and grating modulation depth.
我们给出了一个理论分析，该分析得到了超短光脉冲在弱宽度调制硅光子纳米线光栅中传播的准相位匹配四波混频（FWM）的全面数值模拟的支持。我们的研究表明，通过适当地设计光波导，使相互作用的脉冲以相同的群速度共传播，与均匀波导相比，可以很容易地实现超过15 dB的转换效率增强。我们还分析了转换效率和FWM增益对脉冲宽度、时间延迟、走离参数和光栅调制深度的依赖性。
