title: Wavelength conversion and parametric amplification of optical pulses via quasi-phase-matched four-wave mixing in long-period Bragg silicon waveguides.
abstract: 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.
authors: S
authors: S
authors: Lavdas
authors: S
authors: S
authors: Zhao
authors: J B
authors: JB
authors: Driscoll
authors: R R
authors: RR
authors: Grote
authors: R M
authors: RM
authors: Osgood
authors: N C
authors: NC
authors: Panoiu