title: Non-degenerate two-photon absorption in silicon waveguides: analytical and experimental study.
abstract: We theoretically and experimentally investigate the nonlinear evolution of two optical pulses in a silicon waveguide. We provide an analytic solution for the weak probe wave undergoing non-degenerate two-photon absorption (TPA) from the strong pump. At larger pump intensities, we employ a numerical solution to study the interplay between TPA and photo-generated free carriers. We develop a simple and powerful approach to extract and separate out the distinct loss contributions of TPA and free-carrier absorption from readily available experimental data. Our analysis accounts accurately for experimental results in silicon photonic crystal waveguides.
authors.forename: Yanbing
authors.initials: Y
authors.lastname: Zhang
authors.forename: Chad
authors.initials: C
authors.lastname: Husko
authors.forename: Simon
authors.initials: S
authors.lastname: Lefrancois
authors.forename: Isabella H
authors.initials: IH
authors.lastname: Rey
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Krauss
authors.forename: Jochen
authors.initials: J
authors.lastname: Schröder
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton