title: Effects of multiphoton absorption on parametric comb generation in silicon microresonators.
abstract: We investigate theoretically the parametric frequency comb generation in silicon microresonators at telecom and mid-infrared (MIR) wavelengths in the presence of multiphoton absorption and free-carrier effects using a modified Lugiato-Lefever model. We show that parametric oscillation may occur at MIR wavelengths, provided that the free-carrier lifetime is sufficiently short or the optical pump power is sufficiently low, but is inhibited at telecom wavelengths. In addition, we propose an etchless, air-clad silicon microresonator that enables an octave-spanning frequency comb in a completely passive device.
authors.forename: Ryan K W
authors.initials: RK
authors.lastname: Lau
authors.forename: Michael R E
authors.initials: MR
authors.lastname: Lamont
authors.forename: Yoshitomo
authors.initials: Y
authors.lastname: Okawachi
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Gaeta