High repetition rate flat coherent optical frequency comb generation based on the normal dispersion tantalum pentoxide optical waveguide

Abstract

In this paper, high repetition rate flat coherent optical frequency comb generation based on the normal dispersion tantalum pentoxide (Ta2O5) optical waveguide is proposed and numerically investigated. The 1.2 meters long normal dispersion Ta2O5 integrated nonlinear waveguide through dispersion engineering is used to generate a flat optical frequency comb of about 50 nm span based on self-phase modulation and optical wave breaking near 1550 nm. The time-spectrum evolution during the pulse propagation process is analyzed by the X-Frog technique. The effects of various parameters on the broadening comb spectra bandwidth and flatness are considered, and the spectral coherence of the optical frequency comb is also studied. The simulation results show that the Ta2O5 integrated nonlinear waveguide has a great prospect in broadband high repetition rate flat coherent optical frequency comb generation.