Measurement of the Nonlinear Loss and Effective Free Carrier Lifetime in Silicon Microring Resonators

• DOI: 10.1109/jlt.2024.3354105
• Publication Date: 2024-01-15T21:17:11Z
• Authors: Karan Mehta; Ranjeet Kumar; Mehbuba Tanzid; David Gold; Haisheng Rong; Richard Jones
• Keywords: Free carrier absorption; Transmission coefficient; Waveguide; Two-Photon Absorption

A methodology is presented to characterize the nonlinear absorption loss coefficient and effective free carrier lifetime in silicon ring resonators at high intra-ring optical power density. The proposed uses a continuous-wave pump-probe measurement capture distortion-free transmission spectra regime of absorption. measured using this method 30-40% higher than that obtained with single high-power laser. also reveals sharply increases beyond ∼11.6 mW bus waveguide for design highest quality-factor, most likely due saturation trap states by electrons holes generated two-photon