Simulation of mode lock lasers using microring resonators integrated with InGaAsP saturable absorbers

Abstract

Add-drop microring resonators (MRRs) are used in a wide variety of practical applications. To add or drop special wavelength division multiplexing, an optical wavelength selective ring resonator can be used. This paper presents a system of multiple mode lock lasers consisting of an add-drop MRR integrated into a smaller ring with a saturable absorber (SA). In the case of mode-locking, a semiconductor is presented as the SA. This study uses an InGaAsP/InP semiconductor with an InP substrate and a direct bandgap as the MRR. The time-domain traveling wave method is utilized to model the presented photonic circuits. The generated multi-wavelength mode lock lasers have a bandwidth and free spectral range (FSR) of 1.1 and 30.24 nm, corresponding to 0.137 and 3.77 THz, respectively. The drop port output signals have a bandwidth and FSR of 1.5 and 30.24 nm, corresponding to 0.187 and 3.77 THz in the frequency domain. A finesse of 20.16 is obtained, and the Q-factor is ~1 × 103. The side bands of the mode lock lasers have an FSR of 0.86 nm.