Abstract

Mode characteristics are investigated numerically and experimentally for microring resonator lasers directly connected to an output waveguide. Optimized structural parameters are proposed for the microring resonators for realizing single-mode and unidirectional-emission operation. Finite-difference time-domain simulations indicate that the inner wall of the microring resonators introduces additional radiation loss and scattering loss, and so suppresses the higher-order transverse modes with higher field distributions in the internal region of the microrings. However, the mode Q factors can be enhanced several times for some modes with suitable inner-wall radii. AlGaInAs/InP microring lasers with inner-wall radii of 0, 5, and 7 μm and an outer-wall radius of 10 μm connected to a 2-μm-wide output waveguide are fabricated by planar techniques. Lasing spectra with longitudinal mode wavelength intervals of 11–12 nm and side-mode suppression ratios of 28–36 dB are observed, and suppression of higher-order transverse modes is achieved as the prediction of the simulation results.

© 2014 Optical Society of America

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