Abstract
We explore the effects of nonlinear mechanisms, i.e., carrier density pulsation, carrier heating, and spectral hole burning on mode multistability in microring lasers (MRLs) both theoretically and numerically. Expressions for achieving mode multistable operation are derived and analyzed. We find that nonlinear mechanisms play an important role in mode multistability. We verify the theoretical results by numerical simulations, and find that spectral hole burning is more effective than carrier density pulsation and carrier heating in increasing the number of multistable modes in MRLs. The results also show that a decrease in the ring radius will result in a reduction in the number of multistable modes.
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