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We study the dynamics of a class-B semiconductor microring laser coupled to aneutral microring resonator for common fabrication parameters. For zerodetuning between the resonators, we identify five dynamical regions controlledby the normalized pump rate of the laser and coupling strength between theresonators. These regions show stable lasing with phase locking for eithersufficiently small or large coupling strength parameter values. Multistabilityand chaos arise in between these stable regions where at least one fixed pointis attractive. The transition from stable to unstable lasing regions in theparameter space phase diagram is a crossover.

Routes to chaos in a class-B laser coupled to a neutral resonator