Dual- and multiwavelength lasers, i.e., lasers with the ability to emit at two or more wavelengths in a controlled fashion, represent an exciting new twist in laser physics. Harnessing the mode competition to control them better remains, however, a challenge. In this work we numerically explore the effect of optical feedback on the emission properties of a dual-wavelength laser using a rate-equation model. We focus on switching capability and investigate the impact of key laser and feedback parameters. We connect the emergence of simultaneous emission to a lower cross saturation between modes and demonstrate that robust switching can be achieved using a short feedback cavity and a sufficiently strong feedback. In particular and in contrast to previous publications, we highlight that the feedback phase difference between the two modes is not a critical parameter. Our results are consistent with recent experimental observations, supporting the relevance of feedback-based control techniques for multiwavelength lasers.

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• Laser dynamics
• Semiconductor lasers
• Tunable lasers
• Laser techniques