In this paper, we propose and numerically investigate a novel method to generate optical frequency comb (OFC) based on mutual injection in a twin-stripe semiconductor laser (a cell array integrating two lasers on one chip in parallel). Because of the existence of optical confinement factors and the small waveguide spacing, considerable lateral coupling or mutual injection occurs between the two paralleling neighbors. The twin-stripe semiconductor laser will be driven into complex nonlinear dynamic states and can be employed to generate OFCs. The proposed mutual-injection-induced OFC generation method does not need any external microwave sources or modulators. Moreover, the compact OFC generator is free of any auxiliary optical passive devices required in the typical master-slave injection configuration. The numerical results show that the mutual-injection-induced OFC can be flexibly adjusted by changing the bias currents and the mutual injection parameters.
In this paper, we propose and numerically investigate a novel scheme to optically generate microwave signal based on mutual injection locking. A twin-stripe semiconductor laser is driven into mutual injection locking state with two phase-locked wavelengths. Microwave signals with low phase noise are achieved. The frequency of the demonstrated microwave signals can be tuned by adjusting detuning frequency between the twin lasers. The results show that our proposed scheme is featured with not only lower phase noise but also better noise tolerance compared with typical master-slave injection configuration.
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