15 May 2012 Nonlinear dynamics in directly modulated semiconductor ring lasers
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In this paper, we have theoretically studied the dynamical behavior of current modulated semiconductor ring lasers (SRLs). As we vary the amplitude and frequency of the modulation around a fixed bias current, difference dynamical states including periodic, quasi-periodic and chaotic states are found. As in other single mode semiconductor lasers, the modal intensities in an SRL present chaotic behavior for driving frequencies comparable to the relaxation oscillation frequency. In this regime the two counter-propagating modes vary in phase. However, for modulation frequencies significantly lower than the relaxation oscillation frequency, we reveal the existence of chaotic oscillations where the two counter-propagating modes are in anti-phase.
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S. Takougang Kingni, G. Van der Sande, L. Gelens, J. Danckaert, "Nonlinear dynamics in directly modulated semiconductor ring lasers", Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84321Q (15 May 2012); doi: 10.1117/12.921949; https://doi.org/10.1117/12.921949

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