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Mindaugas Radziunas

As seen in: Optica
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Articles

Low-frequency fluctuations in semiconductor lasers with delayed optical feedback

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By Deborah Kane, Mindaugas Radziunas
| Optica Verified
Low-frequency fluctuations in a semiconductor laser with optical feedback are analyzed with a traveling wave model and its instantaneous and compound-cavity modes. Compound-cavity mode curves, their height and width in the frequency/carrier-density plane, enable fast estimates of parameter ranges where low-frequency fluctuations occur. These ranges cover a larger part of the parameter space than is commonly realized. © 2026 Optica Publishing Group.
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Numerical study of optical feedback coherence in semiconductor laser dynamics

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By Deborah Kane, Douglas Little, Mindaugas Radziunas
| osapublishing.org
Abstract The nonlinear dynamics of a semiconductor laser with coherent, as compared to incoherent, delayed optical feedback systems have been discussed and contrasted in prior research literature. Here, we report simulations of how the dynamics change as the coherence of the optical feedback is systematically varied from being coherent, through several levels of partial coherence, to incoherent. An increasing rate of phase disturbance is used to vary the coherence.
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