Abstract

The effect of periodic phase modulation of light on a chaotic external-cavity semiconductor laser working in a regime of low-frequency fluctuations (LFFs) is studied numerically. It is observed that the phase modulation changes the time period between consecutive dropouts in the emitted laser intensity. A new variable ${\Phi }_L$ is defined as the phase of the laser’s LFFs, which increases in time with $2\pi$ after each power dropout event. The phase ${\Phi }_{\mathrm{PM}}$ of the periodic phase modulator is unfolded on the real axis and increases linearly at a rate given by the modulating frequency. It is shown that the phase difference between the laser and the modulator $\Delta \Phi \left(t\right)=m{\Phi }_L\left(t\right)-n{\Phi }_{\mathrm{PM}}\left(t\right)$, where m and n are integers, remains constant in time, leading to phase-synchronized states, for specific values of the modulating frequency and amplitude.

© 2006 Optical Society of America

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