This paper gives analytical treatment and experimental details on on/off-bistability in vertical-cavity surface-emitting
lasers with frequency-selective feedback by a grating. In particular, the conditions for the coexistence
of lasing and nonlasing states and an abrupt turn-on behaviour at threshold are derived using an envelope
approximation. The theoretical and experimental results are in satisfactory agreement.
Dynamics of a semiconductor laser coupled to a fiber Bragg grating is analyzed thanks to a map, which indicates the existence of low frequency fluctuations when the reflectivity and the bandwidth of the Bragg grating are varied. The influence of these parameters is detailed and we show how the filter can be used to control the laser dynamics.
Stationary characteristics and relative intensity noise are simulated for a laser diode with strong filtered optical feedback from an external Bragg reflector. Multiple reflections in external cavity are taken into account through the introduction of Green functions. An analysis of the stationary solutions shows the appearance of new solutions for strong feedback and collapse in the plane frequency-gain of the ellipse which usually contains the modes and so-called antimodes. Numerical result are compared with analytical expressions.
We find three types of complex polarization dynamics arising in VCSELs with polarized optical feedback when axes of the intrinsic and external anisotropies are aligned. Their appearance depends on the interplay between these anisotropies which determines the stability of modes polarized along the polarizer axis with respect to perturbations with the same and orthogonal polarization. The influence on the laser behavior of a rotation of the external polarizer is considered.
The anisotropy and time-delayed nature of external feedback modify polarization switching thresholds and dynamical phenomena which are studied analytically and numerically for sensitivity to misalignment of the axes of intrinsic and external anisotropies.
In this paper the possibility of controlling steady states in a model of an external cavity laser diode with optimized impulsive delayed feedback is demonstrated. An examination is made of the application of such feedback via modulation of the laser drive current. Account is taken of practical constraints arising from technical delay and the frequency in application of the control signal. It is demonstrated that control of both unstable periodic orbits and steady states is achievable in the fully developed coherence collapse regime with or without preliminary targeting.
We have analyzed theoretically different chaos control schemes for a modulated class-B laser including discontinuous and continuous delayed feedbacks. The analysis is based on the detailed analytical and numerical studies of unstable manifolds evolution in phase space. A prescription for optimal control is proposed.
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