28 February 2006 Semiconductor lasers subject to polarization-rotated optical feedback
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Abstract
The dynamics of a semiconductor laser subject to polarization rotated (incoherent) optical feedback have been numerical and experimental investigated. The results show that the induced dynamics can be grouped into four regimes (stable, chaotic, pulsed and two-state) and they also show that the TM mode of the laser never lases, at least in the ring cavity configuration studied. In addition, unlike the earlier short cavity work, the boundaries between the regimes in the long cavity case were found to be independent of the external cavity delay time. By focussing on the effects induced by incoherent optical feedback from long external cavities we will show that four regimes of operation can be accessed by varying the external reflectivity. Calculated Lyapunov exponents and a bifurcation diagram clearly delineate these regimes and experimental verification of the transition from stable to chaotic dynamics will be described. The dynamical behaviour exhibited in each regime will be explained in terms of the memory effect introduced by the time delay associated with the external cavity and the natural relaxation oscillations of the solitary laser. It will also be shown that within the pulsed regime the pulse repetition rate is determined by the external reflectivity and injection current and is independent of the external cavity length.
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R. Ju, R. Ju, Y. Hong, Y. Hong, Paul S. Spencer, Paul S. Spencer, } "Semiconductor lasers subject to polarization-rotated optical feedback", Proc. SPIE 6115, Physics and Simulation of Optoelectronic Devices XIV, 61150K (28 February 2006); doi: 10.1117/12.637473; https://doi.org/10.1117/12.637473
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