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Dynamic characteristics in an external-cavity multi-quantum-well laser

Chinese Physics B 2018年第6期27卷 185-194页

作者： Sen-Lin Yan Department of Electronic Engineering Nanjing Xiaozhuang University Nanjing 211171 China

This paper outlines our studies of bifurcation, quasi-periodic road to chaos and other dynamic characteristics in an external-cavity multi-quantum-well laser with delay optical feedback. The bistable state of the laser is predicted by finding theoretically that the gain shifts abruptly between two values due to the feedback. We make a linear stability analysis of the dynamic behavior of the laser. We predict the stability scenario by using the characteristic equation while we make an approximate analysis of the stability of the equilibrium point and discuss the quantitative criteria of bifurcation. We deduce a formula for the relaxation oscillation frequency and prove theoretically that this formula function relates to the loss of carriers transferring between well regime and barrier regime, the feedback level, the delayed time and the other intrinsic parameters. We demonstrate the dynamic distribution and double relaxation oscillation frequency abruptly changing in periodic states and find the multi-frequency characteristic in a chaotic state. We illustrate a road to chaos from a stable state to quasi-periodic states by increasing the feedback level. The effects of the transfers of carriers and the escaping of carriers on dynamic behavior are analyzed, showing that they are contrary to each other via the bifurcation diagram. Also,we show another road to chaos after bifurcation through changing the linewidth enhancement factor, the photon loss rate and the transfer rate of carriers.

关键词： bifurcation chaos multi-quantum-well laser optical feedback

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Theory of Dynamics In-Phase Locking and Quasi-Period Synchronization in Two Mutually Coupled multi-quantum-well lasers

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Communications in Theoretical Physics 2011年第3期55卷 481-488页

作者： YAN Sen-Lin Department of Physics and Electronic Engineering Nanjing Xiaozhuang University Nanjing 211171 China

Abstract We study dynamics in two mutually coupling multi-quantum-well lasers. We carry out theoretical and numerical analysis of synchronization, anti-synchronization, in-phase locking in the two identical lasers but detuning, in detain. It is proved that the coupling level determines stability of the lasers by analyzing the eigenvalue equation. Critical case of locking is discussed via the phase difference equation. Quasi-period and stable states in the two lasers are investigated via varying the current, detuning and coupling level.

关键词： in-phase locking synchronization multi-quantum-well laser coupling

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