Using spin-flip model (SFM) of vertical-cavity surface-emitting lasers (VCSELs) subject to polarized injection, it is found that reducing the spin relaxation, or increasing the birefringence and pumping terms, can increase elliptically polarized injection locking (EPIL) stability for the slave VCSEL. The nonlinear dynamic is investigated in optically injected VCSELs with numerical simulation techniques for six fundamental VCSEL rate equations. A novel phenomenon as quasi stability which affects the EPIL is analyzed.
The aim of this paper is to use the spin-flip model (SFM) to investigate how the fundamental parameters of birefringence, spin relaxation and pumping affect the dynamics of solitary and optically-injected vertical-cavity surface-emitting lasers (VCSELs). The SFM predicts that a solitary VCSEL can exhibit diverse polarisation behaviour, including elliptical and linear stability, which can be used in polarisation switching. For given values of pumping, spin relaxation and birefringence, we analyse the electric field components, the carrier densities corresponding to spin-up and spin-down, and the relaxation oscillation frequency for a solitary VCSEL and the stability map for an optically-injected VCSEL.
The spin flip model (SFM) is extended to analyse the behaviour of vertical-cavity surface-emitting lasers (VCSEL) subject to optical injection with linear polarization. The effect of birefringence and spin relaxation rate on the stable locking region in the plane of injected optical power versus frequency detuning is investigated. It is found that increased birefringence or reduced spin relaxation rate cause the stable locking region to begin at higher injected power and detuning. Regions of quasi-stability are also identified for certain combinations of parameters, characterised by sinusoidal oscillations of very small amplitude in the optical field components.
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