Nonlinear dynamics of 1550 nm VCSELs subject to polarization-preserved optical feedback and orthogonal optical injection

Abstract

Based on spin-flip model (SFM), the nonlinear dynamics of 1550 nm vertical-cavity surface-emitting lasers (VCSELs) subject to polarization-preserved optical feedback (PPOF) and orthogonal optical injection (OOI) are theoretically investigated. The results show that two linear polarization (LP) modes can be simultaneously stimulated and polarization switching (PS) can be observed, which is different from the case that only y LP mode exists in a VCSEL with PPOF. Under the joint action of PPOF and OOI, the two LP modes will exhibit rich dynamical states, such as period one, period two, multi-period and chaos oscillation. Different evolution routes to chaos can be also observed. Moreover, frequency detuning Δf (Δf = f_m - f_s, where f_m and f_s are the center frequencies of free-running master VCSEL and slave VCSEL, respectively) has an obvious influence on the PS. With the increase of the positive frequency detuning PS points shift toward larger injection strengths; meanwhile, a suitable negative frequency detuning value makes the injection strength for PS be the lowest.

Keywords

vertical-cavity surface-emitting lasers (VCSELs) / nonlinear dynamics / orthogonal optical injection (OOI) / polarization-preserved optical feedback (PPOF)

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 60978003, 61078003, 61178011 and 61275116), the Natural Science Foundation of Chongqing City (No. 2012jjB40011).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg