Abstract
Vertical-cavity surface-emitting lasers (VCSELs) can support a number of transverse optical modes. Under an external influence, such as optical feedback, these modes may interact, resulting in complex dynamics. We investigate a VCSEL model in which the first two, rotationally symmetric, linearly polarised optical modes (LPoi and LP02) are excited. A general form of optical feedback is studied, in which the electric fields of the two modes can couple via the external-cavity round-trip. This is in contrast to previous studies in which each field receives feedback only from itself. More specifically, we study the external-cavity mode (ECM) structure of a VCSEL with a small amount of feedback induced cross-coupling between the electric fields. The ECMs underpin the more complicated dynamics and, as such, a detailed analysis of their dependence on parameters is needed to fully understand a VCSEL subject to optical feedback.
© 2007 IEEE
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