Patent ID: 8355423
Filing Date: 2013-01-15
Classification: H01S

Abstract:
1. A vertical cavity surface emitting laser (VCSEL) comprising: a substrate, on which are disposed first and second distributed Bragg reflectors (DBRs), each DBR comprising a stack of layers of alternating refractive index; an active layer disposed between the DBRs; and an aperture layer disposed either between the DBRs or within one of the DBRs; wherein: the aperture layer is disposed within a mesa having an external periphery comprising a plurality of indentations; and the aperture layer comprises a border in the plane of the layer having an external boundary coincident with the periphery of the mesa and an internal boundary defining one or more apertures, the one or more apertures having a shape in general correspondence with the external boundary, the shape configured so as to allow one chosen higher order mode and suppress other higher order modes of a signal emitted by the VCSEL and thereby reduce the bandwidth of the signal.