Patent ID: 7564885

Claim:
An integrated electro-optical device comprising: a distributed feedback laser (DFL) structure; an electro-absorption modulator (EAM) structure integrated with the DEL structure, the EAM structure comprising: a substrate layer; one or more buffer layers disposed on an upper surface of the substrate layer; one or more multi quantum well (MOW) layers disposed on said one or more buffer layers; one or more other layers disposed on said one or more MOW layers, said one or more other layers including at least a cladding layer and a contact layer; a localized EAM island region having an upper portion, side portions, and a lower portion, the upper portion comprising an upper surface having a width dimension, the side portions of the island region extending between the upper and lower portions of the island region, the side and lower portions of the localized island region being laterally surrounded by said one or more MOW layers and by said one or more other layers, the island region including at least a semi-insulating material; and an EAM contact pad disposed on said one or more other layers, the contact pad having a width dimension, wherein said contact pad is positioned over the localized EAM island region such that said EAM contact pad is generally centered and aligned with the upper surface of the upper portion of the localized EAM island region in the width dimensions of the localized EAM island region and of the EAM contact pad; and an isolation region interposed between the DEL structure and the EAM structure.