Patent ID: 7539228
Filing Date: 2009-05-26
Classification: H01L,H01S

Abstract:
1. An electroabsorption modulator distributed feedback laser (EML) assembly comprising an electroabsorption modulator (EAM) portion integrated with a distributed feedback laser (DFB) portion, the EML assembly comprising: a substrate having a lower surface and an upper surface; one or more layers including a buffer layer, one of said one or more layers having a lower surface that is in contact with the upper surface of the substrate; one or more layers including a multi quantum well (MQW) layer, one of said one or more layers that include the MQW layer having a lower surface that is in contact with an upper surface of an uppermost layer of said one or more layers that include the buffer layer; one or more layers including a grating layer, one of said one or more layers that include the grating layer having a lower surface that is in contact with an upper surface of one of said one or more layers that include the MQW layer, the grating layer having a diffractive grating defined in at least a portion of the grating layer; one or more cladding and contact layers, one of said one or more cladding and contact layers having a lower surface that is in contact with an upper surface of an uppermost layer of said one or more layers that include the grating layer; a ridge structure made of one or more cladding and contact layers that is grown on an upper surface of an uppermost layer of said one or more layers that include the grating layer, wherein the ridge structure is grown using a Selective Area Growth (SAG) technique; and an inter-contact electrical isolation region disposed between the EAM and DFB portions to electrically isolate the EAM and DFB portions from each other.