Patent ID: 8659038
Filing Date: 2014-02-25
Classification: H01S

Abstract:
1. A method of fabricating a superluminescent diode or semiconductor optical amplifier structure comprising: providing a GaAs substrate; forming a lower cladding layer above the substrate, the lower cladding layer comprising an Al forming an active region above the lower cladding layer, the active region comprising a GaAs separate confinement heterostructure; forming a stripe and an upper cladding layer comprising an Al wherein the stripe has at least one free end, each free end of the stripe being spaced apart from an edge of the substrate in a direction parallel to a longitudinal axis of the stripe such that a portion of the lower cladding layer, active region, current blocking layer and upper cladding layer extend beyond the at least one free end of the stripe in the direction parallel to the longitudinal axis of the stripe thereby to provide an unpumped and laterally unguided window region.