Patent ID: 7759672

Claim:
A semiconductor device comprising: at least three layers of semiconductor material disposed on a substrate material, the semiconductor material having a formula Al 1−x−z Ga x In z As 1−y Sb y with 0<x<1, 0<y<1, 0<z≦1 and 0<x+z<1, with at least one layer where 0<z<1 and 0<x+z<1, wherein at least some of the semiconductor layers comprise two cladding layers around a core of one or more layers, said cladding layers consisting essentially of Al 1−x−z Ga x In z As 1−y Sb y with 0<x<0.6, 0<y<1, 0≦z<0.5 and 0<x+z<0.6, the device further comprising: a) an etched structure in the semiconductor material for defining an optical waveguide and/or electrical connection through the device; b) an electrical insulating layer or parts for insulating parts of the device and/or to define contacts and/or conduction wires in or on the device; and c) a metal layer or parts for defining contacts and/or conduction wires in or on the device.