Patent ID: 6014396
Filing Date: 2000-01-11
Classification: H01S

Abstract:
A semiconductor optoelectronic device comprising:a gain region having a region permitting propagation of light with a diverging phase front to a first aperture at a first end facet of the device;a single mode region coupled to an inner end of said gain region;said single mode region extending from the inner end to a second end facet of the device with a small diverging taper permitting propagation of light with a substantially adiabatic phase front to a second aperture at the second end facet so that the propagating light phase front at the second end facet is substantially the same as that at the inner end;the beam cross sectional profile at the second end facet of the single mode region being significantly smaller than the beam cross sectional profile at the first end facet of the gain region to limit the single mode region to supporting only single mode operation while reducing optical density of the propagating beam at the second end facet.