Patent ID: 7409134
Filing Date: 2008-08-05
Classification: B82Y,G02B,H01S

Abstract:
1. An optical waveguiding device for guiding therethrough light of a predetermined wavelength, the device formed of semiconductor material, the device comprising: a first cladding layer; a second cladding layer; and a waveguiding layer disposed between the first and second cladding layers and having a substantially higher refractive index than said first and second cladding layers; wherein at least one of the first and second cladding layers includes a beam control layer in which the refractive index of the semiconductor material gradually varies, as seen by light propagating through the device, as a function of depth through the layer, the beam control layer including a first sub-layer in which the refractive index varies gradually from a first level to a second level, and a second sub-layer contiguous with the first sub-layer in which the the refractive index varies gradually from said second level to a third level, the third level being substantially equal to the first level.