Patent ID: 6782025
Filing Date: 2004-08-24
Classification: G02F,H01Q,H01S

Abstract:
A semiconductor laser diode comprising:a body of a semiconductor material having a length of at least 2.5 millimeters; a waveguide region formed in the body; an active region within the waveguide for generating an optical mode of photons; a highly doped p-clad layer located on a first side of the waveguide region and formed in the body; a highly doped n-clad layer located on a second side of the waveguide region and formed in the body; and a ridge structure formed in the body, disposed on a side of the waveguide region, and covering a portion of the waveguide region, while leaving other portions of the waveguide region uncovered, wherein an effective refractive index of the ridge structure and portions of the body covered by the ridge structure differs from an effective refractive index of portions of the body adjacent to the ridge structure and adjacent to the portions of the body covered by the ridge structure by less than 0.002, and wherein the thickness of the waveguide region and the composition of the waveguide and clad regions is such that an overlapping of the optical mode generated in the waveguide region into the clad layers is not greater than about 5%.