Patent ID: 9099840
Filing Date: 2015-08-04
Classification: H01S

Abstract:
1. A distributed feedback (DFB) laser, comprising: a substrate comprising a compound semiconductor material; at least one quantum-well (QW) active layer (active layer) overlying said substrate; a p-doped cladding layer comprising said compound semiconductor material on one side of said active layer; an n-doped cladding layer comprising said compound semiconductor material on another side of said active layer; a diffraction grating in said p-doped cladding layer or in said n-doped cladding layer configured to select an operating wavelength for said DFB laser, and a waveguide structure in said n-doped cladding layer including a waveguide layer comprising a first composition that is compositionally different from said compound semiconductor material, said waveguide layer having an optical thickness of 0.7 to 1.5 of said operating wavelength in said compound semiconductor material (guided wavelength).