Patent ID: 6628691
Filing Date: 2003-09-30
Classification: B82Y,H01S

Abstract:
A laser diode comprising:a substrate having a first conductive type; a first cladding layer having a first conductive type and formed on said substrate; an active layer including a plurality of quantum dots and formed on said first cladding layer; a diffraction grating having a Bragg wavelength of &lgr;g and formed on said active layer; a second cladding layer having a second conductive type and formed on said active layer; a first electrode for injecting carriers having a first polarity into said active layer via said substrate; and a second electrode for injecting carriers having a second polarity into said active layer via said second cladding layer, wherein said diffraction grating has a pitch satisfying the following equation: &Dgr;E&lE;1.1&Ggr;â€ƒwhere &Ggr; is the full width at half maximum (FWHM) of the gain spectrum of said active layer and &Dgr;E an amount of an energy width corresponding to said Bragg wavelength &lgr;g from the center wavelength energy of said gain spectrum.