Patent ID: 6104739
Filing Date: 2000-08-15
Classification: H01S

Abstract:
A series of semiconductor lasers having an output facet, comprising:a plurality of complex coupled distributed feedback semiconductor lasers having laser cavities arranged in a series coaxially along same optical axis, each laser comprising:(a) substrate;(b) an active region formed on the substrate and comprising a multiple quantum well structure;(c) an excitation means for pumping the active region;(d) a complex coupled grating having corrugations along the optical axis formed by periodic etching grooves through the active region, the grating having a period comprising a first section and a second section, wherein substantially all quantum wells are removed away from the second section so as to provide no substantial photon emission in the second section resulting in gain coupling and index coupling of the laser of such a magnitude that ensures no substantial interaction between lasers in the series, stable generation of light in the presence of other lasers in the series and provides the required stopband of the laser;a Bragg wavelength of each laser in the series being outside the stop bands of all other lasers which are closer to the output facet of the series.