Patent ID: 7965751

Claim:
A laser system having separately electrically operable cavities for emitting modulated narrow linewidth light, said system comprising: a compound semiconductor material substrate, at least two first mirror pairs of semiconductor material layers in a first mirror structure on said substrate of a first conductivity type, a first active region on said first mirror structure with plural quantum well structures, at least twenty second mirror pairs of semiconductor material layers in a second mirror structure on said first active region of a second conductivity type, a second active region on said second mirror structure with plural quantum well structures, at least two third mirror pairs of semiconductor material layers in a third mirror structure on said second active region of said first conductivity type, an intermediate electrical interconnection at said second mirror structure, and a pair of electrical interconnections separated by said substrate, said first mirror structure, said first active region, said second mirror structure, said second active region, and said third mirror structure.