Direct modulated modified vertical cavity surface emitting lasers

A laser system having separately electrically operable cavities for emitting modulated narrow linewidth light, said system comprising:na 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, anda 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.