Patent ID: 6278134
Filing Date: 2001-08-21
Classification: B82Y,H01L,H01S

Abstract:
A cascade semiconductor light source comprisinga first active region including alternating undoped barrier and undoped quantum well layers;a second active region including alternating undoped barrier and undoped quantum well layers; andan injector region disposed between the first and second active regions, said injector region comprising alternating doped barrier layers and doped quantum well layers and defined as including a center point, the application of a first polarity voltage to said light source results in the first active region to be positively biased with respect to the injector region such that the cascade semiconductor light source exhibits a first, predetermined characteristic and the application of a second, opposite polarity voltage to said light source results in the second active region to be positively biased with respect to the injector region such that the cascade light source exhibits a second, predetermined characteristic.