Patent ID: 7324574

Claim:
A long wavelength vertical cavity surface emitting laser configuration comprising: a semiconductor substrate; a photodetector located on said semiconductor; a lower distributed Bragg reflector, which includes multiple layers and is grown on the photodetector; an active region, which includes multiple semiconductor material layers which emit long wavelength light upon excitation and is grown on the lower distributed Bragg reflector; and an upper distributed Bragg reflector, which includes multiple layers and is grown on the active region, wherein the photodetector detects a laser beam emitted from the active region that heads toward semiconductor substrate, wherein both shoulders of the photodetector are exposed so that a stack including the lower distributed Bragg reflector, the active region, and the upper distributed Bragg reflector has a column shape on the photodetector, and wherein the photodetector comprises a PIN photodiode having a p-doped layer, an n-doped layer and an absorbing layer, and further comprising at least one upper photodiode formed on the upper distributed Bragg reflector, at least an intermediate electrode formed on the PIN electrode, and a lower electrode formed on a bottom surface of the semiconductor substrate, said lower electrode being shared by the active region and the PIN photodiode.