ANALYSIS OF VERTICAL CAVITY SERFACE EMITTING LASER, RESONANT CAVITY ENHANCED PHOTODETECTOR & THEIR INTEGRATED STRUCTURE

Optoelectronic integrated circuits (OEIC’s) are of a tremendous interest because of their high performance characteristics, small size, low cost & expected increased stability. For more efficient OEIC’s high performance photo-detectors & LASERs are required. Vertical cavity surface emitting LASERs are the choice for many optoelectronic applications due to their low threshold, single longitudinal mode operation & low beam divergence rather than traditional EELs. As VCSELs have monolithic structure they can be integrated with photo-detectors for to lend themselves in a number of new applications. VCSELs have fabry-perot cavity which has been realized by the distributed bragg reflectors placed on both sides of the cavity region. The resonator structure of VCSEL has made it possible to be with one of the high-speed photo-detector; Resonant Cavity Enhanced Photo-detector, briefly known as RCE-PD. In this photo-detector both high BW & high external quantum efficiency can be achieved simultaneously because of the multi-paths of the incident light due to the presence of the fabry-perot cavity into which the PD is inserted. In this paper the structure, materials requirement & characteristics of the integrated structure of VCSEL & RCE-PD are analyzed. As both of the LASERs & PDs have nearly same structure, there is a good practice to integrate the two structures to increase quantum efficiency to get more bandwidth efficient product. This analysis includes the observation of the quantum efficiency with FWHM, with incident angle & wit