100-GHZ RESONANT-CAVITY ENHANCED SCHOTTKY PHOTODIODES

Resonant cavity enhanced (RCE) photodiodes are promising candidates fo r applications in optical communications and interconnects where ultra fast high-efficiency detection is desirable. We have designed and fabr icated RCE Schottky photodiodes in the (Al, In) GaAs material system f or 900-nm wavelength. The observed temporal response with 10-ps pulsew idth was limited by the measurement setup and a conservative estimatio n of the bandwidth corresponds to more than 100 GHz. A direct comparis on of RCE versus conventional detector performance was performed by hi gh speed measurements under optical excitation at resonant wavelength (895 nm) and at 840 nm where the device functions as a single-pass con ventional photodiode. A more than two-fold bandwidth enhancement with the RCE detection scheme was demonstrated.