ULTRA-WIDE-BAND LONG-WAVELENGTH PHOTODETECTORS

Developments and performances of ultra-wide-band long-wavelength photo detectors are outlined. Theoretical consideration shows the competence of the waveguide p-i-n photodetector for ultra-wide-band long-wavelen gth optical fibre communication. A newly proposed multimode waveguide p-i-n photodetector with mushroom-mesa structure can relax the parasit ic limits, and reaches a record performance of 110 GHz bandwidth and 5 0% external quantum efficiency at a 1.55 mu m wavelength. A high-speed monolithically integrated photoreceiver using the waveguide p-i-n pho todetector is also presented.