Patent ID: 6894267
Filing Date: 2005-05-17
Classification: H01L

Abstract:
1. A photodetector device comprising: a structure in which a plurality of photodetector element units are stacked, wherein each of said photodetector element units is formed by sequential lamination of a first blocking layer of a first conductivity type semiconductor, a light-absorbing layer of an intrinsic semiconductor, and a second blocking layer of a second conductivity type semiconductor, on a substrate, wherein a first modulated signal light incident on the photodetector device is absorbed by each of said light-absorbing layers and converted into an electric signal provided as an output of the photodetector device, and wherein the photodetector device is of an end surface incidence type, in which said first modulated signal light is incident upon an end surface of each of the light-absorbing layers of said photodetector element units, and the light-absorbing layers in said photodetector element units have substantially identical thicknesses.