Patent ID: 11887999
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The photodetector according to claim 1,
wherein a photodiode of the first and second groups of photodiodes includes
a silicon substrate;
a lower clad layer formed on the silicon substrate;
a silicon core layer formed on the lower clad layer and including a silicon region doped with impurities having a first conductivity type;
a silicon waveguide layer connected to the silicon core layer;
a germanium layer formed on the silicon core layer and including a region doped with impurities having a second conductivity type;
an upper clad layer formed on the silicon core layer and the germanium layer; and
electrodes connected to the silicon region and the region of the germanium layer, respectively.