Photodetector to detect a light in different wavelength regions

Details Photodetector to detect a light in different wavelength regions Photodetector to detect a light in different wavelength regions

1989-09-21

1991-07-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022723, 350 9611, 350 9614, G01J 350

Patent

active

050327100

ABSTRACT:
A photodetector comprises a waveguide layer to propagate lights, a clad layer which is laminated onto the waveguide layer and has a refractive index smaller than that of the waveguide layer, the clad layer having at least two portions having different thicknesses, and photoelectric converting devices which are respectively provided on the surfaces of the different thickness portions of the clad layer on the side opposite to the side which faces the waveguide layer.

REFERENCES:
patent: 4279464 (1981-07-01), Colombini
patent: 4372641 (1983-02-01), Johnson et al.
patent: 4778987 (1988-10-01), Saaski et al.

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