Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-07-12
2005-07-12
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C257S432000, C257S446000, C257S499000, C385S049000, C385S051000
Reexamination Certificate
active
06917032
ABSTRACT:
A semiconductor photodetection device includes a light incident facet for receiving light from an optical waveguide. Light received at the light incident facet is refracted through a photo-absorption layer to register photonic events. A material may be introduced between the optical waveguide and the light incident facet to improve responsiveness of the device. The light incident facet may be at an angle to the direction of the light emitted from the optical waveguide to cause the incident light to be refracted through several layers of the semiconductor photodetection device.
REFERENCES:
patent: 4784452 (1988-11-01), Hodge et al.
patent: 6770945 (2004-08-01), Fukano
Ellis Suezu
Nippon Telegraph and Telephone Corporation
Ostrolenk Faber Gerb & Soffen, LLP
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