Optical detector and method for detecting incident light

Details Optical detector and method for detecting incident light Optical detector and method for detecting incident light

2005-07-19

2005-07-19

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100, C257S435000

Reexamination Certificate

active

06919552

ABSTRACT:
An optical detector and method for detecting incident light utilizes a pair of photosensitive devices in which one of the photosensitive devices is selectively exposed to the incident light to generate differential current signals that can be used to measure the intensity of the incident light. The photosensitive devices may be phototransistors having a silicon-germanium (SiGe) absorption region that is able to convert longer wavelength light, such as 980 nm or 1300 nm light, into current. The SiGe phototransistors may be fabricated on a silicon substrate.

REFERENCES:
patent: 3304431 (1967-02-01), Biard et al.
patent: 4916307 (1990-04-01), Nishibe et al.
patent: 5818322 (1998-10-01), Tasumi
patent: 6075253 (2000-06-01), Sugiyama et al.
patent: 6552362 (2003-04-01), Ohtani et al.

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