Signal strength detection in high-speed optical electronics

Details Signal strength detection in high-speed optical electronics Signal strength detection in high-speed optical electronics

2005-02-15

2005-02-15

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C398S135000

Reexamination Certificate

active

06855920

ABSTRACT:
A fiber optic transceiver or receiver having circuitry for detecting signal strength of a photo-diode therein is disclosed. In one embodiment, the photo-current generated by the photo-diode is provided to a pre-amplifier circuit. The pre-amplifier circuit generates differential signals including a positive differential signal and a negative differential signal whose difference is representative of the detected photo-current. The fiber optic receiver further includes a post-amplifier circuit that is coupled to the pre-amplifier circuit to receive the differential signals. In one embodiment, the post-amplifier circuit includes circuitry to accurately derive a signal strength of the photo-current from the differential signals.

REFERENCES:
patent: 6674974 (2004-01-01), Stieger et al.
patent: 20010017724 (2001-08-01), Miyamoto et al.
patent: 20020048069 (2002-04-01), Ibukuro

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