Circuit for measuring photo-current level in fiber optic links

Details Circuit for measuring photo-current level in fiber optic links Circuit for measuring photo-current level in fiber optic links

2006-05-02

2006-05-02

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

Reexamination Certificate

active

07038187

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 first signal and a second 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: 5237526 (1993-08-01), Delagrange

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