Enhanced performance optical receiver having means for switching

Details Enhanced performance optical receiver having means for switching Enhanced performance optical receiver having means for switching

1992-03-24

1993-04-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

359189, H01J 4014

Patent

active

052025535

ABSTRACT:
A transimpedance front end is provided for an optical receiver which includes a photodetector coupled optically to an optical fiber for receiving optical signals over the fiber and connected electrically to the front end. The front end comprises a buffer amplifier connected to the photodetector, a first amplifier selectively connected to the buffer through a first switch and through a first, high value feedback resistor in order to define a first mode low optical signal level amplifier configuration, a second amplifier selectively connected to the buffer through a second switch and through a second, switched low value resistor to define a second mode high optical signal level amplifier configuration, and an optical level sensing and switching control circuit connected to the photodetector for sensing incoming optical signal level and for switching between the first and second amplifier configurations as a function thereof.

REFERENCES:
patent: 4792998 (1988-12-01), Toussaint
patent: 4805236 (1989-02-01), Urala
patent: 4808810 (1989-02-01), Van Doorn
patent: 4998012 (1991-03-01), Kruse
patent: 5012202 (1991-04-01), Taylor
patent: 5030925 (1991-07-01), Taylor
patent: 5138148 (1992-08-01), Sakura

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