Apparatus for measuring optical power in an optical receiver wit

Details Apparatus for measuring optical power in an optical receiver wit Apparatus for measuring optical power in an optical receiver wit

1993-01-28

1994-02-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 330110, 307492, H01J 4014

Patent

active

052869695

ABSTRACT:
An optical power monitoring circuit in an optical data receiver. A transconductance amplifier with non-linear feedback converts averaged photodiode current into a voltage representing a logarithm of the received optical power, which may be converted into decibels referenced to a standard power (dBm). The circuit has wide dynamic range and uses matched devices to provide processing and temperature compensation.

REFERENCES:
patent: 3584232 (1971-06-01), Wallace, Jr.
patent: 3992622 (1976-11-01), Numata et al.
patent: 4009385 (1977-02-01), Sell
patent: 5132829 (1992-07-01), Tzeng

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