Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-12-01
1991-03-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
455619, H01J 4014
Patent
active
049980122
ABSTRACT:
A transimpedance receiver for broad band optical signals, such as carry multichannel CATV signals or broad band data over an optical fiber which may vary in length (e.g. from 2 km to 20 km) such that the optical power at a photodetector of the receiver may vary widely depending upon where the receiver, and is installed in the fiber optic distribution system utilizes a broad band device, preferably a GASFET, the internal capacitance and gain of which enables amplification over the broad band frequency range without oscillation. Different values of transimpedance for converting the current signal from the photodetector into an output voltage at the output (the drain) of the device which is in a range within which the device is linear, and does not introduce distortion into the signal, is obtained by connecting, between the output and the input of the device, a feedback resistor selected from a group consisting of resistors of different value each dependent upon the optical power of the optical signal applied to the photodetector. The output voltage is coupled to an electrical transmission line which may be a low impedance coaxial line using a buffer amplifier incorporating a device of the same type as used in the transimpedance amplifier which has connected thereto networks for controlling the spectral response of the receiver so that it remains essentially flat over the broad band frequency range.
REFERENCES:
patent: 4620321 (1986-10-01), Chown
patent: 4641378 (1987-02-01), McConnell et al.
patent: 4750217 (1988-06-01), Smith et al.
patent: 4771325 (1988-09-01), Cheng
patent: 4855687 (1989-08-01), Hebert
patent: 4857725 (1989-08-01), Goodnough
Le Que T.
Lukacher Martin
Nelms David C.
Scientific - Atlanta, Inc.
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