Optical receiver

Details Optical receiver Optical receiver

1985-09-30

1987-07-07

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

250214A, 330 59, 330110, 330308, H04B 900

Patent

active

046792511

ABSTRACT:
In an optical receiver for the reception of a modulated light beam, the beam falls on a PIN diode connected to the input of an amplifier which has a feedback resistor across it. This resistor is shunted by the series combination of a Schottky diode and of a PIN diode. The former diode ensures that a high magnitude pulse does not leave the receiver undesirably insensitive to a following smaller pulse. The latter diode, due to its low self-capacitance and low leakage, overcomes distortions due to the Schottky diode's higher self-capacitance and leakage. These effects are enhanced by providing the series-connected diodes with a low value (e.g. 0.2 volts) of reverse bias, due to the different connections of the diodes and the feedback resistor to a potential divider between the amplifier output and a point at a reference potential.

REFERENCES:
patent: 4218613 (1980-08-01), Bletz
patent: 4323774 (1982-08-01), Kopp
patent: 4620321 (1986-10-01), Chown

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