Optical receiver having collision detection function

Details Optical receiver having collision detection function Optical receiver having collision detection function

1983-04-26

1985-07-23

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

3408255, 370 85, 370 94, 455612, 455619, H04B 900

Patent

active

045312397

ABSTRACT:
A signal collision detection device for an optical receiver forming a part of an optical local area network which interconnects a number of optical transceivers using optical fibers. The signal collision detection device operates to inform the receiver whether it is receiving a signal from only one transmitter or simultaneously receiving signals from two or more network transmitters. The signal collision detection device includes at least a differentiating circuit, a decision circuit, and a collision detection circuit. The differentiating circuit, which has a time constant sufficiently small to discriminate the leading and trailing edges of incoming pulse signals, converts the incoming signal into a bipolar balanced code of pulses of one polarity corresponding to a rising edge and of the other polarity corresponding to a falling edge. The decision circuit detects the polarity of the pulses produced by the differentiator circuit and supplies this information to the collision detection circuit. The collision detection circuit monitors the positive and negative pulses and indicates that successive pulses are the same or opposite polarity. A single incoming signal is detected when successive pulses are of opposite polarities. An incoming signal composed of more than one signal is detected when successive pulses are of the same polarity.

REFERENCES:
patent: 4229831 (1980-10-01), Lacher
patent: 4234968 (1980-11-01), Singh
patent: 4337457 (1982-06-01), Tache
Rawson et al.--"Transmissive Star Coupler"--Conf. Laser & Electrooptical Systems, San Diego, Calif.--Feb. 7-9, 1978, pp. 52-54.
Rawson et al.--"Fibernet II: An Active Star-Configured Fiber Optic Local Computer Network"--Fifth Topical Meeting on Optical Fiber Comm., Apr. 13-15, 1982, Phoenix, Ariz., pp. 22-23.

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