Receiver for unipolar Manchester fiber optics signals

Details Receiver for unipolar Manchester fiber optics signals Receiver for unipolar Manchester fiber optics signals

1979-05-01

1981-03-17

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455619, 375 55, 375 87, 340347DD, H04B 900

Patent

active

042571251

ABSTRACT:
A receiver is provided for use in a fiber optic data communication system of the type employing unipolar trapezoidal Manchester data encoding. The receiver of the invention is capable of processing unipolar optical Manchester signals transmitted over optical fibers. The receiver converts the optical signals into electrical base-band signals, and then amplifies, filters and detects the electrical signals to provide standard digital levels at the receiver output. The receiver incorporates direct-current coupled amplifiers, fast automatic gain control circuitry for the amplifiers, direct current offset correction circuitry to prevent drift of the signal base line, and threshold circuitry controlled to assure half peak amplitude, or mid-amplitude, processing of the electrical signals.

REFERENCES:
patent: 3836956 (1974-09-01), Cross
patent: 3979746 (1976-09-01), Jarrett
patent: 4019048 (1977-04-01), Maiome et al.

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