Data-transmission system and method using fiber-optical transmis

Details Data-transmission system and method using fiber-optical transmis Data-transmission system and method using fiber-optical transmis

1978-10-05

1980-05-06

Britton, Howard W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

340347DD, 358262, 360 44, 455612, 375 25, H04B 900

Patent

active

042019095

ABSTRACT:
For the transmission of data by way of a fiber-optical path, three-bit code words representing eight different signal levels are generated in respective signal periods 2T and are converted into pairs of ternary luminous waveforms of duration T having two possible amplitude levels L (low) and H (high). Each waveform pair includes at least one but not more than two light pulses H, of a width not exceeding T/2, occurring in either of two time positions within a cycle T. At the receiving end, the incoming light pulses are modulated--either before or after conversion into electrical signals--with a ramp signal of recurrence period T which transposes the pulses H to either of two elevated amplitude levels depending upon their time position within a cycle, with the pulses L remaining at a low level. The resulting electrical pulses are integrated over successive periods equal to T and sampled in each of these periods for comparison with predetermined thresholds.

REFERENCES:
patent: 3281806 (1966-10-01), Lawrance
patent: 3792454 (1974-02-01), Lipp
patent: 3920898 (1975-11-01), Torpie
patent: 3993862 (1976-11-01), Karr
patent: 4008390 (1977-02-01), Runge
patent: 4091272 (1978-05-01), Richter
patent: 4101934 (1978-07-01), Fukuoka
patent: 4103234 (1978-07-01), Frazier
patent: 4153814 (1979-05-01), Burgert

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