Telecommunication systems

Details Telecommunication systems Telecommunication systems

1979-04-12

1980-11-25

Britton, Howard W.

Multiplex communications

Wide area network

Packet switching

332 751, 455611, 455615, H04B 900

Patent

active

042362431

ABSTRACT:
A telecommunication system has a laser-energized multimode optical fibre highway. Data is entered on to the highway by means of a series of modulators each operating at a different subcarrier frequency. At the far end of the highway demodulation is carried out be a quadrant photodetector which applies each of its outputs to a respective set of channels. Each channel in a set has a band pass filter centered on a subcarrier frequency followed by a non-linear device. The signals from all the channels of different sets carrying the same subcarrier frequency are combined and the signals passed through band pass filters centered on the second harmonic of the subcarrier frequency.

REFERENCES:
patent: 3654473 (1972-04-01), Nussmeier
patent: 3953727 (1976-04-01), d'Auria
patent: 4002896 (1977-01-01), Davies

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