Multiplex communications – Wide area network – Packet switching
Patent
1989-05-03
1990-02-27
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 1, 34082565, 34087012, H04B 900
Patent
active
049052187
ABSTRACT:
An optical multiplex communication system in which n kinds of digital signals whose logical levels do not simultaneously become true, such as, pulse motor controlling pulses, are multiplexed through a single optical fiber line. The transmitting end generates n kinds of carrier clock signals of different frequencies by clock generating means, produces the respective logical products of the carrier clock signals and the digital signals and then produces a logical sum of the logical product outputs by logical circuits and converts the logical sum output to a light signal by a light transmitter, thereby delivering the light signal onto the single optical fiber line. On the other hand, the receiving end receives and reconverts the light signal to an electric signal by a light receiver, applies the electric signal to n band-pass filters each having a pass band corresponding to the frequency of one of the carrier clock signals to extract the signal according to the frequency, and then detects the filter output by detection circuit means to restore it to the transmitted digital signal.
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Hayashi Kiyoshi
Morishige Yuji
Shimomura Yasuo
Takeuchi Kunihiko
Safourek Benedict V.
Salindong T.
Tokyo Keiki Company Limited
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