Multiplex communications – Wide area network – Packet switching
Patent
1985-04-08
1988-02-16
Orsino, Jr., Joseph A.
Multiplex communications
Wide area network
Packet switching
455617, 455619, H04B 900
Patent
active
047260114
ABSTRACT:
The method and associated system for providing increased information carrying capacity in optical fiber communication through frequency-division-multiplexing, comprising the steps of generating a reference optical beam, generating a plurality of closely spaced optical carriers having frequencies which are coherently related to the reference frequency of the reference optical beam and which are capable of drifting with the reference frequency while maintaining coherence therewith, and combining the plurality of closely spaced optical carriers to provide a multiplexed optical output beam. Advantageously, a frequency tracking optical beam tracks the reference optical beam and the plurality of closely spaced optical carriers of the multiplexed optical output beam are optically heterodyne detected by the tracking optical beam to convert the plurality of closely spaced optical carriers into a microwave spectrum, so that the individual carrier frequencies present in the microwave spectrum which correspond to the frequencies of the plurality of closely spaced optical carriers may be electronically heterodyne detected and separated from the microwave spectrum.
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Ih Charles C.
Kao Charles K.
ITT Defense Communications a Division of ITT Corporation
Orsino Jr. Joseph A.
Twomey Thomas N.
Walsh Robert A.
Werner Mary C.
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