Multiplex communications – Wide area network – Packet switching
Patent
1986-08-22
1987-12-01
Orsino, Joseph A.
Multiplex communications
Wide area network
Packet switching
455607, 455612, H04B 900, H04J 102
Patent
active
047109149
ABSTRACT:
An optical fiber telecommunication device comprises an interconnecting volume and N stations connected to this volume by pairs of transmit and receive optical fibers. Each station comprises a tunable optical frequency laser coupled to the transmit fiber and a heterodyne receiver system coupled to the receive fiber. It is provided with a tunable frequency laser local oscillator. The volume is disposed in a central office comprising a clock to determine different timing periods assigned to the N stations. The carrier frequency of the laser for each station is initially adjusted to a first frequency reserved for modulating ringing signals in the respective channels. The central office comprises a processor connected to the interconnecting volume to receive the ringing signals and designate a carrier frequency for each call request. This frequency is transmitted through the interconnecting volume to the calling station and the called station on a second reserved frequency. This is in order to adjust the frequency of the laser and the frequency of the local oscillator to the designated frequency. The designated frequencies are different for all calls in progress at the same time.
REFERENCES:
patent: 3573379 (1969-03-01), Schmitz
patent: 3864521 (1975-02-01), DeLong et al.
patent: 3986020 (1976-10-01), Kogelnik
patent: 4330869 (1982-05-01), Robieux
patent: 4530084 (1985-07-01), Strebel et al.
Compagnie General d'Electricite
Orsino Joseph A.
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