Multiplex communications – Wide area network – Packet switching
Patent
1985-12-20
1988-03-08
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 3, 455607, 455616, 455617, H04B 900
Patent
active
047303018
ABSTRACT:
An optical fiber communications system includes a closed loop birefringent optical fiber bus for supporting optical energy propagated in a first and a second orthogonal polarization state. An optical energy source introduces a fixed frequency system wide carrier onto the optical fiber bus in a first polarization state for propagation in a first direction. Terminal devices coupled to the optical fiber bus include a bus tap resonator for removing a portion of the system wide carrier light and, in addition to modulating the removed light, effecting a frequency shift to a side frequency and effecting a state shift from the first to the other polarization state, and returning the information bearing optical energy to the optical fiber bus for propagation in a direction opposite to the first direction. A receiving device includes a bus tap resonator for removing a portion of the light from the bus and effecting demodulation to recover the information bearing signal.
REFERENCES:
AT&T Technical Digest, No. 75, Sep. 1984, "Subscriber Loop Architecture", Cheng et al.
Beek Leslie Van
Caufield Francis J.
Griffin Robert L.
Polaroid Corporation
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