Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1983-08-17
1986-04-08
Lee, John
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455612, 250227, G02B 628
Patent
active
045808724
ABSTRACT:
A fiber optic Local Area Network containing more than one transmitter-receiver combination capable of transmitting and receiving light energy over optical fibers and being deactivatable during transmission upon receiving a jam signal, a coupler means, a collision detection means for detecting when more than one transmitter is transmitting at the same time, and a plurality of optical fibers connecting the coupler means to said transmitter-receiver combinations and forming transmitting and receiving light paths there between, the collision-detection means comprising a tap means connected to each transmitting optical fiber for diverting a portion of the transmitted light energy; an optical receiver means for each optical fiber containing a tap adapted to detect that portion of an optical signal diverted by said tap means; an optical path between each tap means and a single optical receiver means; a logic means connected to said optical receiver means responsive to and adapted to transmit a predetermined signal when two or more simultaneously co-existing optical signals are detected in two or more optical receiver means; a jam signal means adapted to be activated by the predetermined signal emitted by the logic means and to transmit a jam signal to each transmitter-receiver combination, and a means in the transmitter-receiver combination to detect and is responsive to the jam signal.
REFERENCES:
patent: 4233589 (1980-11-01), Rawson et al.
patent: 4369524 (1983-01-01), Rawson et al.
patent: 4422179 (1983-12-01), Albanese
patent: 4491942 (1985-01-01), Witte et al.
Bhatt Vipul J.
Jones J. Richard
Kelley Richard P.
FiberLAN, Inc.
Lee John
Moffitt Roy B.
Rushin, III Lester
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