Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-12-14
1989-05-02
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455612, G02B 628
Patent
active
048262757
ABSTRACT:
Optical communication system having repeater amplifiers cascaded with plurality of optical star couplers wherein each star coupler is coupled to an associated set of terminals. Each star coupler has two mixing sections serially disposed between its input and output terminal ports. Star couplers receive optical signals from their associated terminals, mix the received signals and retransmit the mixed signals to each terminal in its associated set and to each of the repeater amplifiers. Star couplers also receive amplified signals from the repeater amplifiers, mix the received amplified signal and retransmit the mixed optical signals only to their associated terminals. Star couplers, thus, enable optical signals transmitted by their associated terminals to be transmitted to each terminal in the system without permitting the same signal to be returned to the same star coupler, thereby avoiding the formation of continuous optical loops and hence avoiding the problem of optical lockup.
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Gonzalez Frank
LTV Aerospace and Defense Company
Sikes William L.
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