Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-11-05
1985-04-16
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455606, G02B 514
Patent
active
045112088
ABSTRACT:
An optical communication system includes a plurality of stations and at least two passive optical couplers. Each of the couplers has at least four pairs of ports, each pair including an input port and an output port. An optical signal inputted to any one of the input ports is outputted to all of the output ports except the output port of the pair into which the optical signal was inputted. A plurality of optical signal transmission lines interconnect the passive optical couplers and connect the passive optical couplers to the stations. Passive optical couplers of both the transmission type and the reflection type are disclosed. The transmission type passive optical couplers rely either upon the direct interconnection of the appropriate input ports and output ports or upon diffraction to guide optical signals to the correct output ports. The reflection type passive optical couplers rely upon a diffraction grating or a plurality of reflective surfaces to direct incoming optical signals to the appropriate output ports.
REFERENCES:
patent: 3874781 (1975-04-01), Thiel
patent: 3883217 (1975-05-01), Love et al.
patent: 4072399 (1978-02-01), Love
patent: 4341438 (1982-07-01), Seki et al.
"Fibernet: Multimode Optical Fibers for Local Computer Networks", IEEE Transactions on Communications, vol. COM-26, No. 7, pp. 983-990, Jul. 1978; E. G. Rawson et al.
Ozeki Takeshi
Tamura Toshifumi
Sikes William L.
Tokyo Shibaura Denki Kabushiki Kaisha
Ullah Akm E.
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