Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1985-01-18
1988-11-08
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9614, 350374, 350401, H04B 900
Patent
active
047838515
ABSTRACT:
The optical communication system of the invention comprises an optical transmission line, optical coupling devices, each having a varying coupling ratio, connected to the transmission line, and stations connected to the optical coupling devices; wherein the coupling ratio of the device is changed to a predetermined value by a control signal applied by its associated station, depending on the state of transmission and reception, level of received signal, operating state of the station, and the like, to thereby provide high reliability, reduced transmission delay and low error rate, as well as to thereby decrease the amount of attenuation between transmitting and receiving stations.
REFERENCES:
patent: 4201450 (1980-05-01), Trapani
patent: 4252402 (1981-02-01), Puech et al.
patent: 4461543 (1984-07-01), McMahon
patent: 4501021 (1985-02-01), Weiss
Inou Kiyoharu
Naito Seiichi
Sampei Yoshihiro
Beek L. Van
Griffin Robert L.
Kojima Moonray
Yokogawa Electric Corporation
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