H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/1.9
H04J 3/04 (2006.01) H04J 99/00 (2009.01) G02F 1/00 (2006.01) H04J 14/02 (2006.01) H04J 14/08 (2006.01)
Patent
CA 1295431
ABSTRACT OF THE INVENTION An optical communications systems, e.g. a telephone system, comprising means to accept even electrical communication signals from transmitting sta- tions, modulate an optical signal with said signal from the transmitting station (20) and, using time-division- multiplexing (TDM), provide a resultant optical com- munication signal to a central station (908) which utilizes a frequency-division-multiplexing (FDM) system for handling incoming optical signals before passing the optical communication signals on the receiving sta- tion which utilizes time-division-demultiplexing means (400, 401, 402, 403) and, where necessary, reconverts the optical signal to an electrical communication signal. Particular advantages of the system are that it can handle and switch a very large number of signals and that it can be utilized in a hybrid communications system wherein, for example, users of the system can maintain conventional electrical entrance wiring (22) and conventional non-2optical telephones and yet inter- face readily with optical street lines (26, 28) of the system. Particular aspects of the invention are novel modulating and signal-selection devices.
546551
Hicks John W.
Smart & Biggar
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