Method of transmitting an information signal

Details Method of transmitting an information signal Method of transmitting an information signal

H - Electricity

04

B

H04B 10/24 (2006.01) H04B 1/26 (2006.01) H04B 10/152 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2315869

In a communications network with a center and a number of intermediate facilities, optical signals generated at the center are transmitted to the intermediate facilities unmodulated, where they are fed to modulators (M1, M2, M3, M4) to modulate them with information signals to be transmitted. The modulated signals are then transmitted from the intermediate facilities to the center without any separate light sources being necessary in the intermediate facilities. The unmodulated optical signals contain CW light, for example. Alternatively, they contain carrier frequencies, which are additionally used for optical heterodyne detection. The introduction of WDM permits the transmission rate to be increased both in the downstream channel and the upstream channel and enables different intermediate facilities to transmit different types of information at the same frequencies.

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