Optical fdm system

Details Optical fdm system Optical fdm system

H - Electricity

04

J

363/1.8

H04J 1/06 (2006.01) H04B 10/145 (2006.01) H04B 10/155 (2006.01) H04Q 11/00 (2006.01)

Patent

CA 1213382

OPTICAL FDM SYSTEM Abstract of the Disclosure In an optical fibre FDM system, the carriers are derived from the output of a high quality Master Oscillator, which output at frequency fo is applied to a Raman Nath modulator (RNM1) whose other input is a frequency fo this gives as its outputs (assuming a five channel system) fo - 2f, fo - f, fo, fo + f and fo + 2f. These are modulated by modulators (CM1, to CM5) with the signals to be sent, and the modulation results combined in a combiner CB for transmission to a remote station. The oscillator output is also sent to the remote stations where it is frequency-shifted by a Bragg modulator (BM) and the resultant similarly dealt with by a Raman Math device (RNM2) to give five frequencies which are used to demodulate the channels. In an alternative the channel frequencies are switchable.

457820

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