H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/1.8
H04J 14/02 (2006.01) H04B 10/145 (2006.01) H04B 10/155 (2006.01)
Patent
CA 1275513
A TECHNIQUE FOR REPELLING CARRIERS IN OPTICAL COMMUNICATIONS TO MINIMIZE MUTUAL INTERFERENCE Abstract The present invention relates to a technique for repelling carriers in a Frequency Division Multiplexed (FDM) lightwave communication system to minimize mutual interference between signals. The system comprises a plurality of transceivers (20), each comprising a transmitter section (30) and a receiver section (40) which is coupled to a separate user of the system on one side, and on the other side to a lightwave communication arrangement (21-23) that interconnects the plurality of transceivers. Each of the transmitter sections of the system uses a separate carrier (10-14) for transmitting an associated users' information signal, and, during each sequential test cycle period, slowly dithers this carrier in random order to a first nearby frequency (50), on one side of the nominal carrier frequency, and then to a second nearby frequency (51) on the other side of the nominal carrier frequency. Each receiver section monitors and measures the background interference at each of the first and second nearby side frequencies of the desired channel and sends a control signal back to the associated transmitter section to move the frequency of its carrier to the nearby side frequency indicating the least noise for the next testing cycle where the above technique is repeated.
558995
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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