Carrier position composite triple beat reduction using the Golomb ruler

摘要

The composite triple beat (CTB) is all the discrete third order inter-modulation distortions (IMD/sub 3/) that are produced at a channel or around a carrier when two or more signals are of different frequencies are input to a device or system with non-linearity. The carrier position composite triple beat is the CTB that fall directly onto the channel designated for use. They can limit the performance of the radio-over-fibre system as they interfere destructively with carriers that reside in these channels and cause the carriers to appear lowered. An experiment was performed to determine the carrier position CTBs when the channels to be used were arranged in accordance to the Golomb ruler's marks. It was found that the Golomb ruler based frequency plan indicated reduction in the carrier position CTBs as compared to when the channels were equal frequency spaced. The decrease in carrier position CTB led to CTB reduction factor of above OdB and decrease in carrier suppression or interference by the carrier position CTB.