Authors : Mohamad Kadim Suaidi , Lisa Yong and Awangku Abdul Rahman B. Pgn. Hj. Yusof
Abstract: The analogue fibre optic system can be limited by the carrier position Composite Triple Beat (CTB), which is the sum of all the third order Inter-Modulation Distortions (IMD3) that appear at a channel accommodating a carrier as a result of the optical portions nonlinearity. The carrier position CTB might not be filtered off and is therefore liable of interfering destructively with the carrier. As a result, the carrier`s magnitude might appear to be lowered. An experiment was performed to determine the carrier position CTB for an analogue fibre optic link fed with 14 equal and unequal frequency spacings RF carriers with the presence of distortions in unused channels. The Golomb Ruler`s marks were referred to for obtaining the unequal frequency spacing carriers. The CTB appearing at carrier positions for the unequal frequency spacing case was found to be lower than when the equal frequency spacing was employed. In addition, the unequally spaced carrier-to-noise ratios were higher than the equally spaced carriers though some of the unequally carriers were lower in magnitude.
Mohamad Kadim Suaidi , Lisa Yong and Awangku Abdul Rahman B. Pgn. Hj. Yusof , 2006. Equal and Unequal Spacing Analogue Fibre Optic System Carrier Position CTBs . Journal of Engineering and Applied Sciences, 1: 60-65.