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Technology Won’t Let Fiber Nets Be Idle

Wave7 Optics said Monday that it will demonstrate a patent-pending technique that reduces interference on television signals being transmitted in fiber-to-the-home networks at the Society of Cable Telecommunications Engineers’ Cable-Tec Expo in Denver, which begins Wednesday.

The Atlanta-based company said it developed a technique for eliminating interference from the use of idle codes, which are messages sent intermittently when no data is being sent, according to chief technology officer Jim Farmer.

The sending of the codes are, relatively speaking, bursts of activity that can lead to interference between frequencies -- a phenomenon known by engineers as “Stimulated Raman Scattering,” he said.

Wave7’s technique, by contrast, sends data continually in order to eliminate the effect. The data that fill what had been empty periods is not needed, but they eliminate the crosstalk that can affect four or five channels in a 140-channel system, Farmer added.

Wave7 supplies equipment for passive optical networks.