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Technology Stocks : C-Cube

CUBE 36.29

+1.9%

Nov 21 9:30 AM EST

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To: BillyG who wrote (48530)	2/3/2000 8:37:00 AM
From: John Rieman	Read Replies (1) of 50808

Lucent's DWDM research............................... eet.com DWDM uses individual segments of the optical spectrum to multiplex signals on a fiber. The idea is recent, considered at first to be a laboratory curiosity since practical systems were already multiplexing channels with a time-division technique. Such synchronous optical networks (Sonet) had been able to extend the capacity of optical fiber and were a welcome development. The wavelength-division multiplexing route has turned out to have far more potential: Bell Labs researchers recently demonstrated a DWDM transmission system capable of sending a terabit of data per second down a fiber. "That represents the entire world's Internet on a single glass fiber," Glass said. The DWDM revolution has been extremely swift. When Lucent Technologies was established, DWDM was still at the laboratory demonstration stage. While the idea is simple, turning it into practical optical communications systems required a multifaceted development. Multiple-wavelength laser-diode systems and new types of fiber able to carry the multiple wavelength signals without crosstalk had to be developed. And some means of collectively amplifying multiwavelength signals had to be invented. While those problems were effectively solved in a short time, it wasn't easy. Indeed, one outstanding problem has never been solved: how to regenerate multiple wavelength signals.

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