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Technology Stocks : Nortel Networks (NT) -- Ignore unavailable to you. Want to Upgrade?

To: Paul Lee who wrote (2189)	3/11/1999 9:36:00 AM
From: Kenneth E. Phillipps	Respond to of 14638

Bell Canada is conducting trial of Metro DWDM americasnetwork.com March 05, 1999 Exclusive Website Story NORTEL MARKS OPTICAL MILESTONES WITH METRO SYSTEM AND TUNABLE LASER Annie Lindstrom Bell Canada (Montreal) recently announced plans to trial Nortel Networks' (Brampton, Ontario) OPTera Metro open dense wavelength division multiplexing (DWDM) solution. Nortel recently reintroduced the system as a member of its own portfolio at the Optical Fiber Conference in San Diego. The system had been developed by Cambrian Systems Corp., which Nortel acquired late last year. Successful completion of the trial is expected to result in network deployment within the next six months, according to Bell Canada. The OPTera Metro system will enable the carrier to use up to 32, ring-protected wavelengths per fiber to transport all types of traffic, including synchronous optical network (Sonet), Enterprise Systems Connection (ESCON), fiber distributed data interface (FDDI), fast/gigabit Ethernet, asynchronous transfer mode (ATM) and video. The system allows data services to be networked in their native format through a single interface in the system. TUNE A WAVE In related news, Nortel Networks announced its development of the tunable, 15-nanometer (nm) distributed feedback (DFB) laser that supports 18 channels on the 100-GHz DWDM grid and 36 channels on the 50-GHz grid. The new laser resides in a highly reliable, easily controllable, and extremely stable package, according to Nortel. The milestone is a major development in tunable lasers, which are key components for containing design and manufacturing complexity as the number of wavelengths in DWDM systems escalates into the 100-plus range, says Chris Clarke, product manager for Nortel Networks, Optoelectronics Division. Unlike most of today's lasers manufactured for just a single wavelength, tunable lasers can be rapidly retained to support any one of several different wavelengths, he adds. Tunable lasers are likely to be used to route wavelengths in the optical domain, allowing network operators to route traffic over fixed paths to different points in the network simply by changing the laser emission wavelength. Other applications could include network protection, future wavelength-based virtual private networks, and using wavelengths as spares so that network operators do not have to maintain large and costly inventories of lasers. The new laser chip, samples of which will be available in the third quarter of this year, contains three separate cascaded electrode sections, each with a 5-nm tuning range. The laser device is continuously tuned to different wavelengths over the 15-nm range by varying the temperature, and one section at a time is biased to allow light to pass transparently through the next section. The 15-nm technology can be extended to a 30-nm tuning range – doubling the number of wavelengths – by coupling two of the devices together into the same fiber, according to Nortel. Back to home Copyright 1999 Advanstar Communications. Please send any technical comments or questions to the America's Network webmaster.