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Technology Stocks : SDLI - JDSU transition -- Ignore unavailable to you. Want to Upgrade?

To: Baton who wrote (169)	2/15/2001 3:16:01 AM
From: pat mudge	Respond to of 3294

While exercising patience, here's an article on terrestrial DWDM: lw.pennwellnet.com . . .Early OC-768 networks are expected to be capable of transmitting data only across short spans of about 100 km to 400 km before needing signal regeneration. Analysts are predicting that initial deployments, starting as early as next year, will begin in metropolitan areas until long-haul transmission capability is commercially viable. Some in the industry believe that the regeneration and amplification issues associated with 40-Gbit/sec transmissions could be resolved as early as year's end. "I think the most efficient form of amplification is going to be distributed Raman amplifier erbium-doped fiber amplifier [EDFA] combinations [for high-capacity networks]," says George Wildeman, product-line manager for amplifiers at Corning Inc. (Corning, NY). The Raman amplifier is the preamplifier and the EDFA is the booster amplifier. "If you don't have Raman amplification in 40-Gbit/sec systems-even if you're not trying to do long reach-you could only space these repeater huts about every 40 km, which would not be economical. If you want to keep the standard 80- to 100-km hut spacings, then the distributed Raman EDFA amplification allows you to achieve that span distance. It's providing reduced noise, but it's also extending the span length. . . ."