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Alcatel Releases Core DWDM Gear

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10/2/2003
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DALLAS -- Alcatel (NYSE: ALA - News) has reinforced its family of dense wavelength division multiplexing (DWDM) products with the introduction of the Alcatel 1626 Light Manager, a new core Dense Wavelength Digital Multiplexing (DWDM) platform. The Alcatel 1626 Light Manager addresses long-haul to ultra long-haul terrestrial network applications as well as unrepeatered undersea applications in the core network and provides a migration path to network operators who want to improve their core networks while optimizing cost savings. The 1626 Light Manager combines the best of both undersea and terrestrial network technologies to provide unmatched performance at the lowest cost.

The Alcatel 1626 Light Manager offers an efficient solution to operators who want to extend and modernize their national or pan-continental optical networks while lowering the overall transmission cost-per-bit, by deploying new links or upgrading current DWDM systems. The new product platform provides enhanced transmission distance (4,500 km) and capacity (192 wavelengths at 10Gb/s).

With the Alcatel 1626, operators can continue to leverage their existing network equipment, whether from Alcatel or other vendors. The Alcatel 1626 Light Manager Optical Network Extender shelf enables in-service upgrades without traffic interruptions. In addition, it provides a continuity path to Alcatel 1686WM and 1640 OADM/WM DWDM systems by extending their performance up to 2,500 km.

The 1626 Light Manager's shelf offers best-in-class footprint and low power consumption with a single shelf for all configurations. Built to minimize operator capital expenditures and optimize operational expenditures, the Alcatel 1626 Light Manager supports the new ITU Optical Transport Network standard and boasts tunable transponders over the full spectrum range, high scalability, automated commissioning and self-maintenance features. In addition, re-configurable optical add-drop and cross connect functions are integrated with the platform to support the migration path to the fully automated optical transport network.

"With the introduction of the 1626 Light Manager, Alcatel is not only re- affirming itself as a technical leader in the field of WDM but also directly addressing the implementation and operational issues faced by our customers," said Romano Valussi, president of Alcatel's optical network activities. "We work with operators to plan their systems growth to be in line with their investment and capacity demands so that they have the most efficient, cost- effective core network possible."

The 1626 Light Manager is designed to complement and extend Alcatel's highly successful offering of regional and long haul DWDM products to achieve lower costs and superior system performances. Alcatel's DWDM product portfolio also takes full advantage of the operational benefits provided by Alcatel's integrated Network Management platform, offering end to end optical managed services for enhanced network efficiency and reliability.

Alcatel SA

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dwdm2
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dwdm2,
User Rank: Light Beer
12/4/2012 | 11:21:37 PM
re: Alcatel Releases Core DWDM Gear
"...when a (generally common) fiber gets cut, what happens to *all* the downstream channels??"

Can someone answer the same question for copper? How would a cut in a copper line be different than a cut in a fiber line?
PO
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PO,
User Rank: Light Beer
12/4/2012 | 11:21:36 PM
re: Alcatel Releases Core DWDM Gear
"...when a (generally common) fiber gets cut, what happens to *all* the downstream channels??"

Can someone answer the same question for copper? How would a cut in a copper line be different than a cut in a fiber line?
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Copper networks drop timeslots, or don't have amps in common. Fiber networks pass multiple wavelengths through the same amps on a common fiber.

My comment was referring to the instantaneous power spike on *other* channels at such common amps. At an extreme, let's say an amp (EDFA) is handling 128 channels: 127 from a 'thru' path, and one from a recent add/drop point. A fiber cut takes out the 127, but the one channel is unaffected.

At the amp, the input power drops by about 21dB (assuming equalized channel powers). Will the surviving channel's output power spike instantaneously (and if it does, how do we ensure it doesn't damage a receiver)? Will the amp think that all 128 channels are gone, and trip off? How does the single failure (fiber cut) not couple over to otherwise unaffected channels?

So I guess the questions are, how would this new gear eliminate failure mode coupling, and what failure mode coupling exists for copper?
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