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The Americas-1N system is a 2100-km erbium-doped-fiber-amplifier undersea system that connects Vero Beach, Florida, and the island of Saint Thomas in the U.S. Virgin Islands. It has two line pairs, each operating at 2.5 Gbit/s, with a single NRZ channel centered at 1558.5 nm. In this work we looped back one of the line pairs at Saint Thomas for a total system length of 4200 km, and we added a second 2.5-Gbit/s channel at 1557.5 nm to the already-operating line. This was done to demonstrate the potential for upgrading an installed undersea optical system by using WDM techniques at the terminals with no changes to the undersea plant.
© 1995 Optical Society of America
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