High-capacity, terrestrial optical transmission systems are now being widely deployed offering aggregate capacities >1 Tb/s over distances of >1,000 km. They use dense wavelength-division multiplexing (DWDM) techniques in combination with high-speed electrical time-division multiplexing (ETDM) to minimize the cost per bit and kilometre whilst maintaining flexibility and scalability at the same time.

© 2002 Optical Society of America

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