Large-Scale WDM Star-Based Photonic

This paper describes the large-scale photonic asyn- chronous transfer mode (ATM) switching systems being devel- oped in NTT Laboratories. It uses wavelength division multi- plexing (WDM) techniques to attack 1 Tb/s throughput. The architecture is a simple star with modular structure and effec- tively combines optical WDM techniques and electrical control circuits. Recent achievements in important key technologies lead- ing to the realization of large-scale photonic ATM switches based on the architecture are described. We show that we can obtain a 320-Gb/s system that can tolerate the polarization and wavelength dependencies of optical devices. Our experiments using rack-mounted prototypes demonstrate the feasibility of our architecture. The experiments showed stable system operation and high-speed WDM switching capability up to the total optical bandwidth of 12.8 nm, as well as successful 10-Gb/s 4 4 broadcast-and-select and 2.5-Gb/s 16 16 wavelength-routing switch operations.

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