W. Van Parys, P. Arijs, P. Demeester, "Evolution towards Transparent Optical Networks using Selective Wavelength Regeneration and Conversion", NFOEC 2001.

Abstract: In this paper we introduce the concept of transparent OXCs exploiting
selective wavelength regeneration as a building block for ultra long-haul optical
networks. Depending on the maximum transparency length, the node can be equipped
with the suitable amount of regeneration. In this paper we study the relationship between
increased transparency length and amount of regeneration required for different network
topologies and traffic patterns.