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The objective of this paper is to give an overview of the different st
udies we have performed at the research level regarding the design and
implementation of a photonic wavelength division multiplexing (WDM) l
ayer providing transparent transport services to client layers (SONET/
SDH, ATM, etc.). Such a network requires a number of enabling factors
to be assessed in order to become a reality. Among these factors are t
he availability of high-capacity WDM transmission systems and efficien
t optical routing nodes based on mature technology, the design of robu
st networks optimizing the utilization of resources, and the developme
nt of a management system in accordance with presently applied standar
ds for transport networks, In this paper we will review our recent ach
ievements in these different fields.