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Wavelength reuse in a WDM unidirectional ring network by using a fiber-grating add/drop multiplexer

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Abstract

This work is focused on unidirectional ring topology for upgrading the SDH networks.1-3 The ring consists of a central node (CN) connecting N secondary nodes (SNs) by links using dedicated wavelengths λ1 (i = 1,…, N) over one common fiber. Instead of using electronic ADM, the WDM ring uses optical-wavelength ADM (OW-ADM). Depending on the components used to perform the OW-ADM function, two structures are considered. In the first structure, the incoming wavelength selection is made by a 2:2 coupler and tunable filter.4 A new wavelength is added at each node.

© 1995 Optical Society of America

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