An Architecture for Optical Ring Trunk-Transmission Networks

Masahito TOMIZAWA
Yoshiaki YAMABAYASHI
Nobuyuki KAWASE
Yukio KOBAYASHI

Publication
IEICE TRANSACTIONS on Communications   Vol.E79-B    No.8    pp.1121-1128
Publication Date: 1996/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
Keyword: 
optical ring trunk-transmission networks,  ADM,  timeslot (wavelength) sorting,  self-healing algorithm,  

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Summary: 
This paper provides an architectural study of optical ring trunk-transmission networks using either Time Division Multiplexing (TDM) or Wavelength Division Multiplexing (WDM). A timeslot arrangement algorithm for distributed controlled TDM rings is proposed that minimizes the number of slots (wavelengths) required in bi-directional ring networks. This algorithm is applied in a straightforward manner to wavelength arrangement in WDM ring networks. The technique, characterized by timeslot (or wavelength) conversion, realizes common add/drop procedures in all Add/Drop Multiplexers (ADMs) when they are connected logically in a mesh topology. A self-healing algorithm is also proposed for network restoration. It offers good performance in terms of protection line-capacity, restoration delay, and survivability against multiple failures.