Optical Path Cross-Connect Node Architecture with High Modularity for Photonic Transport Networks

Atsushi WATANABE  Satoru OKAMOTO  Ken-ichi SATO  

IEICE TRANSACTIONS on Communications   Vol.E77-B   No.10   pp.1220-1229
Publication Date: 1994/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
photonic transport network,  optical path,  wavelength division multiplexing,  cross-connect,  modularity,  

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Creating a bandwidth abundant B-ISDN requires the further development of path technologies. Optical path cross-connect nodes (OXCs) will be required that offer very high levels of expandability. The present limited traffic demands must be efficiently supported while permitting easy step-wise expansion in capacity. This paper proposes two OXC architectures that offer high modularity with regard to incoming/outgoing links or the number of multiplexed wavelengths in each link. This paper briefly reviews, for optical path realization, the wavelength path (WP) and the virtual wavelength path (VWP) techniques. The proposed OXC architectures provide flexibility and minimum investment to encourage introduction but support incremental network growth and investment to match traffic demand. The architectures make it easy to upgrade a WP network to a VWP network, simply by replacing some optical components. It is also shown that the proposed OXC architectures ensure effective optical signal detection after a long-haul optical fiber transmission because they minimizes signal power losses within the OXC. Therefore, the proposed OXC architecture can be applied to global area networks. The proposed OXC architectures will play a key role in realizing the optical path infrastructure for the future bandwidth abundant B-ISDN.