The authors propose a design method for hierarchical crossconnect wavelength-division-multiplexed networks employing a two-stage multiplexing scheme for waveband and wavelength, in order to reduce the complexity and size of optical crossconnect at the nodes. The waveband is formed by grouping lightpaths with the same destination in a network. The authors present an integer linear programming formulation for the routing and grouping of lightpaths, and a heuristic design method is also proposed as a practical method to find a design solution for general large-scale networks. It is found that the proposed design method can largely reduce crossconnect requirement, although it slightly increases the wavelength requirements.
Bibliographical noteFunding Information:
Manuscript received February 13, 2001; revised July 30, 2001. This work was supported in part by the Information and Telecommunication Research Center (ITRC) at Korea University and the Optical Internet Research Center (OIRC) at Information and Communications University, Korea. This work was presented in part at CLEO/Pacific Rim 2001, Chiba, Japan, July 2001.
- Communication system planning
- Hierarchical systems
- Linear programming
- Optical communications
- Wavelength-division multiplexing
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering