## Abstract

Planar permutation networks are a class of multistage switching networks with no crossover between paths that interconnect switching elements. A well-known class of planar networks is the N-Stage network that provides a good compromise between the crossbar and the Benes network. In this paper, we address the problem of designing cost-effective N-Stage optical planar networks with space-wavelength switching capability. Such networks are used for switching in communication and computing systems that employ Wavelength Division Multiplexing (WDM) technology. We investigate two classes of space-wavelength N-stage planar networks, and for each class, we design a number of switching networks and analyze their hardware complexity. In addition, we propose a new method for designing a class of space-wavelength planar networks with reduced complexity. It is shown that, for F ≤ W (where F is the total number of fibers and W that of wavelengths) the proposed method results in planar networks with an average of 67% reduction in overall cost compared to that of networks based on fixed-range wavelength converters.

Original language | English (US) |
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Pages (from-to) | 297-312 |

Number of pages | 16 |

Journal | Photonic Network Communications |

Volume | 13 |

Issue number | 3 |

DOIs | |

State | Published - Jun 2007 |

## Keywords

- Optical switching
- Permutation networks
- Planar networks
- Wavelength converters
- Wavelength division multiplexing
- Wavelength exchange optical crossbar

## ASJC Scopus subject areas

- Software
- Atomic and Molecular Physics, and Optics
- Hardware and Architecture
- Computer Networks and Communications
- Electrical and Electronic Engineering