Synchronization in a Random Length Ring Network for SDN-Controlled Optical TDM Switching

Valerija Kamchevska, Valentina Cristofori, Francesco Da Ros, Bingli Guo, Chris Jackson, Anna M. Fagertun, Sarah Ruepp, Reza Nejabati, Dimitra Simeonidou, Lars Dittmann, Michael Berger, Leif K. Oxenløwe, Michael Galili

Research output: Contribution to journalArticle (Academic Journal)peer-review

2 Citations (Scopus)
252 Downloads (Pure)


In this paper we focus on optical time division multiplexed (TDM) switching and its main distinguishing characteristics compared with other optical subwavelength switching technologies.We review and discuss in detail the synchronization requirements that allow for proper switching operation. In addition, we propose a novel synchronization algorithm that enables automatic synchronization of software defined networking controlled all-optical TDM switching nodes connected in a ring network. Besides providing synchronization, the algorithmalso can facilitate dynamic slot size change and failure detection. We experimentally validate the algorithm behavior and achieve correct operation for three different ring lengths. Moreover, we experimentally demonstrate data plane connectivity in a ring network composed of three nodes and show successful wavelength division multiplexing space division multiplexing transmission and switching of data bursts when using the proposed algorithm to provide synchronization.

Original languageEnglish
Article numberA26
Pages (from-to)A26-A34
Number of pages9
JournalIEEE/OSA Journal of Optical Communications and Networking
Issue number1
Early online date2 Jan 2017
Publication statusPublished - Jan 2017


  • Optical switches
  • Software defined networking
  • Synchronization
  • Time division multiplexing

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