A generic time driven fractional wavelength OCS

Zvi Rosberg, Diethelm Ostry

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In current optical switches, an entire wavelength is switched from a source node to a single destination node, thereby precluding fractional wavelength allocation. This limitation results in two major problems: (i) N(N -1) wavelengths are required to fully connect a network with N edge nodes; and (ii) traffic arriving at the core switch from multiple optical links cannot be groomed in the optical domain. Whereas wavelength switching is feasible at a very fine time granularity, forwarding decisions are based on frame processing which is infeasible in the optical domain. However, the newly proposed time-driven optical switch based on a universal time clock (UTC) facilitates frame switching of a given wavelength without requiring frame content processing. In a previous paper [19], we presented and analysed a deterministic frame scheduler with optimal delays, based on the uniformity properties of the golden ratio (GR). The scheduler of [19] resolves the N(N -1) problem; however it leaves the traffic grooming open. In this study, we extend our GR scheduler to cope with the problem of traffic grooming. We further propose a model to analyse its performance and simulate it with Poissonian frame arrival processes. Surprisingly, the simulation demonstrates that our restricted GR scheduler performs as well as the strict GR and the idealized schedulers.

Original languageEnglish
Title of host publicationICTON 2009
Subtitle of host publication11th International Conference on Transparent Optical Networks
StatePublished - 18 Nov 2009
Externally publishedYes
EventICTON 2009: 11th International Conference on Transparent Optical Networks - Ponta Delgada, Portugal
Duration: 28 Jun 20092 Jul 2009

Publication series

NameICTON 2009: 11th International Conference on Transparent Optical Networks


ConferenceICTON 2009: 11th International Conference on Transparent Optical Networks
CityPonta Delgada


  • All optical networks
  • Fractional wavelength
  • Long range dependence
  • Optical circuit switching, restricted golden ratio, most regular sequences
  • Optical switches
  • Time-driven switches
  • Traffic grooming

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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