Title :
A generic time driven fractional wavelength OCS
Author :
Rosberg, Zvi ; Ostry, Diethelm
Author_Institution :
ICT Centre, CSIRO, Sydney, NSW, Australia
fDate :
June 28 2009-July 2 2009
Abstract :
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, we presented and analysed a deterministic frame scheduler with optimal delays, based on the uniformity properties of the golden ratio (GR). The scheduler of 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.
Keywords :
circuit switching; optical fibre networks; optical switches; stochastic processes; telecommunication traffic; wavelength assignment; wavelength division multiplexing; Poissonian frame arrival process; UTC; WDM; frame switching; generic time driven fractional wavelength OCS; golden ratio; multiple optical link; optical switch; optimal delay; traffic grooming; universal time clock; wavelength allocation; Circuits; Optical buffering; Optical fiber networks; Optical interconnections; Optical packet switching; Optical switches; Optical wavelength conversion; Telecommunication traffic; Traffic control; WDM networks; All optical networks; Fractional wavelength; Long range dependence; Optical circuit switching, Restricted golden ratio, Most regular sequences; Optical switches; Time-driven switches; Traffic grooming;
Conference_Titel :
Transparent Optical Networks, 2009. ICTON '09. 11th International Conference on
Conference_Location :
Azores
Print_ISBN :
978-1-4244-4825-8
Electronic_ISBN :
978-1-4244-4827-2
DOI :
10.1109/ICTON.2009.5185030