Impact of the electronic architecture of optical slot switching nodes on latency in ring networks

Speaker : Nihel Djoher Benzaoui
Date: 26/02/2014
Time: 2:30 pm - 3:00 pm
Location: LINCS Meeting Room 40


An optical slot switching node network called POADM (packet optical add-drop multiplexers) has formerly been proposed as a flexible solution for metropolitan ring networks to carry data traffic with a sub-wavelength switching granularity and with a good energy efficiency, which is enabledby optical transparency. In this paper, for the first time we propose several architectures for the electronic side of optical slot switching nodes to increase flexibility through the addition of electronic switches, working either at client packet granularity or at slot granularity; such electronic switches can be located at either transmitter, receiver, or both sides of a node, thereby decreasing traffic latency, at the expense of increased node cost and/or energy consumption. This paper focuses on the latency aspect. We investigate the impact of a timer that can be used to upper bound the slots insertion time on the medium. We also propose, for the first time, a queuing model for optical slot switching ring and assess and compare the latency of these node architectures analytically using queuing theory, and with simulations.