Optimization Analysis of Optical Time Slot Interchanges in All-Optical Network

H. Zeineddine, P. He, and G.v. Bochmann (Canada)


Optimization, time-slot interchanger, wavelength converter, performance model


A passive optical time slot interchanger (POTSI) is a simplified form of the Optical Time Slot Interchanger (OTSI). OTSIs are well known devices used in designing optical TDM switches to switch traffic in the time domain (i.e. inter-changing timeslot positions). Employing timeslot interchangers in optical TDM is similar to employing wavelength converters in WDM. The former converts between wavelengths, and the latter between timeslots. In this paper, we conduct a comparison between POTSI and the various OTSIs noted in the literature in terms of fiber length, crossbar size, and number of switching operations. Furthermore, we propose an optimized form of POTSI, Limited Range POTSI (POTSI-LR), which can switch a timeslot within a subset of nearby slots in a frame. We investigate the sharing of POTSI-LR as opposed to the dedication of one device per link. Finally, we analyze the network performance in terms of blocking probability and system complexity.

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