Abstract
In this paper, we present two different strategies of slot synchronization in wavelength-division-multiplexing
(WDM) packet-switched slotted-ring networks. Emphasis is given to the architecture behind the WDM Optical Network
Demonstrator over Rings (WONDER) project, which is based on tunable transmitters and fixed receivers. The WONDER
experimental prototype is currently being developed at the laboratories of Politecnico di Torino. In the former
strategy, a slot-synchronization signal is transmitted by the master station on a dedicated control wavelength; in
the latter, slave nodes achieve slot synchronization aligning on data packets that are received from the master. The
performance of both synchronization strategies, particularly in terms of packet-collision probability, was evaluated
by simulation. The technique based on transmitting a timing signal on a dedicated control wavelength achieves better
performance, although it is more expensive due to the need for an additional wavelength. However, the technique
based on aligning data packets that are received from the master, despite attaining lower timing stability, still
deserves further study, particularly if limiting the number of wavelengths and receivers is a major requirement.
Some experimental results, which were measured on the WONDER prototype, are also shown. Measurement results,
together with theoretical findings, demonstrate the good synchronization performance of the prototype.
© 2007 IEEE
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