Wavelength-routed networks have received enormous attention due to the fact that they are relatively simple
to implement and implicitly offer Quality of Service (QoS) guarantees. However, they suffer from a bandwidth
inefficiency problem and require complex Routing and Wavelength Assignment (RWA). Most attempts to address
the above issues exploit the joint use of WDM and TDM technologies. The resultant TDM-based wavelength-routed
networks partition the wavelength bandwidth into fixed-length time slots organized as a fixed-length
frame. Multiple connections can thus time-share a wavelength and the grooming of their traffic leads to better
bandwidth utilization. The capability of switching in both wavelength and time domains in such networks also
mitigates the RWA problem. However, TMD-based wavelength-routed networks work in synchronous mode
and strict synchronization among all network nodes is required. Global synchronization for all-optical networks
which operate at extremely high speed is technically challenging, and deploying an optical synchronizer for each
wavelength involves considerable cost. An Optical Slotted Circuit Switching (OSCS) architecture is proposed in
this paper. In an OSCS network, slotted circuits are created to better utilize the wavelength bandwidth than
in classic wavelength-routed networks. The operation of the protocol is such as to avoid the need for global
synchronization required by TDM-based wavelength-routed networks.
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