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In order to accommodate enormous amount of traffic in the future Internet, Optical Packet Switching (OPS) technology has been researched as one of promising technologies with lower power consumption. One of the major issues for performing asynchronous OPS technologies with variable length packets is efficient buffering function for avoiding contention in optical domain due to the fact that optical RAM will not be mature in near future. Currently, Fiber Delay Lines (FDLs) providing contention resolution functions in time domain are practical solution especially for multi-wavelength OPS where contention resolution in wavelength domain can not be applied.
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