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We introduce a new preemptive scheduling technique for next-generation optical burst switching ͑OBS͒ networks considering the impact of cascaded wavelength conversions. It has been shown that when optical bursts are transmitted all optically from source to destination, each wavelength conversion performed along the lightpath may cause certain signal-to-noise deterioration. If the distortion of the signal quality becomes significant enough, the receiver would not be able to recover the originaldoi:10.1117/1.3363610 fatcat:s2merduf5fe5rcw3afyhdkckc4