Abstract
We propose and demonstrate an adaptive quality of transmission (QoT)
restoration scheme combining the methods of lightpath rerouting and modulation-format
switching to overcome real-time impairments in elastic optical networks. A
hybrid objective algorithm is designed to minimize the spectral consumption
and the interference that the rerouting imposes on the other parts of the
network. Simulation results show the algorithm achieved more than 50% reduction
in blocking probability and 75% decrease in the spectral consumption on the
bypass links compared with the rerouting-only method. Testbed experiments
demonstrated successful real-time QoT restoration in the presence of time-varying
optical signal-to-noise ratio impairment for two simultaneously impaired 100
and 200 Gb/s quaternary phase-shift keying superchannels.
© 2012 IEEE
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