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Opt Express. 2012 Nov 19;20(24):26958-68. doi: 10.1364/OE.20.026958.

Rapid and complete hitless defragmentation method using a coherent RX LO with fast wavelength tracking in elastic optical networks.

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  • 1Department of Electrical and Computer Engineering, University of California, Davis, Davis, California 95616, USA. rproietti@ucdavis.edu


This paper demonstrates a rapid and full hitless defragmentation method in elastic optical networks exploiting a new technique for fast wavelength tracking in coherent receivers. This technique can be applied to a single-carrier connection or each of the subcarriers forming a super-channel. A proof-of-concept demonstration shows hitless defragmentation of a 10 Gb/s QPSK single-carrier connection from 1547.75 nm to 1550.1 nm in less than 1 ┬Ás. This was obtained using a small (0.625 kB) link-layer transmitter buffer without the need for any additional transponder. We also demonstrated that the proposed defragmentation technique is capable of hopping over an existing connection, i.e. 10 Gb/s OOK at 1548.5 nm, without causing any degradation of its real-time Bit Error Rate (BER) value. The proposed scheme gives advantages in terms of overall network blocking probability reduction up to a factor of 40.

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