title: Rapid and complete hitless defragmentation method using a coherent RX LO with fast wavelength tracking in elastic optical networks.
abstract: 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 µs. 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.
authors.affiliation: Department of Electrical and Computer Engineering, University of California, Davis, Davis, California 95616, USA. rproietti@ucdavis.edu
authors.forename: Roberto
authors.initials: R
authors.lastname: Proietti
authors.forename: Chuan
authors.initials: C
authors.lastname: Qin
authors.forename: Binbin
authors.initials: B
authors.lastname: Guan
authors.forename: Yawei
authors.initials: Y
authors.lastname: Yin
authors.forename: Ryan P
authors.initials: RP
authors.lastname: Scott
authors.forename: Runxiang
authors.initials: R
authors.lastname: Yu
authors.forename: S J B
authors.initials: SJ
authors.lastname: Yoo
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006801:Humans; D008490:Medical Informatics; D055100:Optical Fibers; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications / Q000295:instrumentation*