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Virtual carrier-assisted DD-MB-OFDM schemes for UDWDM metro-access networks with improved tolerance to four-wave mixing

Cruz, P. E. D. ; Alves , T. M. F. ; Cartaxo, A.

IEEE/OSA Journal of Lightwave Technology Vol. 35, Nº 20, pp. 4468 - 4478, October, 2017.

ISSN (print): 0733-8724
ISSN (online): 0733-8724

Journal Impact Factor: 2,567 (in 2015)

Digital Object Identifier: 10.1109/JLT.2017.2743818

Abstract
Virtual carrier (VC)-assisted multi-band orthogonal frequency division multiplexing (MB-OFDM) schemes with improved tolerance to the four-wave mixing (FWM) effect in direct-direction ultradense wavelength division multiplexing metro-access networks are proposed and discussed. The best scheme is identified from a set of alternative schemes chosen with potential to increase the tolerance to the FWM effect in VC-assisted MB-OFDM systems. A data rate per band and per user of the metro-access network of 10 Gb/s and 25 Gb/s is considered for band spacings of 3.125 GHz and 6.25 GHz, respectively. With the proposed MB-OFDM schemes, increase of the maximum acceptable power launched into the fiber can be achieved. This increase translates into a similar power budget (PB) improvement. With band spacings of 3.125 GHz, a PB improvement of 3 dB is achieved, which enables to double the number of users served by the metro-access network or to extend the reach of the optical distribution network (ODN) by about 12 km. For a 6.25 GHz band spacing, a PB improvement exceeding 4 dB is achieved, enabling to double the number of users and simultaneously extend the ODN coverage by about 5 km.