Abstract
The impact of the in-band crosstalk on the performance of virtual carrier (VC)-assisted direct detection (DD) multi-band orthogonal frequency division multiplexing (MB-OFDM) systems was numerically assessed via Monte-Carlo simulations, by means of a single interferer and 4-ary, 16-ary and 64-ary quadrature amplitude modulation (QAM) formats in the OFDM subcarriers. It was also investigated the influences of the virtual carrier-to-band power ratio (VBPR) and the virtual carrier-to-band gap (VBG) on the DD in-band crosstalk tolerance of the OFDM receiver. It was shown the modulation format order decrease enhances the tolerance to in-band crosstalk. When the VBG is the same for both interferer and selected signal, the interferer VBPR increase is seen to lead to lower optical signal-to-noise ratio (OSNR) penalties due to in-band crosstalk. Considering that the VCs frequencies of the selected and interferer OFDM signals are equal, the increase of the interferer VBG also gives rise to lower OSNR penalties. When the interferer and selected signals bands central frequencies are the same, the change of interferer VBG can attain 11 dB less tolerance to in-band crosstalk of the VC-assisted DD OFDM system. We also evaluate the error vector magnitude (EVM) accuracy of the in-band crosstalk tolerance of the DD OFDM receiver and our results show that the EVM estimations are inaccurate.
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Acknowledgements
This work was supported by Fundação para a Ciência e Tecnologia (FCT) from Portugal through Project MORFEUS-PTDC/EEITEL/2573/2012. The project UID/EEA/50008/2013 is also acknowledged.
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Pinheiro, B.R., Rebola, J.L., Cartaxo, A.V.T. (2018). Estimation of the OSNR Penalty Due to In-Band Crosstalk on the Performance of Virtual Carrier-Assisted Metropolitan OFDM Systems. In: Ribeiro, P., Raposo, M. (eds) Optics, Photonics and Laser Technology. Springer Series in Optical Sciences, vol 218. Springer, Cham. https://doi.org/10.1007/978-3-319-98548-0_3
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DOI: https://doi.org/10.1007/978-3-319-98548-0_3
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