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Spectral Shape Impact of Nonlinear Compensator Signal in LTE RoF System

Lookup NU author(s): Dr Paul Haigh

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Abstract

© 2015 IEEE.In this letter, a large scale investigation is carried out, utilizing several spectral shapes as the source for direct modulation-based frequency dithering (DMFD). DMFD mitigates the nonlinear effect of long-term evolution radio-over-fiber systems. The dithering signal shapes are sine, square, saw, sinc, and Gaussian with different spectral width characteristics. We show that by varying the dithering signal with increasing spectral width, no additional distortion is introduced in the linear and optimum optical launch power regions, which are dominated by the frequency chirp and chromatic dispersion. In addition, it is revealed herein that introducing dithering signals with varying spectral widths does not change the nonlinear compensator characteristic toward suppression of nonlinearity. The reason for this is that as long as the optical source linewidth is larger than stimulated Brillouin scattering (SBS) linewidth, the proposed method completely suppresses SBS. Finally, the degree of freedom for the dithering signal is infinite, with an optical power budget improvement of up to 8 dB at an optical launch power of 10 dBm, which can in turn be used towards connecting multiple relay nodes.


Publication metadata

Author(s): Kanesan T, Mitani SM, Mohamad R, Hizan HM, Ng WP, Ghassemlooy Z, Rajbhandari S, Haigh PA, Chang G-K

Publication type: Article

Publication status: Published

Journal: IEEE Photonics Technology Letters

Year: 2015

Volume: 27

Issue: 23

Pages: 2481-2484

Print publication date: 01/12/2015

Online publication date: 30/07/2015

Acceptance date: 26/07/2015

ISSN (print): 1041-1135

ISSN (electronic): 1941-0174

Publisher: IEEE

URL: https://doi.org/10.1109/LPT.2015.2462122

DOI: 10.1109/LPT.2015.2462122


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