Spectral Shape Impact of Nonlinear Compensator Signal in LTE RoF System

T. Kanesan, S. M. Mitani, R. Mohamad, H. M. Hizan, W. P. Ng, Z. Ghassemlooy, Sujan Rajbhandari, Paul Antony Haigh, G.-K. Chang

Research output: Contribution to journalArticle

4 Citations (Scopus)
38 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)2481 - 2484
JournalIEEE Photonics Technology Letters
Issue number23
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Bibliographical note

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  • Long Term Evolution
  • nonlinear optics
  • optical communication equipment
  • optical fibre dispersion
  • optical modulation
  • radio-over-fibre
  • stimulated Brillouin scattering
  • DMFD
  • Gaussian signal shape
  • LTE RoF system
  • SBS
  • chromatic dispersion
  • degree of freedom
  • direct modulation-based frequency dithering
  • dithering signal shapes
  • frequency chirp
  • gain 8 dB
  • long-term evolution radio-over-fiber systems
  • multiple relay nodes
  • nonlinear compensator characteristic
  • nonlinear compensator signal
  • nonlinearity suppression
  • optical power budget improvement
  • optical source linewidth
  • optimum optical launch power region
  • saw signal shape
  • sinc signal shape
  • sine signal shape
  • spectral shape impact
  • spectral width characteristics
  • square signal shape
  • stimulated Brillouin scattering linewidth
  • Long Term Evolution (LTE)
  • Long term evolution (LTE)
  • Nonlinear Compensation
  • Optical OFDM (OOFDM)
  • Radio-over-fibre (RoF)
  • nonlinear compensation
  • optical OFDM (OOFDM)
  • radio-overfibre (RoF)
  • Fiber nonlinear optics
  • Optical distortion
  • Optical fibers
  • Optical scattering
  • Spectral shape


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