TY - JOUR

T1 - Spectral Shape Impact of Nonlinear Compensator Signal in LTE RoF System

AU - Kanesan, T.

AU - Mitani, S. M.

AU - Mohamad, R.

AU - Hizan, H. M.

AU - Ng, W. P.

AU - Ghassemlooy, Z.

AU - Rajbhandari, Sujan

AU - Haigh, Paul Antony

AU - Chang, G.-K.

N1 - “© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.”

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

AB - 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.

KW - Long Term Evolution

KW - nonlinear optics

KW - optical communication equipment

KW - optical fibre dispersion

KW - optical modulation

KW - radio-over-fibre

KW - stimulated Brillouin scattering

KW - DMFD

KW - Gaussian signal shape

KW - LTE RoF system

KW - SBS

KW - chromatic dispersion

KW - degree of freedom

KW - direct modulation-based frequency dithering

KW - dithering signal shapes

KW - frequency chirp

KW - gain 8 dB

KW - long-term evolution radio-over-fiber systems

KW - multiple relay nodes

KW - nonlinear compensator characteristic

KW - nonlinear compensator signal

KW - nonlinearity suppression

KW - optical power budget improvement

KW - optical source linewidth

KW - optimum optical launch power region

KW - saw signal shape

KW - sinc signal shape

KW - sine signal shape

KW - spectral shape impact

KW - spectral width characteristics

KW - square signal shape

KW - stimulated Brillouin scattering linewidth

KW - Long Term Evolution (LTE)

KW - Long term evolution (LTE)

KW - Nonlinear Compensation

KW - Optical OFDM (OOFDM)

KW - Radio-over-fibre (RoF)

KW - nonlinear compensation

KW - optical OFDM (OOFDM)

KW - radio-overfibre (RoF)

KW - Fiber nonlinear optics

KW - Optical distortion

KW - Optical fibers

KW - Optical scattering

KW - Spectral shape

U2 - 10.1109/LPT.2015.2462122

DO - 10.1109/LPT.2015.2462122

M3 - Article

VL - 27

SP - 2481

EP - 2484

JO - IEEE Photonics Technology Letters

JF - IEEE Photonics Technology Letters

SN - 1041-1135

IS - 23

ER -