Investigation of Optical Modulators in Optimized Nonlinear Compensated LTE RoF System

Kanesan, Thavamaran, Ng, Wai Pang, Ghassemlooy, Zabih and Lu, Chao (2014) Investigation of Optical Modulators in Optimized Nonlinear Compensated LTE RoF System. Journal of Lightwave Technology, 32 (10). pp. 1944-1950. ISSN 0733-8724

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In this paper, we investigate a nonlinear compensation technique with two different architectures using direct modulation (DM) and external modulation (EM) techniques, termed as DM based frequency dithering (DMFD) and EM based frequency dithering (EMFD). We show that DMFD and EMFD methods operate substantially different in radio-over-fiber (RoF) system by optimizing the dithering technique relative to the LTE technology. The proposed techniques is only applicable if the condition of {fL < fd < fRF} is met, where fL represents the dithering boundary limit of 14 MHz, fd is DMFD signal frequency and fRF is the RoF carrier frequency. Analysis of the optical launch power for DMFD and EMFD methods reveal that the stimulated Brillouin scattering (SBS) threshold is above ~6 dBm for the LTE-RoF system. In addition, we also unveil that DMFD and EMFD methods do not introduce additional distortion for the linear and optimum optical launch power regions, which are frequency chirp driven regions. If the given condition is met, the proposed method improves the LTE-RoF system without any shortcoming. Finally, at 10 dBm launch power, DMFD and EMFD methods exhibits an average signal-to-noise ratio (SNR) gain of ~5.95 dB and ~7.71 dB, respectively.

Item Type: Article
Additional Information: © 2014 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.
Uncontrolled Keywords: Long term evolution (LTE), nonlinear compensation, optical OFDM (OOFDM), radio-over-fiber (RoF)
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Dr Wai Pang Ng
Date Deposited: 28 Sep 2015 08:55
Last Modified: 01 Aug 2021 07:03

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