Article
Optimization of Optical Modulator for LTE RoF in Nonlinear Fiber Propagation
IEEE Photonics Technology Letters (Impact Factor: 2.04). 04/2012; 24(7):617619. DOI:10.1109/LPT.2012.2185927

Conference Proceeding: Impact of Optical Modulators in LTE RoF System with Nonlinear Compensator for Enhanced Power Budget
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ABSTRACT: Nonlinear propagation compensation for LTERoF system is experimentally demonstrated with proposed DMFD and EMFD methods. We discovered that the RoF dithering frequency requirement have to be much smaller with an average improvement of ~5.35 dB.IEEE/OSA OFC/NFOEC; 03/2013 
Conference Proceeding: Experimental Demonstration of the Compensation of Nonlinear Propagation in a LTE RoF system with a Directly Modulated Laser
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ABSTRACT: This paper reveals that nonlinear propagation is a critical problem for the long term evolution (LTE) technology based on the radiooverfibre (RoF) system. Therefore, a direct modulation based frequency dithering (DMFD) method is proposed for nonlinear propagation compensation, namely the self phase modulation (SPM) and stimulated brillouin scattering (SBS). We found that DMFD method operates substantially different in RoF systems. The major difference is that DMFD signal frequency fd has to be much smaller than the RoF carrier frequency fRF; thus the condition of {fd << fRF} has to be stringently obeyed. Analysis of the optical launch power (OLP) with DMFD method reveals that the SBS threshold is above ~6 dBm for LTERoF system. In addition, we also unfold that DMFD method does not induce an additional distortion for the linear and optimum OLP regions, which are frequency chirp dependent. Hence the proposed method improves the LTERoF system without any shortcoming. Finally, at OLP values of 8 dBm and 10 dBm, LTERoF system exhibits an average error vector magnitude (EVM) improvement of ~4.32% and ~6.18%, respectively, for the 50 km transmission span.IEEE ICC 2013; 06/2013  [show abstract] [hide abstract]
ABSTRACT: 1 Abstract—: We propose and experimentally demonstrate the design of seamless integration of the 3 rd generation partnership program (3GPP) long term evolution (LTE) with radiooverfibre (RoF) for the eNodeB (eNB) cell extension. The proposed system is optimized for all LTE analogue radio bandwidths (ARBs) namely, 3, 5, 10, 15 and 20 MHz. This letter presents the complete LTERoF system design with the optimum modulation region (OMR) and an optimum optical launch power (OLP). The resultant optimized error vector magnitude (EVM) for the 64quadrature amplitude modulation (QAM)orthogonal frequency division multiplexing (OFDM) modulation scheme across the aforementioned ARBs is ~0.99%, which is very much lower than the 8% margin defined by 3GPP.IEEE Photonics Technology Letters 12/2012; 24(24):22102213. · 2.04 Impact Factor
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