Article
Optimization of Optical Modulator for LTE RoF in Nonlinear Fiber Propagation
IEEE Photonics Technology Letters (Impact Factor: 2.18). 04/2012; 24(7):617619. DOI: 10.1109/LPT.2012.2185927

Conference Paper: 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 
Article: HighSpeed Bidirectional Optical Wireless System in NonDirected LineofSight Configuration
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ABSTRACT: We propose and experimentally demonstrate the first bidirectional optical wireless link operating in nondirect lineofsight (NdLOS). The system is based on visible light emitting diode (LED) for downlink and infrared LED for uplink. We achieve around 250 Mbit/s for both downstream and upstream transmission, with the ambient light noise of usual indoor illumination level (500 lx), produced by warmwhite LED. 100 Mbit/s are guaranteed inside 12 m $^{2}$ of a common room scenario, without LOS tracking. An optimized discrete multitone modulation gives biterrorratios always below of the common forwarderrorcorrection threshold of 1.5 ×10 $^{3}$ . These results indicate that this scheme has great potential for practical VLC system implementation.Journal of Lightwave Technology 05/2014; 32(10). · 2.86 Impact Factor 
Conference Paper: 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
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