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Reductions of peak-to-average power ratio and optical beat interference in cost-effective OFDMA-PONs |
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| Authors: | A. Tsokanos E. Giacoumidis G. Zardas A. Kavatzikidis N. P. Diamantopoulos I. Aldaya I. Tomkos |
| Affiliation: | 1. Faculty of Science and Technology, School of Computing and Mathematics, Plymouth University, Drake Circus, Plymouth, PL4 8AA, UK 2. Athens Information Technology (AIT) Center, 19.5km Markopoulo Ave., 19002, Peania, Athens, Greece 3. Département Communications & électronique, Telecom Paris-Tech, 46 rue Barrault, 75013, Paris, France 7. Department of Informatics, Technological Educational Institute (TEI) of Lamia, 3rd Km Old National Road Lamia-Athens, C.P.?35100?, Lamia, Greece 4. iKnowHow S.A., Lefkados 3, Glyka Nera, Athens, Attica, Greece 5. School of Engineering and Applied Science, Aston University, Aston Triangle, Birmingham, B4 7ET, UK 6. Graduate School of Engineering, Osaka University, 1-1 Yamadaoka, Suita, Osaka, 565-0871, Japan |
| Abstract: | The peak-to-average power ratio (PAPR) and optical beat interference (OBI) effects are examined thoroughly in orthogonal frequency-division multiplexing access (OFDMA)-passive optical networks (PONs) at a signal bit rate up to $sim 20,mathrm{{Gb}}/{hbox {s}}$ per channel using cost-effective intensity-modulation and direct-detection (IM/DD). Single-channel OOFDM and upstream multichannel OFDM-PONs are investigated for up to six users. A number of techniques for mitigating the PAPR and OBI effects are presented and evaluated including adaptive-loading algorithms such as bit/power-loading, clipping for PAPR reduction, and thermal detuning (TD) for the OBI suppression. It is shown that the bit-loading algorithm is a very efficient PAPR reduction technique by reducing it at about 1.2 dB over 100 Km of transmission. It is also revealed that the optimum method for suppressing the OBI is the TD + bit-loading. For a targeted BER of $1 times 10 ^{-3}$ , the minimum allowed channel spacing is 11 GHz when employing six users. |
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