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Experimental evaluation of real-time sigma-delta radio over fiber system for fronthaul applications

Published online by Cambridge University Press:  09 September 2020

Muhammad Usman Hadi*
Department of Electronic Systems, Aalborg University, Aalborg, Denmark
Hyun Jung
DMC RAN, Nokia Bell Labs, SV, USA
Pier Andrea Traverso
Department of Electronic and Information Engineering, University of Bologna, Viale Risorgimento 2, Bologna, Italy
Giovanni Tartarini
Department of Electronic and Information Engineering, University of Bologna, Viale Risorgimento 2, Bologna, Italy
Author for correspondence: Muhammad Usman Hadi, E-mail:


Sigma-delta radio over fiber (ΣΔ-RoF) is an expedient technology for next-generation networks including 5G cloud/centralized radio access networks (C-RAN). In this article, we demonstrate a realistic experimental scenario for ΣΔ-RoF link targeting C-RAN fronthaul applications, by using baseband second-order 1-bit sigma-delta modulation (ΣΔ-M). The experimental set-up validates the LTE 20 MHz signals having modulation order of 256-quadrature amplitude modulation for a carrier frequency of 3 GHz, up to 10 km of standard single mode fiber. A detailed analysis of the ΣΔ-RoF system performance is reported by adjacent channel leakage ratio and error vector magnitude. Furthermore, an experimental study is evaluated where ΣΔ-RoF is compared with its counterparts. It is deduced that ΣΔ-RoF corroborates the present range of C-RAN fronthaul networks and can be a promising candidate for future mobile haul applications.

Microwave Photonics
Copyright © The Author(s), 2020. Published by Cambridge University Press in association with the European Microwave Association

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Ranaweera, C, Wong, E, Nirmalathas, A, Jayasundara, C and Lim, C (2018) 5 G C-RAN with optical fronthaul: an analysis from a deployment perspective. Journal of Lightwave Technology 36, 20592068.10.1109/JLT.2017.2782822CrossRefGoogle Scholar
China Mobile (2011) C-RAN the road towards green RAN (version 2.5), White Paper.Google Scholar
Masotti, D, Francia, P, Costanzo, A and Rizzoli, V (2013) Rigorous electromagnetic/circuit-level analysis of time-modulated linear arrays. IEEE Transactions on Antennas and Propagation 61, 54655474.10.1109/TAP.2013.2279217CrossRefGoogle Scholar
Aslam, N, Xia, K and Hadi, MU (2019) Optimal wireless charging inclusive of intellectual routing based on SARSA learning in renewable wireless sensor networks. IEEE Sensors Journal 19, 83408351, 15 Sept.15, 2019,10.1109/JSEN.2019.2918865CrossRefGoogle Scholar
Wang, W, So, HC and Farina, A (2017) An overview on time/frequency modulated array processing. IEEE Journal of Selected Topics in Signal Processing 11, 228246.10.1109/JSTSP.2016.2627182CrossRefGoogle Scholar
Khurshid, K, Khan, AA, Siddiqui, H, Rashid, I and Hadi, MU (2019) Big data assisted CRAN enabled 5 G SON architecture. Journal of ICT Research and Applications 13, 93106.10.5614/itbj.ict.res.appl.2019.13.2.1CrossRefGoogle Scholar
Wang, J, Yu, Z, Ying, K, Zhang, J, Lu, F, Xu, M, Cheng, L, Ma, X and Chang, G-K (2017) Digital mobile fronthaul based on delta-sigma modulation for 32 LTE carrier aggregation and FBMC signals. IEEE/OSA Journal of Optical Communications and Networking 9, A233A244.10.1364/JOCN.9.00A233CrossRefGoogle Scholar
Checko, A, Christiansen, HL, Yan, Y, Scolari, L, Kardaras, G, Berger, MS and Dittmann, L (2015) Cloud RAN for mobile networks – a technology overview. IEEE Communications Surveys & Tutorials 17, 405426.10.1109/COMST.2014.2355255CrossRefGoogle Scholar
Pizzinat, A, Chanclou, P, Saliou, F and Diallo, T (2015) Things you should know about fronthaul. IEEE Journal of Lightwave Technology 33, 10771083.10.1109/JLT.2014.2382872CrossRefGoogle Scholar
Hadi, MU (2019) Nonlinearities Diminution in 40 Gb/s 256 QAM Radio over Fiber Link via Machine Learning Method. 2019, 2019090031 (doi: 10.20944/preprints201909.0031.v1). Preprints 3, 17.Google Scholar
Visani, D, Okonkwo, CM, Shi, Y, Yang, H, van den Boom, HPA, Tartarini, G, Tangdiongga, E and Ton Koonen, AMJ (2011) 3×2N-QAM Constellation formats for DMT over 1-mm core diameter plastic optical fiber. IEEE Photonics Technology Letters 23, 768770.10.1109/LPT.2011.2134082CrossRefGoogle Scholar
Shi, Y, Visani, D, Okonkwo, CM, Shi, Y, Yang, H, van den Boom, HPA, Tartarini, G, Tangdiongga, E and Ton Koonen, AMJ (2011) First demonstration of HD video distribution over large-core POF employing UWB for in-home networks. 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, Los Angeles, CA, 2011, 1–3.CrossRefGoogle Scholar
Morant, M and Llorente, R (2019) Performance analysis of multiple radio-access provision in a multicore-fibre optical fronthaul. Optics Communications 436, 161167.CrossRefGoogle Scholar
Hadi, MU (2020) Digital Signal Processing Techniques Applied to Radio over Fiber Systems, (Dissertation thesis), Alma Mater Studiorum University of Bologna. PhD in Electronic Engineering, Telecommunications and Information Technologies, 32 Cycle. DOI 10.6092/unibo/amsdottorato/9155.Google Scholar
Hadi, MU, Nanni, J, Traverso, PA, Tartarini, G, Venard, O, Baudoin, G and Polleux, JL (2018) Experimental evaluation of digital predistortion for VCSEL-SSMF-based Radio-over-Fiber link, 2018 International Topical Meeting on Microwave Photonics (MWP), Toulouse, 2018, pp. 1–4, doi: 10.1109/MWP.2018.8552895.CrossRefGoogle Scholar
Meslener, G (1984) Chromatic dispersion induced distortion of modulated monochromatic light employing direct detection. IEEE Journal of Quantum Electronics 20, 12081216.10.1109/JQE.1984.1072286CrossRefGoogle Scholar
Kurniawan, T, Nirmalathas, A, Lim, C, Novak, D and Waterhouse, R (2006) Performance analysis of optimized millimeter-wave fiber radio links. IEEE Transactions on Microwave Theory and Techniques 54, 921928.10.1109/TMTT.2005.863047CrossRefGoogle Scholar
Castleford, D, Nirmalathas, A, Novak, D and Tucker, RS (2001) Optical crosstalk in fiber-radio WDM networks. IEEE Trans. Microwave Theory Techniques 49, 20302035.CrossRefGoogle Scholar
Mizuguti, H, Okuno, T, Komaki, S and Morinaga, N (1993) Performance analysis of optical fiber link for microcellular mobile communication systems. IEICE Transactions on Electronics E76–C, 271278.Google Scholar
Tartarini, G and Faccin, P (2005) Efficient characterization of harmonic and intermodulation distortion effects in dispersive radio over fiber systems with direct laser modulation. Microwave and Optical Technology Letters 46, 114117.10.1002/mop.20917CrossRefGoogle Scholar
Alcaro, G, Visani, D, Tarlazzi, L, Faccin, P and Tartarini, G (2012) Distortion mechanisms originating from modal noise in radio over multimode fiber links. IEEE Transactions on Microwave Theory and Techniques 60, 185194.10.1109/TMTT.2011.2171982CrossRefGoogle Scholar
Wang, J, Liu, C, Zhu, M, Yi, A, Cheng, L and Chang, GK (2014) Investigation of data-dependent channel cross-modulation in multiband radio-over-fiber systems. Journal of Lightwave Technology 32, 18611871.10.1109/JLT.2014.2311115CrossRefGoogle Scholar
Wang, J, Liu, C, Zhang, J, Zhu, M, Xu, M, Lu, F, Cheng, L and Chang, G-K (2016) Nonlinear inter-band subcarrier intermodulations of multi-RAT OFDM wireless services in 5 G heterogeneous mobile fronthaul networks. Journal of Lightwave Technology 34, 40894103.10.1109/JLT.2016.2584621CrossRefGoogle Scholar
Hadi, MU, Kantana, C, Traverso, PA, Tartarini, G, Venard, O, Baudoin, G and Polleux, JL (2020) Assessment of digital predistortion methods for DFB-SSMF radio-over-fiber links linearization. Microwave and Optical Technology Letters 62, 540546.CrossRefGoogle Scholar
Roselli, L, Borgioni, V, Zepparelli, F, Ambrosi, F, Comez, M, Faccin, P and Casini, A (2003) Analog laser predistortion for multiservice radio-over-fiber systems. IEEE Journal of Lightwave Technology 21, 12111223.10.1109/JLT.2003.810931CrossRefGoogle Scholar
Fuochi, F, Hadi, MU, Nanni, J, Traverso, PA and Tartarini, G (2016) Digital predistortion technique for the compensation of nonlinear effects in radio over fiber links, in 2016 IEEE 2nd International Forum on Research and Technologies for Society and Industry Leveraging a better tomorrow(RTSI), Bologna, 1–6.10.1109/RTSI.2016.7740562CrossRefGoogle Scholar
3GPP (2016) Base Station (BS) transmission and reception, Technical Specification ETSI TS136.104 V13.3.0, 2016.Google Scholar
Vieira, LC and Gomes, NJ (2015) Experimental demonstration of digital predistortion for orthogonal frequency division multiplexing-radio over fibre links near laser resonance. IET Optoelectronics 9, 310316.10.1049/iet-opt.2014.0160CrossRefGoogle Scholar
Hadi, MU, Traverso, PA, Tartarini, G, Venard, O, Baudoin, G and Polleux, JL (2019) Digital predistortion for linearity improvement of VCSELSSMF-based radio-over-fiber links. IEEE Microwave and Wireless Components Letters 29, 155157.CrossRefGoogle Scholar
Hadi, MU, Jung, H, Ghaffar, S, Traverso, PA and Tartarini, G (2019) Optimized digital radio over fiber system for medium range communication. Optics Communications, 443, 177185, ISSN 0030-4018,CrossRefGoogle Scholar
Lim, C, (Thas) Nirmalathas, A, Lee, K-L, Novak, D and Waterhouse, R (2007) Intermodulation distortion improvement for fiber–radio applications incorporating OSSB + C modulation in an optical integrated-access environment. Journal of Lightwave Technology 25, 16021612.10.1109/JLT.2007.896814CrossRefGoogle Scholar
Hadi, MU, Jung, H, Traverso, PA and Tartarini, G (2019) Digital radio frequency transport over optical fiber for 5 G fronthaul links, Journal of Optical Communications, (published online ahead of print 2019), doi:10.1515/joc-2019-0051.CrossRefGoogle Scholar
Common Public Radio Interface (CPRI) Specification: (2015) V7.0. Available at Scholar
Hadi, MU (2016) Extending the benefits of LTE to unlicensed spectrum, in 2015 International Conference on Information and Communication Technologies (ICICT), Karachi, 2015, pp. 13, doi:10.1109/ICICT.2015.7469592.CrossRefGoogle Scholar
Pessoa, LM, Tavares, JS, Coelho, D and Salgado, HM (2014) Experimental evaluation of a digitized fiber-wireless system employing sigma delta modulation. Optics Express 22, 1750817523.10.1364/OE.22.017508CrossRefGoogle ScholarPubMed
Breyne, L, Torfs, G, Yin, X, Demeester, P and Bauwelinck, J (2017) Comparison between analog radio-over-fiber and sigma delta modulated radio-over-fiber. IEEE Photonics Technology Letters 29, 18081811.10.1109/LPT.2017.2752284CrossRefGoogle Scholar
Sezgin, IC, Gustavsson, J, Lengyel, T, Eriksson, T, He, ZS and Fager, C (2019) Effect of VCSEL characteristics on ultra-high speed sigma-delta-over-fiber communication links. Journal of Lightwave Technology 9, 21092119.10.1109/JLT.2019.2898270CrossRefGoogle Scholar
Hadi, MU, Traverso, PA, Tartarini, G and Jung, H (2019) Experimental characterization of sigma delta radio over fiber system for 5 G C-RAN downlink. ICT Express 6, 2327, ISSN 2405-9595,CrossRefGoogle Scholar
Hadi, MU, Aslam, N and Jung, H (2019) Performance appraisal of sigma delta modulated radio over fiber system. Journal of Optical Communications. doi:10.1515/joc-2018-0227.CrossRefGoogle Scholar
Fouto, D and Paulino, N (2017) Design of Low Power and Low Area Passive Sigma Delta Modulators for Audio Applications. Switzerland: Springer Nature.CrossRefGoogle Scholar
Hossain, R and Pozsgay, A (2012) Parallel MASH ΔΣ modulator, US Patent US8203475B2 [Online] (Available: (2012).Google Scholar
Hadi, MU, Hadi, MU, Aslam, N, Ali, R, Khurshid, K, Traverso, PA and Tartarini, G (2019) Experimental demonstration of MASH based sigma delta radio over fiber system for 5 G C-RAN downlink. Journal of Optical Communications. doi:10.1515/joc-2019-0011.CrossRefGoogle Scholar
Hadi, MU, Nanni, J, Venard, O, Baudoin, G, Polleux, JL and Tartarini, G (2020) Practically feasible closed-loop digital predistortion for VCSEL-MMF-based radio-over-fiber links. Radioengineering 29, 3743.CrossRefGoogle Scholar
100GBASE-PSM4 QSFP28 Optical Transceiver Module for Ethernet and Data Center (SMF, 1310 nm, 500 m, MTP/MPO, DOM): datasheet. Available at Scholar
Hadi, MU, Nanni, J, Polleux, JL, Traverso, PA and Tartarini, G (2019) Direct digital predistortion technique for the compensation of laser chirp and fiber dispersion in long haul radio over fiber links. Optical and Quantum Electronics 51, 120. doi: 10.1007/s11082-019-1923-8.CrossRefGoogle Scholar