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Tianhua Xu

Tianhua XuBiography

Tianhua Xu received his B.Eng. degree in Optoelectronic Information Engineering from Tianjin University, China, in 2005. Between 2005 and 2008, he undertook his MSc and PhD degrees in Optical Engineering at Tianjin University, both of which were awarded in 2011. From 2008 to 2012, he took a second PhD degree in Microelectronics and Applied Physics, at the Royal Institute of Technology (KTH), Sweden, obtaining his PhD in June 2012. Following this, he worked as a Postdoctoral Researcher at KTH, and a visiting Postdoctoral Researcher at the Technical University of Denmark (DTU). His research work was in the field of optical fibre communications and digital signal processing in coherent receivers.

In July 2013, Dr Xu joined the Optical Networks Group (ONG) at University College London (UCL) as a Senior Research Associate. His current research work is focused on the investigation of nonlinear channel capacity in optical fibre communication systems. He has authored / co-authored over 40 papers in peer-reviewed journals and conferences.

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Current Research Interests

  • High speed coherent optical fibre transmission system
  • Digital signal processing for compensating system impairments
  • Transmission capacity in nonlinear fibre channel


Selected Publications

  1. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Ari T. Friberg, Yimo Zhang, Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise, Optics Communications, Vol.293, 54-60, 2013.
  2. Gunnar Jacobsen, Tianhua Xu, Sergei Popov, Sergey Sergeyev, Study of EEPN mitigation using modified RF pilot and Viterbi-Viterbi based phase noise compensation, Optics Express, Vol.21(10), 12351-12362, 2013.
  3. Tianhua Xu, Jie Li, Anders Djupsjöbacka, Richard Schatz, Gunnar Jacobsen, Sergei Popov, Quasi real-time 230-Gbit/s coherent transmission field trial over 820 km SSMF using 57.5-Gbaud dual-polarization QPSK, Asia Communications and Photonics Conference, AF1F.3, 2013.
  4. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Sergey Sergeyev, Mitigation of EEPN in long-haul n-PSK coherent transmission system using modified optical pilot carrier, Asia Communications and Photonics Conference, AF3E.1, 2013.
  5. Hongxia Zhang, Shu Wang, Yuhan Gong, Tiegen Liu, Tianhua Xu, Dagong Jia, Yimo Zhang, A quantitative robustness evaluation model for optical fiber sensor networks, Journal of Lightwave Technology, Vol.31, 1240-1246, 2013.
  6. Gunnar Jacobsen, Tianhua Xu, Sergei Popov, Jie Li, Ari T. Friberg, Yimo Zhang, EEPN and CD study for coherent optical nPSK and nQAM systems with RF pilot based phase noise compensation, Optics Express, Vol.20(8), 8862-8870, 2012.
  7. Gunnar Jacobsen, Tianhua Xu, Sergei Popov, Jie Li, Ari T. Friberg, Yimo Zhang, Phase noise influence in coherent optical OFDM systems with RF pilot tone: IFFT multiplexing and FFT demodulation, Journal of Optical Communications, Vol.33(3), 217-226, 2012.
  8. Gunnar Jacobsen, Tianhua Xu, Sergei Popov, Sergey Sergeyev, Yimo Zhang, Phase noise influence in long-range coherent optical OFDM systems with delay detection: IFFT multiplexing and FFT demodulation, Journal of Optical Communications, Vol.33(4), 289-295, 2012.
  9. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Sergey Sergeyev, Yimo Zhang, Analysis of carrier phase extraction methods in 112-Gbit/s NRZ-PDM-QPSK coherent transmission system, Asia Communications and Photonics Conference, AS1C.2, 2012.
  10. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Sergey Sergeyev, Yimo Zhang, Influence of digital dispersion equalization on phase noise enhancement in coherent optical system, Asia Communications and Photonics Conference, AS1C.3, 2012.
  11. Gunnar Jacobsen, Tianhua Xu, Sergei Popov, Jie Li, Ari T. Friberg, Yimo Zhang, Receiver implemented RF pilot tone phase noise mitigation in coherent optical nPSK and nQAM systems, Optics Express, Vol.19(15), 14487-14494, 2011.
  12. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Ari T. Friberg, Yimo Zhang, Analytical estimation of phase noise influence in coherent transmission system with digital dispersion equalization, Optics Express, Vol.19(8), 7756-7768, 2011.
  13. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Marco Forzati, Jonas Mårtensson, Marco Mussolin, Jie Li, Ke Wang, Yimo Zhang, A. T. Friberg, Frequency-domain chromatic dispersion equalization using overlap-add methods in coherent optical system, Journal of Optical Communications, Vol.32(2), 131-135, 2011.
  14. Gunnar Jacobsen, Tianhua Xu, Sergei Popov, Jie Li, Yimo Zhang, Ari T. Friberg, Error-rate floors in differential n-level phase-shift-keying coherent receivers employing electronic dispersion equalization, Journal of Optical Communications, Vol.32(3), 191-193, 2011.
  15. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Ari T. Friberg, Yimo Zhang, Phase noise mitigation in coherent transmission system using a pilot carrier, Asia Communications and Photonics Conference, Proceedings of SPIE, Vol. 8309, 8309Z, 2011.
  16. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Evgeny Vanin, Ke Wang, Ari T. Friberg, Yimo Zhang, Chromatic dispersion compensation in coherent transmission system using digital filters, Optics Express, Vol.18(15), 16243-16257, 2010.
  17. Tianhua Xu, Gunnar Jacobsen, Sergei Popov, Jie Li, Ke Wang, Ari T. Friberg, Normalized LMS digital filter for chromatic dispersion equalization in 112-Gbit/s PDM-QPSK coherent optical transmission system, Optics Communications, Vol.283(6), 963-967, 2010.
  18. Tianhua Xu, Wencai Jing, Hongxia Zhang, Kun Liu, Dagong Jia, Yimo Zhang, Influence of birefringence dispersion on a distributed stress sensor using birefringent optical fiber, Optical Fiber Technology, Vol.15, 83-89, 2009.
  19. Tianhua Xu, Feng Tang, Wencai Jing, Hongxia Zhang, Dagong Jia, Xuemin Zhang, Ge Zhou, Yimo Zhang, Distributed measurement of mode coupling in birefringent fibers with random polarization modes, Optica Applicata, Vol.XXXIX(1), 77-90, 2009.
  20. Tianhua Xu, Wencai Jing, Feng Tang, Hongxia Zhang, Dagong Jia, Changsong Yu, Ge Zhou, Yimo Zhang, Influence of polarization extinction ratio of distributed polarization coupling detection, Optoelectronics Letters, Vol.4(4), 0292-0294, 2008.


Funding

Dr Xu is funded by the Engineering and Physical Sciences Research Council (EPSRC).