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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 optical fiber communication systems

  • Digital signal processing and channel modeling for optical communication and networks

  • Capacity estimation and maximization in optical fiber networks

Selected Publications

  1. T Xu, G Jacobsen, S Popov, J Li, T Liu, Y Zhang, “Analytical investigations on carrier phase recovery in dispersion-unmanaged n-PSK coherent optical communication systems,” [MDPI] Photonics, Vol.3(4), 51, 2016.
  2. T Xu, G Jacobsen, S Popov, T Liu, Y Zhang, P Bayvel, “Analytical estimation in differential optical transmission systems influenced by equalization enhanced phase noise,” Progress in Electromagnetics Research Symposium (PIERS), 160229122623, 2016. (Invited)
  3. T Xu, G Jacobsen, S Popov, J Li, T Liu, Y Zhang, “Close-form expression of one-tap normalized LMS carrier phase recovery in optical communication systems,” [SPIE] International Conference on Wireless and Optical Communications (ICWOC), Vol.9902, 990203, 2016. (Invited)
  4. T Xu, T Liu, Y Zhang, G Jacobsen, J Li, S Popov, “Digital adaptive carrier phase estimation in multi-level phase shift keying coherent optical communication systems,” [IEEE] International Conference on Information Science and Control Engineering (ICISCE), 1293-1297, 2016.
  5. T Xu, G Liga, D Lavery, B C Thomson, S J Savory, R I Killey, P Bayvel, “Equalization enhanced phase noise in Nyquist-spaced superchannel transmission systems using multi-channel digital back-propagation,” [Nature] Scientific Reports, Vol.5, 13990, 2015.
  6. R Maher, T Xu, L Galdino, M Sato, A Alvarado, K Shi, S J Savory, B C Thomsen, R I Killey, P Bayvel, “Spectrally shaped DP-16QAM super-channel transmission with multi-channel digital back propagation,” [Nature] Scientific Reports, Vol.5, 08214, 2015.
  7. T Xu, J Li, G Jacobsen, S Popov, A Djupsjöbacka, R Schatz, Y Zhang, P Bayvel, “Field trial over 820 km installed SSMF and its potential Terabit/s superchannel application with up to 57.5-Gbaud DP-QPSK transmission,” [Elsevier] Optics Communications, Vol.353, 133-138, 2015.
  8. T Xu, G Jacobsen, S Popov, J Li, S Sergeyev, A T. Friberg, Y Zhang, “Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise,” [Elsevier] Optics Communications, Vol.334, 222-227, 2015.
  9. T Xu, G Liga, N A Shevchenko, R I Killey, P Bayvel, “Receiver-based strategies for mitigating nonlinear distortion in high-speed optical communication systems,” Tyrrhenian International Workshop on Digital Communications, [IEEE/OSA] Photonics in Switching, P2.2, 2015. (Invited)
  10. T Xu, G Liga, N A Shevchenko, A Alvarado, M E McCarthy, S T Le, A D Ellis, R I Killey, S K Turitsyn, P Bayvel, “Overcoming fibre nonlinearities to enhance the achievable transmission rates in optical communication systems,” [IEEE/OSA] Asia Communications and Photonics Conference, Workshop 3, 2015. (Invited)
  11. T Xu, G Jacobsen, S Popov, J Li, A T Friberg, Y Zhang, “Carrier phase estimation methods in coherent transmission systems influenced by equalization enhanced phase noise,” [Elsevier] Optics Communications, Vol.293, 54-60, 2013.
  12. T Xu, J Li, A Djupsjöbacka, R Schatz, G Jacobsen, S Popov, “Quasi real-time 230-Gbit/s coherent transmission field trial over 820 km SSMF using 57.5-Gbaud dual-polarization QPSK,” [IEEE] Asia Communications and Photonics Conference (ACP), AF1F.3, 2013.
  13. T Xu, G Jacobsen, S Popov, J Li, S Sergeyev, “Mitigation of EEPN in long-haul n-PSK coherent transmission system using modified optical pilot carrier,” [IEEE] Asia Communications and Photonics Conference (ACP), AF3E.1, 2013.
  14. T Xu, G Jacobsen, S Popov, J Li, S Sergeyev, Y Zhang, “Analysis of carrier phase extraction methods in 112-Gbit/s NRZ-PDM-QPSK coherent transmission system,” [IEEE] Asia Communications and Photonics Conference (ACP), AS1C.2, 2012.
  15. T Xu, G Jacobsen, S Popov, J Li, S Sergeyev, Y Zhang, “Influence of digital dispersion equalization on phase noise enhancement in coherent optical system,” [IEEE] Asia Communications and Photonics Conference (ACP), AS1C.3, 2012.
  16. T Xu, G Jacobsen, S Popov, J Li, A T. Friberg, Y Zhang, “Analytical estimation of phase noise influence in coherent transmission system with digital dispersion equalization,” [OSA] Optics Express, Vol.19(8), 7756-7768, 2011.
  17. T Xu, G Jacobsen, S Popov, M Forzati, J Mårtensson, M Mussolin, J Li, K Wang, Y 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.
  18. T Xu, G Jacobsen, S Popov, J Li, A T. Friberg, Y Zhang, “Phase noise mitigation in coherent transmission system using a pilot carrier,” [IEEE] Asia Communications and Photonics Conference (ACP), Vol. 8309, 8309Z, 2011.
  19. T Xu, G Jacobsen, S Popov, J Li, E Vanin, K Wang, A T Friberg, Y Zhang, “Chromatic dispersion compensation in coherent transmission system using digital filters,” [OSA] Optics Express, Vol.18(15), 16243-16257, 2010.
  20. T Xu, G Jacobsen, S Popov, J Li, K Wang, A T Friberg, “Normalized LMS digital filter for chromatic dispersion equalization in 112-Gbit/s PDM-QPSK coherent optical transmission system,” [Elsevier] Optics Communications, Vol.283, 963-967, 2010.
  21. T Xu, W Jing, H Zhang, K Liu, D Jia, Y Zhang, “Influence of birefringence dispersion on a distributed stress sensor using birefringent optical fiber,” [Elsevier] Optical Fiber Technology, Vol.15, 83-89, 2009.
  22. T Xu, F Tang, W Jing, H Zhang, D Jia, X Zhang, G Zhou, Y Zhang, “Distributed measurement of mode coupling in birefringent fibers with random polarization modes,” Optica Applicata, Vol.XXXIX(1), 77-90, 2009.
  23. T Xu, G Jacobsen, S Popov, J Li, K Wang, A T Friberg, “Digital compensation of chromatic dispersion in 112-Gbit/s PDM-QPSK system,” [IEEE] Asia Communications and Photonics Conference (ACP), Vol.7632, 763202, 2009.
  24. T Xu, G Jacobsen, S Popov, J Li, K Wang, A T Friberg, “Variable-step-size LMS adaptive filter for digital chromatic dispersion compensation in PDM-QPSK coherent transmission system,” [SPIE] International Conference on Optical Instruments and Technology (OIT), Vol. 7506, 75062I, 2009.
  25. T Xu, W Jing, F Tang, H Zhang, D Jia, C Yu, G Zhou, Y Zhang, “Influence of polarization extinction ratio on distributed polarization coupling detection,” [Springer] Optoelectronics Letters, Vol.4(4), 0292-0294, 2008.
  26. T Xu, C Jing, W Jing, H Zhang, D Jia, Y Zhang, “Design and experiment of electronic speckle shearing phase-shifting pattern interferometer,” [Springer] Optoelectronics Letters, Vol.4(1), 59-61, 2008.
  27. T Xu, W Jing, H Zhang, C Huang, K Liu, D Jia, Y Zhang, “Influence of birefringence dispersion on spatial resolution of a distributed stress sensor using birefringence optical fiber,” [SPIE] Photonics Asia Conference (PA), Vol.6829, 68290X, 2007.
  28. T Xu, T Liu, W Jing, D Jia, L Liu, “Structures for enhancing fiber Bragg grating pressure sensitivity,” Modern Instruments, Vol.4, 4-7, 2005.

Funding

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