Equalisation of Measured Optical MIMO Channels

André Sandmann, Andreas Ahrens, Steffen Lochmann

2014

Abstract

Within the last years multiple-input multiple-output (MIMO) transmission has reached a lot of attention in the optical fibre community. Theoretically, the concept of MIMO is well understood. However, practical implementations of optical components are in the focus of interest for further computer simulations. That’s why in this contribution the specific impulse responses of the (2×2) MIMO channel, including a 1.4 km multi-mode fibre and optical couplers at both ends, are measured for operating wavelengths of 1326 nm and 1576 nm. Since semiconductor diode lasers, capable of working at different wavelengths, are used for the characterization of the underlying optical MIMO channel, inverse filtering is needed for obtaining the respective impulse responses. However, the process of inverse filtering also known as signal deconvolution is critical in noisy environments. That’s why different approaches such as Wiener and parametric filtering are studied with respect to different optimization criteria. Using these obtained impulse responses a baseband MIMO data transmission is modelled. In order to create orthogonal channels enabling a successful transmission, a MIMO zero forcing (ZF) equaliser is implemented and analysed. Our main results given as an open eye-diagram and calculated bit-error rates show the successful implementation of the MIMO transmission system.

References

  1. Ahrens, A. and Lochmann, S. (2013). Optical Couplers in Multimode MIMO Transmission Systems: Measurement Results and Performance Analysis. In International Conference on Optical Communication Systems (OPTICS), pages 398-403, Reykjavik (Iceland).
  2. Ahrens, A., Schröder, A., and Lochmann, S. (2013). Dispersion Analysis within a Measured 1,4 km MIMO Multimode Channel. In International Conference on Optical Communication Systems (OPTICS), pages 391- 397, Reykjavik (Island).
  3. Gans, W. L. (1986). Calibration and Error Analysis of a Picosecond Pulse Waveform Measurement System at NBS. Proceedings of the IEEE, 74(1):86-90.
  4. Köhnke, H., Schwinkendorf, R., Daase, S., Ahrens, A., and Lochmann, S. (2014). Receiver Design for an Optical MIMO Testbed. In International Conference on Optical Communication Systems (OPTICS), Vienna (Austria).
  5. Kühn, V. (2006). Wireless Communications over MIMO Channels - Applications to CDMA and Multiple Antenna Systems. Wiley, Chichester.
  6. Nahman, N. S. and Guillaume, M. E. (1981). Deconvolution of Time Domain Waveforms in the Presence of Noise. National Bureau of Standards Technical Note 1047, Boulder, Colorado 80303.
  7. Raleigh, G. G. and Cioffi, J. M. (1998). Spatio-Temporal Coding for Wireless Communication. IEEE Transactions on Communications, 46(3):357-366.
  8. Raleigh, G. G. and Jones, V. K. (1999). Multivariate Modulation and Coding for Wireless Communication. IEEE Journal on Selected Areas in Communications, 17(5):851-866.
  9. Richardson, D. J., Fini, J., and Nelson, L. (2013). Space Division Multiplexing in Optical Fibres. Nature Photonics, 7:354-362.
  10. Sandmann, A., Ahrens, A., and Lochmann, S. (2013). Signal Deconvolution of Measured Optical MIMOChannels. In XV International PhD Workshop OWD 2013, pages 278-283, Wisa, Poland.
  11. Sandmann, A., Ahrens, A., and Lochmann, S. (2014). Experimental Description of Multimode MIMO Channels utilizing Optical Couplers. In 15. ITGFachtagung Photonische Netze, Leipzig (Germany).
  12. Singer, A. C., Shanbhag, N. R., and Bae, H.-M. (2008). Electronic Dispersion Compensation- An Overwiew of Optical Communications Systems. IEEE Signal Processing Magazine, 25(6):110-130.
  13. Tse, D. and Viswanath, P. (2005). Fundamentals of Wireless Communication. Cambridge, New York.
  14. Vaseghi, S. (2000). Advanced Digital Signal Processing and Noise Reduction, Second Edition. John Wiley & Sons Ltd, Chichester.
  15. Winzer, P. (2012). Optical Networking beyond WDM. IEEE Photonics Journal, 4:647-651.
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Paper Citation


in Harvard Style

Sandmann A., Ahrens A. and Lochmann S. (2014). Equalisation of Measured Optical MIMO Channels . In Proceedings of the 5th International Conference on Optical Communication Systems - Volume 1: OPTICS, (ICETE 2014) ISBN 978-989-758-044-4, pages 37-44. DOI: 10.5220/0005019600370044


in Bibtex Style

@conference{optics14,
author={André Sandmann and Andreas Ahrens and Steffen Lochmann},
title={Equalisation of Measured Optical MIMO Channels},
booktitle={Proceedings of the 5th International Conference on Optical Communication Systems - Volume 1: OPTICS, (ICETE 2014)},
year={2014},
pages={37-44},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005019600370044},
isbn={978-989-758-044-4},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 5th International Conference on Optical Communication Systems - Volume 1: OPTICS, (ICETE 2014)
TI - Equalisation of Measured Optical MIMO Channels
SN - 978-989-758-044-4
AU - Sandmann A.
AU - Ahrens A.
AU - Lochmann S.
PY - 2014
SP - 37
EP - 44
DO - 10.5220/0005019600370044