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Block transmission with linear frequency domain equalization for dispersive optical channels with direct detection

: Wolf, M.; Grobe, L.; Rieche, M.R.; Koher, A.; Vui, J.


Institute of Electrical and Electronics Engineers -IEEE-; Informationstechnische Gesellschaft -ITG-, Information Technology Society of VDE:
12th International Conference on Transparent Optical Networks, ICTON 2010. Proceedings : June 27 2010-July 1 2010, Munich, Germany
New York, NY: IEEE, 2010
ISBN: 978-1-4244-7799-9
ISBN: 978-1-4244-7797-5
Art. 5549129
International Conference on Transparent Optical Networks (ICTON) <12, 2010, Munich>
Fraunhofer HHI ()

Block transmission with frequency-domain equalization (FDE) has been proven as an attractive alternative to orthogonal frequency division multiplex (OFDM) for radio frequency (RF) communication, especially at 60 GHz. In this paper, we show that FDE can be advantageously applied for optical transmission over dispersive channels as well, and in particular, in direct-detection systems. We review the optimal coefficients for zero forcing (ZF) and minimum mean square error (MMSE) equalization - both in the case of symbol-spaced and fractionally-spaced sampling, and present promising results for an illustrative visible-light communications (VLC) link based on non-return-to-zero (NRZ) on-off keying (OOK).