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Research and Teaching in the Institute for Telecommunications at TUM (Norbert Hanik)

Very high data rate transmission in optical communications: Simulation and analytical   evaluation of the system performance (Tobias Fehenberger)

Time:  15 MAY 2012 @ 13:00

Room:  NW710

Abstract:

The nonlinear transmission performance of quasi-Nyquist wavelength-division multiplexing and reduced guard interval orthogonal frequency-division multiplexing using differential PDM-QPSK and differential PDM-QAM-16 with high spectral densities have been compared by simulations and analytically. Nyquist-like WDM was simulated by an RRC filter with very small roll-off factor, leading to an almost rectangular spectrum. The results show that both systems are able to reach similar maximum transmission distances of approximately 6700km, 2600km and 1100km over standard single-mode fibre for the spectral efficiencies of 3.43 bits/s/Hz, 5.25 bits/s/Hz and 7 bits/s/Hz respectively.
However, timing synchronisation was considered ideal in the simulations. Especially for Nyquist-pulses having a small horizontal eye opening, the practical realisation of this aspect is expected to be challenging in terms of design and potentially mitigate the system performance.