Orthogonal Frequency Division Multiplexing for Spectrally Efficient Nyquist WDM Systems
Conference: OFDM 2014 - 18th International OFDM Workshop 2014 (InOWo'14)
08/27/0000 - 08/28/2014 at Essen, Deutschland
Proceedings: OFDM 2014
Pages: 4Language: englishTyp: PDF
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Authors:
Slim, Israa; Nossek, Josef A. (Institute for Circuit Theory and Signal Processing, Technische Universitaet Muenchen, Munich, Germany)
Xie, Changsong (European Research Center, Huawei Technologies Duesseldorf GmbH, Munich, Germany)
Abstract:
In order to meet the increasing demand on high data rate in the backbone optical networks, we choose offset QAM Nyquist Wavelength Division Multiplexing (OQAM N-WDM) as the technique to increase the spectral efficiency (SE) of fiber-optic WDM transmission systems. To get intersymbol interference (ISI)-free transmission, root-raisedcosine (RRC) pulses are used in the transmitter. To get interchannel interference (ICI) free transmission, OQAM is employed as modulation scheme enabling the multiplexing of the users’ channels with a spacing equal to the symbol rate and thus achieving the highest SE. The performance is evaluated for this system propagating over a linear chromatic dispersion (CD) channel. Simulation results show that the required optical SNR (ROSNR) at BER of 10-3 for backto- back connection of the transmitter and receiver meets the theoretical value of OSNR for QPSK transmission i.e. ROSNR = 13.3 dB.