DFT-based offset-QAM OFDM for optical communications
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TLDR
It is shown that offset-QAM OFDM exhibits negligible penalty for all investigated spectra, in contrast to rectangular- function based Nyquist FDM (N-FDM) and sinc-function based conventional OFDM (C-OFDM), and by avoiding the GI, 112-Gb/s polarization multiplexed offset-4QAM OfDM can achieve 23% increase in net data rate over C-OF DM under the same transmission reach.Abstract:
We experimentally demonstrate and numerically investigate a discrete-Fourier-transform (DFT) based offset quadrature-amplitude-modulation (offset-QAM) orthogonal frequency division multiplexing (OFDM) system. We investigate the scheme using a set of square-root-raised-cosine functions and a set of super-Gaussian functions as signal spectra. It is shown that offset-QAM OFDM exhibits negligible penalty for all investigated spectra, in contrast to rectangular-function based Nyquist FDM (N-FDM) and sinc-function based conventional OFDM (C-OFDM). The required guard interval (GI) length for dispersion compensation in offset-QAM OFDM is analyzed and shown to scale with twice the subcarrier spacing rather than the full OFDM bandwidth. Experimental results show that 38-Gb/s offset-16QAM OFDM supports 600-km fiber transmission with negligible penalty in the absence of GI while a GI length of eight is required in C-OFDM. Further numerical simulations show that by avoiding the GI, 112-Gb/s polarization multiplexed offset-4QAM OFDM can achieve 23% increase in net data rate over C-OFDM under the same transmission reach. We also discuss the design of the pulse-shaping filter in the DFT-based implementation and show that when compared to N-FDM, the required memory length of the filter for pulse shaping can be reduced from 60 to 2 in offset-QAM OFDM regardless of the fiber length.read more
Citations
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Channel estimation in DFT-based offset-QAM OFDM systems
TL;DR: It is theoretically and experimentally shown that simple channel estimation can be realized in offset-QAM OFDM with the achieved performance close to the theoretical limit and this technology very promising for optical communication systems.
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References
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Analysis and design of OFDM/OQAM systems based on filterbank theory
TL;DR: A discrete-time analysis of the orthogonal frequency division multiplex/offset QAM (OFDM/OQAM) multicarrier modulation technique, leading to a modulated transmultiplexer, is presented.
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Performance of an Efficient Parallel Data Transmission System
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26 Tbit s-1 line-rate super-channel transmission utilizing all-optical fast Fourier transform processing
David Hillerkuss,Rene Schmogrow,T. Schellinger,M. Jordan,M. Winter,G. Huber,Thomas Vallaitis,Rene Bonk,P. Kleinow,F. Frey,M. Roeger,S. Koenig,A. Ludwig,A. Marculescu,Jingshi Li,M. Hoh,M. Dreschmann,J. Meyer,S. Ben Ezra,N. Narkiss,Bernd Nebendahl,Francesca Parmigiani,Periklis Petropoulos,Bojan Resan,Andreas Oehler,Kurt J. Weingarten,T. Ellermeyer,J. Lutz,M. Moeller,Michael Huebner,Jürgen Becker,Christian Koos,Wolfgang Freude,Juerg Leuthold +33 more
TL;DR: An optical fast Fourier transform scheme is demonstrated that provides the necessary computing power to encode lower-bitrate tributaries into 10.8 and 26.0 Tbit s-1 line-rate orthogonal frequency division multiplexing (OFDM) data streams and to decode them from fibre-transmitted OFDM data streams.
Journal ArticleDOI
Performance Limits of Nyquist-WDM and CO-OFDM in High-Speed PM-QPSK Systems
TL;DR: The two techniques for generating polarization-multiplexed quadrature phase-shift keying with a high spectral efficiency have the same sensitivity and SE under idealized assumptions, but it is found that CO-OFDM requires a much larger receiver bandwidth and proportionally faster speed of the analog-to-digital converters.
Journal ArticleDOI
448-Gb/s Reduced-Guard-Interval CO-OFDM Transmission Over 2000 km of Ultra-Large-Area Fiber and Five 80-GHz-Grid ROADMs
Xiang Liu,Sethumadhavan Chandrasekhar,Benyuan Zhu,Peter J. Winzer,Alan H. Gnauck,D. W. Peckham +5 more
TL;DR: In this paper, a coherent optical orthogonal frequency-division multiplexing (CO-OFDM) scheme with reduced guard interval (RGI) was proposed for high-speed high-spectral-efficiency long-haul optical transmission.