Title :
Offset-QAM multicarrier technology for optical systems and networks (Invited)
Author_Institution :
Photonic Syst. Group, Tyndall Nat. Inst. & Univ. Coll. Cork, Cork, Ireland
Abstract :
In this paper, we review the multicarrier technology using offset quadrature amplitude modulation (QAM) for optical communication systems and networks. We investigate the orthogonality condition of this technology and discuss its electronic and optical domain implementation. It is shown that discrete-Fourier-transform based offset-QAM orthogonal frequency division multiplexing (OFDM) can greatly relax the required length of guard interval for dispersion compensation compared to conventional OFDM, and reduce the implementation complexity compared to Nyquist FDM. Optically-multiplexed offset-QAM super-channels exhibit improved performance, and relaxed device specifications for minimizing inter-channel crosstalk compared to all-optical OFDM and Nyquist WDM.
Keywords :
OFDM modulation; discrete Fourier transforms; optical crosstalk; optical fibre dispersion; optical fibre networks; optical modulation; quadrature amplitude modulation; Nyquist FDM; OFDM; discrete-Fourier-transform; dispersion compensation; inter-channel crosstalk; offset quadrature amplitude modulation; offset-QAM multicarrier technology; optical communication systems; optical domain implementation; orthogonal frequency division multiplexing; Finite impulse response filters; OFDM; Optical crosstalk; Optical filters; Optical noise; Optical receivers; Optical transmitters; Coherent detection; Multicarrier; Offset quadrature amplitude modulation;
Conference_Titel :
Optical Communications and Networks (ICOCN), 2014 13th International Conference on
Conference_Location :
Suzhou
DOI :
10.1109/ICOCN.2014.6987059
