Limits of information spectral efficiency and transmission reach are analyzed by an optical orthogonal frequency- division- multiplexing (O-OFDM) dense wavelength- division- multiplexed (DWDM) system with bit rates of 10-600 Gb/s and quadrature phase-shift keying (QPSK) or m -quadrature amplitude modulation ( m -QAM). In addition, using the International Telecommunication Union (ITU) 50-GHz grid transmission of OFDM superchannels is studied.
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Klekamp et al. (2011) studied this question.
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