Abstract
Conventional coherent optical orthogonal frequency-division multiplexed
(CO-OFDM) system has inferior nonlinear tolerance due to high peak-to-average
power ratio (PAPR). Discrete Fourier transform spread OFDM (DFTS-OFDM) has
recently been proposed as a promising candidate that possesses similar spectral
characteristics as conventional CO-OFDM, but has much better nonlinear tolerance.
We demonstrate experimentally the transmission of 1.0 Tb/s unique-word DFTS-OFDM
superchannel signal over 8000 km standard single-mode fiber with 80 km span
engineering and erbium-doped fiber amplification (EDFA) using quadrature phase
shift keying (QPSK) modulation, representing a record spectral efficiency
and reach product in transmission systems compatible with most of the deployed
links.
© 2012 IEEE
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