Abstract
We experimentally demonstrated transmitting 40 × 117.6 Gb/s 16
quadrature amplitude modulation with orthogonal frequency division multiplexing
modulation over 10 181 km. The following techniques are applied to achieve error-free
transmission: 1) hybrid large-core/ultralow-loss fibers were used for improving received
optical signal-to-noise ratio while enhancing fiber nonlinearity tolerance; 2) multiband
nonlinearity compensation algorithm was performed to further improve nonlinearity
tolerance; 3) the forward error correction (FEC) limit of 5.3 dB provided by the
concatenation of hard-decision and soft-decision FEC codes ensures to have error-free
transmission after turbo equalizer with memory of three symbols, thus attaining a
spectral efficiency of 4.7 b/s/Hz.
© 2012 IEEE
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