Abstract
We generate a single-carrier 21.4-Gbaud polarization-division-multiplexed
(PDM) 64-ary quadrature-amplitude-modulated (QAM) signal (256.8-Gb/s line
rate) using a single in-phase/quadrature (I/Q) optical modulator driven by
8-level electrical waveforms from a novel high-power digital-to-analog
converter (DAC). We measure a required optical signal-to-noise ratio of 29.5
dB (0.1-nm reference bandwidth; $10<sup>-3</sup> bit-error rate), 4.6-dB off the theoretical limit. Using
ultra-large-area fiber, we achieve 400-km single-channel transmission. The
DAC was also used to obtain excellent results with
quadrature-phase-shift-keyed and 16-QAM signals at 21.4 Gbaud.
© 2011 IEEE
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