Abstract
We discuss the generation, wavelength-division-multiplexed (WDM) long-haul
transmission, and coherent detection of 224-Gb/s polarization-division-multiplexed (PDM)
16-ary quadrature amplitude modulation (16-QAM) at a line rate of 28 Gbaud. We measure a
required optical signal-to-noise ratio of 23.4 dB (0.1-nm reference bandwidth; $10^{-
3}$ bit-error ratio), 3.4-dB off the theoretical limit. Using ultra-large-area fiber, we
achieve 2000-km single-channel transmission. We also demonstrate 1200-km WDM
transmission on a 50-GHz grid (4-b/s/Hz spectral efficiency), including three passes
through a wavelength-selective switch.
© 2010 IEEE
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