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We transmit all-electronically multiplexed 107-Gbaud polarization-multiplexed quadrature-phase-shift-keying over 4,800-km using coherent detection based on a real-time oscilloscope with 63-GHz electronic bandwidth. Ten WDM channels on a 120-GHz grid yield a spectral efficiency of 3.3 b/s/Hz.
A low-power CMOS-driven VCSEL-based link using a 2-tap feed-forward equalizer in the transmitter is reported at 850-nm wavelengths. Power efficiencies of 1.5, 2.0, and 3.8 pJ/b are achieved at 22.5, 25, and 28.5 Gb/s, respectively.
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