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We report continuous, multiple-day measurements of polarization-dependent loss (PDL) of several C-band channels on an installed 1800-km terrestrial link. The PDL varies on a time-scale of hours, and the PDL of adjacent channels often track.
We demonstrate a real-time, single-wavelength, coherent 100 G PM-QPSK upgrade of a field system. Performance sufficient for error-free operation after forward-error-correction was achieved over installed 900 km and 1800 km links, proving the viability of seamless 100 Gb/s upgrades.
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