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A Stokes vector based non-data-aided DGD monitoring scheme for 40-Gb/s polarization-multiplexed coherent optical OFDM systems with low-bandwidth sampling is reported. The DGD estimation error is less than 2.5 ps after 1000-km long-haul transmissions.
We experimentally demonstrate full-transmission chromatic dispersion estimation with high accuracy in 40-Gb/s coherent polarization-multiplexed single-carrier system using binary complementary Golay training sequences. The technique is verified to be robust against polarization-mode-dispersion and amplified-spontaneous-emission noise.
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