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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.
Implicit training is successfully demonstrated for the first time in a 40-Gb/s QPSK experiment and 224-Gb/s 16-QAM simulation. Overhead-free transmission can be achieved with less than 0.5 dB Q-penalty compared to traditional explicit training scheme.
We present a novel moments-based method for optical signal-to-noise ratio (OSNR) monitoring in polarization-multiplexed coherent optical systems. The method is experimentally demonstrated to show high accuracy in OSNR monitoring over a large range for both constant and non-constant modulus modulation formats.
We numerically and experimentally investigate the limits of terminal-based optical dispersion compensation for nondispersion-managed systems, using coherent transmission technology. The resulting residual dispersion is , which is within the digital signal processing compensation range of first generation coherent transponders.
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