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We have successfully demonstrated a field trial of 160-Gbit/s, RZ-DQPSK polarization-division multiplexed transmission system over 214 km using automatic polarization control. Q-factors of the signals have been kept stable for more than five days.
We propose an all-optical 2R-regenerative interconnection node which is applied between wide area network and metro area network for DPSK polarization-division multiplexed systems with the functions of signal format conversion and signal quality improvement.
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