112Gb/s PolMux RZ-DQPSK with fast polarization tracking based on interference control

We implement fast, precise and endless optical polarization tracking of high-speed polarization-multiplexed DQPSK signals. Stable polarization demultiplexing for polarization scrambling speeds up to 800 rad/s combined with 112 Gb/s direct detection PM-RZ-DQPSK transmission over 1035 km is demonstrated.