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We demonstrate the add/drop operation and transmission of 120Gbit/s (10 Gsymbol/s) polarization-multiplexed (PDM) 64 QAM digital coherent signals in a deployed ROADM network. By equalizing waveform distortions at the ROADM node with an FIR filter, the QAM signal was successfully add/drop-multiplexed, and transmitted over a 50 km ring network testbed with neighboring 9 × 10Gbit/s OOK WDM data. This indicates the applicability of digital coherent systems to the deployed ROADM network based on 10Gbit/s OOK, and its upgradability to 120Gbit/s PDM64 QAM.

First demonstration of digital coherent transmission in a deployed ROADM network with a 120 Gbit/s polarization-multiplexed 64 QAM signal