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DP-QAM is one of the most promising paths towards 400-Gb/s and 1-Tb/s commercial optical communications systems. For DP-QAM transmitter, different tributary channel powers lead to IQ or XY power imbalance. Large uncompensated IQ or XY power imbalance can significantly degrade the performance in the coherent optical communications system. In this work, we propose and experimentally demonstrate a technique to detect and compensate DP-QAM transmitter power imbalances for tributary channels. By reconfigurably interfering de-skewed identical BPSK channels, the optical powers of any two tributaries can be balanced by minimizing the output power from their optical interference.
Yang Yue,Qiang Wang,Bo Zhang,Andre Vovan, andJon Anderson
"Detection and compensation of power imbalances for DP-QAM transmitter using reconfigurable interference", Proc. SPIE 10130, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI, 101300M (28 January 2017); https://doi.org/10.1117/12.2251036
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Yang Yue, Qiang Wang, Bo Zhang, Andre Vovan, Jon Anderson, "Detection and compensation of power imbalances for DP-QAM transmitter using reconfigurable interference," Proc. SPIE 10130, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI, 101300M (28 January 2017); https://doi.org/10.1117/12.2251036