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Guo-Wei Lu, Mats Sköld, Pontus Johannisson, Jian Zhao, Martin Sjödin, Henrik Sunnerud, Mathias Westlund, Andrew Ellis, and Peter A. Andrekson, "40-Gbaud 16-QAM transmitter using tandem IQ modulators with binary driving electronic signals," Opt. Express 18, 23062-23069 (2010)