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Tetsuya Kawanishi, Takahide Sakamoto, Tetsuya Miyazaki, Masayuki Izutsu, Takahisa Fujita, Shingo Mori, Kaoru Higuma, and Junichiro Ichikawa, "High-speed optical DQPSK and FSK modulation using integrated Mach-Zehnder interferometers," Opt. Express 14, 4469-4478 (2006)