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Satoshi Tsunashima, Fumito Nakajima, Yusuke Nasu, Ryoichi Kasahara, Yasuhiko Nakanishi, Takashi Saida, Takashi Yamada, Kimikazu Sano, Toshikazu Hashimoto, Hiroyuki Fukuyama, Hideaki Nosaka, and Koichi Murata, "Silica-based, compact and variable-optical-attenuator integrated coherent receiver with stable optoelectronic coupling system," Opt. Express 20, 27174-27179 (2012)