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T. Hiraki et al., “Si-waveguide-integrated Superconducting Nanowire Single-photon Detector with Low-loss Spot-size Converter” in Proceedings of International Conference on Nanophotonics and Nanooptoelectronics, 2017/4.
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M. Nakajima et al., “SDM-Compatible Dynamic Gain Equalizer Using Spatial Planar Optical Circuit” in Proceedings of Optical Fiber Communication Conference, 2017/3.
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