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FOREWORD
2019
IEICE transactions on electronics
With a steady increase in data traffic, research and development for larger transmission capacity have been continuously proceeded and 400-Gb/s optical transceivers are commercialized nowadays. In old days, increasing transmission capacity of an optical transceiver meant increasing operation speed of optical and electrical devices. However, now operation speed of devices is approaching their physical limit so that different approaches such as digital coherent technology, multi-level modulation,
doi:10.1587/transele.2018odf0001
fatcat:vaar5ohzq5clbbqez23n2p77gu