FOREWORD

Tsuyoshi Yamamoto
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,
more » ... and multi-channel integration are actively investigated. The aim of this special section is discovering state-of-the-art optical device and related technologies for increasing data transmission capacity in both short and long distance communication. After careful reviewing process, this special section consists of 8 full papers (invited papers), which cover various technologies such as silicon photonics, InP-based monolithic integration, multi-level modulation, and module packaging as well as new approaches.
doi:10.1587/transele.2018odf0001 fatcat:vaar5ohzq5clbbqez23n2p77gu