Multilevel Signaling Technology for Increasing Transmission Capacity in High-Speed Short-Distance Optical Fiber Communication

Nobuhiko KIKUCHI  

IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.4   pp.316-323
Publication Date: 2019/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018ODI0004
Type of Manuscript: INVITED PAPER (Special Section on Progress in Optical Device Technology for Increasing Data Transmission Capacity)
optical fiber communication,  short reach,  multilevel modulation,  pulse amplitude modulation,  digital signal processing,  

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The needs for ultra-high speed short- to medium-reach optical fiber links beyond 100-Gbit/s is becoming larger and larger especially for intra and inter-data center applications. In recent intensity-modulated/direct-detection (IM/DD) high-speed optical transceivers with the channel bit rate of 50 and/or 100 Gbit/s, multilevel pulse amplitude modulation (PAM) is finally adopted to lower the signaling speed. To further increase the transmission capacity for the next-generation optical transceivers, various signaling techniques have been studied, especially thanks to advanced digital signal processing (DSP). In this paper, we review various signaling technologies proposed so far for short-to-medium reach applications.