Bandwidth requirements substantially increase with the continuous emergence of innovative applications and services

such as 4G/5G

4K/8K video

and Internet of things. The incoming beyond 100Gbit/s era drives the introduction of innovative technologies into OTN in the aspects of network architecture and service adaptation. These technologies enable OTN evolution towards higher rates

optimize the ethernet service bearer capability

and achieve more flexible and economical network deployment. Based on the research on the beyond 100Gbit/s OTN protocol stack

OTUCn frame structure

bit rate

ethernet mapping

and optical transmission modulation technologies

this document proposes the evolution direction of the beyond 100Gbit/s OTN technology and is meaningful to research and commercial use of related technologies.