Recent Standardization Activities in ITU-T on Single-mode Optical Fiber and Space Division Multiplexing Technologies

Optical fiber standards have been discussed in the International Telecommunication Union - Telecommunication Standardization Sector (ITU-T). Various standards (Recommendations) have been developed based on discussions at Study Group 15 and are revised according to the progress in the optical fiber telecommunication system. In this article, recent standardization activities in ITU-T on singlemode optical fiber (SMF) are described. Also, recent discussion toward standardizing space division multiplexing technologies, which are promising for overcoming the capacity limit of SMF, is introduced. © 2021 Nippon Telegraph and Telephone Corp.. All rights reserved.