Summary

Supplement 39 to ITU-T G-series Recommendations provides information on the background and methodologies used in the development of optical interface Recommendations such as ITU-T G.691, ITU-T G.957 and ITU-T G.959.1. This edition introduces Probabilistic Constellation Shaping and describes the use of Sub Carrier Multiplexing in Point to Point and Point to Multipoint applications in addition to other miscellaneous corrections and improvements