G.657

G.657 is an international standard^[1][2] developed by the Standardization Sector of the International Telecommunication Union (ITU-T) that specifies single-mode optical fiber (SMF) cable.

G.657

Characteristics of a bending-loss insensitive single-mode optical fibre and cable
Fiber Optical Cable
Status	In force
Year started	2006
Latest version	5.0 August 2024
Organization	ITU-T
Committee	ITU-T Study Group 15
Related standards	G.651.1, G.652, G.8201
Domain	telecommunication
License	Freely available
Website	https://www.itu.int/rec/T-REC-G.657

History

The G.657 Recommendation builds on a previous fiber optic specification in G.652.^[3][4]

G.657 was first published in 2006. Revisions of the standard were since published in 2009, 2012, 2016, and 2024 (August).^[5][6]