IEC 60793-1-45:2017 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.IEC 60793-1-45:2017 establishes uniform requirements for measuring the mode field diameter (MFD) of single-mode optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:- improvement of the description of measurement details for B6 fibre;- correction of Equations (1), (2), (5) and (6);- correction of Table E.1, Table E.2 and Table E.3.Keywords: mode field diameter (MFD)