scope:

;lt;!-- NEW! --;gt;IEC 62077:2022 is available as ;lt;a href="https://webstore.iec.ch/publication/78213";gt;IEC 62077:2022 RLV;lt;/a;gt; which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.;lt;/br;gt;;lt;/br;gt;IEC 62077: 2022 applies to circulators used in the field of fibre optics bearing all of the following features: - they are non-reciprocal optical devices, in which each port is either an optical fibre or fibre optic connector; - they are passive devices in accordance with the categorization and definition provided in IEC TS 62538; - they have three or more ports for directionally transmitting optical power. An example of optical circulator technology and application is described in Annex A and Annex B, respectively. This fourth edition cancels and replaces the third edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - harmonization of terms and definitions with IEC TS 62627-09; - change of Clause 4 regarding requirements