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<p class="PARAGRAPH"> <span lang="EN-GB">IEC 61202-1:</span><span lang="EN-GB"> 2016(E) applies to isolators used in the field of fibre optics, all exhibiting the following features: - </span><span lang="EN-GB">they are non-reciprocal optical devices, in which each port is either an optical fibre or fibre optic connector; - they are passive </span><span lang="EN-GB">devi</span><span lang="EN-GB">c</span><span lang="EN-GB">es</span><span lang="EN-GB"> containing no opto-electronic or other transducing elements; - they have two optical ports for directionally transmitting optical power. This fourth edition cancels and replaces the third edition published in 2009. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the terms and definitions were reconsidered; - quality assessment level was deleted from classification; - the clause numbers of Annexes A and B have been rearranged.<o:p></o:p></span> <span lang="EN-GB">Keywords: </span><span lang="EN-GB">isolators used in the field of fibre optics<o:p></o:p></span>