1 Scope
This document applies to circulators used in the field of fibre optics bearing all
of the following features:
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– they are non-reciprocal optical devices, in which each port is either an optical fibre or fibre optic connector;
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– they are passive devices in accordance with the categorization and definition provided in IEC TS 62538;
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– 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.