1 Scope
This International Standard 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 62538;
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– they have three or more ports for directionally transmitting optical power.