| http://www.w3.org/ns/prov#value | - Accordingly, the auxiliary system 4 (#1) and the auxiliary fiber 8 (#1) become a specific auxiliary system and a specific auxiliary fiber, respectively, and the control signal including data for designating the auxiliary system 4 (#1) is sent to the attenuating unit 16, thereby attenuating the main optical signal in the auxiliary fiber 8 (#1).
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