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IEC 61300-3-14:2025 provides a method to measure the error and repeatability of the
attenuation value settings of a variable optical attenuator (VOA). There are two control
technologies for VOAs: manually controlled and electrically controlled. This document covers
both VOA control technologies and also both single-mode fibres and multimode fibres VOAs.
For electrically controlled VOAs, the hysteresis characteristics of attenuation are sometimes
important. The hysteresis characteristics can be measured as stated in Annex B.