Mechanically Variable fiber optic attenuator he mea hoʻohana ʻia e hoʻemi i ka amplitude o kahi hōʻailona māmā me ka hoʻololi ʻole ʻana i ke ʻano nalu ponoʻī.He koi pinepine kēia i nā noi Dense Wave Division Multiplexing (DWDM) a me Erbium Doped Fiber Amplifier (EDFA) kahi i hiki ʻole ai i ka mea hoʻokipa ke ʻae i ka hōʻailona i hana ʻia mai kahi kumu kukui mana kiʻekiʻe.