Mechanically Variable fiber optic attenuator ose masini passive e fa'aaogaina e fa'aitiitia ai le tele o se fa'ailo malamalama e aunoa ma le suia tele o le galu lava ia.E masani ona manaʻomia lenei mea ile Dense Wave Division Multiplexing (DWDM) ma le Erbium Doped Fiber Amplifier (EDFA) talosaga lea e le mafai ai e le tagata faʻafeiloaʻi ona talia le faʻailoga e maua mai i se punavai malamalama maualuga.