Fixed and variable attenuators in LC, SC, FC types — 1 to 30 dB range for precise optical power management. This article explains what a fixed fiber optic attenuator is, how it works, where it is used, and how to select the right attenuator for different fiber optic. FS fixed and variable fiber optic attenuators with leading attenuating fibers guarantee consistent and stable fiber attenuation (0~60dB) in WDM transmission. Limit the optical power on single mode fiber anywhere from 3 to 15dB.