Fiber optic attenuator is used in the fiber optic communications to reduce the optical fiber power at a certain level. The most commonly used type is female to female (adaptor type), female to male (plug-in type) and in-line type. Adopting advanced attenuation fiber technology, Rollball plug-in and adaptor type fixed value attenuator features high power endurance and low back reflection, suitable for high speed digital transmission and analog applications. Available in single-mode or multi-mode, FC, SC, ST, LC and MU type.