A Collimator Variable Optical Attenuator (VOA) is a fiber optic attenuator that is available in Single mode 9/125, Multimode 50/125 and Multimode 62.5/125. These attenuators can be terminated with various connector options including, LC, LC/APC SC, SC/APC, FC, FC/APC and ST. This tool is highly effective when used for optical components power adjustment and in systems tests.