The ST fiber optic attenuators are metallic body and ceramic sleeves, it is female to male type attenuator used to connect the ST optical connectors while providing the optical power reducing at a certain level, the ST fiber optic attenuator are 1dB to 30dB range, capable. The ST fiber optic attenuators are metallic body and ceramic sleeves, it is female to male type attenuator used to connect the ST optical connectors while providing the optical power reducing at a certain level, the ST fiber optic attenuator are 1dB to 30dB range, capable. FS fixed and variable fiber optic attenuators with leading attenuating fibers guarantee consistent and stable fiber attenuation (0~60dB) in WDM transmission. These fiber optic attenuators consist of a male ST connector on one end and a female ST connector on the other end. When a cable end in inserted into the female end, the remaining male end can be connected to the equipment where the cable would otherwise connect directly, but providing the desired. Fiber optic attenuators are devices used to reduce or monitor the power level of a fiber optic signal. Basic types of fixed attenuation include single mode, dual window and multimode in D4/PC, FC, FC/UPC, MU, SC, SC/APC and UPC, ST and ST/UPC style connectors. Manufactured with a metal-ion doped fiber, these attenuators can handle over 1W of high power light exposure for an extended period of time.