ST Male-Female Fiber Optic Attenuator manufactured by Veston Limited is device to reduce signal power in fiber optic links by inducing a fixed loss. It is used to control the power level of optical signals at the outputs of light sources and electrical-to-optical (E/O) converters. ST Male to Female Attenuator provides a stable attenuation (from 1 to 30 dB) at 1310nm/1550nm transmission window.