The NS series variable fibre optic attenuator provides electrical control of optical power. This is achieved using a patented electro-optical configuration. The solid state optical crystal design eliminates mechanical movement and organic materials. The NS series variable optical attenuators are designed to meet the most demanding operational requirements of ultra-high reliability and fast response time with minimum mechanical footprint. The device is bidirectional. The NS Series VOA is available in either normally transparent or normally-opaque configurations. Agiltron’s PCB driver listed in the web is recommended to operate this device, featuring high efficiency and low cost with 12VDC power and 0-5V control input.