Variable Plug in Attenuators(male - female) has a ceramic alignment sleeve that provides a low insertion loss of 0.15dB and can be used on both multimode and singlemode applications.  This "air-gap control" variable attenuator is commonly used as a verification tool and for temporary adjustment of the attenuation value. Different attenuation value can be maintained.

The Variable plug in attenuator has included tool provides ability to increase attenuation level to desired dB. Their attenuation range is 0dB to 20dB depending on light source.

ADTEK provides a wide range of plug-type single mode and multimode variable attenuator. They have low return loss and works at both 1310nm and 1550nm wavelength range. ST and FC connector types with PC or APC polish are available, as well as SC and LC types of attenuators.