The optical fiber adjustable attenuator is a product specially used for manually adjusting the attenuation of optical fiber optical path. All input and output fibers are polarization maint ining to maintain the polarization state of the light. It is used to attenuate input optical power, preventing potential damage to receiving equipment from excessive power. Designed for precision optical power control, the Polarization-Maintaining (PM) Variable Optical Attenuator is an essential tool for testing and optimizing optical components and systems. In addition, electronic control.