What is the working principle of an adjustable mechanical optical attenuator
The working principle of MEMS VOA is based on the mechanical movement of the micro-mirror or micro-shutter. An optical attenuator is a passive optical device that has a function opposite to that of an optical amplifier. The attenuator circuit will allow a known source of power to be reduced by a predetermined factor, which is usually expressed as decibels. New for June 2019: mechanically variable attenuators are often used in lab equipment, so that one unit can serve many purposes (instead of a drawer full of fixed attenuators). They are continuously adjustable (using a thumb wheel or a screw head for examples), and consume zero DC power.
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