With the development of fiber optics communication industry, optical attenuator has emerged as a very important optical passive device. It can reduce the power level of an optical signal as required.
There are many kinds of optical attenuators, which comprise different elements. Some fiber optic attenuators are made up with attenuation fiber. Some come with an optical attenuation film or collimator. Moreover, some kinds of optical attenuator are made based on fiber bending loss principle.
The attenuation unit also can be classified into the fixed attenuator and the variable attenuator. It is commonly used in fiber optic communications for absorbing or reflecting, system assessment and various testing laboratories.