Does an adjustable light attenuator have a direction
Since an attenuator circuit consists solely of passive resistor elements, it is both linear and reciprocal. An optical attenuator, or fiber optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical fiber. The basic types of optical attenuators are fixed, step-wise variable, and continuously variable. This device uses a single control line, with the voltage at that control determining the attenuation of the device (an "analog" attenuator!): Typical voltage control attenuators can provide attenuation from a minimum of a few dB to.
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