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optical attenuator
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.
==Applications of Optical Attenuators==
Optical attenuators are commonly used in fiber optic communications, either to test power level margins by temporarily adding a calibrated amount of signal loss, or installed permanently to properly match transmitter and receiver levels. Sharp bends stress optic fibers and can cause losses. If a received signal is too strong a temporary fix is to wrap the cable around a pencil until the desired level of attenuation is achieved.〔(Using Attenuators With Fiber Optic Data Links )〕 However, such arrangements are unreliable, since the stressed fiber tends to break over time.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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