Why add an attenuator to the end of an optical fiber
Optical attenuators are commonly used in, 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. Attenuators enable the fine-tuning of adjustable signal power and ensure that the signal power reaching the receiver is within its dynamic range, preventing saturation and maintaining the signal-to-noise ratio. Also, by preventing overloading, attenuators can increase the lifespan of network.
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