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(C) An $APD$ stands for Avalanche Photodiode. In an optical fiber communication system, the receiver end requires a device that can detect the incomin

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Converting optical signals into electrical signals

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(C) An $APD$ stands for Avalanche Photodiode. In an optical fiber communication system, the receiver end requires a device that can detect the incoming light pulses and convert them back into electrical signals. An $APD$ is a highly sensitive semiconductor photodiode that uses the avalanche effect to provide gain, making it ideal for detecting weak optical signals and converting them into electrical signals. Therefore, the correct function of an $APD$ is to convert optical signals into electrical signals.

In optical fiber communication, an $APD$ semiconductor is used for:

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