What is a avalanche photodiode?

Avalanche photodiodes, also called APDs, are photodiodes (PDs) that can convert light energy into electrical energy. It is used for detection of light and detection of specific intensity. It features ultra-fast and excellent responsiveness. It is also possible to generate an electron avalanche and induce avalanche amplification. As a result, it has the characteristic of having an amplification function by applying a strong reverse voltage, and can detect even weak optical signals.

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