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Avalanche photo diode is used when compared to PIN diode beco'z--?

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Answer:

The output current of a PIN diode is proportional to the light incident . Whereas in APD due to internal multiplication (Avalanche multiplication) of primary photocurrent, higher gains are possible.
A small signal current output from the pin diode are to be amplified before applying to next associated receiver circuit. This includes thermal noise in the main signal, giving lower, receiver sensitivity. In case of APD, photocurrent is multiplied before encountering the thermal noise amplifier, giving increased receiver sensitivity.

First answer by Kenshin1988. Last edit by Kenshin1988. Contributor trust: 0 [recommend contributor ]. Question popularity: 1 [recommend question].

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