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The current in the forward bias is known...

The current in the forward bias is known to be more (-mA) than the current in the reverse bias `(-mu A)`. What is the reason, then, to operate the photodiode in reverse bias ?

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Reverse bias current is very small so it can sense the small change produced by photo diode current much better.
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AAKASH INSTITUTE ENGLISH-SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS-Try yourself
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