The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because:

fractional change in majority carriers produce higher forward bias current
fractional change in majority carriers produce higher reverse bias current
fractional change in minority carriers produce higher forward bias current
fractional change in minority carriers produce higher reverse bias current

Correct answer: fractional change in minority carriers produce higher reverse bias current

Solution

In reverse bias mode, the photodiode operates by generating a larger current response due to the movement of minority carriers, which are more sensitive to changes in light intensity. This allows for more effective detection of optical signals.

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