Which of the below is used in detecting the optical signals?

Option 2 : Photodiode

CONCEPT:

• An optical signal is basically an electromagnetic signal.
• It is the term very much familiar with optical communication.
• Optical communication is the mode of communication in which we use light to carry information over long distances.
• The photodiode is used for detecting the optical signals. While reverse bias is applied, observing the change in the current with the light intensity will help in detecting the optical signals.
• The photodiode is a diode which generates a potential difference when exposed in the light

EXPLANATION:

• Zener diode is used in voltage regulation, in switching circuits and clipper circuits. Therefore option 1 is incorrect.

• It is the property of a certain diode or semiconductor to produce a potential difference when exposed to light. Therefore option 2 is correct.
• P-n junction diode is used in all LED applications and also to create temperature sensors. Therefore option 3 is incorrect.