Optical Detector

Select the devices which are used as Optical detector

• LASER

• PIN diode

• Phototransistor

• optical amplifier

Photodetection is the process of

• converting electrical signal to light signal

• converting optical signal to electrical signal

• regeneration

• amplification

Which of the following diode has an intrinsic semiconductor layer?

• photodiode

• LED

• PIN

• LASER

Which of the photodiode gives internal gain?

• PIN

• Photodiode

• phototransistor

• APD

Photocurrent generated in the absence of light signal is known as___

• light current

• dark current

• white current

• forward current

APDs are preferred for which wavelengths detection?

• short-wavelength

• 400 nm

• 600 nm

• long wavelength

A drawback of most of the APDs

• amplification

• noise

• gain

• avalanche effect

which of the following are the characteristics of a photodiode?

• bandwidth

• SNR

• responsivity

• wavelength

The semiconductor material used for photodiodes

• silica

• GaAsInP

• metal

• plastic

Photodiode always works in

• active region

• cutoff region

• forward bias

• reverse bias