Compare dark current with optical current in semiconductor.

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written 7.8 years ago by

Sr no.	Dark current	Optical current
1.	Dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons are entering the device.	Optical current is the electric current that flows through the photosensitive device such as a,photomultiplier tube, photodiode, or charge-coupled device when,photons are entering the device.
2.	It acts as a source of noise in optical communication.	It acts as the desired output signal in optical communication.
3.	A bias voltage across the diode (and the shunt resistance) causes current to flow in the absence of light.	The current flows because of electron hole recombination due to incident photon in an electric field.
4.	The dark current is merely the diode's reverse leakage current.	The optical current is due to incident photon on reverse biased p-n junction.
5.	The dark current is less compared to optical current.	The optical current is proportional to incident photons.

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