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Compare dark current with optical current in semiconductor.
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written 8.5 years ago by
teamques10
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• modified 8.5 years ago |
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| 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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