800-1700nm 2.5GHZ Indium Gallium Arsenide PIN Photodetector Photodiode Fiber Coupling

Ordinary diodes are in the cut-off state when the reverse voltage is applied, and only a weak reverse current can flow. The photodiode is designed and manufactured to make the area of the PN junction relatively large in order to receive the incident light. The photodiode works under the action of reverse voltage. When there is no light, the reverse current is extremely weak, called dark current; when there is light, the reverse current rapidly increases to tens of microamps, called photocurrent. The greater the intensity of light, the greater the reverse current. The change of light causes the current of the photodiode to change, which can convert the light signal into an electrical signal and become a photoelectric sensor device.