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A digital isolator is an electronic device that uses non-conductive media such as light, magnetism or capacitance to transmit digital signals to achieve electrical isolation between different circuits. It has functions such as protecting sensitive circuits, resisting interference, signal conversion and improving system reliability.

Optical isolators are widely used in fiber optic communication systems, fiber optic sensing systems, and fiber optic lasers. The basic and common principle of optical isolators is the Faraday effect.