A system for teaching and demonstrating eavesdropping in fiber-optic communication comprises a sending end, a receiving end, and an eavesdropping end. The receiving end is connected to the sending end by means of an optical fiber cable. When an optical signal is transmitted between the sending end and the receiving end by means of the optical fiber cable, the eavesdropping end uses a light splitting module held on the optical fiber cable to bend the optical fiber, such that a small amount of light leaks, and the optical signal carrying source data is acquired from the optical fiber cable. Then, the source data is restored by means of key-based decryption, such that eavesdropping in fiber-optic communication is achieved. Three optical communication modes for source data processing are supported between the sending end and the receiving end. Effects of data restoration for these three modes are demonstrated at the eavesdropping end so as to indirectly show the differences in anti-eavesdropping capabilities of the three fiber-optic communication modes. The system for teaching and demonstrating eavesdropping in fiber-optic communication integrates teaching and demonstration for three modes, visually and intuitively demonstrates an anti-eavesdropping effect of quantum key encryption in comparison with other methods, and actively and practically promotes the popularization of science.
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