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Single mode optical cables can only transmit signal waves of one mode, while multi-mode optical cables can transmit signals of multiple modes; Single mode optical cables have smaller core diameters, typically 9 or 10 μ m, while multimode optical cables have larger core diameters, typically 50 μ m and 62.5 μ m; Single mode optical cables generally use single mode lasers or laser diodes as light sources, while multimode optical cables generally use light-emitting diodes or vertical cavity surface emitting lasers as light sources; Single mode fiber optic cables are more suitable for long-distance transmission, with lower signal loss rates, while multi-mode fiber optic cables are more suitable for transmitting strong signals over short distances; The cost of single-mode fiber optic cable is usually higher than that of multi-mode fiber optic cable, but the specific cost difference depends on the specific application scenario and equipment selection. The price of multi-mode fiber optic cable is relatively cheaper than that of single-mode fiber optic cable. Due to its suitability for short distance transmission and relatively low cost, multi-mode fiber optic cable is widely used in data centers.