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Among many fiber optic cables, single-mode optical fiber and multi-mode optical fiber are two common types that have attracted much attention. They have significant differences in structure, transmission characteristics, and application fields.

Hollow-core fiber uses air as the transmission medium, replacing the traditional optical fiber that uses "glass core" as the transmission medium. With ultra-low latency, ultra-low nonlinearity, potential ultra-low loss and wider passband bandwidth, hollow-core fiber can help OTN systems achieve greater transmission capacity, longer transmission distance, and smaller transmission time delay.