This is a single-mode fiber optic jumper designed specifically for ultra-long distance and ultra-high bandwidth data transmission. It uses lasers as the light source, with the optical signal transmitting in a single mode within an extremely thin core, resulting in almost no modal dispersion. Therefore, it can support networks ranging from gigabit to 100G and even higher speeds, with transmission distances reaching dozens or even hundreds of kilometers. It is the absolute mainstay for key applications such as telecommunications, campus backbone networks, and data center interconnects (DCI).