fibre-optic cable
noun [ C or U ] (US fiber-optic cable) uk/ˌfaɪ.bərˌɒp.tɪk ˈkeɪ.bəl/ us/ˌfaɪ.bɚˌɑːp.tɪk ˈkeɪ.bəl/
光缆
a very thin glass or plastic thread through which light can travel to carry information, especially in phone, television, and computer systems