fiber optics (US) noun
or British fibre optics
or British fibre optics
Learner's definition of FIBER OPTICS
[noncount] technical
: the use of thin threads of glass or plastic to carry very large amounts of information in the form of light signals光纤
— fiber-optic
(US) or British fibre-optic /ˈfaɪbɚˌɑːptɪk/ adjective, technical