fibre optics
Concise Oxford English Dictionary © 2008 Oxford University Press:
fibre optics
▶plural noun [treated as sing.] the use of thin flexible transparent fibres to transmit light signals, chiefly for telecommunications or for internal inspection of the human body.
– derivatives
fibre-optic adjective.
fibre-optic adjective.
'fibre optics' also found in these Oxford entries:

