fibre optics vs fiber optics

fibre optics and fiber optics both are nouns.

Word	Noun	Adjective	Verb	Adverb
fibre optics	Yes	No	No	No
fiber optics	Yes	No	No	No

As nouns, fibre optics and fiber optics are synonyms defined as:

fibre optics and fiber optics: the transmission of light signals via glass fibers

Other synonyms of fibre optics include fiberoptics, fibreoptics.

fibre optics (noun)	fiber optics (noun)
the transmission of light signals via glass fibers	the transmission of light signals via glass fibers