fiber optics vs fibre optics

fiber optics and fibre optics both are nouns.

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

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

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

Other synonyms of fiber optics include fiberoptics, fibreoptics.

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