fibre-optic transmission system vs fiber-optic transmission system

fibre-optic transmission system and fiber-optic transmission system both are nouns.

Word	Noun	Adjective	Verb	Adverb
fibre-optic transmission system	Yes	No	No	No
fiber-optic transmission system	Yes	No	No	No

As nouns, fibre-optic transmission system and fiber-optic transmission system are synonyms defined as:

fibre-optic transmission system and fiber-optic transmission system: a communication system using fiber optic cables

Other synonyms of fibre-optic transmission system include FOTS.

fibre-optic transmission system (noun)	fiber-optic transmission system (noun)
a communication system using fiber optic cables	a communication system using fiber optic cables