fiber optics vs transmission

fiber optics and transmission both are nouns.

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

As nouns, transmission is a hypernym of fiber optics; that is, transmission is a word with a broader meaning than fiber optics:

fiber optics (noun)	transmission (noun)
the transmission of light signals via glass fibers	the act of sending a message; causing a message to be transmitted
	the gears that transmit power from an automobile engine via the driveshaft to the live axle
	communication by means of transmitted signals
	an incident in which an infectious disease is transmitted
	the fraction of radiant energy that passes through a substance