Is coupled pairs an appropriate phrase?

The term coupled pair applies to a pair of two objects that have the property of exerting forces on each other and are therefore capable of exchanging energy with each other. I suggest the Earth and Moon as an example of a coupled pair because they are connected by the gravitational force.

Wikipedia has a handy and more general account:

Two objects are said to be coupled when they are interacting with each other. In classical mechanics, coupling is a connection between two oscillating systems, such as pendulums connected by a spring. The connection affects the oscillatory pattern of both objects. In particle physics, two particles are coupled if they are connected by one of the four fundamental forces (gravitational, electromagnetic, strong and weak interactions).

Wikipedia

The term is therefore in necessary and acceptable use in physics and physical chemistry.

It is hard to see how extension of meaning to a pair comprising wavelength and intensity is justified, because these are two characteristics of electromagnetic radiation that cannot exchange energy with each other, there being no force between them, so they cannot be coupled.

The terms suggested by other commentators are therefore more appropriate in this context. Use ordered pairs or paired values.