Not much to share on wavelengths, however have you heard of "wavelength-division multiplexing"? That's typically applied to an optical carrier.
Wavelengths are what human eyes can percept. Values outside the wavelength are detectable by computers!
Red is my favorite color. I love wearing this color. Do you like the color red? No color preferences here! I do understand it is by orange on the visible spectrum of light. What are all the colors of the visible spectrum? I'm honestly not aware of that info but do you find it interesting that the human eye responds to wavelengths of 390 nm to 700 nm? That is interesting, can you tell me more about these wavelengths?
The term ''wavelength-division multiplexing'' is commonly applied to an optical carrier, which is typically described by its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier which is more often described by frequency.