Didn't we already invent much of this with wavelength division multiplexing and optical routing switches, the invention that pierced the tech bubble by quite su

Didn't we already invent much of this with wavelength division multiplexing and optical routing switches, the invention that pierced the tech bubble by quite suddenly increasing bandwidth of in-place fiber pipes by ~100x during a large buildout? (I am not an expert, but this is the narrative I've heard; I may not be using the right words)