Hmm, I would think this would be detrimental to transmission.
There are various grades of fiber. Lower grades can only transmit basically in one "band" (of color - simplified), and the range before having to be regenerated (repeaters) is shorter. Tolerances are also much tighter - think specific length in regards to wavelength.
Better grades of fiber can have much longer ranges before regeneration is needed, and can have multiple "bands" being transmitted at the same time. The tolerances are generally quite a bit looser as well.
Having the "bands" split out seems like it would cause problems by dividing/reducing the transmission power (shorter range) and by requiring more frequent regeneration.
There may be more to it than I'm reading or what's in the article, but this is what I'm getting from it.
