Comcast Tests 100-Gig Optical Links > Time Warner also testing this ...

Time Warner also testing this ...

Dense Wave Division Multiplexing (DWDM) is just "colorization" of the light into various wavelengths so that you can have multiple connections all share the same physical fiber strand. You shoot in each color using frequency tuned lasers on one side and you use a prism to break the light out into optical ports at the destination. The magic is how precise the prism and lasers need to be manufactured to be able to work with narrow wavelength bands.

The interesting aspect of this story is the 100GigE part which is a significant upgrade from the n x 10GigE or OC768 40G solutions today. The DWDM solution using ROADM technology is is old news.