These modified DNA strands seem to act more like the photosynthetic electron-transport system than they do optical fibers. In fact, one of the applications listed is "light harvesting in artificial photosynthetic systems." It is curious that TFA describes this as a fiber optics corollary.
Fiber optics works based on the principles that photons will reflect off of a surface given a sufficient difference in refractive index and approach angle, allowing high-bandwidth communication. This new DNA photon transport system seems to have very little resemblance. I would guess that using DNA for communication would be very slow and very low bandwidth, to the point of being practically infeasible.

Good point... Better make that:
sudo rm -rf /