On the basis of the coupled mode theory, the finite-difference method is used to simulate the transmission of Bragg bright solitons in parabolic squared-apodization fiber gratings.

The dyes will give the polyester fiber a bright shade, from reddish violet to greenish-blue, and shows good liglt, weather and sublimation fastness.

There's one bright spot in this struggle: it brings fiber-optic lines deeper into the neighborhoods.