An optical fiber is a cylindrical dielectric waveguide (nonconducting waveguide) that transmits light along its axis through the process of total internal reflection. The fiber consists of a core surrounded by a cladding layer, both of which are made of dielectric materials.
Replacing the deuterium isotope with a hydrogen atom in these compounds increases their lifespan up to 10 times and also improves their electrical properties to a great extent. This technology has been commercialized