Fiber optic cable weighs less than comparable copper cable. Lighter weight makes fiber easier to install. Fiber optic cable has a smaller cross section than the copper cables it replaces. Since the fiber is a dielectric, it does not present a spark hazard. What's more, cables are available with the same flammability ratings as copper counterparts to meet code requirements in buildings.
Optical fibers are quite difficult to tap.
Since they do not radiate electromagnetic energy, emissions cannot be intercepted. And physically tapping the fiber takes great skill to do undetected. Thus, the fiber is the most secure medium available for carrying sensitive data. Its small size and lighter weight give it an installation edge for pulling and installing, especially in tight spaces. And it's safe and secure.