Let’s say you got really excited when fiber optic communication became available and decided to lay extensive lines throughout your company.
Before long, however, you realize that you only need a few and wonder what to do with the rest.
The unused optical fibers are what are called “dark fiber.” Dark, because the fibers are unlit, unlike optical fibers that send light pulses while transmitting the information.
Strands of dark fiber can be sold or leased to individuals or companies wishing to set up fiber-optic communication channels.
Over the years, the definition of dark fiber has evolved. Now, it refers to the growing process of leasing fiber optic cables from a network provider or fiber infrastructure that is not operated by big carriers. Even if they are in use, they are still called “dark fiber.”