Which of the following methods are used to protect fiber optic cables?

The method of protecting fiber optic cables referred to in the correct answer is the use of Loose Tube and Tight Buffered designs. These two methods represent different ways of organizing and protecting the optical fibers within the cable, each suited for various environments and applications.

Loose Tube constructions help to house the fibers in a way that allows for thermal expansion and contraction without putting stress on the fibers themselves. This design is particularly beneficial in outdoor installations where temperature fluctuations are common, as it allows the fibers to move independently of their surroundings.

On the other hand, Tight Buffered designs provide a more robust protection for fibers, encased in a protective layer that is beneficial for indoor applications. This design is capable of withstanding handling and installation stresses, making it ideal for environments where cables may be frequently manipulated or where space is limited.

By understanding these methods, one can ensure that fiber optic installations are optimized for their specific usage, protecting the delicate fibers from environmental influences and physical damage.