Fiber optic cables are much thinner and lighter than metal wires. Data can be transmitted rather than analogically. The main disadvantage of fiber optics is that the cables are expensive to install. In addition, they are more fragile than wire QSFP+ and are difficult to splice. Fiber optics is a particularly popular technology In addition, telephone companies are steadily replacing traditional telephone lines with fiber optic cables. In the future, almost all communications will employ fiber optics