Yes, you can often use your existing router with fiber optic internet, but there are crucial considerations. Understanding compatibility, potential limitations, and when an upgrade is necessary will ensure you get the most out of your high-speed connection. Fiber Optic Cables The type of cable you choose depends largely on the distance and the environment in. For a home installation I would install some point-to-point wireless, they are much easier to install and maintain for this use case, and you will have to avoid making a big trench and possible problems with rodents and so on. However, the market is flooded with countless options, making the selection quite overwhelming.