Q: Can I plug a fiber optic cable directly into a router? A: Only if your router has an SFP port designed for fiber. Q: Do I need a special router for fiber optic internet? A: While not all routers support fiber, many modern models. To connect your fiber optic cable to a router, ensure you have the following: Fiber optic modem (ONT): Most fiber connections require an Optical Network Terminal (ONT), provided by your ISP. The fiber line terminates at the Optical Network Terminal (ONT), which is typically supplied and installed by the internet service provider. This. 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. This guide will break down everything you.