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. Key Takeaways: Yes, you can use your own router with fiber internet, as long as it has a Gigabit Ethernet WAN port to connect to your ISP's Optical Network. Using a 150Mbps wireless router with a 200Mbps fiber optic connection Using a 150Mbps wireless router with a 200Mbps fiber optic connection To prevent your router from "bottlenecking" your network, we recommend using a router that"s capable of faster speeds than your Internet connection. To see. TP-Link router speed isn't one single number. Click here to get more detail of associated/link speed.