To set up your router for fiber internet quickly, connect the router to your fiber modem, access the router's settings via a web browser, and input the provided ISP credentials. Make sure to update the firmware, configure Wi-Fi security, and customize your network name for. In this guide, we'll walk you through how to connect a fiber optic cable to a router safely and efficiently. Fiber optic internet is a. A fiber-optic connection is the best choice for fast home internet as it has a number of advantages compared to traditional copper cables, such as faster speeds and less interference.