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 optimal performance. However, setting up a fiber optic connection to your router can seem daunting if you're unfamiliar with the process. In this guide, we'll walk you through how to. Fiber to Ethernet media converters adapt between a typical RJ-45 copper Ethernet cable and fiber-optic cable. Fiber at 100Mb/s for just $19 and installed THE SAME DAY.