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. However, setting up a fiber optic connection to your router can seem daunting if you're unfamiliar with the process. Here's a step-by-step guide to help you through it. Check Your Fiber Optic Equipment Before you start, make sure you have the necessary equipment: Fiber Optic Modem (ONT β Optical Network Terminal):.