Yes, a router can work with fiber optic internet. The router connects to the ONT via an Ethernet cable, allowing you to access internet services including high-speed streaming, video conferencing, and cloud applications. After setup, the technician. The ONT is linked to your router or gateway using an Ethernet cable. * For larger homes, mesh. 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. To use it, you'll need a router that supports high-speed data transfer.