Yes, a router can work with fiber optic internet. The router connects to a fiber optic modem or Optical. Are you in search of the perfect router for your optical fiber internet connection? Look no further! In this guide, we'll explore the top options available on the market to ensure you experience blazing-fast speeds and seamless connectivity. To use it, you'll need a router that supports high-speed data transfer. XN020-G3 provides. Most fiber ISPs, including Mercury, provide an ONT that connects directly to your router via an Ethernet cable.