Can I access the internet simply by plugging the fiber optic cable into the router

You cannot access the internet by connecting a fiber optic cable directly to a router; an Optical Network Terminal (ONT) is required to convert the fiber signal into a usable Ethernet connection.Why a Direct Connection Doesn't WorkFiber optic internet transmits data as light pulses, which routers cannot interpret directly. The router requires electrical signals over Ethernet to distribute internet to your devices. The ONT acts as a bridge, converting the light-based fiber signal into an Ethernet signal that your router can use .Typical Setup for Fiber InternetFiber Cable to ONT: The fiber line from your ISP enters your home and connects to the ONT, which may be installed inside or outside your house .ONT to Router: An Ethernet cable links the ONT to your router's WAN port. This allows the router to manage your home network and provide Wi-Fi or wired connections .Router Configuration: Some ISPs require specific settings such as VLAN, DHCP, or PPPoE configuration. Once configured, the router can distribute high-speed internet throughout your home .Optional Combo Devices: In some cases, ISPs provide a single device that combines the ONT and router functions, simplifying the setup .Router CompatibilityNot all routers are compatible with fiber internet. Your router must have a Gigabit Ethernet WAN port and support the speed tier of your fiber plan. Older DSL or cable routers will not work with fiber connections . Modern Wi-Fi 6 or 6E routers are recommended to fully utilize fiber speeds.SummarySimply plugging a fiber optic cable into a standard router will not provide internet access. You need an ONT to convert the fiber signal, and then a compatible router to distribute the connection. Some ISPs offer combo units that integrate both functions, but in most setups, the ONT and router are separate devices .