Can the router still be used after the fiber optic cable is powered off

Yes, a router connected via fiber optic cable can be powered off, but doing so will immediately cut your internet connection.How Fiber Internet WorksFiber optic cables transmit data as pulses of light and do not require electricity themselves. However, the devices that convert these light signals into usable internet data—namely the Optical Network Terminal (ONT) and your router—require a constant power supply to function . The ONT converts light signals from the fiber into electrical signals for your router, which then distributes internet access to your devices .Effects of Powering OffInternet Connectivity: Turning off the router or unplugging the ONT will immediately disconnect all devices from the internet .Device Safety: Powering off for short periods is generally safe. For longer periods, routers may miss firmware updates, which could affect performance or security .Fiber Cable: The fiber optic cable itself is passive and will not be damaged by powering off the connected devices .Considerations for Power OutagesIf you want to maintain internet access during a power outage, both the ONT and router need backup power, such as a UPS (Uninterruptible Power Supply) or portable battery system . This ensures the network remains operational even when household electricity is unavailable.Practical AdviceFor short-term maintenance or when internet is not needed, it is safe to power off the router and ONT.Avoid leaving the ONT unplugged for extended periods without protection, as the optical connectors are fragile and can accumulate dust .If continuous connectivity is required, consider a battery backup to keep both devices powered. In summary, you can safely power off a fiber-connected router, but doing so will stop your internet service until the devices are powered back on. Proper handling of the ONT and consideration of backup power can help prevent connectivity issues or damage.