What is fiber internet, and is it worth it?
Fiber-to-the-home is the fastest, most reliable home internet technology widely available in the US. This guide covers what fiber actually is, why upload speed is the headline feature, and how to know if you can get it at your address.
How fiber internet works
Fiber-optic cables transmit data as pulses of light through strands of glass roughly the diameter of a human hair. Because light travels at near-light-speed and each strand can carry many simultaneous wavelengths, a single fiber line can deliver tens of gigabits per second to your home — far beyond what copper telephone lines (DSL) or coaxial cable lines (cable) can handle.
Fiber-to-the-home (FTTH) means a fiber line runs all the way from the carrier's central office to a small box on the side of your house. Inside the home, an optical network terminal converts the light signal into Ethernet for your router.
Why upload speed matters
The headline difference between fiber and cable is symmetric speed. A 1 Gbps fiber plan delivers 1 Gbps download and 1 Gbps upload. A 1 Gbps cable plan typically delivers 1 Gbps download but only 35 Mbps upload — a 28× difference.
Slow upload throttles video calls, file backups, security camera streams, smart-home devices, and anything else that has to push data out of your home. As more devices join your network and more work happens from home, fiber's symmetric upload becomes the dominant value.
Who offers fiber in the US
The largest US fiber networks are AT&T Fiber, Verizon Fios, Frontier Fiber, Google Fiber, Brightspeed, Metronet, Ziply Fiber, and Quantum Fiber (CenturyLink). Cable carriers like Xfinity and Optimum are also rolling out fiber in select markets.
Whether you can get fiber depends entirely on the provider footprint at your specific address. The same street can have fiber on one side and only cable on the other, depending on which carrier built first.
How much does fiber cost?
Entry-level fiber plans (200-500 Mbps) typically run $30-50/month. 1 Gbps fiber averages $65-90/month nationally. 2-5 Gbps multi-gig plans run $100-180/month. Most fiber providers do not impose data caps, equipment rental fees, or annual contracts.