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==Optical modem==
[[File:Tellabs ONT611 inside.jpeg|left|thumb|An ONT providing data, telephone and television service]]
A device that connects to a fiber optic network is known as an [[Network interface device#Optical network terminals|optical network terminal]] (ONT) or optical network unit (ONU). These are commonly used in [[Fiber-to-the home|fiber to the home]] installations, installed inside or outside a house to convert the optical medium to a copper Ethernet interface, after which a router or gateway is often installed to perform authentication, routing, NAT, and other typical consumer internet functions, in addition to "[[Triple play (telecommunications)|triple play]]" features such as telephony and television service. They are not a modem,{{disputed inline|date=April 2024}} although they perform a similar function and are sometimes referred to as a modem.
Fiber optic systems can use quadrature amplitude modulation to maximize throughput. 16QAM uses a 16-point constellation to send four bits per symbol, with speeds on the order of 200 or 400 gigabits per second.<ref>{{cite web
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