The device similar to a DSL router, but used in a FTTH environment is called an optical network unit.

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An optical network unit (ONU) is a device used in a FTTH (Fiber-to-the-Home) environment to connect the fiber optic cable to customer premises equipment, such as a router. It is also known as a fiber network terminal or optical line terminal. It acts as a translator between the optical signal coming in through the fiber optic cable and the electrical signal going out to the customer's device.

The Device Similar to a DSL Router, but Used in a FTTH