Principles of the GPON feature

GPON uses a single optical fiber to connect an OLT, optical splitters, and ONUs, and transmits data using different wavelengths in the upstream and downstream directions. The wavelengths ranging from 1290 nm to 1330 nm are used in the upstream direction, and those ranging from 1480 nm to 1500 nm are used in the downstream direction.
GPON uses wavelength division multiplexing (WDM) to transmit data in different wavelengths on an ODN network. It uses broadcast in the downstream direction and TDMA in the upstream direction.

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