An optical splitter is a passive bidirectional element, which is used to connect a large number of subscribers/ONUs to an OLT. It is one of the most important elements of all FTTx PON and OLAN networks. PON networks rely on passive components (no power required) to transmit data between a central OLT (located in a. A GEPON system usually consists of an OLT (Optical Line Terminal) at the service provider's central office and multiple ONU (Optical Network Units) or ONT (Optical Network Terminals) close to the end user as optical splitters. Typically, but not always, there is one input in and multiple outputs. Light power goes in and light power coming out. Optical splitters play an important role in FTTH PON networks where a single optical input is split into multiple output, thus allowing a single PON interface to be shared among many subscribers.
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