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This is a system architecture of the Optical Ethernet Transceiver Modem (OETM) which allows a bidirectional transmission of optical signals and electrical signals (Ethernet). Given an optical input signal, the data can be transmitted over Ethernet and the optical output directly. A given Ethernet input is transformed into an optical output signal and also an Ethernet output.

Does anyone know what "50:50" (red circle) is?

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