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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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Anna Koroleva
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That is a symbol for a 50:50 fiber coupler. Assuming you are looking at this document:

https://www.arching.at/fileadmin/user_upload/redakteure/Forschungspreis/2020/Lamprecht_Christopher_Masterarbeit.pdf

They give the exact part number as the Thorlabs BXC15.

user1850479
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