GPON networks normally end with an ONT device, which is normally an embedded Linux device with a bridge interface, bridging an Ethernet interface and the optical GPON interface. In this way the GPON interface is exposed as an Ethernet device to the router. All of this is often embedded in a SFP module.
Now, do "pure" GPON network interface cards exists, for example in the form of a PCI-e card? With such device I'd be able to connect the GPON fiber directly to a router, which will also act as a ONT, without an intermediate device.
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