Could someone revive the GigaIR protocol?
You can probably implement or use it with $1 worth of components connected to any modern SBC. It's a solution... what's the problem? Start there!
Uhhhh, no.
IrDA hardware is tuned for low quality LEDs and Photodiodes that have as far as several meters to traverse. (Aka: more noise issues).
To go Gbps bandwidth, you need higher quality everything. You probably have a better job starting from Ethernet SFP kinds of fiber optics rather than the cheap IrDA hardware.
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You probably will have great difficulty reviving 4Mbps fast IrDA, let alone 1000Mbps protocols that were only ever a spec sheet in practice....