PCI Express over Fiber [video]

Blog post for people who prefer reading: https://hackaday.com/2026/04/11/implementing-pcie-over-fiber...

While at a higher level, thunderbolt and https://en.wikipedia.org/wiki/ExpEther can both of course work over fiber too!

(Q|O)SFP are basically just raw high speed serial interfaces to whatever - you see this a lot in FPGAs, you can use the QSFP interfaces for anything high speed - PCIe, SATA, HDMI…

This was a super interesting video to watch. I honestly thought SFP required more setup, but this explains why AliExpress is so ripe with USB3 and HDMI over SFP converters that are dirt cheap.

I love the Neon Genesis background, awesome project too.

How does this compare to something like RDMA over Converged Ethernet (RoCE)?

Cool project! PCIe itself I think is likely to end up doing something similar soon, there are provisions in the spec now for optical retimers.

There's a number of optical modules for TB3 and TB4, might be an easier (but less fun) route as TB3 and TB4 can carry PCIe.

So you're saying I can put a handful of 4090's out in the middle of snowy Michigan with a handful of OM4 cables snaking into my basement to run legit arctic cooling with no noise?

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