I rescued an old Dell S4810 switch from the recycle bin.
Just the switch. No transceivers.
I haven't had any experience with fiber tech up to this point.
The Dell S4810 has 48 10GbE SFP+ ports.
The S4810 spec sheet (see attached) shows support for SFP+, 10GbE, SR, 850nm, 300m transceiver...