for home use I'd highly recommend sticking with just 10GbE because you're not locking yourself into a dead-end solution of used weird previous gen infiniband stuff.
if you get a $200 switch with a few 10GbE interfaces in it you can easily expand things in the future by trunking vlans to another newer 10GbE capable switch, or connecting to a switch that has multi-gig copper ports for access ports to 2.5/5GBaseT capable desktop PCs and laptops, etc.
$40 for a 10 meter fiber optic cable is a high price when you can buy LC-LC UPC 9/125 duplex 2 meter cables for $3.50 to $4.70 a piece (or a few cents more for additional meters) and connect them between $20 transceivers. no matter what route someone goes with would recommend buying $30-40 of basic fiber connector cleaning supplies.
if one wants to buy used weird previous gen dead-end stuff there are also tons of very cheap 40GbE mellanox ethernet adapters on ebay with the QSFP to go with them, and if you have a place to put a switch that doesn't matter if it's noisy like in a wiring closet somewhere, cheap 1U switches with 40GbE ethernet ports on them that can also be used as individual 10GbE when broken out.
if you get a $200 switch with a few 10GbE interfaces in it you can easily expand things in the future by trunking vlans to another newer 10GbE capable switch, or connecting to a switch that has multi-gig copper ports for access ports to 2.5/5GBaseT capable desktop PCs and laptops, etc.
$40 for a 10 meter fiber optic cable is a high price when you can buy LC-LC UPC 9/125 duplex 2 meter cables for $3.50 to $4.70 a piece (or a few cents more for additional meters) and connect them between $20 transceivers. no matter what route someone goes with would recommend buying $30-40 of basic fiber connector cleaning supplies.
https://www.fs.com/products/40192.html?attribute=193&id=3026...
if one wants to buy used weird previous gen dead-end stuff there are also tons of very cheap 40GbE mellanox ethernet adapters on ebay with the QSFP to go with them, and if you have a place to put a switch that doesn't matter if it's noisy like in a wiring closet somewhere, cheap 1U switches with 40GbE ethernet ports on them that can also be used as individual 10GbE when broken out.