The usual cost of converters like this is quite high. This would be for those special use-cases (remote server/client VM setups etc), I'm in two minds to grab it myself and keep it in the parts cupboard for future use, unless someone here could do with one right now in which case this is an absolute bargain.
LINDY Fibre Optic USB 3.0 Cable. 70m | eBay
Fibre Optic USB 3.0 Cable, 70m. Lindy User Manual. USB 3.0 Active Optical Cable (AOC), compliant with SuperSpeed USB electrical specifications. USB Type A/Micro-B Cable.
www.ebay.co.uk