Fiberoptic cable uses pulses of light to transfer information. To replace it with copper cable you will need a conversion box at each end to transform the pulses of light to electrical
pulses then back again at the other end.
The fibre optic cable should not be very specific. It relies on total internal reflection so any optic cable ( basically just a flexible glass or plastic rod) that physically fits should work
. Some high end HiFi systems use fiber optic cable between the CD player and decoder. The cables
are also used in telecommunications, so you may be able to pick up something on eBay.
If you can cut the cable at the break and physically fit it into the receiver it may work
. It's only transmitting pulses of light so if the receiver can see the pulses it should work.