Then you hook them up with just one fibre strand (instead of the usual 2).
You obviously can't use TCP over that since that requires a 2-way connection, but UDP works just fine. You'll probably want to wrap your data in some error correcting code, too.
You get a couple of these Ethernet to 100FX converters: http://antaira.com/products/media-converters/unmanaged-conve...
Then you hook them up with just one fibre strand (instead of the usual 2). You obviously can't use TCP over that since that requires a 2-way connection, but UDP works just fine. You'll probably want to wrap your data in some error correcting code, too.