Don't have a multi-mode fibre cable long enough, but you have got a single-mode cable? Not got any single-mode (long reach) transceivers?
Well, you might be in luck. You may be able connect a pair of short wave (850 nm multi-mode) transceivers with single-mode 9/125 cable and have it work.
In this video, I demonstrate a 20 m SM cable carrying 850 nm. The transceivers are Intel 4 GB multi-rate FC SFPs.
Note that this is not reliable. An identical pair of transceivers with the same cable got a link-up indication, but severe packet loss.
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