If you only need a short distance, try the TORX/TOTX something optocouplers from Toshiba (and others). I will find the exact part number. Then you can use the standard fiber optic cable used in Hi-Fi systems.
I remember once, Elektor had an opto-isolated tranceiver with such cables and RS-232 ports.
Ioannis
Well I found some more infos. The chips could be the TODX294, TODX296, TDX298, TORX176, TOX176, TOTX194
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