A passive optical splitter. With shorter cable runs that works.

Nobody? How do you set up your MADI equipment for recording on two PCs, for safety reasons?

Hello,

A - As MC said an optical splitter can be used even with longer fiber but only on the input side, not the output side.  The output sides need to be short to prevent excessive reflections back to the splitter but the input side can be longer.  Note that when you add a longer fiber to the input side the optical level will be attenuated slightly through the fiber butt meaning the optical receivers in the Madiface will not be able to receive at some attenuation level.  You'll need to experiment and, of course, you have fiber cleaners, correct?
Note that optical receivers have a light budget, meaning they'll successfully resolve optical power levels between certain limits which is why a splitter can work.
Also note that the duplex SC ports on the Madiface are multi-mode (unless you've replaced them with single-mode as we have) so be sure your fiber and splitter are multimode.

B - if you have access to electrical (coax) Madi connections, a high bandwidth analog video DA can function as a Madi DA.  Many analog DAs have bandwidths of 200MHz or better and work well for Madi.  Note that Madi is VERY susceptible to ground loop issues, far more than SDI video, so if your gear is separated that can be a problem.

C - Buy a used Madi Bridge or whatever it's called.

Hugh

Here in the Netherlands the google search term Optical Splitter gives many useful hits.

Thanks, Georg, but these products don't have an input socket (female connector) for my 50m cable (from stagebox), do I see this right? Is there such a thing with a female connector for input and two outputs (for output male connector is possible)?
How do you apply these products in your setup?

That's TOSLINK, that's for ADAT but doesn't fit for MADI.