10G-SR or 10G-LR is what you can use. you could use LRM but thats kinda the "odd one no one ever uses"
Depending on the MMF you use.. OM4 ranges 400M, OM3 is 300M OM2 is 82m om1 is 33 meters.
LR will do 10km without any problems
SR/LR are LED based optics where the ER/ZR are actual laser based iirc.
Third party optics will be generally 1/3rd the price of cisco optics. There are a slew of quality optics that come out of HK that work great with cisco. Might have to do the hidden service support-unsupported command but they should work fine as long as they are also coded for cisco in the eeproms.
you could use LRM but thats kinda the "odd one no one ever uses"
I agree if that I were just buying an optic or two, I'd go SR just for future interop reasons. The LRM optics are great for interconnecting Cisco gear that support them, but even Cisco doesn't support LRM across all their product lines. In particular, the Nexus 5ks and 2ks have no ASIC support for the LRM SFP+.
All that said, for interconnecting our Nexus 7ks and 6500s we use LRM optics exclusively. When you're ordering a few hundred 10gig optics, the savings of LRM are completely worth it.
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How are the cross connects delivered? Probably single mode.
If your not on 10gig now you probably will be one day?
Why hassle with OM2, OM3, etc. single mode will be here for the long haul (no pun intended) for your future expansion. If you go with LR optics for your short runs too you only have one spare part to stock, all of your cables are interchangeable and have a longer shelf life, etc. Just remember to attenuate the LR optics on such a short run.
You can buy a programmer to use the optics in various brand devices as well.
What is the difference between 50MMF and 62.5MMF in the SR optics?
Its the size of the core. 50 micron vs 62.5 micron. OM3 is narrower. In laymans terms the narrower the core the more direct the light path (and less paths the light can take) this means the narrower the core the more efficient the fiber. Once you get to 9 microns (the size of the core in single mode) there is only one path the light can take making it more efficient so the same amount of photons will travel further. (Its not quite like I describe but it is a very good analogy.)
Personally if the run is to big for twinax copper I use single mode. (Even for short distances) I have relegated anything multi mode to the scrap heap.
To learn all about fiber go to the following link and work your way over the table starting at Jargon: