Yes Carlos, for Fibre NICs communicating on 1Gb, they would not communicate with a 10/100MB device which basically applies to almost all the fibre channel devices however if you can send us the exact product code, I will be better able to guide you.
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Yes, that is correct, they use different wavelengths of light so it's a physical impossibility to get them to talk to each other. You can read more about this on Wikipedia, http://en.wikipedia.org/wiki/100base-FX#100BASE-FX and http://en.wikipedia.org/wiki/Gigabit_Ethernet#1000BASE-SX