The two diodes on the One for All 6 are both conventional 940nM diodes (neither is 880nM like IrDA specifies). The reason for using a two diode set-up like this in remotes is to provide a combination of good range and good off-center performance. One diode will usually be wide angle and the other narrow angle. Kinda like driving with your foglights and high beams on at the same time. But neither are to IrDA spec.

I suppose if you wanted to get really adventuresome, you could buy an 880nM diode (Radio Shack, for one, sells them) and replace one of the OFA6 diodes yourself. But they don't come that way from One for All.