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The optical power at 20 MHz is 246.2 μW. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns.

The optical power at 20 MHz is 246.2 μW. Determine dc drive current applied to device with carrier recombination lifetime for LED of 6ns. Correct Answer 3.48*10-4

The optical output power at 20 MHz is Pe(20 MHz) = Pdc/(1+(WTi)2)1/2 246.2*10-6 = Pdc/(1+(2π*20*10-6*5*10-9)2)1/2 Pdc = 3.48*10-4.

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