# Answer to Question #45488 in Other Engineering for Golden Young

Question #45488

1. A LED optical source operating with a current of 100 mA generates light at a

wavelength of 1.3 μm, with a total quantum efficiency of 0.02. The diode obeys the

normal diode equation I = I(s)[exp(V/V(T)) – 1], where V(T) = 0.026 V = kT/q is the thermal

voltage. When reversed biased, the diode is found to have a reverse saturation current

of 1 pA.

Calculate the power efficiency of this diode, defined as the optical output power

divided by the electrical input power.

wavelength of 1.3 μm, with a total quantum efficiency of 0.02. The diode obeys the

normal diode equation I = I(s)[exp(V/V(T)) – 1], where V(T) = 0.026 V = kT/q is the thermal

voltage. When reversed biased, the diode is found to have a reverse saturation current

of 1 pA.

Calculate the power efficiency of this diode, defined as the optical output power

divided by the electrical input power.

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