The optical power versus current relationship for a LED is given byP- 0.02 x i. The maximum allowed power is 10 mW. The LED has a de bias corrent and

a 1-MHz ac current applied. (a) Sketch the power-current curve(this is the diode's transfer characteristic). (b) ł the peak signal power is 2 m Wand the peak total power is 10 mW,compute the total peak current,the de bias current, the average optical power, and the modulation index (peak signal power)/(average 6-power). (c) Repeat if the modulation index is now 100% (and the peak signal power is no longer 2 mW).i (d) Let the de current be 50 mA and the peak ac current be 75 mA. Plot the output power versus time for two cycles of the ac signal.