Answer to Question #45248 in Engineering for Golden Young

Question

1) According to theoretical characteristic of a LED and using direct modulation, if an input
signal is a sine wave, what would the output signal be?
2) If receiving optical powers for the red and green channel are 200 micro-watt, and a same
photodiode is used for both channels, calculate currents received by both channels.

Answer 1

1. LED works as current rectifier which passes current only in one direction. Thus, the output signal is a sine wave without negative halfwave.

2. There is no enough information for solving.