An investigation on the influence of electromagnetic interference induced in conducting wire of universal LEDs

Electromagnetic Interference (EMI) has a detrimental effect upon the performance of Optical-Fiber Communication (OFC) systems. The present study considers the case where EMI is induced in a conducting wire (CW), and derives equations to establish the influence of the induced EMI on GaP and GaAsP Light-Emitting Diodes (LEDs). These equations are then verified experimentally. The results indicate that the degree of influence of the EMI upon both LED devices depends upon the interference power, the interference frequency, the induced power, the input resistance of the device, the inverse saturation current, and the ideal factor of the LED. Moreover, it is found that the induced interference current increases with an increasing interference frequency and that the EMI has a greater influence on devices with a lower input impedance. The theoretical results are found to be in good agreement with the experimental data.