Improving OOK Modulation Rate of Visible LED by Peaking and Carrier Sweep-Out Effects Using ${n}$ -Schottky Diodes-Capacitance Circuit

P. Binh (1) , V. Trong (1) , Pierre Renucci (2) , Xavier Marie (2)

1 Institute of Materials Science, Vietnam Academy of Science and Technology
2 LPCNO - Laboratoire de physique et chimie des nano-objets

In this paper, we present an improvement for LED driver circuit by inserting a threshold voltage on the resistive branch of the conventional RC current-shaping circuit. The proposed method enhances the peaking and carrier sweep-out effects in the LED's active region when the electrical pulse is turned on and off, respectively, thereby the LED modulation rate can be greatly improved. A practical implementation of the transmitter using Schottky diodes to provide the threshold voltage and an off-the-shelf AlGaInP 660 nm RC-LED is reported. We demonstrate an error-free data transmission at the rate of 500 Mbit/s over 20 m step-index POF

Mots clés: Light emitting diodes; Schottky diodes; Optical pulses; Modulation; Optical transmitters; Bandwidth; Threshold voltage

Domaines: Chimie

P. Binh, V. Trong, Pierre Renucci, Xavier Marie. Improving OOK Modulation Rate of Visible LED by Peaking and Carrier Sweep-Out Effects Using ${n}$ -Schottky Diodes-Capacitance Circuit. Journal of Lightwave Technology, 2013, 31 (15), pp.2578-2583. ⟨hal-02050435⟩