Michael Rahaim, PhD Candidate Multimedia Communications Lab

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Presentation transcript:

MODULE 5: Photodiodes and VLC SUMMER CHALLENGE Electrical Engineering: Smart Lighting Michael Rahaim, PhD Candidate Multimedia Communications Lab Boston University mrahaim@bu.edu

Overview Photodiodes Integrated Circuits (ICs) 07/10/2015 Overview Photodiodes Integrated Circuits (ICs) Visible Light Communication Experiment Optical Channel Optical Signaling

07/10/2015 Photodiodes Current is generated proportional to the received optical power Responsivity [A/W] is a function of wavelength

Integrated Circuits Current mirrors (red) 07/10/2015 Integrated Circuits 3 2 4 7 6 Current mirrors (red) Differential amplifier (blue) Gain stage (magenta) Voltage level shifter (green) Output stage (cyan)

Experiment I Photodiode Circuit Optical Channel 07/10/2015 Experiment I Photodiode Circuit Optical Channel LEDs have an angle dependent emission pattern Photodiodes also have an dependent response Distance relates to signal attenuation Multipath attenuates AND adds time dispersion Tx Rx

07/10/2015 Experiment II Optical Signal between PCs

07/10/2015 Recap What did you today?