Visible Light communication

By ASHWIN SHENOY M

Seminar on

OutlineIntroduction

Motivation

Working Technology

VLC vs RF

Disadvantages

Application

Conclusion

IntroductionLighting is a major source of electric energy consumption.

Visible light communication is a data communications medium using visible light between 380nm-700nm.

VLCT is Developed by the Visible Light Communication Consortium (VLCC) in Japan. VLCC contributes to research, development and standardization of VLC

Japan Electronics and Information Technology Industries Association (JEITA) issued two visible light standards JEITA CP-1221 and JEITA CP-1222, based on VLCC suggestion.

MotivationI. Now, researchers came to realize that

WLED devices could also be used for wireless purposes.

II. LEDs are cheaper than RF.

III. security and safety is more.

IV. RF radiation in hospital and airplane will be vanished .

V. Large amount of energy can be saved.

Working Technology

Data Light source

Modulation

(PPM/FSK)

DataDemodulatio

n(PPM/FSK)

PD or CCD

Simple example for VLC

Passing the sticky note from one pc to

another pc.

Transmitter/receiver of VLCVisible light LED

Fluorescent lamp

PIN photo diode

Image sensors

VLC vs. RF CharacteristicsProperty VLC RF

Visibility Yes No

Bandwidth Unlimited, 400nm~700nm

Regulatory, BW Limited

EMI or RFI  No High

Security more Less comp. to VLC

Power Consumption

Relative low Medium

Coverage Distance

Harmless for human body

Short

NO

Medium

YES

Disadvantages 1.LOS Communication: requires line of

sight communication.

2.Short Range: This technology usually works over a short distance range.

Applications1. Under water communication system

2. hospitals

Applications (contd)3. Inside airplane communication

4. Vehicle to vehicle messaging

5. Indoor broadcasting system.Applications

(contd)

APPLICATIONS (CONTD)

6.Application of visible light communication to Intelligent Transport System

Conclusion and outlookThere are many application that can be realized

using Visible Light Communication. Careful consideration will be needed to introduce it into a market.

Questions ?

THANK YOU