1. O PTICAL V OICE AND DATA TOOLKIT Neil Gandhi Chris Hunold Alex Grubl Georgia Institute of Technology ECE4007 L03 Senior Design December 20, 2009

2. P ROJECT O VERVIEW Use FSO communication to transmit voice, data Provide secure alternative to radio frequency Applied to military applications Cost of $894.60 for parts

3. P RIMARY O BJECTIVES Communicate at distance of 20 meters Transfer data at rate of 2 Mbps Use eye-safe/covert light for communication Demonstrate proof of concept of technology

4. O VERALL D ESIGN A PPROACH

5. E NCODING V OICE AND D ATA

6. D ATA F RAMING FOR T RANSMISSION Framed layout of data

7. D ECODING V OICE AND D ATA

8. E NCODING /D ECODING P ROBLEMS Manipulating hardware Combining voice & data Reduce bit error rate

9. F REE S PACE O PTICAL TRANSMISSION Current to voltage Amplifier chip Gain of 1000

10. A MBIENT L IGHT

11. F REE S PACE O PTICAL D ETECTION Frequency = 1 MHz Period = 1 µs Amplitude = 3.3 Vp-p

12. D EMONSTRATION P LAN Transmit unaltered voice from DE2 board ‘A’ to board ‘B’ Display image from SD card on LCD screen of DE2 board ‘B’

13. P ROJECT S CHEDULE Encoding/decoding of voice and data Short-range signal detection Short-range communication Long-range signal detection Long-range communication

14. C URRENT P ROJECT S TATUS Short-range signal detection Working on encoding/decoding of voice and data

15. F REE S PACE O PTICS Line-of-sight technology using beams of light to enable fiber-optic connectivity without physical wires. ~www.freespaceoptics.org