1. The Transistor Laser

2. History 1947 1947 John Bardeen and Walter H. Brattain John Bardeen and Walter H. Brattain Created emitter Created emitter Make possible our digital styles Make possible our digital styles Cellphones, PC, MP3 players Cellphones, PC, MP3 players

3. What comes next? Transistor Laser Transistor Laser Provide much faster broadband communication Provide much faster broadband communication In telecommunications network In telecommunications network Within and between chips Within and between chips

4. University of Illinois at Urbana Champaign University of Illinois at Urbana Champaign On and off more than 700 billion times per second On and off more than 700 billion times per second Both electrical signals and a laser beam Both electrical signals and a laser beam Broadband improvement Broadband improvement 100 billion bits per sec = 3 DVD 100 billion bits per sec = 3 DVD

5. Advantages 1.Process data with light instead of electricity. 2.Faster broadband communication 3.Input electrical signals  output electrical & optical 4.Integrate transistor lasers into devices and route out signals 5.Ways to exploit fast transistors that output signals in two different modes simultaneous

6. 1992 at Interuniversity MicroElectronics Center in Leuven, Belgium 1992 at Interuniversity MicroElectronics Center in Leuven, Belgium Indium-gallium-arsenide bipolar transistor Indium-gallium-arsenide bipolar transistor Emitted light in liquid nitrogen temperature Emitted light in liquid nitrogen temperature

7. 1980s 1980s California Institue of Technology, in Pasadena California Institue of Technology, in Pasadena Graduate student Joseph Katz Graduate student Joseph Katz Translasers Translasers Produce both electical signal and laser beams Produce both electical signal and laser beams Not both simultaneously Not both simultaneously

8. What can transistor laser do? Computer sends an signal to optical transmitter Computer sends an signal to optical transmitter Convert into pulses of light Convert into pulses of light Use data to generate 1s and 0s Use data to generate 1s and 0s Travel on beam through glass fiber Travel on beam through glass fiber Photodetectors read and converts the data Photodetectors read and converts the data Back to electrical data Back to electrical data

9. How it works?

11. Future Instead of indium phosphide and indium-gallium-arsenide Instead of indium phosphide and indium-gallium-arsenide Use Indium-gallium-phosphide and gallium arsenide Use Indium-gallium-phosphide and gallium arsenide Cheaper to work with Cheaper to work with Instead of record breaking 700billion maybe 100 billion bit per second Instead of record breaking 700billion maybe 100 billion bit per second

12. But it won’t be long But it won’t be long No need for an entirely new fabrication infrastructure No need for an entirely new fabrication infrastructure U.S. Defence Advanced Research Projects Agency is funding U.S. Defence Advanced Research Projects Agency is funding Wont be too long Wont be too long

13. Problems Need it to work in room temperature Need it to work in room temperature Figure out how to integrate transistor laser into devices Figure out how to integrate transistor laser into devices Come up with ways to output signals in two different mode at same time Come up with ways to output signals in two different mode at same time

14. Thank You …..

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