The Transistor Laser

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The Transistor Laser

• Kyle Chen
• CS122b
• 2/13/07

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History

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

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What comes next?

• Transistor Laser
• Provide much faster broadband communication
• In telecommunications network
• Within and between chips

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

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

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

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What can transistor laser do?

• Computer sends an signal to optical transmitter
• Convert into pulses of light
• Use data to generate 1s and 0s
• Travel on beam through glass fiber
• Photodetectors read and converts the data
• Back to electrical data

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How it works?
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Future

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

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• But it wont be long
• No need for an entirely new fabrication
  infrastructure
• U.S. Defence Advanced Research Projects Agency is
  funding
• Wont be too long

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Problems

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