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Opto Electronics

Opto Electronics is a study and application of electronic devices that source and detect and control light usually considered a sub field photonics

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Opto Electronics

  2. 2. Contents  Introduction  Advantages  Devices Types  Application
  3. 3. Introduction  Optoelectronics is the study and application of electronic devices that source, detect and control light, usually considered a sub-field of photonics  Light often includes invisible forms of radiation such as gamma rays, X- rays, ultraviolet and infrared, in addition to visible light. Optoelectronic devices are electrical-to-optical or optical-to-electrical transducers, or instruments that use such devices in their operation.
  4. 4. Why Is Optoelectronics Important?  Compared to copper wire, optical fibers cost less, weigh less, have less attenuation and dispersion and provide more bandwith.  Highly used in electronic systems
  5. 5. Opto Electronic Devices Types  Photo Diodes  Solar Cells  Photo Transistors  Photo Multipliers  Laser Diodes
  6. 6. Optical Devices LED, LDR, PHOTO TRANSISTORS
  7. 7. LED  Forward biased junction  Current flows from n side to the p side  Band Gap or Energy Gap (EG): Difference of energy between the conduction band and valance band  Wavelength of emitted light depends on EG  Most widely used material for visible spectrum: GaAs, GaP, and GaAsP
  8. 8. Laser Diode  A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation
  9. 9. Phototransistors Phototransistors is an NPN bipolar transistor with an exposed base region. Here, light striking the base replaces what would ordinarily be voltage applied to the base.
  10. 10. Multiplexing  Time-Division Multiplexing (TDM)  E.g. Telephone lines  Frequency-Division Multiplexing  E.g. FM radio
  11. 11. Application Compact Disc Players Smoke Detectors, Infrared Remote Control Devices Astronomy, Spectroscopy, Night Vision Equipment And Laser Range Finding. Pharmacy
  12. 12. THANK YOU