Opto Electronics
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Transcript of Opto Electronics
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TECHNICAL PRESENTATIONON
OPTO ELECTRONICS
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ContentsIntroductionAdvantagesDevices TypesApplication
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IntroductionOptoelectronics 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.
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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 electronicsystems
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Opto Electronic Devices TypesPhoto Diodes Solar CellsPhoto TransistorsPhoto MultipliersLaser Diodes
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Optical DevicesLED, LDR, PHOTO TRANSISTORS
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LEDForward biased junctionCurrent flows from n side to the p sideBand Gap or Energy Gap (EG): Difference of
energy between the conduction band and valance band
Wavelength of emitted light depends on EGMost widely used material for visible spectrum:
GaAs, GaP, and GaAsP
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Laser DiodeA laser is a device that emits light through a
process of optical amplification based on the stimulated emission of electromagnetic radiation
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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.
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MultiplexingTime-Division Multiplexing (TDM)
E.g. Telephone linesFrequency-Division Multiplexing
E.g. FM radio
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Application Compact Disc PlayersSmoke Detectors,Infrared Remote Control Devices Astronomy, Spectroscopy, Night Vision
Equipment And Laser Range Finding.Pharmacy
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THANK YOU