TECHNICAL PRESENTATIONON

OPTO ELECTRONICS

ContentsIntroductionAdvantagesDevices TypesApplication

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.

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

Opto Electronic Devices TypesPhoto Diodes Solar CellsPhoto TransistorsPhoto MultipliersLaser Diodes

Optical DevicesLED, LDR, PHOTO TRANSISTORS

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

Laser DiodeA laser is a device that emits light through a

process of optical amplification based on the stimulated emission of electromagnetic radiation

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.

MultiplexingTime-Division Multiplexing (TDM)

E.g. Telephone linesFrequency-Division Multiplexing

E.g. FM radio

Application Compact Disc PlayersSmoke Detectors,Infrared Remote Control Devices Astronomy, Spectroscopy, Night Vision

Equipment And Laser Range Finding.Pharmacy

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