Fiber Optics by LTj6P051

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									Fiber Optics
By: Herlina Lim
Chem 323
Analytical Instrumentation
Chronological History

  In 1870  John Tyndall demonstrated
  that light follows the curve of a stream
  of water pouring from a container.
  In the 1950's  more research and
  development into the transmission of
  visible images through optical fibers.
  In 1966  Charles Kao and George
  Hockham proposed the transmission of
  information over glass fiber.
What is Fiber Optic?

  A thin and very fine
  strand of glass or
  plastic that carries
  light transmissions
  over long distance.
Three main parts of Fiber optics

  1st part : Core (placed in
  the centre of the fiber.
  This is where the light
  will travel)
  2nd part : Cladding
  (outer optical material
  that reflects the light
  back into the core)
  3rd part : Buffer Coating
  (plastic coating that
  protects the fiber from
  damage and moisture)
The principle : Total Internal Reflection


   Lights travel through the
   core by constantly
   reflecting from the
   cladding as the angle of
   incidence always
   greater than critical
   angel.
   Since cladding does not
   absorb any light from
   the core, the light wave
   can travel great
   distances.
Fiber-Optic Relay System




 Optical Transmitter : produces light signals
 Fiber optic cable : conducts the signals
 over a distance
 Optical Receiver : receives the light
 signals
Two types of fiber optic cable
   Single Mode Fiber
• one mode of transmission
• Carry higher bandwidth than
  multimode fiber but requires
  a light source with a narrow
  spectral width
• Used in telephones and cable TV
   Multi Mode Fiber
• Multiple mode of transmission
• In long cable runs, multiple paths
   of lights can cause signal distortion
   at the receiving end  unclear and
   incomplete data transmission
• Used in computer networking
Advantages compare to copper wires


 Less expensive
 Thinner
 Higher carrying capacity
 Light and digital signals
 Low power
 Non-flammable
 Flexible


                             Coiled Copper Wire Rod
Bronchoscopes




 Bronchoscope
References
 http://www.xpressindia.com/White_pape
 rs/how_fiber_optics_work.htm
 http://www.datacottage.com/nch/fibre.ht
 m
 http://www.nlm.nih.gov/medlineplus/enc
 y/imagepages/9138.htm
 http://www.emedicinehealth.com/articles
 /11603-8.asp

								
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