Fiber Optics
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Fiber Optics

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Fiber Optics Fiber Optics Presentation Transcript

  • FIBER OPTICS
  • Principle and propagation of light in optical fibers
  • Total internal reflection
  • Numerical aperture and Acceptance angle
    Numerical aperture / Light collecting capacity
    NA = ( n12 - n22 ) ½
    Acceptance angle = Sin -1 (NA)
  • Types of optical fibers
    Material
    Mode
    Refractive index profile
  • Material
    Glass fiber
    Plastic fiber
  • Glass fiber
  • Plastic fiber
    core cladding
    polyurethene methyl methacrylate
    Poly methyl metha co-polymer
    crylate
  • Mode
    Single mode
    Multi mode
  • Multimode
  • Refractive index profile
    Step index
    Graded index
  • Double crucible technique of fiber drawing
    Platinum crucible
  • Fiber manufacture
  • Splicing
  • connector
  • Loss in optical fiber
    Attenuation coefficient
    Po is the power emitted from the source fiber
    Pi is the power accepted by the connected fiber
  • Dispersion
    Dispersion
    chromatic
    intermodal dispersion
  • Bending loss
  • Fiber optical communication system (Block diagram)
  • Light sources
    LED
    LASER
  • LED
  • LASER
  • Detectors
    PHOTO-DIODE
    P-I-N DIODE
  • Photo diode
    When a photon of sufficient energy strikes the diode, it excites an electron, thereby creating a mobile electron and a positively charged electron hole.
  • Photodiode
  • P-I-N diode
    The intrinsic "i" region is flooded with charge carriers from the "p" and "n" regions.
    Its function is similar to filling up a water bucket with a hole on the side. If,water reaches the hole's level it will begin to pour out.
    Similarly the Pin diode will conduct where the number of electrons is equal to the number of holes in the intrinsic region
  • Fiber optic sensors – temperature & displacement
  • Endoscope