Fiber Optics

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Fiber Optics

  1. 1. FIBER OPTICS<br />
  2. 2. Principle and propagation of light in optical fibers <br />
  3. 3.
  4. 4.
  5. 5. Total internal reflection<br />
  6. 6. Numerical aperture and Acceptance angle <br />Numerical aperture / Light collecting capacity <br /> NA = ( n12 - n22 ) ½<br />Acceptance angle = Sin -1 (NA)<br />
  7. 7. Types of optical fibers <br />Material <br />Mode<br />Refractive index profile<br />
  8. 8. Material<br />Glass fiber<br />Plastic fiber<br />
  9. 9. Glass fiber<br />
  10. 10. Plastic fiber<br />core cladding<br />polyurethene methyl methacrylate<br />Poly methyl metha co-polymer<br />crylate<br />
  11. 11. Mode<br />Single mode <br />Multi mode<br />
  12. 12.
  13. 13. Multimode<br />
  14. 14. Refractive index profile<br />Step index <br />Graded index<br />
  15. 15.
  16. 16. Double crucible technique of fiber drawing<br />Platinum crucible<br />
  17. 17. Fiber manufacture<br />
  18. 18. Splicing<br />
  19. 19. connector<br />
  20. 20. Loss in optical fiber <br />Attenuation coefficient<br /> Po is the power emitted from the source fiber <br /> Pi is the power accepted by the connected fiber<br />
  21. 21. Dispersion<br />Dispersion <br /> chromatic <br /> intermodal dispersion <br />
  22. 22. Bending loss<br />
  23. 23. Fiber optical communication system (Block diagram) <br />
  24. 24. Light sources <br />LED<br />LASER<br />
  25. 25. LED<br />
  26. 26.
  27. 27. LASER<br />
  28. 28. Detectors <br />PHOTO-DIODE<br />P-I-N DIODE<br />
  29. 29. Photo diode<br />When a photon of sufficient energy strikes the diode, it excites an electron, thereby creating a mobile electron and a positively charged electron hole.<br />
  30. 30. Photodiode<br />
  31. 31. P-I-N diode<br />The intrinsic "i" region is flooded with charge carriers from the "p" and "n" regions.<br />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.<br />Similarly the Pin diode will conduct where the number of electrons is equal to the number of holes in the intrinsic region<br />
  32. 32.
  33. 33.
  34. 34. Fiber optic sensors – temperature & displacement<br />
  35. 35. Endoscope<br />
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