TTMER19: OTDR - Optical Time Domain Reflectometer

Control questions

You must give an answer to 5 questions at the beginning of the laboratory exercise. One wrong answer will make the mark given to the measuring with one grade worse. Two or more wrong answers will result a supplementary measuring! You will not find any answers in the aid for questions with subject of circuit diagrams! We would like to learn about the creative abilities of students here.

  1. Give the wavelengths of the three optical window.
  2. What is the physical background of the Rayleigh scattering?
  3. What is Fresnel reflection? How much is the general value of it in case of polished fibre?
  4. How does the absorption attenuation affects the whole fibre attenuation being measured?
  5. At 1550 nm, or at 1300 nm would be the fibre attenuation bigger? Why?
  6. What sort of factors affects the resolution?
  7. What is dead zone?
  8. When can radiation loss appear?
  9. What is the definition of the dynamic range?
  10. Draw the block scheme of OTDR.