block4.6.txt

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ralowery
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block4.6.txt
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2014-05-06 20:23:24
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block4.6
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    • author "me"
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    • description "block4.6"
    • fileName "block4.6"
    • What are four Intrinsic Coupling Losses?
    • numerial aperture
    • core diameter mismatch
    • concertricity loss
    • ellipticity
  1. What are four Extrinsic Coupling Losses?
    • end separation
    • axial/lateral misalignment
    • angular misalignment
    • surface finish
  2. What is scattering?
    the partial deflection of light rays as they travel along the fiber core
  3. What type of scattering is responsible for 90% of all attenuation?
    rayleigh scattering
  4. What is the second leading cause of attenuation?
    absorption
  5. What is fiber dispersion?
    is the speading of light pulses as they travel down the optical fiber
  6. What type of dispersion effects both single mode fiber and multi-mode fiber?
    chromatic dispersion
  7. What is the difference between a microbend and macrobend?
    • microbends are microscopic imperfections caused by local mechanical damages and can't be seen by the human eye
    • macrobends are large bends that can be seen by the human eye
  8. What should be worn at all times when working with cable, fiber, and/or chemicals?
    safety glasses
  9. what is intrinsic coupling losses
    are caused by inherent fiber characteristics
  10. what are the three primary types of scattering
    • rayleigh
    • stimulated brillouin
    • stimulated raman
  11. what does SRS stand for
    stimulated raman scattering
  12. what does SBS stand for
    stimulated brillouin scattering
  13. what are the different types of dispersion
    • modal dispersion
    • chromatic dispersion
    • polarization mode dipersion
  14. what does PMD stand for
    polarization mode dispersion
  15. what type of dispersion effects single mode fiber
    polarization mode dispersion PMD
  16. what type of dispersion effects multi-mode fiber
    modal dispersion
  17. What are the three types of fiber optic test cables needed to test for serviceability?
    • ST-ST fiber optic test cables
    • LC-ST fiber optic test cables
    • LC-LC fiber optic test cables
  18. What does FOM stand for?
    fiber optic meter
  19. What does the DSP-FOM?
    is an optical power loss meter that provides fiber testing capabilities for the fluke etherscope series II network assistant
  20. What source type is used by the DSP-FOS?
    fiber optic light emitting diode power source
  21. What type of optical adapter is used with the DSP-FOS?
    ST
  22. What emitter type does the Fluke LS-1310/1550 Optical Light Source use?
    • emitter type
    • LASER
  23. What are the output wavelengths of the Fluke LS-1310/1550 Optical Light Source?
    • 1310 nm +- 20nm
    • 1550 nm +- 30nm
  24. What are the two pulse duration settings of the Fluke LS-1310/1550 Optical Light Source?
    • continuous wave CW
    • modulating wave MOD
  25. What type of cable is used to connect the DSP-FOM to the Fluke EtherScope?
    known good Cat 5e
  26. What is used to connect the two fiber optic test cables together during a serviceability test?
    coupler
  27. What is the dB loss limit set to?
    3dB
  28. what does CW stand for
    continuous wave
  29. what does MOD stand for
    modulating wave
  30. what does FOS stand for
    fiber optic source
  31. What fiber optic source is used to test ST-ST Single-Mode multiple strand fiber optic cable?
    FLUke 1310/1500 fiber optic source
  32. What is used to connect the two fiber optic test cables?
    COUPLER
  33. What is the Loss Budget set to on the Fluke EtherScope Series II Network Assistant when testing fiber optic cable?
    3dB
  34. When is the wavelength used to measure a Single-Mode LC-LC fiber optic cable?
    when you turn on the DSP-FOM
  35. What does OTDR stand for?
    optical time domain reflectometer
  36. How does an OTDR measure for loss?
    an instrument that analyzes the light loss in an optical fiber
  37. What can an OTDR be used determine within a fiber optic network?
    the location of the errors
  38. What type of screen do OTDR’s use to display test results?
    LED
  39. What is a Dead Zone?
    exceptionally high signal reading for the initial 1 to 10 meters of the fiber optic cable
  40. What is an End of Fiber Spike?
    exceptionally high signal reading caused by light reflecting off the mirror-like polished end of the optical fiber
  41. What is the Ghost?
    • often called a phantom signal
    • a faint, second image of a stronger, preceding signal caused by reflection
  42. What is noise?
    • referred to as the noise floor
    • continuation of an OTDR measurement that results in an OSNR level so low, the unit cannot determine if there is more optical cable present
  43. What does VFL stand for?
    • visifault
    • visual fault locator
  44. What is the purpose of the Fluke Visifault?
    is a visible light source that helps trace optical fibers, check fibers continuity, and find faults such as breaks, bad splices, and tight bends in fiber optic cable
  45. What class of laser does the Fluke Visifault utilize?
    class 2 laseer
  46. What type(s) of fiber is the Fluke Visifault used with?
    • mutlimode
    • singlemode
  47. When the Fluke Visifault locator is not in use, what safety precaution is taken?
    cover the VFL's output with the dust cap
  48. What type of connectors does Fluke Visifault’s universal fiber adapter accept?
    2.5mm ferrules (SC ST FC)
  49. what are the four things on the VFL
    • VFL's output
    • power button
    • flash key
    • status LED

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