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NCTI exam 2023 with 100% correct answers
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NCTI exam 2023 with 100% correct answers
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NCTI Exam Fiber IIWhy was the zero-dispersion point in single-mode fiber moved to 1,550 nm? - correct answer -To take
advantage of the low intrinsic absorption and lower attenuation at 1,550 nm in single-mode fiber.
What type of single-mode fiber is intended for fiber-to-the-home (FTTH) installations? - correct answer -
The ITU-T G.657 bend-insensitive fiber (BIF).
What are the primary causes of intrinsic loss in single-mode fiber? - correct answer -Material absorption
and Rayleigh scattering.
The phenomenon, total internal reflection, is what enables an optical fiber to guide light. What
characteristic of optical fiber causes total internal reflection? - correct answer -The difference in
refractive indexes, between cladding and core, causes light to be reflected off the cladding and back into
the core along the optical fiber.
Where would you expect Fresnel reflections to occur in a fiber-optic network? - correct answer -At
connections and mechanical splices where the signal source is entering or exiting the cable.
Chromatic dispersion is a combination of which two dispersions? - correct answer -Material and
waveguide dispersion.
What is one advantage and one disadvantage of single-mode fiber with a large mode field diameter
(MFD)? - correct answer -The larger the MFD, the easier it is to splice and connectorize the fiber,
although it becomes more sensitive to bending losses.
What is the current standardized outside diameter (OD) of the cladding of single-mode fiber? - correct
answer -It is 125 μm, with an accuracy of ±1 μm.
What do diameter differences between spliced fibers look like on an optical time domain reflectometer
(OTDR)? - correct answer -Gain in one direction and high loss in the opposite direction.
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