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NCTI Exam Fiber II Question and answers correctly solved 2023
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NCTI Exam Fiber II Question and answers correctly solved 2023
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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.
Besides protection, what else must the coating on an optical fiber do? - correct answer
Function over a wide temperature range; be compatible with cable gels; adhere to the
glass cladding over the lifetime of the cable; and be mechanically strippable for splicing
operations.
How do technicians know the specific type of single-mode fiber used in a particular
project? - correct answer They have read the project's specification records.
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