NCTI Fiber Install & Activation Exam with precise answers

NCTI Fiber Install & Activation Exam with precise ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




answers


Terms in this set (120) ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Original

Which standards organization is considered the creator of the world's most recognized
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communications standards, known as recommendations? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




The International Telecommunications Union (ITU)
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In which component in a fiber-optics communication system do changes to the intensity of
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the optical signal occur?
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The optical transmitter ||\\|//|| ||\\|//||




We have an expert-written solution to this problem!
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What is one drawback of using Fabry-Perot (F-P) lasers in high-speed data (HSD)
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networks?

The emission of several discrete wavelengths or side modes
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Why are laser diodes most effective when coupled to single-mode fiber (SMF)?
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The laser diode has a small spectral width, efficient coupling, and fast modulation speeds
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,What is the main factor in determining the sensitivity of an optical receiver?
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Noise




Which diode is most commonly used in optical receivers because it is inexpensive and can
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be operated from a standard power supply?
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Positive-intrinsic-negative (PIN) diode ||\\|//|| ||\\|//||




What does the multiplication process, which amplifies the electrical signal in an APD,
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introduce into the electrical output of an optical detector? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Noise




Which type of diode requires a higher voltage power supply and more complex circuitry
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than PIN diodes?
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APD




Which of the following is the ratio of electrical output power from the detector to the
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optical input power, expressed by amperes or volts per watt of optical input power?
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Responsivity




What type of LED has relatively narrow spectral widths, high output power levels, and
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performs at high modulation rates? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Edge-emitting LED ||\\|//||

, Why was the zero-dispersion point in SMF moved to 1,550 nm?
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To take advantage of SMF's low intrinsic absorption and lower attenuation at 1550 nm
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What type of SMF is ideal for FTTH installations
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The ITU-T G.657 bend-insensitive fiber (BIF)
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What are the primary causes of intrinsic loss in SMF
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Material absorption and Rayleigh scattering ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Light is guided along the core of a fiber because of this difference between the core and
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cladding

Refractive indexes ||\\|//||




Where would you expect Fresnel reflections to occur in a fiber-optic network?
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At connections and mechanical splices where the signal source is entering or exiting the
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cable




Chromatic dispersion is a combination of which two dispersions? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Material and waveguide dispersion ||\\|//|| ||\\|//|| ||\\|//||