NCTI Fiber Install & Activation Exam
Questions And Answers
Which standards organization is considered the creator of the
world's most recognized communications standards, known as
recommendations? -
correct answer ✅The International Telecommunications Union
(ITU)
In which component in a fiber-optics communication system do
changes to the intensity of the optical signal occur? -
correct answer ✅The optical transmitter
What is one drawback of using Fabry-Perot (F-P) lasers in high-
speed data (HSD) networks? -
correct answer ✅The emission of several discrete wavelengths or
side modes
Why are laser diodes most effective when coupled to single-mode
fiber (SMF)? -
correct answer ✅The laser diode has a small spectral width,
efficient coupling, and fast modulation speeds
What is the main factor in determining the sensitivity of an optical
receiver? -
correct answer ✅Noise
,NCTI Fiber Install & Activation Exam
Questions And Answers
Which diode is most commonly used in optical receivers because it
is inexpensive and can be operated from a standard power supply?
-
correct answer ✅Positive-intrinsic-negative (PIN) diode
What does the multiplication process, which amplifies the electrical
signal in an APD, introduce into the electrical output of an optical
detector? -
correct answer ✅Noise
Which type of diode requires a higher voltage power supply and
more complex circuitry than PIN diodes? -
correct answer ✅APD
Which of the following is the ratio of electrical output power from
the detector to the optical input power, expressed by amperes or
volts per watt of optical input power? -
correct answer ✅Responsivity
, NCTI Fiber Install & Activation Exam
Questions And Answers
What type of LED has relatively narrow spectral widths, high output
power levels, and performs at high modulation rates? -
correct answer ✅Edge-emitting LED
Why was the zero-dispersion point in SMF moved to 1,550 nm? -
correct answer ✅To take advantage of SMF's low intrinsic
absorption and lower attenuation at 1550 nm
What type of SMF is ideal for FTTH installations -
correct answer ✅The ITU-T G.657 bend-insensitive fiber (BIF)
What are the primary causes of intrinsic loss in SMF -
correct answer ✅Material absorption and Rayleigh scattering
Light is guided along the core of a fiber because of this difference
between the core and cladding -
correct answer ✅Refractive indexes
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
Questions And Answers
Which standards organization is considered the creator of the
world's most recognized communications standards, known as
recommendations? -
correct answer ✅The International Telecommunications Union
(ITU)
In which component in a fiber-optics communication system do
changes to the intensity of the optical signal occur? -
correct answer ✅The optical transmitter
What is one drawback of using Fabry-Perot (F-P) lasers in high-
speed data (HSD) networks? -
correct answer ✅The emission of several discrete wavelengths or
side modes
Why are laser diodes most effective when coupled to single-mode
fiber (SMF)? -
correct answer ✅The laser diode has a small spectral width,
efficient coupling, and fast modulation speeds
What is the main factor in determining the sensitivity of an optical
receiver? -
correct answer ✅Noise
,NCTI Fiber Install & Activation Exam
Questions And Answers
Which diode is most commonly used in optical receivers because it
is inexpensive and can be operated from a standard power supply?
-
correct answer ✅Positive-intrinsic-negative (PIN) diode
What does the multiplication process, which amplifies the electrical
signal in an APD, introduce into the electrical output of an optical
detector? -
correct answer ✅Noise
Which type of diode requires a higher voltage power supply and
more complex circuitry than PIN diodes? -
correct answer ✅APD
Which of the following is the ratio of electrical output power from
the detector to the optical input power, expressed by amperes or
volts per watt of optical input power? -
correct answer ✅Responsivity
, NCTI Fiber Install & Activation Exam
Questions And Answers
What type of LED has relatively narrow spectral widths, high output
power levels, and performs at high modulation rates? -
correct answer ✅Edge-emitting LED
Why was the zero-dispersion point in SMF moved to 1,550 nm? -
correct answer ✅To take advantage of SMF's low intrinsic
absorption and lower attenuation at 1550 nm
What type of SMF is ideal for FTTH installations -
correct answer ✅The ITU-T G.657 bend-insensitive fiber (BIF)
What are the primary causes of intrinsic loss in SMF -
correct answer ✅Material absorption and Rayleigh scattering
Light is guided along the core of a fiber because of this difference
between the core and cladding -
correct answer ✅Refractive indexes
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
