FIBER INSTALLATION AND
ACTIVATION QUESTIONS AND
CORRECT EXPECTED SOLUTIONS
All fiber-optic communication systems must contain
An optical fiber transmission medium
The optical fiber core
Transmits the optical signal, and its structure and
chemical makeup are critical to fiber operation.
Wavelengths used in a fiber-optic communication
system
Include 1,310 nm and 1,550 nm in single-mode
transmission
systems.
As a lightwave enters an optical fiber,
Its speed decreases, and the lightwave refracts at an
angle.
Attenuation in fiber
Can be caused by absorption, scattering, macrobends,
and
fiber numerical aperture mismatch.
Which of the following is not an advantage of optical
fiber?
Fiber carries more electrical current and radiates more
energy than coaxial cable.
,Which of the following is true about light source
selection
criteria?
Cost should never be a higher concern than the quality of
the signal required to meet system performance.
Laser diodes
Being applied for the upstream transmission from homes
and
businesses are DFB lasers, due to the increased
bandwidth
demands of voice and data services
Which of the following is not true about optical
detector
selection criteria?
Silicon is a more suitable photodetector material than
indium gallium arsenide for wavelengths of 1,310 or
1,550 nm.
Avalanche photodiode detectors
Require high stability power supplies because bias
voltages
to create high electrical fields also must be high.
Fiber Optics
Light transmission through optical fibers for
communications purposes.
Hybrid Fiber/Coax (HFC)
A broadband cable system architecture that uses both
fiber-optic and coaxial cable.
Fiber to the home (FTTH)
Distribution of communication services by providing fiber-
optic links all the way to each house
Wavelength
, The length of a sinusoidal wave form measured from any
point on one wave, to the corresponding point on the next
wave, such as from crest to crest. In other words, a
wavelength is the distance an electromagnetic wave
travels in the time it takes to oscillate through a complete
cycle.
In optical terms a wavelength and the frequency of light
are considered synonymous. Fiver-optic communications
typically use 850nm, 1310nm, 1,550 nm wavelengths for
signal transport.
Single- mode
Single mode fiber allows only one mode of signal
propagation through the fiber core material. The small size
of the core along with the fiber graded refractive index
provides a narrow path for the signal to flow allowing
greater distance and decreased modal dispersion. the use
of single mode fiber dominates the Cable and
Telecommunications metro and long haul networks and is
by far the most commonly used fiber type outside plant
applications.
Light Source
Generic term for an LED or Laser type transmitter; term
usually used in optical test equipment.
Photodetector
An electro-optic device that transforms light energy into
electrical energy.
Light Emitting Diode (LED)
A semiconductor device that emits incoherent light formed
by the positive-negative (P-N) junction.
Laser diode
ACTIVATION QUESTIONS AND
CORRECT EXPECTED SOLUTIONS
All fiber-optic communication systems must contain
An optical fiber transmission medium
The optical fiber core
Transmits the optical signal, and its structure and
chemical makeup are critical to fiber operation.
Wavelengths used in a fiber-optic communication
system
Include 1,310 nm and 1,550 nm in single-mode
transmission
systems.
As a lightwave enters an optical fiber,
Its speed decreases, and the lightwave refracts at an
angle.
Attenuation in fiber
Can be caused by absorption, scattering, macrobends,
and
fiber numerical aperture mismatch.
Which of the following is not an advantage of optical
fiber?
Fiber carries more electrical current and radiates more
energy than coaxial cable.
,Which of the following is true about light source
selection
criteria?
Cost should never be a higher concern than the quality of
the signal required to meet system performance.
Laser diodes
Being applied for the upstream transmission from homes
and
businesses are DFB lasers, due to the increased
bandwidth
demands of voice and data services
Which of the following is not true about optical
detector
selection criteria?
Silicon is a more suitable photodetector material than
indium gallium arsenide for wavelengths of 1,310 or
1,550 nm.
Avalanche photodiode detectors
Require high stability power supplies because bias
voltages
to create high electrical fields also must be high.
Fiber Optics
Light transmission through optical fibers for
communications purposes.
Hybrid Fiber/Coax (HFC)
A broadband cable system architecture that uses both
fiber-optic and coaxial cable.
Fiber to the home (FTTH)
Distribution of communication services by providing fiber-
optic links all the way to each house
Wavelength
, The length of a sinusoidal wave form measured from any
point on one wave, to the corresponding point on the next
wave, such as from crest to crest. In other words, a
wavelength is the distance an electromagnetic wave
travels in the time it takes to oscillate through a complete
cycle.
In optical terms a wavelength and the frequency of light
are considered synonymous. Fiver-optic communications
typically use 850nm, 1310nm, 1,550 nm wavelengths for
signal transport.
Single- mode
Single mode fiber allows only one mode of signal
propagation through the fiber core material. The small size
of the core along with the fiber graded refractive index
provides a narrow path for the signal to flow allowing
greater distance and decreased modal dispersion. the use
of single mode fiber dominates the Cable and
Telecommunications metro and long haul networks and is
by far the most commonly used fiber type outside plant
applications.
Light Source
Generic term for an LED or Laser type transmitter; term
usually used in optical test equipment.
Photodetector
An electro-optic device that transforms light energy into
electrical energy.
Light Emitting Diode (LED)
A semiconductor device that emits incoherent light formed
by the positive-negative (P-N) junction.
Laser diode
