FIBER INSTALLATION AND
ACTIVATION EXAM QUESTIONS AND
THEIR 100% CORRECT SOLUTIONS
What is the Fiber-optic cable term for optical transport
that is restricted to one path (mode) for light
propagation through the core of an optical fiber?
Single Mode Fiber
A type of optical fiber with large core diameters which
allow multiple modes, or paths, upon which the optical
signal travels is known as what?
Multi - Mode Fiber
In fiber-optic terminology, what is "window" ?
Refers to a center optical wavelength, as well as a range
of wavelengths on either side of the center wavelength
What are the four standard optical windows?
850 nm, 1,300 nm, 1,550 nm, and 1,625 nm.
What window is exclusively used for multimode fiber?
850 nm
What is an Erbium-doped fiber amplifier (EDFA)?
An optical amplifier that uses active erbium-doped fiber
and a pump source (laser) to boost or amplify the optical
signal?
What are the three basic components of all fiber-optic
communications networks?
(1) an optical transmitter with a light source; (2) the optical
fiber (3) an optical receiver with a photodetector.
,What characteristic of a fiber-optic cable enhances the
security of signals being transported in the network?
Fiber optics are typically made of glass which is a
dielectric material which is basically immune to EMI and
RFI
What telecommunication standard designation
encompasses all things voice, video, and data?
ITU Telecommunications Standardization Sector ITU-T
Single -mode fiber-optic cable is optimized to
transport which wavelengths?
1310 nm & 1550 nm
An optical fiber consists of what three basic parts?
Core, Cladding, and Coating
What does the spectral width of a laser or Light
Emitting Diode (LED) define?
A measurement for the band of wavelengths over which a
laser light source emits its energy, generally measured in
nanometers (Nm) between the half power points of an
optical light sources maximum amplitude at the center
frequency Full Width Half Maximum (FWHM)
Which type of laser is ideal for analog, high speed
digital, and optical multiplexing networks because of
its high SNR (signal to noise ratio) and small spectral
widths?
Distributed Feed Back (DFB) laser
What are the two common types of laser diodes used
in fiber optic networks?
Distributed Feed Back (DFB) lasers and Fabry-Perot (F-P)
lasers
What are two types of optical detector used in fiber-
optic networks?
, Positive-Intrinsic-Negative diode (PIN) & Avalanche Photo
Diode (APD)
What are the two methods used to modulate an optical
carrier ?
Direct Modulation and Indirect Modulation
How is optimal sensitivity in an optical receiver
obtained?
Efficient Coupling to the optical fiber to transfer the
maximum amount of optical power from the optical fiber to
the receiver.
Why is the positive -intrinsic - negative (PIN) photo-
diode the most common type of photo-diode used in
optical receivers?
It is relatively inexpensive and can be operated from a
standard power supply.
What is the primary difference between an avalanche
photo-diode (APD) and a positive-intrinsic-negative
(PIN) photo-diode?
APD require a higher voltage power supply and more
complex circuitry
What type of electrical detection can improve the
sensitivity of an optical reliever by as much as 20dB?
Coherent Detection
Which standards organization is considered to be the
creator of the world's most recognized
communications standards, known as
"recommendations?"
The International Telecommunication Union (ITU).
In which component in a fiber-optics communication
system do changes to the intensity of the optical
signal occur?
ACTIVATION EXAM QUESTIONS AND
THEIR 100% CORRECT SOLUTIONS
What is the Fiber-optic cable term for optical transport
that is restricted to one path (mode) for light
propagation through the core of an optical fiber?
Single Mode Fiber
A type of optical fiber with large core diameters which
allow multiple modes, or paths, upon which the optical
signal travels is known as what?
Multi - Mode Fiber
In fiber-optic terminology, what is "window" ?
Refers to a center optical wavelength, as well as a range
of wavelengths on either side of the center wavelength
What are the four standard optical windows?
850 nm, 1,300 nm, 1,550 nm, and 1,625 nm.
What window is exclusively used for multimode fiber?
850 nm
What is an Erbium-doped fiber amplifier (EDFA)?
An optical amplifier that uses active erbium-doped fiber
and a pump source (laser) to boost or amplify the optical
signal?
What are the three basic components of all fiber-optic
communications networks?
(1) an optical transmitter with a light source; (2) the optical
fiber (3) an optical receiver with a photodetector.
,What characteristic of a fiber-optic cable enhances the
security of signals being transported in the network?
Fiber optics are typically made of glass which is a
dielectric material which is basically immune to EMI and
RFI
What telecommunication standard designation
encompasses all things voice, video, and data?
ITU Telecommunications Standardization Sector ITU-T
Single -mode fiber-optic cable is optimized to
transport which wavelengths?
1310 nm & 1550 nm
An optical fiber consists of what three basic parts?
Core, Cladding, and Coating
What does the spectral width of a laser or Light
Emitting Diode (LED) define?
A measurement for the band of wavelengths over which a
laser light source emits its energy, generally measured in
nanometers (Nm) between the half power points of an
optical light sources maximum amplitude at the center
frequency Full Width Half Maximum (FWHM)
Which type of laser is ideal for analog, high speed
digital, and optical multiplexing networks because of
its high SNR (signal to noise ratio) and small spectral
widths?
Distributed Feed Back (DFB) laser
What are the two common types of laser diodes used
in fiber optic networks?
Distributed Feed Back (DFB) lasers and Fabry-Perot (F-P)
lasers
What are two types of optical detector used in fiber-
optic networks?
, Positive-Intrinsic-Negative diode (PIN) & Avalanche Photo
Diode (APD)
What are the two methods used to modulate an optical
carrier ?
Direct Modulation and Indirect Modulation
How is optimal sensitivity in an optical receiver
obtained?
Efficient Coupling to the optical fiber to transfer the
maximum amount of optical power from the optical fiber to
the receiver.
Why is the positive -intrinsic - negative (PIN) photo-
diode the most common type of photo-diode used in
optical receivers?
It is relatively inexpensive and can be operated from a
standard power supply.
What is the primary difference between an avalanche
photo-diode (APD) and a positive-intrinsic-negative
(PIN) photo-diode?
APD require a higher voltage power supply and more
complex circuitry
What type of electrical detection can improve the
sensitivity of an optical reliever by as much as 20dB?
Coherent Detection
Which standards organization is considered to be the
creator of the world's most recognized
communications standards, known as
"recommendations?"
The International Telecommunication Union (ITU).
In which component in a fiber-optics communication
system do changes to the intensity of the optical
signal occur?
