FIBER INSTALLATION AND ACTIVATION
EXAM WITH QUESTIONS AND CORRECT
ANSWERS (VERIFIED)
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? - ANSWER 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? - ANSWER Multi - Mode Fiber
In fiber-optic terminology, what is "window" ? - ANSWER 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? - ANSWER 850 nm, 1,300
nm, 1,550 nm, and 1,625 nm.
What window is exclusively used for multimode fiber? - ANSWER 850
nm
,What is an Erbium-doped fiber amplifier (EDFA)? - ANSWER 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? - ANSWER (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? - ANSWER 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? - ANSWER ITU Telecommunications
Standardization Sector ITU-T
Single -mode fiber-optic cable is optimized to transport which
wavelengths? - ANSWER 1310 nm & 1550 nm
An optical fiber consists of what three basic parts? - ANSWER Core,
Cladding, and Coating
What does the spectral width of a laser or Light Emitting Diode (LED)
define? - ANSWER 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? - ANSWER Distributed Feed Back (DFB) laser
What are the two common types of laser diodes used in fiber optic
networks? - ANSWER Distributed Feed Back (DFB) lasers and Fabry-
Perot (F-P) lasers
What are two types of optical detector used in fiber-optic networks? -
ANSWER Positive-Intrinsic-Negative diode (PIN) & Avalanche Photo
Diode (APD)
What are the two methods used to modulate an optical carrier ? -
ANSWER Direct Modulation and Indirect Modulation
How is optimal sensitivity in an optical receiver obtained? - ANSWER
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? - ANSWER 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? - ANSWER
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? - ANSWER Coherent Detection
Which standards organization is considered to be the creator of the
world's most recognized communications standards, known as
"recommendations?" - ANSWER The International Telecommunication
Union (ITU).
In which component in a fiber-optics communication system do changes
to the intensity of the optical signal occur? - ANSWER The optical
transmitter.
What is a drawback of using Fabry-Perot (F-P) lasers in high-speed data
(HSD) networks? - ANSWER The emission of a number of discrete
wavelengths or side modes.
Why are laser diodes most effective when coupled to single mode fiber?
- ANSWER Its high coupled power, directionality, and speed.
EXAM WITH QUESTIONS AND CORRECT
ANSWERS (VERIFIED)
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? - ANSWER 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? - ANSWER Multi - Mode Fiber
In fiber-optic terminology, what is "window" ? - ANSWER 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? - ANSWER 850 nm, 1,300
nm, 1,550 nm, and 1,625 nm.
What window is exclusively used for multimode fiber? - ANSWER 850
nm
,What is an Erbium-doped fiber amplifier (EDFA)? - ANSWER 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? - ANSWER (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? - ANSWER 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? - ANSWER ITU Telecommunications
Standardization Sector ITU-T
Single -mode fiber-optic cable is optimized to transport which
wavelengths? - ANSWER 1310 nm & 1550 nm
An optical fiber consists of what three basic parts? - ANSWER Core,
Cladding, and Coating
What does the spectral width of a laser or Light Emitting Diode (LED)
define? - ANSWER 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? - ANSWER Distributed Feed Back (DFB) laser
What are the two common types of laser diodes used in fiber optic
networks? - ANSWER Distributed Feed Back (DFB) lasers and Fabry-
Perot (F-P) lasers
What are two types of optical detector used in fiber-optic networks? -
ANSWER Positive-Intrinsic-Negative diode (PIN) & Avalanche Photo
Diode (APD)
What are the two methods used to modulate an optical carrier ? -
ANSWER Direct Modulation and Indirect Modulation
How is optimal sensitivity in an optical receiver obtained? - ANSWER
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? - ANSWER 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? - ANSWER
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? - ANSWER Coherent Detection
Which standards organization is considered to be the creator of the
world's most recognized communications standards, known as
"recommendations?" - ANSWER The International Telecommunication
Union (ITU).
In which component in a fiber-optics communication system do changes
to the intensity of the optical signal occur? - ANSWER The optical
transmitter.
What is a drawback of using Fabry-Perot (F-P) lasers in high-speed data
(HSD) networks? - ANSWER The emission of a number of discrete
wavelengths or side modes.
Why are laser diodes most effective when coupled to single mode fiber?
- ANSWER Its high coupled power, directionality, and speed.
