FIBER OPTICS (LIGHT BRIGADE) QUESTIONS
AND CORRECT ANSWERS WITH COMPLETE
SOLUTIONS | NEW UPDATE 2025
When was the first North American commercial fiber optic system installed? -
ANSWER 1977
What is a mode in an optical fiber? - ANSWER Path
What are the "three Cs" of an optical fiber? - ANSWER Core, Cladding, Coating
What are the three critical factors to be considered when working with a fiber
optic network? - ANSWER Attenuation, Dispersion, Reflection
What does the acronym ITU represent? - ANSWER International
Telecommunication Union
what are the two most commonly used sizes of multimode cores? - ANSWER
50um, 62.5um
What unit of measurement is used to measure and express wavelengths? -
ANSWER nm - nanometer
what unit of measurement is used to denote the size of a fiber's core, cladding,
and coating? - ANSWER um - microns
,what are the outside diameters of single-mode and multimode claddings? -
ANSWER 125um
What effects are optical fibers immune to? - ANSWER Electrical, Radio
what are the three primary wavelength windows in a fiber optic system? -
ANSWER 850, 1300, 1550
which wavelength has the lowest attenuation? - ANSWER 1550
what part of the electromagnetic spectrum is used by fiber optic systems? -
ANSWER Infrared
Does light have a higher or lower frequency that radio waves? - ANSWER
Higher frequency
Does light waves have a longer or shorter wavelength than radio waves? -
ANSWER Shorter wavelength
what is the bending of light called? - ANSWER Refraction
what type of reflection is caused by an air gap in a connector pair? - ANSWER
Fresnel reflection
what are the three ways to reduce modal dispersion in a multimode system? -
ANSWER graded index fiber, smaller core, longer wavelength
, True or False: All wavelengths travel at the same speed through the fiber. -
ANSWER False
What are the two most common multimode wavelengths? - ANSWER 850,
1300
What type of loss will a poor cleave angle cause: intrinsic or extrinsic? -
ANSWER Extrinsic
The acronym IOR is the ratio of speed of light in a vacuum versus the speed of
light in what? - ANSWER Glass
What term defines defects that result from poor polishing, fiber misalignment,
poor cleave angles, and poor cleaning practices? - ANSWER Extrinsic
True or False: 80% of the light travels in the core of a single-mode fiber and 20%
travels in the inner cladding that is defined as the mode field diameter. -
ANSWER True
Which type dispersion effect multimode fiber and is direct relation the larger core
size? - ANSWER Modal dispersion
Which type of dispersion is a combination of material and waveguide dispersion
and effects single-mode fiber? - ANSWER Chromatic dispersion
AND CORRECT ANSWERS WITH COMPLETE
SOLUTIONS | NEW UPDATE 2025
When was the first North American commercial fiber optic system installed? -
ANSWER 1977
What is a mode in an optical fiber? - ANSWER Path
What are the "three Cs" of an optical fiber? - ANSWER Core, Cladding, Coating
What are the three critical factors to be considered when working with a fiber
optic network? - ANSWER Attenuation, Dispersion, Reflection
What does the acronym ITU represent? - ANSWER International
Telecommunication Union
what are the two most commonly used sizes of multimode cores? - ANSWER
50um, 62.5um
What unit of measurement is used to measure and express wavelengths? -
ANSWER nm - nanometer
what unit of measurement is used to denote the size of a fiber's core, cladding,
and coating? - ANSWER um - microns
,what are the outside diameters of single-mode and multimode claddings? -
ANSWER 125um
What effects are optical fibers immune to? - ANSWER Electrical, Radio
what are the three primary wavelength windows in a fiber optic system? -
ANSWER 850, 1300, 1550
which wavelength has the lowest attenuation? - ANSWER 1550
what part of the electromagnetic spectrum is used by fiber optic systems? -
ANSWER Infrared
Does light have a higher or lower frequency that radio waves? - ANSWER
Higher frequency
Does light waves have a longer or shorter wavelength than radio waves? -
ANSWER Shorter wavelength
what is the bending of light called? - ANSWER Refraction
what type of reflection is caused by an air gap in a connector pair? - ANSWER
Fresnel reflection
what are the three ways to reduce modal dispersion in a multimode system? -
ANSWER graded index fiber, smaller core, longer wavelength
, True or False: All wavelengths travel at the same speed through the fiber. -
ANSWER False
What are the two most common multimode wavelengths? - ANSWER 850,
1300
What type of loss will a poor cleave angle cause: intrinsic or extrinsic? -
ANSWER Extrinsic
The acronym IOR is the ratio of speed of light in a vacuum versus the speed of
light in what? - ANSWER Glass
What term defines defects that result from poor polishing, fiber misalignment,
poor cleave angles, and poor cleaning practices? - ANSWER Extrinsic
True or False: 80% of the light travels in the core of a single-mode fiber and 20%
travels in the inner cladding that is defined as the mode field diameter. -
ANSWER True
Which type dispersion effect multimode fiber and is direct relation the larger core
size? - ANSWER Modal dispersion
Which type of dispersion is a combination of material and waveguide dispersion
and effects single-mode fiber? - ANSWER Chromatic dispersion
