Fiber Optics Exam Questions and
Answers 100% Verified
What type of light is used in fiber optic transmission? - ANSWER - Infrared
What are the 4 items are needed for a fiber optic system to work? - ANSWER -
Transmitter
Fiber cable
Receiver
Connectors
1 mw is the same as what in dBm? - ANSWER - 0 dBm
How is power measured in fiber optics? - ANSWER - dBm
What fiber optic wavelength has the lowest loss? - ANSWER - 1550
What wavelengths windows are used most for communications in optical fibers? -
ANSWER - 850nm
1300nm
1550nm
What year was fiber optic cable first used in commercial telephone systems in the
U.S.? - ANSWER - 1977
What light source is used for single mode fiber? - ANSWER - Laser diode
What two light sources are used with multimode fiber? - ANSWER - LED and VCSEL
All wavelengths of light travel at the same speed?
, True or false - ANSWER - False
Which type of fiber has the larger core size? Single mode or multimode - ANSWER -
Multimode
What is OSHA responsible for? - ANSWER - To enforce safety precautions
OM3 and OM4 multimode fibers are known as what type of fiber? - ANSWER - Laser
optimized
What are the two most common core and cladding sizes in multimode optical fiber?
- ANSWER - 50/125nm and 62.5nm
The buffer diameter for fiber used in tight buffered cables is what? - ANSWER -
900nm
What jacket color does single mode fiber have? - ANSWER - Yellow
What are the two ways to reduce modal dispersion? - ANSWER - Use graded index
fiber.
Shrink the core size.
What happens to the wavelength in optical fiber when the number of modes
increase? - ANSWER - The wavelength gets shorter
Where does fresnel reflection occur? - ANSWER - At the air gap
Inter mechanical connection
What is it called when light bends when moving between water and air? - ANSWER -
refraction
What is the refractive index of the core and cladding of MM optical fiber? - ANSWER
- 1.42 is for cladding
Answers 100% Verified
What type of light is used in fiber optic transmission? - ANSWER - Infrared
What are the 4 items are needed for a fiber optic system to work? - ANSWER -
Transmitter
Fiber cable
Receiver
Connectors
1 mw is the same as what in dBm? - ANSWER - 0 dBm
How is power measured in fiber optics? - ANSWER - dBm
What fiber optic wavelength has the lowest loss? - ANSWER - 1550
What wavelengths windows are used most for communications in optical fibers? -
ANSWER - 850nm
1300nm
1550nm
What year was fiber optic cable first used in commercial telephone systems in the
U.S.? - ANSWER - 1977
What light source is used for single mode fiber? - ANSWER - Laser diode
What two light sources are used with multimode fiber? - ANSWER - LED and VCSEL
All wavelengths of light travel at the same speed?
, True or false - ANSWER - False
Which type of fiber has the larger core size? Single mode or multimode - ANSWER -
Multimode
What is OSHA responsible for? - ANSWER - To enforce safety precautions
OM3 and OM4 multimode fibers are known as what type of fiber? - ANSWER - Laser
optimized
What are the two most common core and cladding sizes in multimode optical fiber?
- ANSWER - 50/125nm and 62.5nm
The buffer diameter for fiber used in tight buffered cables is what? - ANSWER -
900nm
What jacket color does single mode fiber have? - ANSWER - Yellow
What are the two ways to reduce modal dispersion? - ANSWER - Use graded index
fiber.
Shrink the core size.
What happens to the wavelength in optical fiber when the number of modes
increase? - ANSWER - The wavelength gets shorter
Where does fresnel reflection occur? - ANSWER - At the air gap
Inter mechanical connection
What is it called when light bends when moving between water and air? - ANSWER -
refraction
What is the refractive index of the core and cladding of MM optical fiber? - ANSWER
- 1.42 is for cladding
