ETA FIBER OPTIC INSTALLER CERTIFICATION STUDY
GUIDE WITH ALL CORRECT & VERIFIED ANSWERS
(UPDATED TO PASS)
Light is electromagnetic energy with a _____ frequency and a _____ wavelength compared to radios.
Correct answer-Higher; shorter
What type of light is used in fiber optic transmissions? Correct answer-Infrared (IR)
What are the four items needed for a fiber optic system to work? Correct answer-Transmitter, fiber
optic cable, receiver, and connector
1 mW is the same as what in dBm? Correct answer-0 dBm (absolute power)
How is the power measured in fiber optics? Correct answer-dBm
What fiber optic wavelength has the lowest loss? Correct answer-1550 nm wavelength
What wavelength windows are used most for fiber optic communications? Correct answer-850 nm,
1300 nm, and 1550 nm wavelengths
What year was fiber optic cable first used in commercial telephone systems in the U.S.? Correct
answer-1977
What light source is used for singlemode fiber? Correct answer-Laser diode
What two light sources are used with multimode fiber? Correct answer-LED and VCSEL
All wavelengths of light travel at the same speed. (true or false; why) Correct answer-False;
different wavelengths of light travel at different velocities
Which type of fiber has the larger core size: singlemode or multimode? Correct answer-Multimode
What is OSHA responsible for? Correct answer-OSHA is responsible for enforcing it's standards on
regulated entities
What are two ways to reduce modal dispersion? Correct answer-Use a smaller core; use graded-
index fiber
What happens to the wavelength in fiber when the number of modes increase? Correct answer-
The wavelength gets shorter with more modes
Where does Fresnel reflection occur? Correct answer-Air gas and mechanical interconnections
What is it called when light bends when moving between water and air? Correct answer-Refraction
What is the refractive index of the core and cladding of fiber? Correct answer-Core - 1.457 and
1.451; cladding - 1.42
, Singlemode fiber systems usually operate at what three wavelengths? Correct answer-1310 nm,
1550 nm, and 1625 nm wavelengths
What two multimode wavelengths are the most commonly used? Correct answer-850 nm and
1300 nm wavelengths
How is attenuation measured? Correct answer-Decibels (dB)
What is a "mode" in fiber? Correct answer-A path of light
What will happen to the tensile strength of a fiber cable if it is bent more than recommended?
Correct answer-The tensile strength decreases
OM3 and OM4 multimode fibers are known as what type of fiber? Correct answer-Laser optimized
multimode fiber
What are the two most common core and cladding sizes in multimode fiber? Correct answer-
62.5/125 um (US); 50/125 um (EU)
What is the buffer size for a fiber used in tight buffered cables? Correct answer-900 um
What jacket color does singlemode fiber have? Correct answer-Yellow
What are the 12 fiber color codes in order? Correct answer-Blue, Orange, Green, Brown, Slate,
White, Red, Black, Yellow, Violet, Rose, Aqua
OM1 and OM2 are known as what types of fibers? Correct answer-Legacy multimode fibers
Why does graded-index fiber use numerous concentric layers of glass? Correct answer-Reduce
modal dispersion
What is the fiber's cladding bonded to during the assembly process? Correct answer-Ferrule
connector
A fiber optic cable that is "fire retardant and low smoke" is called what according to the NEC?
Correct answer-Plenum
What type of fiber has an aqua jacket? Correct answer-Laser optimized multimode fiber
What does the gel in a loose tube fiber optic cable protect the fiber from if the jacket fails? Correct
answer-Protects the fiber from moisture in outdoor environments
What is OFNR? Correct answer-Optical Fiber Non-conductive Riser
The NEC considers cables that contain no conductive members as what type of cable? Correct
answer-Non-conductive cable
What type of cable has optical fibers and current-carrying electrical conductors in the same jacket?
Correct answer-Composite cable
GUIDE WITH ALL CORRECT & VERIFIED ANSWERS
(UPDATED TO PASS)
Light is electromagnetic energy with a _____ frequency and a _____ wavelength compared to radios.
Correct answer-Higher; shorter
What type of light is used in fiber optic transmissions? Correct answer-Infrared (IR)
What are the four items needed for a fiber optic system to work? Correct answer-Transmitter, fiber
optic cable, receiver, and connector
1 mW is the same as what in dBm? Correct answer-0 dBm (absolute power)
How is the power measured in fiber optics? Correct answer-dBm
What fiber optic wavelength has the lowest loss? Correct answer-1550 nm wavelength
What wavelength windows are used most for fiber optic communications? Correct answer-850 nm,
1300 nm, and 1550 nm wavelengths
What year was fiber optic cable first used in commercial telephone systems in the U.S.? Correct
answer-1977
What light source is used for singlemode fiber? Correct answer-Laser diode
What two light sources are used with multimode fiber? Correct answer-LED and VCSEL
All wavelengths of light travel at the same speed. (true or false; why) Correct answer-False;
different wavelengths of light travel at different velocities
Which type of fiber has the larger core size: singlemode or multimode? Correct answer-Multimode
What is OSHA responsible for? Correct answer-OSHA is responsible for enforcing it's standards on
regulated entities
What are two ways to reduce modal dispersion? Correct answer-Use a smaller core; use graded-
index fiber
What happens to the wavelength in fiber when the number of modes increase? Correct answer-
The wavelength gets shorter with more modes
Where does Fresnel reflection occur? Correct answer-Air gas and mechanical interconnections
What is it called when light bends when moving between water and air? Correct answer-Refraction
What is the refractive index of the core and cladding of fiber? Correct answer-Core - 1.457 and
1.451; cladding - 1.42
, Singlemode fiber systems usually operate at what three wavelengths? Correct answer-1310 nm,
1550 nm, and 1625 nm wavelengths
What two multimode wavelengths are the most commonly used? Correct answer-850 nm and
1300 nm wavelengths
How is attenuation measured? Correct answer-Decibels (dB)
What is a "mode" in fiber? Correct answer-A path of light
What will happen to the tensile strength of a fiber cable if it is bent more than recommended?
Correct answer-The tensile strength decreases
OM3 and OM4 multimode fibers are known as what type of fiber? Correct answer-Laser optimized
multimode fiber
What are the two most common core and cladding sizes in multimode fiber? Correct answer-
62.5/125 um (US); 50/125 um (EU)
What is the buffer size for a fiber used in tight buffered cables? Correct answer-900 um
What jacket color does singlemode fiber have? Correct answer-Yellow
What are the 12 fiber color codes in order? Correct answer-Blue, Orange, Green, Brown, Slate,
White, Red, Black, Yellow, Violet, Rose, Aqua
OM1 and OM2 are known as what types of fibers? Correct answer-Legacy multimode fibers
Why does graded-index fiber use numerous concentric layers of glass? Correct answer-Reduce
modal dispersion
What is the fiber's cladding bonded to during the assembly process? Correct answer-Ferrule
connector
A fiber optic cable that is "fire retardant and low smoke" is called what according to the NEC?
Correct answer-Plenum
What type of fiber has an aqua jacket? Correct answer-Laser optimized multimode fiber
What does the gel in a loose tube fiber optic cable protect the fiber from if the jacket fails? Correct
answer-Protects the fiber from moisture in outdoor environments
What is OFNR? Correct answer-Optical Fiber Non-conductive Riser
The NEC considers cables that contain no conductive members as what type of cable? Correct
answer-Non-conductive cable
What type of cable has optical fibers and current-carrying electrical conductors in the same jacket?
Correct answer-Composite cable
