ETA Fiber Practice Questions with Correct
Answers 2026-2027
Light is electromagnetic energy with frequency and a shorter wavelength -
CORRECT ANSWER -Higher then shorter
fiber optics transmission takes place in portion of the light spectrum -
CORRECT ANSWER -IR
A simple fiber optic System consist of what 4 parts - CORRECT ANSWER -
Transmitter, fiber optic cable, receiver, connecters
What absolute power is Dbm referenced to - CORRECT ANSWER -1 milliwatt
Absolute power in optical fiber is specified as - CORRECT ANSWER -Dbm
Attenuation in optical fiber is lowest at what wavelength - CORRECT ANSWER -1550
What are the three most common wavelength windows used for communication thru optical fib
ers - CORRECT ANSWER -1550, 850, 1300
In North America what year was the first fiber optic telephone system installed -
CORRECT ANSWER -1977
Single-mode fiber optic systems typically use what light source - CORRECT ANSWER -Laser diode
Multimode Fiber optic transmitters typically use what two low cost light sources -
CORRECT ANSWER -Led, VCSEL
, The typical numerical aperture for 50/125 I'm optical fiber is - CORRECT ANSWER -.200
One way to reduce modal dispersion is to - CORRECT ANSWER -Use a smaller core
The number of modes in an optical fiber increases as the decreases - CORRECT ANSWER -
Wavelength
What optical effect is produced by all mechanical interconnections whether mechanical splices
or mated connected pairs - CORRECT ANSWER -Fresnel Reflections
When light passes from one transparent medium to anther transparent medium that has a diffe
rent refractive index the light wave bends this is called ? - CORRECT ANSWER -Refraction
What part of the multimode optical fiber has the lowest refraction index - CORRECT ANSWER -
Cladding
Single-mode fiber has a core compared to multimode fiber - CORRECT ANSWER -Smaller
Single mode systems usually operate at what three wavelengths - CORRECT ANSWER -
1625, 1550, 1310
What are the two most common multimode wavelengths - CORRECT ANSWER -859, 1300
Attenuation (loss) is specified as - CORRECT ANSWER -DB
What is a "mode" in optical fiber - CORRECT ANSWER -A light path
Answers 2026-2027
Light is electromagnetic energy with frequency and a shorter wavelength -
CORRECT ANSWER -Higher then shorter
fiber optics transmission takes place in portion of the light spectrum -
CORRECT ANSWER -IR
A simple fiber optic System consist of what 4 parts - CORRECT ANSWER -
Transmitter, fiber optic cable, receiver, connecters
What absolute power is Dbm referenced to - CORRECT ANSWER -1 milliwatt
Absolute power in optical fiber is specified as - CORRECT ANSWER -Dbm
Attenuation in optical fiber is lowest at what wavelength - CORRECT ANSWER -1550
What are the three most common wavelength windows used for communication thru optical fib
ers - CORRECT ANSWER -1550, 850, 1300
In North America what year was the first fiber optic telephone system installed -
CORRECT ANSWER -1977
Single-mode fiber optic systems typically use what light source - CORRECT ANSWER -Laser diode
Multimode Fiber optic transmitters typically use what two low cost light sources -
CORRECT ANSWER -Led, VCSEL
, The typical numerical aperture for 50/125 I'm optical fiber is - CORRECT ANSWER -.200
One way to reduce modal dispersion is to - CORRECT ANSWER -Use a smaller core
The number of modes in an optical fiber increases as the decreases - CORRECT ANSWER -
Wavelength
What optical effect is produced by all mechanical interconnections whether mechanical splices
or mated connected pairs - CORRECT ANSWER -Fresnel Reflections
When light passes from one transparent medium to anther transparent medium that has a diffe
rent refractive index the light wave bends this is called ? - CORRECT ANSWER -Refraction
What part of the multimode optical fiber has the lowest refraction index - CORRECT ANSWER -
Cladding
Single-mode fiber has a core compared to multimode fiber - CORRECT ANSWER -Smaller
Single mode systems usually operate at what three wavelengths - CORRECT ANSWER -
1625, 1550, 1310
What are the two most common multimode wavelengths - CORRECT ANSWER -859, 1300
Attenuation (loss) is specified as - CORRECT ANSWER -DB
What is a "mode" in optical fiber - CORRECT ANSWER -A light path
