ETA Fiber Optic Installer Certification - Study Guide
Latest 2022 Update (100% Verified)
Light is electromagnetic energy with a _____ frequency and a _____ wavelength compared to radios.
- -Higher; shorter
What type of light is used in fiber optic transmissions? - -Infrared (IR)
What are the four items needed for a fiber optic system to work? - -Transmitter, fiber optic
cable, receiver, and connector
1 mW is the same as what in dBm? - -0 dBm (absolute power)
How is the power measured in fiber optics? - -dBm
What fiber optic wavelength has the lowest loss? - -1550 nm wavelength
What wavelength windows are used most for fiber optic communications? - -850 nm, 1300
nm, and 1550 nm wavelengths
What year was fiber optic cable first used in commercial telephone systems in the U.S.? - -
1977
What light source is used for singlemode fiber? - -Laser diode
, What two light sources are used with multimode fiber? - -LED and VCSEL
All wavelengths of light travel at the same speed. (true or false; why) - -False; different
wavelengths of light travel at different velocities
Which type of fiber has the larger core size: singlemode or multimode? - -Multimode
What is OSHA responsible for? - -OSHA is responsible for enforcing it's standards on
regulated entities
What are two ways to reduce modal dispersion? - -Use a smaller core; use graded-index fiber
What happens to the wavelength in fiber when the number of modes increase? - -The
wavelength gets shorter with more modes
Where does Fresnel reflection occur? - -Air gas and mechanical interconnections
What is it called when light bends when moving between water and air? - -Refraction
What is the refractive index of the core and cladding of fiber? - -Core - 1.457 and 1.451;
cladding - 1.42
Latest 2022 Update (100% Verified)
Light is electromagnetic energy with a _____ frequency and a _____ wavelength compared to radios.
- -Higher; shorter
What type of light is used in fiber optic transmissions? - -Infrared (IR)
What are the four items needed for a fiber optic system to work? - -Transmitter, fiber optic
cable, receiver, and connector
1 mW is the same as what in dBm? - -0 dBm (absolute power)
How is the power measured in fiber optics? - -dBm
What fiber optic wavelength has the lowest loss? - -1550 nm wavelength
What wavelength windows are used most for fiber optic communications? - -850 nm, 1300
nm, and 1550 nm wavelengths
What year was fiber optic cable first used in commercial telephone systems in the U.S.? - -
1977
What light source is used for singlemode fiber? - -Laser diode
, What two light sources are used with multimode fiber? - -LED and VCSEL
All wavelengths of light travel at the same speed. (true or false; why) - -False; different
wavelengths of light travel at different velocities
Which type of fiber has the larger core size: singlemode or multimode? - -Multimode
What is OSHA responsible for? - -OSHA is responsible for enforcing it's standards on
regulated entities
What are two ways to reduce modal dispersion? - -Use a smaller core; use graded-index fiber
What happens to the wavelength in fiber when the number of modes increase? - -The
wavelength gets shorter with more modes
Where does Fresnel reflection occur? - -Air gas and mechanical interconnections
What is it called when light bends when moving between water and air? - -Refraction
What is the refractive index of the core and cladding of fiber? - -Core - 1.457 and 1.451;
cladding - 1.42
