ETA Fiber Optics Certification – Exam Questions with Correct Answers | A+ Graded | 100% LATEST
UPDATE 2026
Light is electromagnetic energy with a _________ frequency and a ________ wavelength compared to
radio waves. - (answer)Higher, Shorter
What type of light is used in Fiber Optic Transmissions - (answer)Infrared or IR
What are the four items needed for a Fiber Optic System to work? - (answer)Transmitter, Fiber Cable,
Receiver, Connectors
1mW is the same as what in dBM? - (answer)0 or absolute power
How is power measured in fiber? - (answer)mW or dBM
Propagation - (answer)light is reflected off a body and is return to its original emission point, the law of
propagation for the return trip is the original trip.
wavelength - (answer)Horizontal distance between the crests or between the troughs of two adjacent
waves
Frequency - (answer)the number of complete wavelengths that pass a point in a given time
What fiber optic wavelength has the lowest loss? - (answer)1550 um
What wavelength windows are used for most communications? - (answer)850, 1330, 1550
What year was the first fiber optic cable used in the communication telephone system? - (answer)1977
What light source is used for single mode? - (answer)Laser Diode LD
, ETA Fiber Optics Certification – Exam Questions with Correct Answers | A+ Graded | 100% LATEST
UPDATE 2026
What two light sources are used with multimode? - (answer)Light Emitting Diode (LED)
Vertical Cavity Surface Emitting Laser (VCSEL)
All wavelengths of light travel at the same speed. True or False - (answer)False
Which type of fiber has the largest core size? - (answer)Multi-mode
What is OSHA responsible for? - (answer)the identification of various hazards present in the workplace
and for the creation of rules and regulations to minimize exposure to such hazards
What are two ways to reduce modal dispersion? - (answer)Smaller Core and use graded index fiber
What happens to the wavelength in optical fiber when the number of modes increases? - (answer)Gets
shorter
decreases
When does Fresnel reflection occur - (answer)A small portion of the incident light is reflected back into
the source fiber at the fiber interface.
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 optical fiber - (answer)1.42 and 1.457
Single Mode usually operates at what three wavelengths? - (answer)1310
1550
1625
What two multi-mode wavelengths are most commonly used? - (answer)850
UPDATE 2026
Light is electromagnetic energy with a _________ frequency and a ________ wavelength compared to
radio waves. - (answer)Higher, Shorter
What type of light is used in Fiber Optic Transmissions - (answer)Infrared or IR
What are the four items needed for a Fiber Optic System to work? - (answer)Transmitter, Fiber Cable,
Receiver, Connectors
1mW is the same as what in dBM? - (answer)0 or absolute power
How is power measured in fiber? - (answer)mW or dBM
Propagation - (answer)light is reflected off a body and is return to its original emission point, the law of
propagation for the return trip is the original trip.
wavelength - (answer)Horizontal distance between the crests or between the troughs of two adjacent
waves
Frequency - (answer)the number of complete wavelengths that pass a point in a given time
What fiber optic wavelength has the lowest loss? - (answer)1550 um
What wavelength windows are used for most communications? - (answer)850, 1330, 1550
What year was the first fiber optic cable used in the communication telephone system? - (answer)1977
What light source is used for single mode? - (answer)Laser Diode LD
, ETA Fiber Optics Certification – Exam Questions with Correct Answers | A+ Graded | 100% LATEST
UPDATE 2026
What two light sources are used with multimode? - (answer)Light Emitting Diode (LED)
Vertical Cavity Surface Emitting Laser (VCSEL)
All wavelengths of light travel at the same speed. True or False - (answer)False
Which type of fiber has the largest core size? - (answer)Multi-mode
What is OSHA responsible for? - (answer)the identification of various hazards present in the workplace
and for the creation of rules and regulations to minimize exposure to such hazards
What are two ways to reduce modal dispersion? - (answer)Smaller Core and use graded index fiber
What happens to the wavelength in optical fiber when the number of modes increases? - (answer)Gets
shorter
decreases
When does Fresnel reflection occur - (answer)A small portion of the incident light is reflected back into
the source fiber at the fiber interface.
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 optical fiber - (answer)1.42 and 1.457
Single Mode usually operates at what three wavelengths? - (answer)1310
1550
1625
What two multi-mode wavelengths are most commonly used? - (answer)850
