FOA CFOT Terms and Definitions Final
Exam Questions with Absolutely Verified
Correct Solutions||Updated 2025/2026
Exam Tested Questions Already
Graded!!!
Bandwidth - ANSWER ✓ Range of signal frequencies or bit rate within which a
fiber optic component, link or network will operate. The maximum speed that data
can be transmitted over the link.
Backscattering - ANSWER ✓ The scattering of light in a fiber back toward the
source, used to make OTDR measurements.
Attenuation / Attenuator - ANSWER ✓ Reduction in optical power as it passes
along a fiber is called ___________, usually expressed in dB. Devices that do this
purposefully are called _____________
Numerical Aperture (NA) - ANSWER ✓ Measure of the light acceptance angle of
the fiber.
Network - ANSWER ✓ A system of cables, hardware and equipment used for
communications.
Nanometer (nm) - ANSWER ✓ Used to measure the wavelength of light.
Angled Physical Contact (APC) - ANSWER ✓ Technique involving polishing the
end surface of the fiber to a slight angle to prevent reflectance. Considered better
than convex polishing techniques (PC).
Analog - ANSWER ✓ Signals that are continually changing as opposed to being
digitally encoded.
Transmitter - ANSWER ✓ A device which includes an LED or laser source and
signal conditioning electronics that is used to inject a signal into fiber.
, Total internal reflection - ANSWER ✓ Confinement of light into the core of a
fiber by the reflection off the core-cladding boundary.
Test source - ANSWER ✓ A laser diode or LED used to inject an optical signal
into fiber for testing loss of the fiber or other components.
Test kit - ANSWER ✓ A kit of fiber optic instruments, incl. power meter, source
and test accessories (to measure loss and power)
Test cable - ANSWER ✓ A short single fiber jumper cable with connectors on
both ends. This cable must be made of fiber and connectors of matching type...
Termination - ANSWER ✓ The preparation of the end of a fiber to allow
connection to another fiber or active device.
Talkset - ANSWER ✓ A communication device that allows conversation over
unused fibers.
Surface emitter LED - ANSWER ✓ LED that emits light perpendicular to the
semiconductor chip. Most LEDs used in data communications are this type.
Step index fiber - ANSWER ✓ This is a multimode fiber where the core is all the
same index of refraction.
Steady State Modal Distribution - ANSWER ✓ Equilibrium modal distribution
(EMD) in multimode fiber (achieved some distance from the source) where the
relative power in the modes becomes stable with increasing distance.
Splitting Ratio - ANSWER ✓ The distribution of power among the output fibers
of a coupler.
Splice (fusion or mechanical) - ANSWER ✓ A device that provides for a
permanent connection between two fibers.
Source - ANSWER ✓ A laser diode or LED used to inject an optical signal into
fiber
Exam Questions with Absolutely Verified
Correct Solutions||Updated 2025/2026
Exam Tested Questions Already
Graded!!!
Bandwidth - ANSWER ✓ Range of signal frequencies or bit rate within which a
fiber optic component, link or network will operate. The maximum speed that data
can be transmitted over the link.
Backscattering - ANSWER ✓ The scattering of light in a fiber back toward the
source, used to make OTDR measurements.
Attenuation / Attenuator - ANSWER ✓ Reduction in optical power as it passes
along a fiber is called ___________, usually expressed in dB. Devices that do this
purposefully are called _____________
Numerical Aperture (NA) - ANSWER ✓ Measure of the light acceptance angle of
the fiber.
Network - ANSWER ✓ A system of cables, hardware and equipment used for
communications.
Nanometer (nm) - ANSWER ✓ Used to measure the wavelength of light.
Angled Physical Contact (APC) - ANSWER ✓ Technique involving polishing the
end surface of the fiber to a slight angle to prevent reflectance. Considered better
than convex polishing techniques (PC).
Analog - ANSWER ✓ Signals that are continually changing as opposed to being
digitally encoded.
Transmitter - ANSWER ✓ A device which includes an LED or laser source and
signal conditioning electronics that is used to inject a signal into fiber.
, Total internal reflection - ANSWER ✓ Confinement of light into the core of a
fiber by the reflection off the core-cladding boundary.
Test source - ANSWER ✓ A laser diode or LED used to inject an optical signal
into fiber for testing loss of the fiber or other components.
Test kit - ANSWER ✓ A kit of fiber optic instruments, incl. power meter, source
and test accessories (to measure loss and power)
Test cable - ANSWER ✓ A short single fiber jumper cable with connectors on
both ends. This cable must be made of fiber and connectors of matching type...
Termination - ANSWER ✓ The preparation of the end of a fiber to allow
connection to another fiber or active device.
Talkset - ANSWER ✓ A communication device that allows conversation over
unused fibers.
Surface emitter LED - ANSWER ✓ LED that emits light perpendicular to the
semiconductor chip. Most LEDs used in data communications are this type.
Step index fiber - ANSWER ✓ This is a multimode fiber where the core is all the
same index of refraction.
Steady State Modal Distribution - ANSWER ✓ Equilibrium modal distribution
(EMD) in multimode fiber (achieved some distance from the source) where the
relative power in the modes becomes stable with increasing distance.
Splitting Ratio - ANSWER ✓ The distribution of power among the output fibers
of a coupler.
Splice (fusion or mechanical) - ANSWER ✓ A device that provides for a
permanent connection between two fibers.
Source - ANSWER ✓ A laser diode or LED used to inject an optical signal into
fiber
