FOA CFOT LATEST 2026 TEST PAPER QUESTIONS AND
ANSWERS GUARANTEE A+
✔✔Mode filter - ✔✔Device that removes optical power in higher order modes in fiber.
✔✔Mode field diamter - ✔✔Measure of the core size in singlemode fiber.
✔✔Modal dispersion - ✔✔Temporal spreading of pulse in optical waveguide caused by
modal effects.
✔✔Micron (*m) - ✔✔Used to measure wavelength of light and diameter of fiber
✔✔Mechanical Splice - ✔✔Semi-permanent connection between two fibers made with
adhesive and an alignment device.
✔✔Margin - ✔✔The additional amount of loss that can be tolerated in a link.
✔✔Loss Budget - ✔✔Amount of power lost in the link.Often used as the maximum
amount of loss that can be tolerated by a given link.
✔✔Optical Loss - ✔✔Amount of optical power lost as light is transmitted through fiber,
splices, couplers, etc.
✔✔Long Wavelength - ✔✔Light in the 1300 and 1550 nm ranges can be described as
this.
✔✔Fiber Optic Link - ✔✔Combination of transmitter, receiver and fiber optic cable
capable of transmitting data. May be analog or digital.
✔✔Light-emitting Diode (LED) - ✔✔Semiconductor device that emits light when
stimulated by electrical current. Used in Transmitters for Multimode fiber links.
✔✔Launch Cable - ✔✔Known good fiber optic jumper cable used as a reference cable
for loss testing. Must match fiber and connectors of tested cables.
✔✔Jumper Cable - ✔✔A short, single fiber cable with connectors on both ends used for
interconnecting other cables or testing.
✔✔Jacket - ✔✔The protective outer coating of the cable.
✔✔Insertion Loss - ✔✔Loss caused by the insertion of a component such as a splice or
connector in an optical fiber.
✔✔Index Profile - ✔✔The refractive index of a fiber as a function of cross section.
, ✔✔Index Matching Fluid - ✔✔A liquid used to match the materials at the ends of two
fibers to reduce loss and back reflection.
✔✔Index (of refraction) - ✔✔A measure of the speed of light in a material.
✔✔Graded Index - ✔✔A type of multimode fiber which used a graded profile of
refractive index in the core material to correct for dispersion.
✔✔Fusion Splicer - ✔✔An instrument that splices fibers by fusing or welding them,
typically by electrical arc.
✔✔FTTH - ✔✔Fiber to the Home
✔✔Fresnel Reflection/Back Reflection/Optical Return Loss - ✔✔Light reflected from
cleaved or polished end of fiber caused by difference of refractive indices of air and
glass. Typically 4% of incident light.
✔✔Fiber Identifier - ✔✔Device that clamps onto a fiber and couples light from the fiber
by bending, identifying the fiber (amongst others in a bundle, for example) by detecting
high speed traffic of an operating link or 2kHz tone injected by a test source.
✔✔Fiber Tracer - ✔✔An instrument that couples visible light into the fiber to allow visual
checking of continuity and tracing for correct connections.
✔✔Ferrule - ✔✔Precision tube which holds a fiber for alignment for interconnection.
Typically made from ceramics and is white in color.
✔✔Fiber Amplifier - ✔✔Uses erbium or other doped fibers and pump lasers to increase
signal output power without electronic conversion.
✔✔Excess Loss - ✔✔Amount of light lost in a coupler, beyond what is typical in the
splitting to multiple output fibers.
✔✔ESCON - ✔✔IBM standard for connecting peripherals to a computer over fiber
optics.
✔✔Equilibrium Modal Distribution (EMD) - ✔✔Steady state modal distribution in
multimode fiber, achieved some distance from the source, where the relative power in
the modes becomes stable with increasing distance.
✔✔End Finish - ✔✔Quality of the end surface of a fiber prepared for splicing or
terminated in a connector.
ANSWERS GUARANTEE A+
✔✔Mode filter - ✔✔Device that removes optical power in higher order modes in fiber.
✔✔Mode field diamter - ✔✔Measure of the core size in singlemode fiber.
✔✔Modal dispersion - ✔✔Temporal spreading of pulse in optical waveguide caused by
modal effects.
✔✔Micron (*m) - ✔✔Used to measure wavelength of light and diameter of fiber
✔✔Mechanical Splice - ✔✔Semi-permanent connection between two fibers made with
adhesive and an alignment device.
✔✔Margin - ✔✔The additional amount of loss that can be tolerated in a link.
✔✔Loss Budget - ✔✔Amount of power lost in the link.Often used as the maximum
amount of loss that can be tolerated by a given link.
✔✔Optical Loss - ✔✔Amount of optical power lost as light is transmitted through fiber,
splices, couplers, etc.
✔✔Long Wavelength - ✔✔Light in the 1300 and 1550 nm ranges can be described as
this.
✔✔Fiber Optic Link - ✔✔Combination of transmitter, receiver and fiber optic cable
capable of transmitting data. May be analog or digital.
✔✔Light-emitting Diode (LED) - ✔✔Semiconductor device that emits light when
stimulated by electrical current. Used in Transmitters for Multimode fiber links.
✔✔Launch Cable - ✔✔Known good fiber optic jumper cable used as a reference cable
for loss testing. Must match fiber and connectors of tested cables.
✔✔Jumper Cable - ✔✔A short, single fiber cable with connectors on both ends used for
interconnecting other cables or testing.
✔✔Jacket - ✔✔The protective outer coating of the cable.
✔✔Insertion Loss - ✔✔Loss caused by the insertion of a component such as a splice or
connector in an optical fiber.
✔✔Index Profile - ✔✔The refractive index of a fiber as a function of cross section.
, ✔✔Index Matching Fluid - ✔✔A liquid used to match the materials at the ends of two
fibers to reduce loss and back reflection.
✔✔Index (of refraction) - ✔✔A measure of the speed of light in a material.
✔✔Graded Index - ✔✔A type of multimode fiber which used a graded profile of
refractive index in the core material to correct for dispersion.
✔✔Fusion Splicer - ✔✔An instrument that splices fibers by fusing or welding them,
typically by electrical arc.
✔✔FTTH - ✔✔Fiber to the Home
✔✔Fresnel Reflection/Back Reflection/Optical Return Loss - ✔✔Light reflected from
cleaved or polished end of fiber caused by difference of refractive indices of air and
glass. Typically 4% of incident light.
✔✔Fiber Identifier - ✔✔Device that clamps onto a fiber and couples light from the fiber
by bending, identifying the fiber (amongst others in a bundle, for example) by detecting
high speed traffic of an operating link or 2kHz tone injected by a test source.
✔✔Fiber Tracer - ✔✔An instrument that couples visible light into the fiber to allow visual
checking of continuity and tracing for correct connections.
✔✔Ferrule - ✔✔Precision tube which holds a fiber for alignment for interconnection.
Typically made from ceramics and is white in color.
✔✔Fiber Amplifier - ✔✔Uses erbium or other doped fibers and pump lasers to increase
signal output power without electronic conversion.
✔✔Excess Loss - ✔✔Amount of light lost in a coupler, beyond what is typical in the
splitting to multiple output fibers.
✔✔ESCON - ✔✔IBM standard for connecting peripherals to a computer over fiber
optics.
✔✔Equilibrium Modal Distribution (EMD) - ✔✔Steady state modal distribution in
multimode fiber, achieved some distance from the source, where the relative power in
the modes becomes stable with increasing distance.
✔✔End Finish - ✔✔Quality of the end surface of a fiber prepared for splicing or
terminated in a connector.
