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ETA-I Study Guide (Fiber Optics Installer
Certification) (FOI) Latest Update
Graded A+
An optical fiber works based off of a principle known as; ✔✔Total Internal Reflection.
The bending of light as it passes from one transparent material into another which has a different refractive index is what? ✔✔Refraction.
Light is electromagnetic radiation in the wavelength range including visible, ultraviolet, X-rays and _______________. ✔✔Infrared.
What are the three parts of a typical optical fiber? ✔✔Core, Cladding, buffer Coating. (3 C's)
A simple fiber optic system consists of what four components? ✔✔Transmitter, receiver, fiber, and connector.
Which optical fiber is most suited for very high speed and long distance applications? ✔✔Single-mode.
The reduction of power as a signal passes through a system is called (Also known as signal loss); ✔✔Attenuation.
A fiber optic cable which has single-mode and multi-mode optical fibers is what kind of cable? ✔✔Hybrid.
A fiber with it's core having numerous concentric layers of glass, with each layer having a lower index of refraction is what kind of fiber? What is the core size and how is it identified now? ✔✔Multi-mode graded-index.
The spreading of light pulses as they take different paths in traveling down a fiber is known as what? ✔✔Modal Dispersion.
What are the two widely used methods for installing buried fiber optic cables? ✔✔Trench and Plow methods.
What configurations should be used when the center pull or backfeeding techniques are used to pull in cables? ✔✔Figure 8's.
Which connector comes pre-loaded with epoxy? ✔✔Hot melt.
Why are LED sources the most common type used for testing purposes? ✔✔Long life and low cost.
What is the most common application for light sources and power meters? ✔✔End to end attenuation testing.
What is the formula used to convert dBm to dB? ✔✔Subtract dBm in, from dBm out
What must be established prior to measuring loss when using the light source and power meter? ✔✔A reference point or zero reference.
What are the three basic approaches to modal conditioning used to achieve or simulate EMD when testing multimode fiber? ✔✔Optical, long fiber, filtering approach.
The Fibrlok II mechanical splice will accommodate single-mode or multimode fibers that have what diameter cladding? ✔✔ 125 μm.
What is the insertion loss for the Fibrlok II mechanical splice? ✔✔Less than .1 dB.
What is the safest and most efficient method of removing fiber buffer? ✔✔Mechanical buffer strippers.
The Fibrlok II mechanical splices are filled with what to maximize light transfer and reduce Fresnel reflections? ✔✔Index matching gel.
When applying a cable cleaner to remove water resistant compound, how should the technician work? ✔✔The jacket end toward the cable end.
Patch panels provide a central location for cross-connecting, monitoring, and _______________. ✔✔Testing.
When installing patch panels located in equipment rooms, how are they normally mounted? ✔✔Rack.
What are the two types of automatic fusion splicers? ✔✔LID and PAS.
The space following a Fresnel reflection in which the high return level of the reflection covers up the backscatter (blinds the OTDR) is known as what? ✔✔Dead zone.
What setting on the OTDR must be set correctly in order to obtain accurate LENGTH and LOSS measurements? ✔✔Index of Refraction (IOR).
What problem exists when two fibers are spliced and the backscatter level shifts up instead of down? ✔✔Gainer.
What are false reflections that show up at multiple distances from the initial reflection called? ✔✔Ghosts.
Microbends and macrobends appear as what kind of events? ✔✔Non-reflective -- just like a low loss splice would.
A fusion splice will appear as what kind of pulse? ✔✔Non-reflective.
What is the sum of all the individual losses from the beginning to the end of the fiber optic link? ✔✔Total attenuation.
When measuring loss of a fiber link, where do you measure from and measure to? ✔✔Left side of the pulse at the beginning of the link and the left side of the pulse at the far end of the link.
When measuring the loss of an individual event, where do you measure from and measure to? ✔✔Lef tside of the pulse representing the event, and just to the right side of the event.
When measuring total attenuation of a fiber optic link, it includes what three things? ✔✔Intrinsic factors of the fiber, splice loss, and connector loss.
What are the seven advantages of fiber optics? ✔✔High speed, Low Attenuation, EMI, Size, Weight, Safety, Security.
