FIBER OPTICS CORE EXAM TEST QUESTIONS AND
ANSWERS GUARANTEE A+
✔✔The ? protects the fiber from harm. - ✔✔Aramid fiber strength members, Jacket,
Primary buffer coating
✔✔Which fiber-optic test instrument uses backscattered light for measurements? -
✔✔Optical time-domain reflectometer (OTDR)
✔✔The wavelength of light used for most fiber-optic systems is in the ? region and ? to
the human eye. - ✔✔infrared / invisible
✔✔The biggest advantage of optical fiber is the fact it is the most cost effective means
of transporting information. - ✔✔True
✔✔Telephone networks have been converted to fiber, including long distance and
metropolitan networks, but fiber to the home (FTTH) is not yet feasible. - ✔✔False
✔✔In an industrial environment, fiber is most often used to ? . - ✔✔Prevent
electromagnetic interference
✔✔Which of the following are NOT necessary in a centralized fiber-optic cabling
architecture? - ✔✔Repeaters or Hubs
✔✔Copper networks can be converted to fiber optics using ? . - ✔✔Media Converters
✔✔The bandwidth and distance capability of optical fiber means that ? . - ✔✔Fewer
Cables are needed, fewer repeaters are needed, less maintenance is required, less
power is consumed by the network.
✔✔Which of the following communications systems typically use fiber-optic backbones?
- ✔✔CATV, Cell Phones, Internet, Telephones
✔✔Fiber optics is used in cars to connect their electronic systems. - ✔✔True
✔✔Fiber-optic links generally use two fibers for full duplex (bidirectional) links. - ✔✔True
✔✔Light-emitting diodes (LEDs) have higher output power and bandwidth than lasers. -
✔✔False
✔✔Multimode fiber systems operating at speeds of one gigabit per second or more use
? sources. - ✔✔Vertical-cavity surface-emitting laser (VCSEL)
, ✔✔The ? of a laser makes the effective bandwidth of multimode fiber higher than with
LEDs. - ✔✔Restricted Modal Launch
✔✔Short wavelength 850-nanometer links can use ? detectors in the receiver. -
✔✔Silicon
✔✔Long wavelength single-mode links at wavelengths in the range of 1,300-1,650
nanometer links must use ? detectors in the receiver for the best sensitivity
performance. - ✔✔InGaAs
✔✔Fiber amplifiers and dense wavelength division multiplexers (DWDM) work in the ?
wavelength range. - ✔✔1,480-1,650
✔✔Single-mode transceivers use ? sources for their higher coupled power and
bandwidth. (Choose all that apply.) - ✔✔DFB Laser and F-P Laser
✔✔Multimode transceivers use ? sources depending on their requirements for coupled
power and bandwidth. - ✔✔LED and VCSEL
✔✔Single-mode (SM) fiber has ? light-carrying core than(as) multimode (MM) fiber. -
✔✔a smaller
✔✔What is the core size of single-mode fiber? - ✔✔9 microns
✔✔Single-mode fiber has ? bandwidth than(as) multimode fiber. - ✔✔more
✔✔What wavelengths are appropriate for use with multimode fiber? - ✔✔850 and 1,300
nm
✔✔The diameter of the core in OM2 and OM3 multimode fiber is how large? - ✔✔50
Microns
✔✔Which of the following fiber specifications is most important to the user and is an
important factor in testing? - ✔✔Attenuation
✔✔The largest contributor to fiber attenuation is ? . - ✔✔Scattering
✔✔Which fiber typically has the largest core? - ✔✔Plastic Optical Fiber (POF)
✔✔The loss of a multimode graded index fiber is greatest at ? . - ✔✔850 nm
✔✔Which type of dispersion affects single-mode fiber as well as multimode fiber? -
✔✔Chromatic
ANSWERS GUARANTEE A+
✔✔The ? protects the fiber from harm. - ✔✔Aramid fiber strength members, Jacket,
Primary buffer coating
✔✔Which fiber-optic test instrument uses backscattered light for measurements? -
✔✔Optical time-domain reflectometer (OTDR)
✔✔The wavelength of light used for most fiber-optic systems is in the ? region and ? to
the human eye. - ✔✔infrared / invisible
✔✔The biggest advantage of optical fiber is the fact it is the most cost effective means
of transporting information. - ✔✔True
✔✔Telephone networks have been converted to fiber, including long distance and
metropolitan networks, but fiber to the home (FTTH) is not yet feasible. - ✔✔False
✔✔In an industrial environment, fiber is most often used to ? . - ✔✔Prevent
electromagnetic interference
✔✔Which of the following are NOT necessary in a centralized fiber-optic cabling
architecture? - ✔✔Repeaters or Hubs
✔✔Copper networks can be converted to fiber optics using ? . - ✔✔Media Converters
✔✔The bandwidth and distance capability of optical fiber means that ? . - ✔✔Fewer
Cables are needed, fewer repeaters are needed, less maintenance is required, less
power is consumed by the network.
✔✔Which of the following communications systems typically use fiber-optic backbones?
- ✔✔CATV, Cell Phones, Internet, Telephones
✔✔Fiber optics is used in cars to connect their electronic systems. - ✔✔True
✔✔Fiber-optic links generally use two fibers for full duplex (bidirectional) links. - ✔✔True
✔✔Light-emitting diodes (LEDs) have higher output power and bandwidth than lasers. -
✔✔False
✔✔Multimode fiber systems operating at speeds of one gigabit per second or more use
? sources. - ✔✔Vertical-cavity surface-emitting laser (VCSEL)
, ✔✔The ? of a laser makes the effective bandwidth of multimode fiber higher than with
LEDs. - ✔✔Restricted Modal Launch
✔✔Short wavelength 850-nanometer links can use ? detectors in the receiver. -
✔✔Silicon
✔✔Long wavelength single-mode links at wavelengths in the range of 1,300-1,650
nanometer links must use ? detectors in the receiver for the best sensitivity
performance. - ✔✔InGaAs
✔✔Fiber amplifiers and dense wavelength division multiplexers (DWDM) work in the ?
wavelength range. - ✔✔1,480-1,650
✔✔Single-mode transceivers use ? sources for their higher coupled power and
bandwidth. (Choose all that apply.) - ✔✔DFB Laser and F-P Laser
✔✔Multimode transceivers use ? sources depending on their requirements for coupled
power and bandwidth. - ✔✔LED and VCSEL
✔✔Single-mode (SM) fiber has ? light-carrying core than(as) multimode (MM) fiber. -
✔✔a smaller
✔✔What is the core size of single-mode fiber? - ✔✔9 microns
✔✔Single-mode fiber has ? bandwidth than(as) multimode fiber. - ✔✔more
✔✔What wavelengths are appropriate for use with multimode fiber? - ✔✔850 and 1,300
nm
✔✔The diameter of the core in OM2 and OM3 multimode fiber is how large? - ✔✔50
Microns
✔✔Which of the following fiber specifications is most important to the user and is an
important factor in testing? - ✔✔Attenuation
✔✔The largest contributor to fiber attenuation is ? . - ✔✔Scattering
✔✔Which fiber typically has the largest core? - ✔✔Plastic Optical Fiber (POF)
✔✔The loss of a multimode graded index fiber is greatest at ? . - ✔✔850 nm
✔✔Which type of dispersion affects single-mode fiber as well as multimode fiber? -
✔✔Chromatic
