FIBER OPTICS EXAM QUESTIONS WITH
CORRECT ANSWERS
Mode Field Diameter - Answer-The diameter of the light emerging from the end of the
fiber is also termed...
core, cladding, and prime coating - Answer-The basic construction of fiber is:
zig-zag - Answer-A multimode step-index fiber transmits light down the fiber in what
pattern?
Single-Mode - Answer-This type of fiber has only one mode for the light to travel down.
glass core and plastic cladding - Answer-Plastic-clad silica cables have what kind of
construction?
material dispersion - Answer-different wavelengths travel at different speeds along the
same path
5-10 micrometers - Answer-the typical core diameter range for single-mode fiber optic
cables
125 micrometers - Answer-typically the cladding of a fiber, regardless of its core size is
what diameter?
waveguide dispersion - Answer-a singe wavelength travels at different speeds in
different materials
.50 km - Answer-if you are using a fiber optic cable that is designed to transmit 600 MHz
for a distance of .75 km, how far could an 800 MHz signal travel on the same cable
microbend loss - Answer-little bumps in the core at the junction of the core and cladding
are called?
frequency goes up - Answer-distance goes down
attenuation - Answer-dB/Km is how ________ of optical power is measured
numerical aperature - Answer-The _______ ________ of the optical source, fiber, and
optical receiver must match for best transmission
tight buffer - Answer-allows a lower tensile strength but a higher impact and crush
resistance
, plenum-duty fiber - Answer-type fiber used if you are installing it in a return air vent /
space in a building
strength members - Answer-the part of the fiber optic cable that allows you to pull it
when you are installing it
MHz per Km - Answer-many manufacturers specify bandwidth-length in ______ instead
of specifying dispersion in the modal offerings
300 dB/Km - Answer-plastic fiber would have an attenuation in the range of
shorter wavelength - Answer-rayleigh scattering decreases with ________ light waves
Graded Index Fiber - Answer-fiber optic cable constructed by layers of increasing index
of refraction core material
single mode fiber - Answer-when using ________ fiber optic cable you must worry
about matching the cable to the frequency of the light you are transmitting more than
other types of cable
single mode fiber - Answer-has smaller core so it is particular about light frequency
modal dispersion - Answer-doesn't exist in single mode fiber (zig-zag flatlines out)
must go slower but greater distance - Answer-in a single mode fiber optic cable, you
can send a 1300nm wavelength faster but for a shorter distance, what would be the
effect if you would send a 1500nm wavelength down this same cable?
blue - Answer-fiber number 1
orange - Answer-fiber number 2
green - Answer-fiber number 3
brown - Answer-fiber number 4
slate - Answer-fiber numer 5
white - Answer-fiber number 6
red - Answer-fiber number 7
black - Answer-fiber number 8
yellow - Answer-fiber number 9
CORRECT ANSWERS
Mode Field Diameter - Answer-The diameter of the light emerging from the end of the
fiber is also termed...
core, cladding, and prime coating - Answer-The basic construction of fiber is:
zig-zag - Answer-A multimode step-index fiber transmits light down the fiber in what
pattern?
Single-Mode - Answer-This type of fiber has only one mode for the light to travel down.
glass core and plastic cladding - Answer-Plastic-clad silica cables have what kind of
construction?
material dispersion - Answer-different wavelengths travel at different speeds along the
same path
5-10 micrometers - Answer-the typical core diameter range for single-mode fiber optic
cables
125 micrometers - Answer-typically the cladding of a fiber, regardless of its core size is
what diameter?
waveguide dispersion - Answer-a singe wavelength travels at different speeds in
different materials
.50 km - Answer-if you are using a fiber optic cable that is designed to transmit 600 MHz
for a distance of .75 km, how far could an 800 MHz signal travel on the same cable
microbend loss - Answer-little bumps in the core at the junction of the core and cladding
are called?
frequency goes up - Answer-distance goes down
attenuation - Answer-dB/Km is how ________ of optical power is measured
numerical aperature - Answer-The _______ ________ of the optical source, fiber, and
optical receiver must match for best transmission
tight buffer - Answer-allows a lower tensile strength but a higher impact and crush
resistance
, plenum-duty fiber - Answer-type fiber used if you are installing it in a return air vent /
space in a building
strength members - Answer-the part of the fiber optic cable that allows you to pull it
when you are installing it
MHz per Km - Answer-many manufacturers specify bandwidth-length in ______ instead
of specifying dispersion in the modal offerings
300 dB/Km - Answer-plastic fiber would have an attenuation in the range of
shorter wavelength - Answer-rayleigh scattering decreases with ________ light waves
Graded Index Fiber - Answer-fiber optic cable constructed by layers of increasing index
of refraction core material
single mode fiber - Answer-when using ________ fiber optic cable you must worry
about matching the cable to the frequency of the light you are transmitting more than
other types of cable
single mode fiber - Answer-has smaller core so it is particular about light frequency
modal dispersion - Answer-doesn't exist in single mode fiber (zig-zag flatlines out)
must go slower but greater distance - Answer-in a single mode fiber optic cable, you
can send a 1300nm wavelength faster but for a shorter distance, what would be the
effect if you would send a 1500nm wavelength down this same cable?
blue - Answer-fiber number 1
orange - Answer-fiber number 2
green - Answer-fiber number 3
brown - Answer-fiber number 4
slate - Answer-fiber numer 5
white - Answer-fiber number 6
red - Answer-fiber number 7
black - Answer-fiber number 8
yellow - Answer-fiber number 9
