FIBER OPTICS FINAL EXAM UPDATED QUESTIONS AND
ANSWERS GUARANTEE A+
✔✔shorter wavelength - ✔✔rayleigh scattering decreases with ________ light waves
✔✔Graded Index Fiber - ✔✔fiber optic cable constructed by layers of increasing index
of refraction core material
✔✔single mode fiber - ✔✔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 - ✔✔has smaller core so it is particular about light frequency
✔✔modal dispersion - ✔✔doesn't exist in single mode fiber (zig-zag flatlines out)
✔✔must go slower but greater distance - ✔✔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 - ✔✔fiber number 1
✔✔orange - ✔✔fiber number 2
✔✔green - ✔✔fiber number 3
✔✔brown - ✔✔fiber number 4
✔✔slate - ✔✔fiber numer 5
✔✔white - ✔✔fiber number 6
✔✔red - ✔✔fiber number 7
✔✔black - ✔✔fiber number 8
✔✔yellow - ✔✔fiber number 9
✔✔violet - ✔✔fiber number 10
✔✔rose - ✔✔fiber number 11
✔✔aqua - ✔✔fiber number 12
, ✔✔characteristics that affect light propagation down fibers - ✔✔size of the fiber,
composition of the fiber, light injected into the fiber
✔✔swept cable - ✔✔tells exactly what loss will be down it
✔✔glass fiber - ✔✔glass core & glass cladding
✔✔PCS (plastic clad silica) - ✔✔glass core and plastic cladding
✔✔plastic fiber - ✔✔plastic core and plastic cladding (cheaper, more flexible, more
durable, but more loss)
✔✔modes - ✔✔can be simplified to mean the number of potential paths for a light ray to
travel down a fiber
✔✔multimode step index - ✔✔simplest type of fiber; core diameter from 100-970 um
and includes glass, PCS, & plastic; light zig-zags down the fiber with many possible
paths; pulse spreading results because of so many different possible paths
✔✔modal dispersion - ✔✔spreading of signal, "zig-zagging" of the wave
✔✔graded-index fiber - ✔✔fiber made up of many concentric layers of glass designed
to bend the light towards the center core; reduces modal dispersion to 1 ns/km; core
diameter 50, 62.5, or 85 um; cladding of 125 um
✔✔graded-index fiber - ✔✔highest quality, expense in installation, different light lengths
allow it to arrive faster
✔✔single mode fiber - ✔✔cladding must be 10x as thick as core; one path only so no
modal dispersion; 417-1700 Mbps & still cost effective; different fibers designed for
different light wavelenths
✔✔higher frequency - ✔✔more attenuation
✔✔fiber performance from lowest to highest - ✔✔plastic - plastic coated silica (PCS) -
step index glass - graded index - single mode
✔✔smaller core - ✔✔usually means better performance
✔✔glass fibers - ✔✔perform better than plastic fibers
✔✔modal dispersion - ✔✔occurs only in multimode fibers
ANSWERS GUARANTEE A+
✔✔shorter wavelength - ✔✔rayleigh scattering decreases with ________ light waves
✔✔Graded Index Fiber - ✔✔fiber optic cable constructed by layers of increasing index
of refraction core material
✔✔single mode fiber - ✔✔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 - ✔✔has smaller core so it is particular about light frequency
✔✔modal dispersion - ✔✔doesn't exist in single mode fiber (zig-zag flatlines out)
✔✔must go slower but greater distance - ✔✔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 - ✔✔fiber number 1
✔✔orange - ✔✔fiber number 2
✔✔green - ✔✔fiber number 3
✔✔brown - ✔✔fiber number 4
✔✔slate - ✔✔fiber numer 5
✔✔white - ✔✔fiber number 6
✔✔red - ✔✔fiber number 7
✔✔black - ✔✔fiber number 8
✔✔yellow - ✔✔fiber number 9
✔✔violet - ✔✔fiber number 10
✔✔rose - ✔✔fiber number 11
✔✔aqua - ✔✔fiber number 12
, ✔✔characteristics that affect light propagation down fibers - ✔✔size of the fiber,
composition of the fiber, light injected into the fiber
✔✔swept cable - ✔✔tells exactly what loss will be down it
✔✔glass fiber - ✔✔glass core & glass cladding
✔✔PCS (plastic clad silica) - ✔✔glass core and plastic cladding
✔✔plastic fiber - ✔✔plastic core and plastic cladding (cheaper, more flexible, more
durable, but more loss)
✔✔modes - ✔✔can be simplified to mean the number of potential paths for a light ray to
travel down a fiber
✔✔multimode step index - ✔✔simplest type of fiber; core diameter from 100-970 um
and includes glass, PCS, & plastic; light zig-zags down the fiber with many possible
paths; pulse spreading results because of so many different possible paths
✔✔modal dispersion - ✔✔spreading of signal, "zig-zagging" of the wave
✔✔graded-index fiber - ✔✔fiber made up of many concentric layers of glass designed
to bend the light towards the center core; reduces modal dispersion to 1 ns/km; core
diameter 50, 62.5, or 85 um; cladding of 125 um
✔✔graded-index fiber - ✔✔highest quality, expense in installation, different light lengths
allow it to arrive faster
✔✔single mode fiber - ✔✔cladding must be 10x as thick as core; one path only so no
modal dispersion; 417-1700 Mbps & still cost effective; different fibers designed for
different light wavelenths
✔✔higher frequency - ✔✔more attenuation
✔✔fiber performance from lowest to highest - ✔✔plastic - plastic coated silica (PCS) -
step index glass - graded index - single mode
✔✔smaller core - ✔✔usually means better performance
✔✔glass fibers - ✔✔perform better than plastic fibers
✔✔modal dispersion - ✔✔occurs only in multimode fibers
