Name: 
 

Fiber Optic Update



True/False
Indicate whether the statement is true or false.
 

 1. 

Optical loss measured in dB is always a negative number because lower power is a more negative number in a logarithmic scale like dB.
 

 2. 

While we say a cable plant has 7dB lloss, the optical loss measured in dB is  a negative number because lower power is a more negative number in a logarithmic scale like dB.
 

 3. 

People erroneously think that you strip the cladding from glass optical fiber becasue practically every drawing of fiber shows the core separate from the cladding, indicating they are separate.
 

 4. 

Microcables with 144 fibers are about the size of a pencil.
 

 5. 

A power budget is the amount of optical loss the link electronics can tolerate - transmitter to receiver.
 

 6. 

Nanotrenching was a great success for Google Fiber in Louisville, saving installation cost and providing a long-lasting reliable installation.
 

 7. 

Even if one connector ferrule end face is dirty, it will not transfer to another connector or contaminate any connector it is mated to.
 

 8. 

There have been new connectors introduced but none smaller than the current LC.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 9. 

If you measure a change in optical power where the new power is 10 times higher than the first measurement, the dB difference is _______.
a.
+10dB
b.
-10dB
c.
0dB
d.
+10dBm
 

 10. 

If you are measuring loss of a cable plant that has 7dB loss and your meter reference is -15dBm, what will the power reading be after the loss?
a.
-15dBm
b.
-8dBm
c.
-22dBm
d.
-15.7dBm
 

 11. 

The 2-cable reference method for making insertion loss measurements ________.
a.
Includes a connection loss when making the “0dB” reference
b.
Measures a loss lower by the loss of the connection when setting the “0dB” reference
c.
Has higher measurement uncertainty than a 1-cable reference
d.
All of the above
 

 12. 

When you strip optical fiber to splce or terminate it, you are stripping off the ___________.
a.
Core
b.
Cladding
c.
Buffer coating
d.
Both the cladding and the buffer
 

 13. 

LANs and data links in data centers are moving to singlemode fiber because __________.
a.
Network speeds are too high for multimode fiber
b.
LANs are getting bigger and links are longer
c.
Multimode fiber is in short supply
d.
You can get more singlemode fiber in small cables
 

 14. 

What kind of fiber is this?
mc014-1.jpg
a.
OM5 wideband fiber
b.
50/125 bend-insensitive fiber
c.
Legacy OM1 fber
d.
Singlemode
 

 15. 

Signals traveling in optical fiber are traveling at the “speed of light” indicated by the letter “C,” but in an optical fiber that speed is really _________________.
a.
C =300,000 km/s
b.
About 2/3C = 205,000 km/s or C/index of refraction of glass
c.
The speed of light in a vacuum
d.
Faster than a speedling bullet
 

 16. 

Splice-on connectors use a ________ for termination.
a.
Fusion splicer
b.
Mass fusion splicer
c.
Mechancal splice
d.
Epoxy/polish termination
 

 17. 

Regular (not bend-insensitive) singlemode fiber is most sensitive to bending losses at ___________ wavelength.
a.
850
b.
1310
c.
1550
d.
1625
 

 18. 

On high fiber count cables, ribbon splicing wil be about ____ times faster than single fiber splicing
a.
2
b.
6
c.
10
d.
20
 

Multiple Response
Identify one or more choices that best complete the statement or answer the question.
 

 19. 

A link loss budget for a fiber optic link will include _________. (Choose all that are included in a loss budget..)
 a.
Loss of the fiber - attenuation coefficient times length
 b.
Splice losses
 c.
Connection losses
 d.
Bandwidth
 

 20. 

High fiber count cables are generally made with ________ . (Check all answers that are correct.)
 a.
Smaller 200 micron buffer fiber
 b.
Ribbons
 c.
Flex ribbons
 d.
Either singlemode or multmode fiber
 



 
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