Name: 
 

Basic Skills Lab - Testing


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

 1. 
Fiber optic inspection microscopes can focus the light in a fiber into the eye creating potentially harmful power levels.
 

 2. 
Angular or oblique inspection (from the side) of a fiber optic connector provides a better view of the finish of the end of the connector’s ferrule.
 

 3. 
New fiber optic cables in their orignal packaging with dust caps on the ferrules do not need inspection and claning before use.
 

 4. 
When measuring optical power, relative power like when measuring loss is expressed ad dB, while absolute power is measured in dBm.
 

 5. 
Power budget and loss budget are the same thing.
 

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

 6. 
Fiber optic connectors can be cleaned by several methods. Which one usually gives the best results.
a.
Wet
b.
Dry
c.
Wet-to-dry
d.
Just rub it on your shirt
 

 7. 
A dB change of 10 dB means power has changed by a factor of _________.
a.
3
b.
5
c.
10
d.
100
 

 8. 
When measuring optical loss from a 0dB reference, a power meter will display loss as a _________.
a.
Positive number
b.
Negative number
c.
Decimal value
d.
Watts
 

 9. 
To measure absolute optical power in dBm on an optical power meter, you need to know the _________ to calibrate the power meter.
a.
Power level
b.
0 dB level
c.
Source wavelength
d.
NBS standard
 

 10. 
If you measure a 10 milliwatt source with a power meter calibrated in dBm, the meter should read ___________.
a.
+ 10 dBm
b.
-  10 dBm
c.
0 dBm
d.
10 dB
 

 11. 
Consider the cable plant shown here:
mc011-1.jpg

If the fiber loss is 3dB/km, connection losses are 0.5dB  each and splices are 0.3 dB each, what is the loss of the cable plant on this link.
a.
3.3dB
b.
4.3dB
c.
2.85dB
d.
3.3dBm
 

 12. 
Consider the cable plant shown here:
mc012-1.jpg

The fiber loss is 3dB/km, connection losses are 0.5dB  each and splices are 0.3 dB each. .The transmitter output is -5dBm and the receiver requires at least -10dBm.

Will the link work on this cable plant.
a.
No
b.
Yes
c.
Depends on the wavelength
d.
Depends on the fiber
 

 13. 
When you test a splice in the cable plant and it shows a “gainer”, it should show _______ when tested in the opposite direction.
a.
No loss
b.
Gain also
c.
More loss than the actual splice loss
d.
The correct splice loss
 

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

 14. 
Visual fault locators all one to visually find faults like cable stress and connector or splice loss because _______. (Check all answers that are true.)
 a.
The red light is visible to the human eye
 b.
Loss in a cable stressed at a bend causes light to exit the fiber
 c.
Loss in a connector or splice causes light to exit the fiber
 d.
The red laser in a VFL is very high power to make it visible
 

 15. 
OTDRs are used with launch and receive cables in order to __________.(More than one answer may be true.)
 a.
Get past the OTDR dead zone
 b.
Reduce the errors caused by backscatter
 c.
Measure the loss of connectors on both ends of the cable plant
 d.
Protect the OTDR from overload
 

Matching
 
 
Match the instrument to the test performed:
a.
Inspection microscope
b.
Visual Fault Locator
c.
Optical Power Meter
d.
Light source and power meter (OLTS)
e.
OTDR
 

 16. 

 Testing installed cable plant     
 

 17. 

 Measuring cable plant length     
 

 18. 

 Finding cable breaks caused by dig-ups
 

 19. 

 Verifying splice loss in a concatenated cable plant     
 

 20. 

 Checking connector cleanliness
 

 21. 

 Finding stress/bending losses or breaks near the end of cables     
 

 22. 

 Measuring transmitter or receiver power in a link
 

 23. 

 Testing patchcords
 
 
When mesuring insertion loss, there are 3 methods to set a “0dB refrence.”  Why are there 3 methods and what is the difference in loss measured with the 3 methods?

grp002-1.jpg
a.
One cable reference
b.
Two cable reference
c.
Three cable reference
 

 24. 

 Used for standard connectors when they do not match the connectors on the test equipment
 

 25. 

 Used for standard connectors when they match the connectors on the test equipment
 

 26. 

 Used for plug/jack connectors like MPO or MIL multipin connectors
 

 27. 

 Test results will show lower loss because one connection is included in reference
 

 28. 

 Test results will show lowest loss because two connections are included in reference
 

 29. 

 Preferred reference method for most tests
 



 
Check Your Work     Start Over