Name: 
 

Datalink



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

 1. 

Fiber optic links generally use two fibers for full duplex (bidirectional) links.
 

 2. 

LEDs have higher output power and bandwidth than lasers.
 

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

 3. 

Multimode fiber systems operation at speeds of 1 Gb/s or more use ____ sources.
A.
LED
B.
VCSEL
C.
F-P laser
D.
DFB laser
 

 4. 

The ________ of a laser makes the effective bandwidth of multimode fiber higher than with LEDs.
A.
Restricted modal launch
B.
Higher power
C.
Lower power
D.
Bandwidth
 

 5. 

Short wavelength 850 nm links can use ______detectors in the receiver.
A.
Silicon
B.
Germanium
C.
InGaAs
 

 6. 

Long wavelength singlemode links at  wavelengths in the range of 1300-1650 nm links must use ______detectors in the receiver for the best sensitivity performance.
A.
Silicon
B.
Germanium
C.
InGaAs
 

 7. 

Fiber amplifiers and DWDM work in the ______ wavelength range.
A.
650-850
B.
850-1300
C.
1300-1550
D.
1480-1650
 

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

 8. 

Singlemode transceivers use _____ sources for their higher coupled power and bandwidth.
 A.
LED
 B.
VCSEL
 C.
F-P lasers
 D.
DFB lasers
 

 9. 

Multimode transceivers use _____ sources depending on their requirements for coupled power and bandwidth.
 A.
LED
 B.
VCSEL
 C.
F-P lasers
 D.
DFB lasers
 



 
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