Question 1

What is the broadening of a light pulse due to the different propagation velocities of the X and Y polarization components of the light pulse called?

Accepted Answer

A) Modal dispersion 
B) Polarization mode dispersion 
C) Chromatic dispersion 
D) Diffusion B

Question 2

How many DS-3 signals is one OC-1 capable of carrying?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 A

Question 3

When there is an abrupt change in the refractive index from the core to the cladding in fibers,this is:

Accepted Answer

A) Due to the actual guided optical power 
B) Called step-index fiber 
C) Used for zero dispersion applications 
D) Also called graded index B

Question 4

What bit rate is possible when an OC-1 is carrying a DS-3 signal?

Accepted Answer

A) 51.84Mbps 
B) 100Mbps 
C) 300Mbps 
D) 500Mbps

Question 5

"Step index" refers to which of the following?

Accepted Answer

A) The abrupt change in the refractive index from core to cladding 
B) The abrupt change in the refractive index for the core 
C) The abrupt change in the graded index from core to cladding 
D) The abrupt change in the graded index for the core

Question 6

Conventional high-speed Ethernet networks operating over fiber are which of the following?

Accepted Answer

A) Of limited use in modern LANs 
B) Being replaced by SONET 
C) Called optical Ethernet 
D) Being replaced by ATM

Question 7

Graded-index fiber was developed to do which of the following?

Accepted Answer

A) Overcome OH peaks 
B) Increase bandwidth 
C) Overcome pulse-dispersion problems 
D) Enable WDM applications

Question 8

When SONET is in use,what happens to the signal when it is with the optical carrier?

Accepted Answer

A) It is encrypted. 
B) It is boosted. 
C) It is cleaned. 
D) It is encapsulated.

Question 9

DWDM does which of the following?

Accepted Answer

A) Incorporates the propagation of several wavelengths in the 1550-nm range for a single fiber 
B) Incorporates the propagation of several wavelengths in the 1350-nm range for a single fiber 
C) Incorporates the propagation of several wavelengths in the 850-nm range for a single fiber 
D) All of these answers are correct.

Question 10

What is the broadening of a pulse due to the different propagation of the spectral components of the light pulse called?

Accepted Answer

A) Chromatic dispersion 
B) Modal dispersion 
C) Polarization mode dispersion 
D) Diffusion

Question 11

What is a measure of a fiber's light acceptance?

Accepted Answer

A) Dispersion 
B) Numerical aperture 
C) Refractive index 
D) Mode field diameter

Question 12

A 50/125 fiber is used for single-mode applications.

Accepted Answer

A) True 
 B)False

Question 13

What is the optical patch panel used to interconnect fiber cables called?

Accepted Answer

A) Fiber splice 
B) Optical combiner 
C) Fiber cross-connect 
D) Optical splitter

Question 14

What are the light waves just below the frequencies in the visible spectrum extending up called?

Accepted Answer

A) Sub-light waves 
B) Refractive waves 
C) Multimode waves 
D) Infrared light waves 
E) Polar waves

Question 15

Single-mode fiber cables have a core diameter of about 7-10 micrometers.

Accepted Answer