Question 1

A jelly like substance that has an index of refraction much closer to the glass than air is called:

Accepted Answer

A)  index matching gel 
B)  alignment gel 
C)  splice gel 
D)  framing gel 
A)  index matching gel 
B)  alignment gel 
C)  splice gel 
D)  framing gel A

Question 2

Common synonymous terms for a fiber optic strand are: (select all that are correct)

Accepted Answer

A)  glass 
B)  light pipe 
C)  fiber 
D)  conduit 
A)  glass 
B)  light pipe 
C)  fiber 
D)  conduit A, B, C

Question 3

A dispersion compensating fiber

Accepted Answer

A)  yields close to zero dispersion in the 1550 nm region 
B)  acts like an equalizer 
C)  cancels dispersion effects 
D)  all of the above 
A)  yields close to zero dispersion in the 1550 nm region 
B)  acts like an equalizer 
C)  cancels dispersion effects 
D)  all of the above D

Question 4

The numerical aperture of a fiber:

Accepted Answer

A)  is a basic specification which indicates its ability to accept light and shows how much light can be off axis and still be propagated. 
B)  the acceptance angle where the output light is no greater than 10 db down from the peak value. 
C)  defines the half-angle of the cone of acceptance for propagated light in the fiber. 
D)  all of the above 
A)  is a basic specification which indicates its ability to accept light and shows how much light can be off axis and still be propagated. 
B)  the acceptance angle where the output light is no greater than 10 db down from the peak value. 
C)  defines the half-angle of the cone of acceptance for propagated light in the fiber. 
D)  all of the above

Question 5

Which of the following is an important characteristic of light detectors?

Accepted Answer

A)  response speed 
B)  dark current 
C)  responsivity 
D)  all of the above 
A)  response speed 
B)  dark current 
C)  responsivity 
D)  all of the above

Question 6

Pulse dispersion is mainly caused by:

Accepted Answer

A)  variable path lengths due to the light signal traveling down the fiber in different modes. 
B)  noise picked up by the light signal. 
C)  use of too high power, highly directional laser sources to generate the light signal. 
D)  excessive use of repeaters through the fiber optic cable length. 
A)  variable path lengths due to the light signal traveling down the fiber in different modes. 
B)  noise picked up by the light signal. 
C)  use of too high power, highly directional laser sources to generate the light signal. 
D)  excessive use of repeaters through the fiber optic cable length.

Question 7

A coherent light source is one that is:

Accepted Answer

A)  easy to decode 
B)  due to a defective laser 
C)  spectrally pure 
D)  easy to understand 
A)  easy to decode 
B)  due to a defective laser 
C)  spectrally pure 
D)  easy to understand

Question 8

The trapping of light in a fiber results from:

Accepted Answer

A)  dispersion 
B)  numerical aperture. 
C)  step index. 
D)  total internal reflection. 
A)  dispersion 
B)  numerical aperture. 
C)  step index. 
D)  total internal reflection.

Question 9

The term for incorporating the propagation of several wavelengths in the 1550nm range of a single fiber is called

Accepted Answer

A)  fiber bragg gating 
B)  dense wave length division multiplex 
C)  multiplexed fiber 
D)  distributed feedback 
A)  fiber bragg gating 
B)  dense wave length division multiplex 
C)  multiplexed fiber 
D)  distributed feedback

Question 10

A piece of test equipment that sends a light pulse down the fiber and measures the reflected light is called:

Accepted Answer

A)  reflecometer 
B)  an OTDR 
C)  TDR 
D)  light pulser 
A)  reflecometer 
B)  an OTDR 
C)  TDR 
D)  light pulser

Question 11

An estimation of how long a fiber optic cable can be for a given bit rate and dispersion for successful data communications to occur is referred to as:

Accepted Answer

A)  a frequency response. 
B)  a power budget. 
C)  a detector system check. 
D)  an error rate analysis. 
A)  a frequency response. 
B)  a power budget. 
C)  a detector system check. 
D)  an error rate analysis.

Question 12

Which of the following are typical wavelengths used in fiber optics?

Accepted Answer

A)  850 nm 
B)  1310 nm 
C)  1550 nm 
D)  A and C 
E)  all of the above 
A)  850 nm 
B)  1310 nm 
C)  1550 nm 
D)  A and C 
E)  all of the above

Question 13

Fiber cables with core diameters of about 7 to 10 m.

Accepted Answer

A)  multi mode 
B)  mode field 
C)  single mode 
D)  step-index 
A)  multi mode 
B)  mode field 
C)  single mode 
D)  step-index

Question 14

The amount of bending of the light into a material depends on the of that material:

Accepted Answer

A)  refractive index 
B)  reflective index 
C)  wavelength of light 
D)  critical angle 
A)  refractive index 
B)  reflective index 
C)  wavelength of light 
D)  critical angle

Question 15

The attenuation of an optical signal is due to:

Accepted Answer

A)  scattering 
B)  absorption 
C)  macro bending 
D)  none of the above 
E)  all of the above 
A)  scattering 
B)  absorption 
C)  macro bending 
D)  none of the above 
E)  all of the above

Question 16

Which is not a major criteria in selecting a specific type of fiber optic cable?

Accepted Answer

A)  refractive index 
B)  signal losses 
C)  ease of light coupling and interconnection 
D)  bandwidth 
A)  refractive index 
B)  signal losses 
C)  ease of light coupling and interconnection 
D)  bandwidth

Question 17

The protocol standard for optical transmission in long-haul communication is:

Accepted Answer

A)  STS 
B)  SONET 
C)  OC 
D)  FDDI 
A)  STS 
B)  SONET 
C)  OC 
D)  FDDI

Question 18

The wave length at which the material and waveguide dispersion cancel one another is called:

Accepted Answer

A)  critical wave length 
B)  mode-field diameter 
C)  zero-dispersion wavelength 
D)  none of the above 
A)  critical wave length 
B)  mode-field diameter 
C)  zero-dispersion wavelength 
D)  none of the above

Question 19

A term used to describe the transmission of data over hundreds or thousands of miles.

Accepted Answer

A)  long haul 
B)  short haul 
C)  haul 
D)  medium haul 
A)  long haul 
B)  short haul 
C)  haul 
D)  medium haul

Question 20

Determine the maximum fiber length if the maximum bit rate is 56 Kbps and the dispersion is 6 ns/km.

Accepted Answer

A)  200 Km 
B)  0.000595 Km 
C)  595 Km 
D)  10 Km 
A)  200 Km 
B)  0.000595 Km 
C)  595 Km 
D)  10 Km

A jelly like substance that has an index of refraction much closer to the glass than air is called:

Common synonymous terms for a fiber optic strand are: (select all that are correct)

A dispersion compensating fiber

The numerical aperture of a fiber:

Which of the following is an important characteristic of light detectors?

Pulse dispersion is mainly caused by:

A coherent light source is one that is:

The trapping of light in a fiber results from:

The term for incorporating the propagation of several wavelengths in the 1550nm range of a single fiber is called

A piece of test equipment that sends a light pulse down the fiber and measures the reflected light is called:

An estimation of how long a fiber optic cable can be for a given bit rate and dispersion for successful data communications to occur is referred to as:

Which of the following are typical wavelengths used in fiber optics?

Fiber cables with core diameters of about 7 to 10 m.

The amount of bending of the light into a material depends on the of that material:

The attenuation of an optical signal is due to:

Which is not a major criteria in selecting a specific type of fiber optic cable?

The protocol standard for optical transmission in long-haul communication is:

The wave length at which the material and waveguide dispersion cancel one another is called:

A term used to describe the transmission of data over hundreds or thousands of miles.

Determine the maximum fiber length if the maximum bit rate is 56 Kbps and the dispersion is 6 ns/km.

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Filters

Exam 18: Fiber Optics

A jelly like substance that has an index of refraction much closer to the glass than air is called:

Common synonymous terms for a fiber optic strand are: (select all that are correct)

A dispersion compensating fiber

The numerical aperture of a fiber:

Which of the following is an important characteristic of light detectors?

Pulse dispersion is mainly caused by:

A coherent light source is one that is:

The trapping of light in a fiber results from:

The term for incorporating the propagation of several wavelengths in the 1550nm range of a single fiber is called

A piece of test equipment that sends a light pulse down the fiber and measures the reflected light is called:

An estimation of how long a fiber optic cable can be for a given bit rate and dispersion for successful data communications to occur is referred to as:

Which of the following are typical wavelengths used in fiber optics?

Fiber cables with core diameters of about 7 to 10 m.

The amount of bending of the light into a material depends on the of that material:

The attenuation of an optical signal is due to:

Which is not a major criteria in selecting a specific type of fiber optic cable?

The protocol standard for optical transmission in long-haul communication is:

The wave length at which the material and waveguide dispersion cancel one another is called:

A term used to describe the transmission of data over hundreds or thousands of miles.

Determine the maximum fiber length if the maximum bit rate is 56 Kbps and the dispersion is 6 ns/km.

Introductory Topics

Amplitude Modulation: Transmission

Amplitude Modulation: Reception

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Filters