Question 1

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

Accepted Answer

A)   glass
B)   light pipe
C)   fiber
D)   conduitE) None of the above
F) A) and C) A, B, C

Question 2

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 KmE) None of the above
F) A) and B)

Question 3

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 aboveF) B) and D)
G) A) and B)

Question 4

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 aboveE) B) and C)
F) All of the above

Question 5

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

Accepted Answer

A)   multi mode
B)   mode field
C)   single mode
D)   step-indexE) B) and D)
F) B) and C)

Question 6

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)   bandwidthE) A) and B)
F) None of the above

Question 7

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 aboveF) A) and E)
G) A) and B)

Question 8

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 aboveE) All of the above
F) C) and D)

Question 9

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 haulE) A) and B)
F) A) and C)

Question 10

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 gelE) A) and C)
F) None of the above A

Question 11

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 aboveE) A) and B)
F) A) and C)

Question 12

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 aboveE) A) and B)
F) A) and C) D

Question 13

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.E) A) and D)
F) A) and C)

Question 14

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 pulserE) None of the above
F) C) and D)

Question 15

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 angleE) A) and C)
F) A) and D)

Question 16

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.E) A) and C)
F) A) and B)

Question 17

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 understandE) All of the above
F) A) and D)

Question 18

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

Accepted Answer

A)   STS
B)   SONET
C)   OC
D)   FDDIE) C) and D)
F) All of the above

Question 19

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 feedbackE) A) and B)
F) A) and D)

Question 20

The trapping of light in a fiber results from:

Accepted Answer

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

Exam 18: Fiber Optics

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

Correct AnswerverifiedA, B, C

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The attenuation of an optical signal is due to:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

The numerical aperture of a fiber:

Correct AnswerverifiedShow Answer

A dispersion compensating fiber

Correct AnswerverifiedD

Pulse dispersion is mainly caused by:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

A coherent light source is one that is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The trapping of light in a fiber results from:

Correct AnswerverifiedShow Answer

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A, B, C

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D

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