Deck 16: Fiber Optics

Question 1

Which of the following is a major criteria that affects the choice of fiber type?
A.Ease of interconnection
B.Size of light wavelength
C.Signal strength
D.Beamwidth

Answer 1

Ease of interconnection

Question 2

What type of a system typically has high channel density and high bit rate,is highly reliable,incorporates redundant equipment,and involves extensive engineering studies?
A.LANs
B.Long-haul
C.MANs
D.WANs

Answer 2

Long-haul

Question 3

What type of network is currently the standard for the long-haul optical transport of telecommunications data?
A.Synchronous transport
B.Conventional
C.Coaxial cable
D.Synchronous optical

Answer 3

Synchronous optical

Question 4

Visible light striking a prism causes refraction at both air/glass interfaces and separates the light into its various frequencies,which appear as__________.
A.fibers
B.beamwidths
C.colors
D.pulses

Question 5

What is optical fiber made of?
A.Ultrapure glass
B.Plastic
C.Copper
D.Polymers

Question 6

___________ is the loss of power introduced by the fiber.
A.Polarization
B.Fusion splicing
C.Cladding
D.Attenuation

Question 7

Which of the following defines the broadening of a pulse due to different propagation velocities of the spectral components of the light pulse?
A.Polarization mode dispersion
B.Modal dispersion
C.Microbending
D.Chromatic dispersion

Question 8

What is the purpose of an isolator?
A.Allows optical power to flow in one direction only
B.Reduces the received signal level
C.Used in simplex systems where a single optical signal is divided and sent to several receivers
D.Combines or divides two or more optical signals

Question 9

The eye can't see fiber-optic communications wavelengths,so there is no pain or awareness of exposure,but what part of the eye can still be exposed and damaged?
A.Iris
B.Retina
C.Lens
D.Cornea

Question 10

Which of the following is an important characteristic of light detectors?
A.Allows repeated matings and unmatings
B.Less-complex driving circuitry
C.Optical stabilization
D.Spectral response

Question 11

Light is emitted from an LED as a result of the recombining of electrons and __________.
A.optic fibers
B.holes
C.decibels
D.nanometers

Question 12

__________ is a long-term method in which two fibers are fused or welded together.
A.Mechanical splicing
B.Index matching
C.Fusion splicing
D.Connectorization

Question 13

Where does modal dispersion predominantly occur?
A.Multimode fiber
B.Single-mode fiber
C.Diode lasers
D.LEDs

Question 14

What was developed in an effort to overcome pulse dispersion?
A.Step-index fibers
B.Commercial grade fibers
C.Graded-index fibers
D.Single-mode fibers

Question 15

Fiber optics has the capacity to carry more ___________.
A.multimode fibers
B.bandwidth
C.transmitter power
D.photodiodes

Question 16

The environment for interior installations is usually well controlled. Which of the following is an exposure factor for interior installations?
A.Vibrations
B.Rodents
C.Chemicals
D.Water

Question 17

Which of the following is a composite of light interaction with the atomic structure of the glass and involves the conversion of optical power to heat?
A.Scattering
B.Macrobending
C.Absorption
D.Microbending

Question 18

In which of the following would you find plastic fibers?
A.Long-haul telecommunications
B.Robotics
C.Data networks
D.Military applications

Question 19

The ____________ specifies the maximum losses that can be tolerated in the fiber system.
A.power budget
B.bit error rate
C.spectral width test
D.optical power meter

Question 20

What are the electromagnetic light waves just below the frequencies in the visible spectrum called?
A.Fiber optic
B.Optical
C.Ultraviolet
D.Infrared

Question 21

___________ causes a light wave to be bent.
A.Electromagnetic coupling
B.Reflection
C.Refraction
D.Radiation

Question 22

Since glass is basically inert,what effects of certain environments are not a problem with optical communications?
A.Shrinkage
B.Corrosion
C.Warping
D.Expansion

Question 23

Which of the following advantages of optical communications is represented when the light in one glass fiber does not interfere with,nor is it susceptible to,the light in an adjacent fiber?
A.Elimination of crosstalk
B.Lower costs
C.Immunity to electrostatic interference
D.Lower signal attenuation

Question 24

What portion of the fiber strand carries the transmitted light?
A.Cladding
B.Core
C.Protective jacket
D.Couplings

Question 25

Why is plastic fiber only used in short lengths in industrial applications?
A.Signal losses
B.Abrupt changes in the refractive index
C.High attenuation
D.Variable path lengths