Which of the following refers to the relative refractive index difference of single mode fibers?
0.1 - 0.3 %
ECE Board Exam November 2000
A parameter of light beam that do not change the quality when it enters one medium from another.
Frequency
ECE Board Exam April 2000
Which of the following limits the top speed of transmitting information in fiber optic communication?
Detector speed
ECE Board Exam November 1999
Type of multi-channel signal transmission in the optic fiber communication that uses twisted pair coupler to transmit two signals of different wavelengths.
Frequency-division multiplexing
ECE Board Exam April 1999
Best applies to an optical fiber core.
A higher refractive index than the cladding
ECE Board Exam November 1998
How many times bigger does the bandwidth of a fiber optic multimode have over cable?
100 times bigger
ECE Board Exam April 1998
What law does a light travelling in an optical fiber follow?
Snell's
ECE Board Exam November 1997
Band of light waves, that are too short to be seen by human eye.
Ultraviolet
ECE Board Exam April 1997
Insertion loss of connector-type splices for a single-mode fiber cable.
0.38dB
ECE Board Exam November 1996
An object father from a converging lens than its focal point always has an ________ image.
inverted
ECE Board Exam March 1996
The dielectric material of an optical fiber surrounding the core.
Cladding
ECE Board Exam April 2001
An optical time domain reflectometer used in fiber optic communication is not intended to determine one of the following:
Kind of multiplexing
--------------------- An optical time domain reflectometer used in fiber optic communication-------
Refractive index
Loss per kilometer
Length of fiber
ECE Board Exam November 2000
In wire communications system using fiber optic, the packing fraction is related to one of the following statements when referred to fiber optic bundle.
Ratio of the total cross-sectional area to the total cross-sectional area of the fiber bundle
ECE Board Exam April 2000
Why are fiber optic cables considered less expensive compared to coaxial cables in communication system?
Use of less repeaters
ECE Board Exam November 1999
An optic fiber regenerator which is used in communication is consisting of a ________ to clean up and amplify digital data moving in one direction and a similar system for the opposite direction.
transmitter and receiver
ECE Board Exam April 1999
How do you account the effect of light intensity on the refractive index of a fiber optic?
Increases
ECE Board Exam November 1998
One of the following referred to as a major component of an optical time domain reflectometer.
Pulse generator laser
ECE Board Exam April 1998
__________ generates light beam at a specific visible frequency.
Laser
ECE Board Exam November 1997
The most common device used as a light detector in fiber optic communication system.
APDs
ECE Board Exam April 1997
A non-coherent light source for optical communications system.
LED
ECE Board Exam November 1996
The loss in signal power as light travels down a fiber is
attenuation
ECE Board Exam March 1996
It is made from semiconductor material such as aluminum-gallium-arsenide or gallium-arsenide-phosphide.
Light emitting diode
ECE Board Exam April 2001
How much bigger does the bandwidth of a single mode fiber optic have over the multimode fiber?
20 times bigger
ECE Board Exam November 2000
Which of the following refers to the bandwidth of optical fiber?
1 MHz - 500 MHz
ECE Board Exam April 2000
Refers to a characteristic of a multimode fiber optic.
Cladding thickness is greater than the radius of the core and the diameter of the core must be much greater than the wavelength of the light to be carried.
ECE Board Exam November 1999
What do you call the loss in signal power as the light travels the fiber optic?
Attenuation
ECE Board Exam April 1999
One of the characteristics of a fiber optic used in order to carry light in several modes of propagation or to become a multimode fiber.
Diameter of the core must be very muuch greater than the wavelength of the light to be carried.
ECE Board Exam November 1998
What kind of effect is referred to a varying light producing a varying voltage output of a detector?
Photovoltaic effect
ECE Board Exam April 1998
Quantity that do not change when a beam of lifgt enters one medium to another
Frequency
ECE Board Exam April 1997
Type of fiber that has the highest modal dispersion.
Step-index multimode
ECE Board Exam November 1997
Calculate the energy of the photon of infrared light intensity at 1.55 um.
ECE Board Exam November 1996
The different angles of entry of light into an optical fiber when the diameter of the core is many times the wavelength of the light transmitted is known as __________.
mode
ECE Board Exam March 1996
An absorption loss caused by valence electrons in the siica material from which fibers are manufactured.
Ultraviolet absorption
ECE Board Exam April 2001
Which of the following is not a major component of an optical time domain reflectometer used in fiber optic communication?
vertical and horizontal plates
-------------------- major component of an optical time domain reflectometer used in fiber optic communication---------------------
Laser
Beam splitter
Pulse generator
ECE Board Exam November 2000
Which of the following is a part of an optical time domain reflectometer?
Beam splitter
ECE Board Exam April 2000
This refers to a certain material which is most sensitive to light.
Photoresist
ECE Board Exam November 1999
Referred to as a light source of fiber optic which supplies level of 5
to 7 milliwats and having a narrow spectrum of emission.
Injection laser diode
ECE Board Exam April 1999
Most likely, how many times would a fiber optic break in a span of thirty years?
2 - 3 times
ECE Board Exam November 1998
An advantage of optic fiber rejecting an induced noise signal from magnetic field or solar storm flux
Immunity to noise
ECE Board Exam April 1998
Which of the following colors of light rays has the shortest wavelength?
Violet
ECE Board Exam April 1997
Fiber optic cable operates near ________ frequencies.
800 THz
ECE Board Exam November 1997
If a fiber optic system has a rise time of 38.55 ns, the source rise time is 12 ns and the detector rise time is 12 ns, what is the cable rise time?
ECE. Board Exam November 1996
Proposed the used of a clad glass fiber as a dielectric waveguide
Bockham and Kao
ECE Board Exam November 2000
ln electronic communications where fiber optic material is used, a reflected
wave is a possibility. what happen to the polarization of this reflected wave
when compared to its original form?
Shifts to 180 degrees
ECE Board Exam April 2000
The effect of multimode propagation caused the rays leaving the fiber to
interfere constructively and destructively as they leave the end of the fiber
this effect is called _________.
modal delay spreading
ECE Board Exam November 1999
What is the wavelength for deep violet light?
500 nmeter
ECE Board Exam April 1999
A device in the fiber optic that is used to attenuate the reflected signal from the polished end of the fiber which has a possibility of developing into a noise.
Isolator
ECE Board Exam November 1998
One of the advantages of the fiber optic which is referred to the volume of capacity of signals it can carry
Bandwidth
ECE Board Exam April 1998
Circuit used to amplify the optical signal in fiber optics communications links.
Optical repeater
ECE Board Exam November 1997
A device that reduces the intensity of light in fiber optics communication systems
Optical attenuator
ECE Board Exam April 1997
Lifetime of ILDs
50.000 h
ECE Board Exam November 1996
What is the stage of the sand becoming a silicon?
Molten
ECE Board Exam November 2000
One of the major limitations of a plastic fiberoptic used in communication
Due to its high losses
ECE Board Exam April 2000
One of following is considered the largest source of signal power loss in the
use of fiber optic as communications medium such as due to misalignment.
ConnectionECE Board Exam NOvember 1999
One of the following is related to the application of solid material as a medium where light travels.
medium where Ilght travels. apphcatlon of 5DHd mater-ja}; as 3
Fiber optics
ECE Board Exam April 1999
Which of the following is not considered as one of the causes for the loss of signal power as light travels through a fiber optic?
Inter-modulation
----------------causes for the loss of signal power as light travels through a fiber optic-----------------
Scattering
Fiber bending
Absorption
ECE Board Exam November 1997
The core of the optical fiber has _______
a higher index of refraction than the cladding
ECE Board Exam November 1997
Loss due to the diffraction of light when it strikes on the irregularities formed
during the manufacturing process of the fiber optics.
Rayleigh scattering loss
ECE Board Exam November 1996
If a fiber optic system has a rise time of 16 ns, the source rise time is 1.5 ns and the detector rise time is 2 ns, what is the cable rise time?
ECE Board Exam November 2000
A phenomenon which causes the speed of light rays propagation in the fiber
material changes, as it passes through different medium in the fiber
Refraction
ECE Board Exam April 2000
At what intenial does a fiber optic needs a repeater in communications
system?
30 to 300 miles
ECE Board Eanm November 1999
Referfeq to as a limit in reducing further the loss of signal passing through a
fiber optic caused by scattering.
Rayleigh effect
ECE Board Exam April 1999
These are band of light wavelengths, that are too short to be seen by the human eye.
Ultraviolet
ECE Board Exam November 1998
A quarter wavelength device made of crystalline calcite that changes polarization in the optic fiber communication
Retarder
ECE Board Exam April 1999
At what power levels does fiber optic have when used in electronic communications?
Range of micro to milliwatts
ECE Board Exam November 1998
One of the following is among the types of fiber optics used in electronics communication.
Semi-graded multimode
ECE Board Exam November 1998
How do you reduce the loss that is produced when light strikes a flat polished end of a fiber optic?
By application of antireflection coating
ECE Board Exam November 1998
What is the device use in used in fiber optic communication which consist of a receiver transmitter use tc clean up and amplify digital data moving in one direction and another in opposite direction?
Optic regenerator
ECE Board Exam November 2000
An advantage of fiber optic over co-axial cable as a result of coupling signals
from one to the other due to changing magnetic field in one or both.
Crosstalk
ECE Board Exam April 2001
What is the index of refraction of a certain substance if light travels through
the substance at 100 meters at a time is to 140 meters to air'?
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