Outside Plant Fiber Optics
And Study Guide To FOA Certification
Answers To Chapter Questions
Chapter 2 Quiz- OSP Jargon
True/False
Indicate whether the statement is true or false.
1. Optical fibers can transmit either voice, data or video and either analog or digital signals.
ANSWER: T
Virtually any communications signals at any speed can be transmitted over fiber.
2. Singlemode fiber has a smaller core than multimode fiber.
ANSWER: T
Singlemode
fiber has a core size of 8-9 microns compared to 50-62.5 microns of GI
multimode, 240 micron PCS/HCS or 1000 micron POF.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
3. In an optical fiber, the light is transmitted through the __________.
A. Core
B. Cladding
C. Buffer
D. Jacket
ANSWER: A
The
core of the fiber transmits the optical signals, the cladding traps the
fiber in the core and the buffer and jacket protect the fiber.
4. The diameter of an optical fiber is traditionally measured in __________.
A. Meters
B. Millimeters
C. Microns (micrometers)
D. Nanometers
ANSWER: C
Most
glass fibers are 125 microns outside diameter. A micron, one-millionth
of a meter, is the conventional term used for measuring fiber geometry.
5. Rays of light transmitted in multimode fiber are called __________.
A. Reflections
B. Refractions
C. Waves
D. Modes
ANSWER: D
The rays are called modes from the technical term for a electromagnetic field pattern.
6. Loss of a fiber or any fiber in a cable is measured in __________.
A. dB
B. dBm
C. milliwatts
ANSWER: A
dB is a relative power on a log scale, used for measuring loss. dBm refers to power in milliwatts.
7. 10 dB corresponds to a factor of __________ in power.
A. 2
B. 10
C. 20
D. 100
ANSWER: B
10 dB means a factor of 10. 20 dB is a factor of 100, 3 dB is a factor of 2.
8. A fiber stripper removes the __________ of the fiber.
A. Core
B. Cladding
C. Buffer coating
ANSWER: C
When
terminating or splicing fiber, it is necessary to remove the plastic
buffer coating from the glass fiber using a fiber stripper.
9. The __________ protects the fiber from harm.
A. Primary buffer coating
B. Aramid fiber strength members
C. Jacket
D. All of the above
ANSWER: D
All
the components of the cable, the jacket and strength members - in
addition to the primary buffer coating on the glass fiber - are
designed to protect the fiber during installation and from the
environment it will be installed in.
10. Which fiber optic test instrument uses backscattered light for measurements?
A. OLTS
B. OTDR
C. VFL
D. Tracer
ANSWER: B
Rather
than make a direct measurement of loss, the OTDR uses backscattered
light from the fiber to indirectly measure loss of the fiber and
any other events (connectors, splcies or bends).
11. The wavelength of light used for most fiber optic systems is in the __________ region and __________ to the human eye.
A. ultraviolet, invisible
B. solar, visible
C. infrared, invisible
ANSWER: C
Since
fiber has lower loss in the infrared, longer (infrared) wavelengths are
used for most fiber optic communications systems. This light is
invisible to the human eye.
- Next: Lesson 3: Fiber Optic Communications
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