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Fiber Optics > SLC - Fiber Optics Exam Study > Flashcards

SLC - Fiber Optics Exam Study Flashcards

1
Q

What material is best used for a ferrule?

A

Ceramic

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2
Q

What are 3 traits of a fiber optic connector?

A

Low cost
Easy installation
Low loss
Repeatability

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3
Q

What class is a eye safe laser?

A

Class 1

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4
Q

What is a VFL?

A

Visual Fault Locator

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5
Q

What class does a VFL fall under?

A

Class 3A

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6
Q

How do you properly dispose of optical fiber?

A

Through a clearly marked container labeled Fiber Optical Disposal

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7
Q

What must be available when working with chemicals?

A

Material Safety Data Sheets (MSDS)

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8
Q

When cleaving, at what position do you want your blade at?

A

Perpendicular

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9
Q

Pure quartz silica glass melts at how many degrees Celsius?

A

2000 Degrees Celsius

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10
Q

Diodes of the fusion splicer heat the glass to how many degrees Celsius?

A

1,200 Degrees Celsius

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11
Q

What is the maximum loss allowed using a fusion splicer?

A

.3 db loss

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12
Q

What are some common causes of a fixed v-groove offset?

A

Dirt
Debris on fiber
Different fiber optic diameter

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13
Q

At what arc count does a diode need to be replaced on a fusion splicer?

A

Over 1000 count

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14
Q

The splicing environment must be ________ as possible?

A

Clean

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15
Q

What must be done before daily splicing operations may be conducted?

A

Must perform an arc test on the fusion splicer device

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16
Q

Where is the most common location for a fusion splice to fail?

A

The direct splice location

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17
Q

What year did AT&T and GTE install the first commercial phone system?

A

1977

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18
Q

What are the advantages of optical fiber?

A 
Info Carrying capacity 
Low loss 
Electro immunity 
Light weight 
Small form factor 
Security 
Upgradable
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19
Q

How much is a micrometer?

A

Millionth Um

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20
Q

How much is a nanometer?

A

Billionth nm

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21
Q

What are the primary parts of a fiber optic cable?

A

Transmitter
Receiver
Connector
Cable

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22
Q

What is a mode?

A

The path of a ray of light through glass

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23
Q

What does LED stand for?

A

Light emitting diode

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24
Q

What is reflection?

A

Light that bounces off an interface

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25
Q

What is refraction?

A

Light rays that bend while changing speed

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26
Q

What is the critical angle?

A

Smallest angle at which total internal reflection occurs

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27
Q

How many microns is a cladding core?

A

125 microns

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28
Q

How many microns is a buffer?

A

900 microns

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29
Q

What is the numerical aperture?

A

The light gathering ability of fiber

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30
Q

Multi mode cable has what color of jacket?

A

Orange

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31
Q

OM1 & OM2 are considered what?

A

Legacy- multi mode

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32
Q

Fiber optics operate at what mode of the spectrum?

A

Infrared

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33
Q

What are the two most common dimensions of a multi mode cable?

A

850 nm

1300 nm

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34
Q

What are the most common dimensions of single mode fiber?

A

1310 nm

1550 nm

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35
Q

What color is the jacket of single mode fiber?

A

Yellow

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36
Q

OS1 & OS2 are what?

A

Laser diode light source

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37
Q

What are the dimensions of a multi mode fiber core?

A

62.5 / 50 microns

38
Q

What is the dimensions of a single mode fiber core?

A

8 - 10 microns

39
Q

What light source does OM3 & OM4 use?

A

VCSEL (LED) transmitting light source

40
Q

What color of jacket is a OM3 & OM4?

A

Aqua

41
Q

What is the maximum bend radius for a fiber optic cable?

A

20x the outside diameter of the cable

42
Q

What is outdoor fiber made of?

A

Loose tube cable

43
Q

What does the NEC stand for?

A

National Electrical Code

44
Q

How many years is the NEC updated?

A

Every 3 years

45
Q

How much light travels through the core?

A

80%

46
Q

How much light travels through the cladding?

A

20%

47
Q

What 3 materials do loose tube contain?

A

Gel
Tape
Powder

48
Q

The gel, tape, and powder in loose tube prevent what?

A

Water

49
Q

What is Article 777?

A

The listing and marking of fiber optic cable

50
Q

What is plenum rated cable?

A

Fire retardant and low smoke rated cable

51
Q

What is conducive cable mean?

A

Contains conductive strength or other conductive material

52
Q

What is non-conductive cable mean?

A

Contains no metallic strength members and no other electric conductive material

53
Q

What is a composite hybrid cable?

A

Carries a optical fiber and current carrying conductors

54
Q

What is wave guide dispersion?

A

Light that travels in both the core and cladding

55
Q

What is material dispersion?

A

Light traveling at different wave lengths and at different speeds

56
Q

What is model dispersion?

A

Light following different paths through the fiber and arriving at the far end at different times

57
Q

What are the first 6 colors of a fiber optics coloring code?

A 
Blue 
Orange 
Green 
Brown 
Slate 
White
58
Q

What are the last 6 colors of a fiber optics coloring code?

A 
Red
Black 
Yellow 
Violet
Rose 
Aqua
59
Q

Resolution is described as a __________?

A

Distance

60
Q

How fast is the speed of light in a vacuum?

A

186,000

61
Q

What are the two types of resolutions?

A

Data sampling and spatial resolution

62
Q

What does tight buffer breakout have a layer of?

A

Layer of Kevlar on each strand

63
Q

What is an example of distribution?

A

Tight buffer

64
Q

What is the formula for the index of a refraction?

A

N= velocity of light in a vacuum/ velocity of light in a medium

65
Q

What does a fusion profile alignment system offer?

A

High resolution CCD camera

66
Q

A 3 decimal loss is how much loss in power?

A

50.1%

67
Q

1 milliwatt mW = _______ decimal per meter

A

0 dBm

68
Q

What is the number one problem in maintaining an optical network?

A

Contamination

69
Q

All connectors must be _______ prior to testing

A

Cleaned

70
Q

TIA 568-c test method _________ requires one measured quality jumper

A

B

71
Q

What is the cable loss for 850 nm wavelength’s?

A

3.5dB

72
Q

What is the cable loss for 1300 nm wavelength?

A

1.5dB

73
Q

What is the typical output power of an LED?

A

-15 dBm to -20 dBM

74
Q

0dBm is equal to?

A

1 mW

75
Q

What does OTDR stand for?

A

Optical time domain reflectometer

76
Q

What is backscatter?

A

Scattering occurs as a result of a light hitting the density changes in the glass

77
Q

What does OTDR measure?

A

Level of backscatter

78
Q

What is Fresnel reflection?

A

Occurs in the index of refraction, fiber breaks, splice points. Light reflected back toward the source

79
Q

What are the two types events?

A

Reflective and non-reflective

80
Q

What is some reflective type of events?

A

Connectors, mechanical splices and breaks are typically reflective events

81
Q

What are some non-reflective type of events?

A

Fusion spices and excessive bends in the cable

82
Q

What determines a dead zone?

A

Pulse width determines the length of the dead zone

83
Q

What is an event dead zone?

A

Area of two points that is 1.5 DB down from top of a reflection

84
Q

What is an attenuation dead zone?

A

Area of beginning of a pulse point .5 dB above the backscatter

85
Q

Fusion splices may be displayed as a ______ or ______ due to different backscatter coefficients

A

Loser or Gainer

86
Q

______ ________ is the result of a light impurity in the core glass causing the light to be absorbed

A

Light absorption

87
Q

How is the power controlled in OTDR device?

A

By adjusting the pulse width

88
Q

_______ determines how far out the OTDR will display the fiber trace

A

Range

89
Q

What must be present at the end of the trace to ensure an adequate range?

A

Noise

90
Q

_______ wavelengths are more succesable to Bending losses than shorter wavelengths

A

Longer wave lengths

91
Q

What color is the connector on a single mode fiber optic cable?

A

Blue

Fiber Optics (1 decks)

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