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Dan2024 Study > Fiber-Workday CommTech 5 Module 2 Fiber optics-Quizlet > Flashcards

Fiber-Workday CommTech 5 Module 2 Fiber optics-Quizlet Flashcards

1
Q

What two chemicals are used to protect as well as to clean
the optical fibers

A

isopropyl alcohol, acetone degreasers

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2
Q

AN optical fiber has a diamtere of

A

125 microns

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3
Q

Most light generated by lasers for telecommunications use exists in between these
wavelengths

A

1310 -1550 nm

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4
Q

The wavelenghts above this color are not visible to the
human eye

A

Red

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5
Q

The wavelengths above this wavelength is not visible to
the human eye

A

650 nm

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6
Q

an unterminated fiber can be tested for the presence of
light by using this

A

Photosentive card

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7
Q

This laser classification is safe as long as they are not
dissembles

A

Class 1

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8
Q

This laser classification is an eye hazard if collected or
focused on the eye

A

Class 3a

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9
Q

This laser classification is an
eye hazard if beam is viewed

A

Class 2

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10
Q

Ths laser classification is an eye hazard if the direct or
relected beam is viewed

A

Class 3b

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11
Q

This laser classification is an
eye and skin hazard

A

Class 4

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12
Q

you should contact an eye doctor if you have directly viewed a laser within, this
many inches

A

6 inches

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13
Q

Setting up a proper work area will have these 3
characeristics

A

flat surface, dark color, chemical resistant

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14
Q

use this control method when working with active fibers

A

Lockout tag-out

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15
Q

light waves are this amount
higher compared to RF waves

A

300000

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16
Q

is one billonth of a meter

A

nanometer

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17
Q

These three rays are considered the highest frequencies

A

Gamma rays, X-Ray, ultraviolet light

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18
Q

visible light is between these
wavelengths

A

390 - 780 nm

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19
Q

What are the two types of
fiber optics

A

Single mode, Multi-mode

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20
Q

Light is generated at the
source called this

A

Transmitter

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21
Q

List the three different parts
of a fiber

A

Core, cladding, coating ( jacket)

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22
Q

light is generated at the
source called this

A

transmitter

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23
Q

The light traveling down the core is detected by a light
detector called

A

PIN diode

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24
Q

This fiber that allows the light to travel in more than one
mode

A

Multi-mode

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25
Q

typical fiber loss for 1310 nm
per km, in dB

A

0.35

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26
Q

typical fiber loss for 1550 nm
per km, in dB

A

0.25

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27
Q

1310 nm links can go up to
how many miles with no splits

A

21 miles

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28
Q

1550 nm links can go up to
this many miles with optical amplifiers

A

75 miles

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29
Q

1 kilometer is equal to how many feet

A

3300 feet

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30
Q

Loss of power between the optical transmitter and the
optical receiver is called

A

loss budget

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31
Q

This is calculated by adding all of the losses in the path together and then subtracting that number from the
transmitted power

A

Path loss

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32
Q

dBm formula

A

10log(mW)

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33
Q

Splice loss is measured by
this tool

A

OTDR

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34
Q

mW formula

A

10(dB/10)

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35
Q

Fiber comes in these two
different tubes

A

loose, buffer

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36
Q

This type of fiber consists of single strength member in the center surronded by color-
coded buffer tubes

A

Loose tube

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37
Q

Buffer tubes are covered with
this material

A

fiberglass yarn (kevlar)

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38
Q

This type of fiber is flex tube consists of buffer tubes suroonded by a fiberglass wrap and two steel strength
members

A

Flex tube

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39
Q

List the 5 common types of
cabel arrangements in fiber

A

loose tube, flex, unitube, ribbon, ribbon stranded

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40
Q

This involves inserting two pieces of glass into a plastic locking sleeve, carefully aligning the fibers and
locking in place

A

mechanical splicing

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41
Q

is the process by which two pieces of glass are physically melted together

A

fusion

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42
Q

when cleaning fibers what is the minimum percentage of
alcohol used

A

0.9

43
Q

What is the best way to pick up pieces of fiber left in the
cleaver

A

adhesive tape

44
Q

best way to cut a fiber that
will have the lowest possilbe attenuation

A

cleaver

45
Q

machine used to create
optical splice

A

fusion splicer

46
Q

LID

A

Local injection and detection

47
Q

what are the two ways a fusion splicer can line up the
fibers

A

LID, profile alignment

48
Q

this uses a low power laser transmitter and receiver to determine if the fiber ends are properly aligned and if
the splice will have loss

A

LID

49
Q

This type of splice is used in an emergency situation or for
a temporary splice

A

mechanical splicing

50
Q

when striping the fiber it
removes this type of coating

A

acrylic

51
Q

This tool is used to score the
outside of the buffer tubes without damaging the fiber

A

Tubing cutter

52
Q

this tool is used to cut the
kevlar yarn and the glass fibers

A

scissors

53
Q

This tool removes the colored coating from the glass to prepare it for cleaving

A

fiber stripper

54
Q

When splicing how many iches of the colored coating
should be removed

A

3 inches

55
Q

What is the maximum loss of
dB for a fusion splice

A

.05 dB

56
Q

SC

A

Snap Connector

57
Q

This connector offers a good balance between loss and reflections and is the most
commonly used connector

A

SC Snap Connector

58
Q

is a length of cable with a connector terminated at both
ends

A

jumper

59
Q

APC connector provides and angle cut of this degrees, in
range

A

8 to 12 degrees

60
Q

This connector provides a
notch-push and screw on connection

A

FC

61
Q

this connector has a flat cut on the end and any reflections may be directed back to the source. Best
insertion loss

A

UPC

62
Q

provides an angle cut of 8-12 degrees on the end of the
fiber

A

APC

63
Q

this is the newest optical
transport system that uses fiber in pairs

A

LCSC

64
Q

List the two methods of
cleaning fiber

A

Wet, dry

65
Q

L.A.S.E.R.

A

Light amplification by stimulated emissions of radiation

66
Q

increases the bandwidth in optical communications systems by multiplexing different and much closer wavelengths of light over a
fiber

A

DWDM

67
Q

DWDM has a center
frequency of this, in nm

A

1550 nm

68
Q

is considered an interface between the headend and
the RF plant

A

Node

69
Q

this component converts the optical light back to the
original electrical signal

A

optical receiver

70
Q

optical power levels at the
receiver input should be close to this level

A

0 dBm

71
Q

to detect optical light this is
used

A

photodiode

72
Q

at the present time fiber amplifiers work at this range,
in nm

A

1550

73
Q

optical amplifers are made of optical fibers with a special added elements, this process
is called

A

doping

74
Q

1550 optical fiber amplifiers
use these two elements

A

EDFA, YEDFA

75
Q

EDFA

A

erbium-doped fiber amplifier

76
Q

This type of fiber amplifier
can produce gains of 40 dB

A

EDFA

77
Q

This type of fiber amplifiers can produce an output of 22 dBm

A

YEDFA

78
Q

this consist of an optical receiver that converts light back to RF in order to serve the customers in the near
vicinity

A

Node

79
Q

this computes the distace to problems on the fiber such as
attenuation and breaks

A

OTDR

80
Q

light going back toward the
source is called

A

Backscattering

81
Q

This is often referred to as a
gainer

A

Reflection

82
Q

OTDR splices and connectors
are called this

A

events

83
Q

lengths of newly activated fibers measurements are
called

A

fiber optic birth certificate

84
Q

this cable is used to compensate for the dead
zone

A

launch cable

85
Q

this is the distance that can not be seen by the OTDR because its too close to the
source

A

dead zone

86
Q

to prevent stress on the fiber, cable manufactures put this amount more fiber in the cable than the length of the
cable itself

A

0.01

87
Q

to prevent stress on the fiber, manufactures put more fiber than the length of the cable is
called

A

lay loss

88
Q

optical power meters use semiconductors that use the 3 elements

A

Slilcon, Germanium, indium-gallium aresnide

89
Q

silicon photodiodes are sensitive to light in this range,
nm

A

400 - 1000 nm

90
Q

Germanium and indium- arsenide photodioes are sensitive to light in these
wavelengths

A

800- 1600 nm

91
Q

1310 - 1550 uses this element
to detect light

A

InGaAs Indium gallium arsenide

92
Q

this cable has a fiber connector on one side and
bare fiber on the other

A

Pigtail

93
Q

Pigtail normally have this
color jacket

A

yellow

94
Q

OCEF

A

Optical cable entry facility

95
Q

optical fiber laser was
invented in what year

A

1958

96
Q

light that is radiated light in the same direction at the
same time

A

coherent light

97
Q

this laser is low cost laser
transmitters used in the return path of two way networks

A

Fabry-Perot

98
Q

F-P

A

Fabry Perot

99
Q

this laser genrates only one
wavelength at the output

A

DFB

100
Q

DFB has this material that is properly spaced to reflect
only a specific wavelength

A

grating material

101
Q

DFB lasers only operate on
these wavelengths

A

1310, 1550

102
Q

the ratio of the velocity of light of two mediums of optical glass

A

refractive index

103
Q

In the Fiber distribuiton cabinet (FDC) which type of
fiber connector is used

A

SC-APC

104
Q

This contains the splitters,
connectors and fusion splices

A

Fiber Distributed Cabinet (FDC)

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