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Flashcards in fiber Deck (99):
1

EDFA

Erbium-Doped Fiber Amplifier

2

Similar to loose tube, this type of cable has ribbons that are contained in buffer tubes

Ribbon Stranded

3

A card made up of material similar to photographic film that changes colors when exposed to light

Photosensitive Card

4

The wavelength range of visible light

390nm to 780nm

5

OCEF 

Optical Cable Entry Facility 

6

What is the formula to convert dB to mW?

mW = 10(dB/10)

7

The two means of splicing fiber optic cable

Fusion SplicingMechanical Splicing

8

APC

Angle Polish Connector

9

Monitoring Center for high-speed data and telephony.  Technical customer service calls are escalated here for investigation and network troubleshooting 

Network Operation Center (NOC) 

10

Generated during the node certification showing the fiber performance when first activated.  It is a document used to compare old test results to new test results 

Node Birth Certificate. 

11

The diameter of the glass cladding

125 microns

12

A device that scores then breaks the optical fiber to prepare it for splicing

Cleaver

13

Radiated light created in the same direction at the same time 

Coherent Light 

14

Where the connector end of the pigtail is connected to the laser.  Provides a neat and orderly method of managing the patch cords. 

Patch Panel 

15

The two ways a fusion splicer lines up the fiber ends in order to get the best possible splice.

Local Injection and Detection (LID)Profile Alignment

16

SC

Standard Connector

17

Silicon photodiodes are sensitive to light in the range of 

400 to 1000nm 

18

What is Comcast's maximum allowed loss through a fusion splice?

0.5dB

19

The ideal optical power level at a receiver input is

0dBm

20

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

Refractive Index

21

UPC

Ultra Polish Connector

22

Most light generated by lasers for telecommunications exist in this light band

Infrared band

23

Theoretically, how many wavelengths can be carried on a single fiber using DWDM?

2 to 128

24

A device used to test for dicontinuities (impedance mismatches) on coaxial cables 

Time Domain Reflectometer (TDR) 

25

Used to detect light from an optical fiber and convert the light to an electrical source

Photodiode

26

A jumper cable for optical connectors

Pigtail

27

This laser generates only one wavelength at it's output 

Distributive Feedback Laser (DFB) 

28

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

Refractive Index 

29

Enables different wavelengths to be carried on a single optical fiber

WDM (Wave Division Multiplexing)

30

List the 5 laser classes

Class 1Class 2/2AClass 3AClass 3BClass 4

31

Typical loss (in dB) of a fiber connector

0.5dB

32

A device used to wrap and store excess fiber optic cable in an aerial location

Snowshoe

33

Two types of fiber amplifiers

EDFA (Erbium-Doped Fiber Amplifier)YEDFA (Ytterbium Erbium-Doped Fiber Amplifier)

34

Formula to convert mW to dBm

dBm = 10log(mW)

35

An electronic or optical process that combines several individual signals or wavelengths into a single carrier or path.

Multiplexing

36

Type of cable consisting of larger buffer tubes with the fibers inside, surrounded by fiberglass water block tape, armor, two steel strength members and a jacket

Unitube

37

a trillion Hertz or 1,000 gighertz

Terahertz

38

Similar to loose tube, this type of cable consists of buffer tubes surrounded by a fiberglass wrap and two steel strength members on each side molded into the jacket.

Flex Tube

39

The most basic laser and consists of two pieces of semiconductor material with an active layer between them 

Fabry-Perot Laser 

40

Central data point communicating with endpoints of a network.  All data communications must flow through the central point. 

Star

41

Test equipment used to visually see the losses, breaks and distance measurements in an optical fiber

OTDR (Optical Time Domain Reflectometer)

42

Fiber loss is expressed in this manner

dB/km (decibels per kilometer)

43

A network of devices connected together in a circular communication link

Ring 

44

A board for making optical connections consisting of sleeves used to line up two connectors

Patch Panel

45

Used to measure transmitter outputs and receiver inputs

Optical Power Meter

46

Allows multiple wavelengths above and below a center wavelength to be carried on a single optical fiber

DWDM (Dense Wave Division Multiplexing)

47

Output of a YEDFA 

22dBm 

48

How far back should the fibers be stripped?

1-1/2 to 2 inches

49

Typical loss (in dB) of a mechanical splice

0.25dB

50

Allows only a single mode of light to propagate through the fiber core

Single Mode Fiber

51

Light that is reflected back to the source and contributes to the optical fiber loss 

Backscattered Light 

52

A special optical fiber connector used in gigabit Ethernet Devices that uses fibers in pairs with LC and/or SC.

LCSC

53

The three types of optical power meters 

Silicon (Si)Germanium (GE)Indium-Gallium-Arsenide (InGaAs) 

54

A connection point in a cable system where a fiber enters a neighborhood and the optical signal is converted to an electrical signal

Node

55

How many feet is equal to 1km

3300 ft

56

Is a water-resistant enclosure that is intended for storing trays of optical fiber splices between incoming outside plant fiber cables and the inside fiber cables going to the fiber patch panels. 

OCEF (Optical Cable Entry Facility) 

57

This cable configuration is the same as unitube, except fibers are arranged side by side

Ribbon

58

FC

Ferruled Connector

59

Attenuation of the wavelength 1310nm per kilometer

.35 dB/km

60

Method of joining two optical fibers of the same type using an electrical arc to form a precision splice

Fusion Splice

61

YEDFA

Ytterbium Erbium-Doped Fiber Amplifier

62

The twelve fiber and buffer tube colors in order:


* Blue
* Orange
* Green
* Brown
* Slate
* White
* Red
* Black
* Yellow
* Violet
* Rose
* Aqua

63

The three most important procedures to insure a good splice

Proper CleaningProper CleaveControlled Break

64

This is the sum of all the losses associated with a fiber link between the optical fiber transmitter and the optical fiber receiver

Loss Budget

65

5 types of fiber connections

FC (Ferruled Connector)SC (Standard Connector)UPC (Ultra Polish Connector)APC (Angle Polish Connector)LCSC

66

Output gain of an EDFA 

Over 40dB Possible 

67

Used to visually see the losses, breaks and distance measurements in an optical fiber link 

OTDR (Optical Time Domain Reflectometer) 

68

One billion cycles per second or 1 billion Hertz

Gigahertz

69

In DWDM, the wavelengths are this far apart

0.8nm or 100GHz

70

Attenuation of the wavelength 1550nm per kilometer

.25 dB/km

71

Color-Coded tubes that house and protect the optical fibers within a fiber optic cable.

Buffer Tubes

72

A method used to lock and mark one end of a line in order to allow someone to safely work on the other end

Lockout Tag-out

73

Typical loss (in dB) of a fusion splice

0.1dB

74

The distance that cannot be seen by the OTDR because the initial pulse doesn't create enough backscattered light and "hides" the first several hundred feet of cable. 

Dead Zone 

75

The preferred method of fiber optic splicing

Fusion Splicing

76

This type of fiber optic cable consists of a single strength member in the center surrounded by color-coded buffer tubers, which contain fibers that are also color-coded.

Loose Tube

77

A temporary joining of two optical fibers of the same type using a plastic form to hold and lock fibers together.

Mechanical Splice

78

The gel from buffer tubes should be cleaned with what?

Isopropyl Alcohol that is at least 90% pure

79

To prevent stress on the fiber, cable manufacturers put about 1% more fiber in the cable than the length of the cable itself, to allow for some stretch.  What is this called? 

Lay Loss Factor 

80

Used to locate faults in jumpers and pigtails

Visible fault locator

81

A Photodiode used to detect light from an optical fiber and converts the light to an electrical source

PIN Diode 

82

When was the Optical Fiber laser invented 

in 1958 at Bell Labs 

83

RIN 

Relative intensity Noise 

84

The interface between the Headend (Hub) and the RF Plant.

Node

85

Optical fiber with erbium, a rare earth material, added to the glass during the manufacturing process, to give fiber useful properties when properly lased 

Doping 

86

Attaches optical fiber from the device to an optical connector 

Pigtail 

87

The difference between transmitted and received power resulting from the loss through equipment, lines, or other transmission devices; usually expressed in decibels

Attenuation

88

The diameter of the fiber optic coating

250 microns

89

Allows many modes of light to propagate through the core.

Multi-Mode Fiber

90

Name the 5 most common fiber optic cable arrangements

Loose TubeFlex TubeUnitubeRibbonRibbon Stranded

91

A cabinet or rack that houses the splices of the outside plant fiber to the inside headend, node or OTN fiber. 

Splice Panel 

92

The diameter range of the fiber optic core

8 to 10 micron

93

Extra fiber connected to the OTDR to make up for the dead zone. 

Launch Cable 

94

What does LASER stand for?

Light Amplification by the Stimulated Emission of Radiation

95

Optical splitter loss is based on _________

Percentages

96

Fiber amplifier that provides the greatest output gain

YEDFA (Ytterbium Erbium-Doped Fiber Amplifier)

97

Advantage of InGaAs over Ge detectors. 

InGaAs are less noisy and allow measurements down to -65dBm. 

98

Fibers are contained in a plastic tube much larger than the optical fibers.  The fibers can move freely within the tube.

Loose Tube

99

A photo diode used to detect light from an optical fiber and convert the light to an electrical source

PIN Diode