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War Games > Optics > Flashcards

Optics Flashcards

1
Q

Optical wave guide or “light pipe”

A

Optical fiber

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2
Q

An optical source is usually a/an

A

LED or laser

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3
Q

Typical optical detector

A

Photodiode.

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4
Q

Greek letter used to represent wavelength

A

Lambda

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5
Q

Speed of light in a vacuum

A

C, ~300million meters per second
299,792 kilometers per second.
186,282 miles per second

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6
Q

Visible spectrum

A

400Thz-790Thz

750nm-380nm

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7
Q

1Ghz in wavelength

A

300cm

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8
Q

54 MHz in wave length

A

5.6 m

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9
Q

1550 nm in frequency

A

193.5 Thz

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10
Q

1310 nm to frequency

A

229 Thz

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11
Q

1000nm in frequency

A

300 Thz

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12
Q

750 nm in frequency

A

400 Thz.

Also red light

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13
Q

3 Phz in wavelength

A

10 um

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14
Q

455 nm to frequency

A

659 Thz

Also violet light

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15
Q

480 nm to frequency

A

625 Thz

Also blue light

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16
Q

550 nm to frequency

A

545 Thz

Also green light

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17
Q

750 nm to frequency

A

400 Thz

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18
Q

Optical fiber index of refraction

A

1.47

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19
Q

In telecom fiber both the core and cladding is made of

A

Plastic, glass or silica

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20
Q

Protective cover is made of

A

One or more layers of polymer or other protective substances

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21
Q

At the output of the fiber the varying path delays result in a

A

Smearing of the output signal as a function of time.

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22
Q

Smearing of the output signal as a function of time. AKA

A

Modal dispersion

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23
Q

As the diameter of the core of the fiber decreases the number of paths for light

A

Also decreases.

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24
Q

Typical multi mode fiber core size

A

50-62.5 um

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25
Q

Typical single mode fiber core diameter

A

9 um

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26
Q

Typical cladding size for both single and multi mode fibers

A

125 um

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27
Q

Fiber bent to sharply results in

A

Macrobend

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28
Q

Tool to use finding macro bends

A

Visual fault locator

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29
Q

Bend radius for fiber

A

5-10 times the outer diameter unloaded

15 times the outer diameter loaded

1 inch or 3cm for single mode fiber

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30
Q

Causes high loss by allowing light to escape into the cladding

A

Macrobend

31
Q

Tiny kinks or nicks in fiber during manufacturing or by mishandling

A

Microbends

32
Q

Components of an optical fiber cable.

A 
Optical fiber
Buffer tube
Strength member
Water blocking elements
Armor
Jacket
33
Q

Contains multiple bundles of fibers.that are loosely grouped in a hollow buffer tube that surrounds a central member

A

Central loose tube

34
Q

Has groups of fibers contained in buffer tubes to facilitate fiber identification and fiber splicing

A

Stranded loose tube.

35
Q

Typical fiber bundle contains how many fibers.

A

12 fibers

36
Q

Has multiple fibers arranged in a flat row

A

Ribbon fiber or stacked ribbon fiber

37
Q

Directly codes digital 1s and 0s as pulses of light

A

Baseband digital modulation

38
Q

Varies the intensity of light in direct proportion to the analog signal that is applied

A

Analog intensity modulation

39
Q

Is robust and can be sent long distances over optical fibers

A

Baseband digital modulation

40
Q

Does not require linear optical sources or optical detectors

A

Baseband digital modulation

41
Q

BDM requires optical sources to be turned up and down how offten

A

Millions or billions of times per second

42
Q

A seniconductor device that converts light into an electrical current

A

Photodiode

43
Q

Highly linear optical sources and detectors are required for high quality

A

Analog intensity modulation

44
Q

A 1 dB change in optical loss will result in what for the electrical output

A

2 dB change

45
Q

Analog intensity modulation can use this as an input and will produce this as an output

A

RF signal

46
Q

Constructed using special fibers that have been doped(infused with) special impurities

A

Fiber amplifier

47
Q

Used where high optical power is required at the input of the optical fiber

A

EDFA

48
Q

Used where links of 75 mi are possible using a wavelength of 1550 nm

A

EDFA

49
Q

EDFA’s produce an optical power in the range of

A

+26 dBm
Almost half a watt
Can cause severe eye damage and burn connectors if not handled properly

50
Q

Popular because of spetral purity, linearity and excellent power output levels

A

DFB
Distributed feed back
Can produce +11 dBm

51
Q

Has low output and high dispersion

A

Fabre-Perot

52
Q

An optical technology allowing multiple optical signals onto a single fiber by using different wavelengths

A

Wave division multiplexing

53
Q

Architecture that directly connects the headend to a customer premise location

A

FTTP

54
Q

Conventional HFC networks can also be called

A

Fiber to the node

55
Q

Removes all amplifiers between the optical node and customer premise

A

Fiber deep.

56
Q

ODN

A

Optical distribution network

57
Q

Describes networks in which the fiber extends to within several hundred miles of the customers home or not all the way to customers home

A

FTTP

58
Q

This is a passive optical splitter

A

Multiplexing point

59
Q

By reducing the amount of hardline cable we limit exposure to

A

Ingress and egress

60
Q

Mid split frequency range up and down

A

5-88 up
108- 1002 down
All MHz

61
Q

Take in fiber from headend or hub and distribute it to within 1000’ of the customer home

A

Multiplexing point

62
Q

R-ONU acts a an interface between these two things

A

ODN and the subscriber coaxial wiring.

63
Q

Ethernet standard for EPON

A

802.3ah

64
Q

A router with Ethernet interfaces on one side and coax RF interfaces on the other side

A

CMTS

65
Q

GPON ODN interfaces with

A

ONT

Optical network terminal

66
Q

EPON ODN interfaces with

A

ONU

Optical network unit

67
Q

Use this to examine optical fibers

A

Video fiber scope

68
Q

When cutting or splicing you should work above a

A

Tacky mat

69
Q

Fiber working table should be

A

A flat smooth surface
Chemical resistant
Dark preferably black

70
Q

Floor of the work area for fiber should be

A

Smooth material such as a coated or polished concrete

Made of a non patterned flooring material

71
Q

What should you use to pick up fiber remnants

A

Teflon tipped tweezers

72
Q

Damage to eye from amplified light

A

Retinal burns or

Cataracts

73
Q

Affected tissue shows burn characteristics and damage due to

A

Denaturation of protein

74
Q

Used to detect the output of a fiber optic line

A

Infrared detection card

War Games (7 decks)

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