SLC - Fiber Optics Exam Study Flashcards by Gabriel Carbajal

What material is best used for a ferrule?

Ceramic

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What are 3 traits of a fiber optic connector?

Low cost
Easy installation
Low loss
Repeatability

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What class is a eye safe laser?

Class 1

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What is a VFL?

Visual Fault Locator

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What class does a VFL fall under?

Class 3A

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How do you properly dispose of optical fiber?

Through a clearly marked container labeled Fiber Optical Disposal

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What must be available when working with chemicals?

Material Safety Data Sheets (MSDS)

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

Perpendicular

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Pure quartz silica glass melts at how many degrees Celsius?

2000 Degrees Celsius

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

1,200 Degrees Celsius

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What is the maximum loss allowed using a fusion splicer?

.3 db loss

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

Dirt
Debris on fiber
Different fiber optic diameter

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

Over 1000 count

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The splicing environment must be ________ as possible?

Clean

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

Must perform an arc test on the fusion splicer device

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

The direct splice location

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

1977

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What are the advantages of optical fiber?

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

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How much is a micrometer?

Millionth Um

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How much is a nanometer?

Billionth nm

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What are the primary parts of a fiber optic cable?

Transmitter
Receiver
Connector
Cable

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What is a mode?

The path of a ray of light through glass

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What does LED stand for?

Light emitting diode

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What is reflection?

Light that bounces off an interface

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What is refraction?

Light rays that bend while changing speed

What is the critical angle?

Smallest angle at which total internal reflection occurs

How many microns is a cladding core?

125 microns

How many microns is a buffer?

900 microns

What is the numerical aperture?

The light gathering ability of fiber

Multi mode cable has what color of jacket?

Orange

OM1 & OM2 are considered what?

Legacy- multi mode

Fiber optics operate at what mode of the spectrum?

Infrared

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

850 nm | 1300 nm

What are the most common dimensions of single mode fiber?

1310 nm | 1550 nm

What color is the jacket of single mode fiber?

Yellow

OS1 & OS2 are what?

Laser diode light source

What are the dimensions of a multi mode fiber core?

62.5 / 50 microns

What is the dimensions of a single mode fiber core?

8 - 10 microns

What light source does OM3 & OM4 use?

VCSEL (LED) transmitting light source

What color of jacket is a OM3 & OM4?

Aqua

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

20x the outside diameter of the cable

What is outdoor fiber made of?

Loose tube cable

What does the NEC stand for?

National Electrical Code

How many years is the NEC updated?

Every 3 years

How much light travels through the core?

80%

How much light travels through the cladding?

20%

What 3 materials do loose tube contain?

Gel Tape Powder

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

Water

What is Article 777?

The listing and marking of fiber optic cable

What is plenum rated cable?

Fire retardant and low smoke rated cable

What is conducive cable mean?

Contains conductive strength or other conductive material

What is non-conductive cable mean?

Contains no metallic strength members and no other electric conductive material

What is a composite hybrid cable?

Carries a optical fiber and current carrying conductors

What is wave guide dispersion?

Light that travels in both the core and cladding

What is material dispersion?

Light traveling at different wave lengths and at different speeds

What is model dispersion?

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

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

``` Blue Orange Green Brown Slate White ```

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

``` Red Black Yellow Violet Rose Aqua ```

Resolution is described as a __________?

Distance

How fast is the speed of light in a vacuum?

186,000

What are the two types of resolutions?

Data sampling and spatial resolution

What does tight buffer breakout have a layer of?

Layer of Kevlar on each strand

What is an example of distribution?

Tight buffer

What is the formula for the index of a refraction?

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

What does a fusion profile alignment system offer?

High resolution CCD camera

A 3 decimal loss is how much loss in power?

50.1%

1 milliwatt mW = _______ decimal per meter

0 dBm

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

Contamination

All connectors must be _______ prior to testing

Cleaned

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

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

3.5dB

What is the cable loss for 1300 nm wavelength?

1.5dB

What is the typical output power of an LED?

-15 dBm to -20 dBM

0dBm is equal to?

1 mW

What does OTDR stand for?

Optical time domain reflectometer

What is backscatter?

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

What does OTDR measure?

Level of backscatter

What is Fresnel reflection?

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

What are the two types events?

Reflective and non-reflective

What is some reflective type of events?

Connectors, mechanical splices and breaks are typically reflective events

What are some non-reflective type of events?

Fusion spices and excessive bends in the cable

What determines a dead zone?

Pulse width determines the length of the dead zone

What is an event dead zone?

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

What is an attenuation dead zone?

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

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

Loser or Gainer

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

Light absorption

How is the power controlled in OTDR device?

By adjusting the pulse width

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

Range

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

Noise

_______ wavelengths are more succesable to Bending losses than shorter wavelengths

Longer wave lengths

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

Blue