Flashcards in SLC - Fiber Optics Exam Study Deck (91)
What material is best used for a ferrule?
What are 3 traits of a fiber optic connector?
What class is a eye safe laser?
What is a VFL?
Visual Fault Locator
What class does a VFL fall under?
How do you properly dispose of optical fiber?
Through a clearly marked container labeled Fiber Optical Disposal
What must be available when working with chemicals?
Material Safety Data Sheets (MSDS)
When cleaving, at what position do you want your blade at?
Pure quartz silica glass melts at how many degrees Celsius?
2000 Degrees Celsius
Diodes of the fusion splicer heat the glass to how many degrees Celsius?
1,200 Degrees Celsius
What is the maximum loss allowed using a fusion splicer?
.3 db loss
What are some common causes of a fixed v-groove offset?
Debris on fiber
Different fiber optic diameter
At what arc count does a diode need to be replaced on a fusion splicer?
Over 1000 count
The splicing environment must be ________ as possible?
What must be done before daily splicing operations may be conducted?
Must perform an arc test on the fusion splicer device
Where is the most common location for a fusion splice to fail?
The direct splice location
What year did AT&T and GTE install the first commercial phone system?
What are the advantages of optical fiber?
Info Carrying capacity
Small form factor
How much is a micrometer?
How much is a nanometer?
What are the primary parts of a fiber optic cable?
What is a mode?
The path of a ray of light through glass
What does LED stand for?
Light emitting diode
What is reflection?
Light that bounces off an interface
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?
How many microns is a buffer?
What is the numerical aperture?
The light gathering ability of fiber
Multi mode cable has what color of jacket?
OM1 & OM2 are considered what?
Legacy- multi mode
Fiber optics operate at what mode of the spectrum?
What are the two most common dimensions of a multi mode cable?
What are the most common dimensions of single mode fiber?
What color is the jacket of single mode fiber?
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?
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?
How much light travels through the cladding?
What 3 materials do loose tube contain?
The gel, tape, and powder in loose tube prevent what?
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?
What are the last 6 colors of a fiber optics coloring code?
Resolution is described as a __________?
How fast is the speed of light in a vacuum?
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?
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?
1 milliwatt mW = _______ decimal per meter
What is the number one problem in maintaining an optical network?
All connectors must be _______ prior to testing
TIA 568-c test method _________ requires one measured quality jumper
What is the cable loss for 850 nm wavelength's?
What is the cable loss for 1300 nm wavelength?
What is the typical output power of an LED?
-15 dBm to -20 dBM
0dBm is equal to?
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
How is the power controlled in OTDR device?
By adjusting the pulse width
_______ determines how far out the OTDR will display the fiber trace
What must be present at the end of the trace to ensure an adequate range?
_______ wavelengths are more succesable to Bending losses than shorter wavelengths
Longer wave lengths