Fiber

Question 1

Identify the use of the following tools that are used in fiber optic termination:
Scribe -
Puck - 
Stripper -
Cleaver -
Microscope -
OTDR - 
Polishing Film -

Answer 1

Scribe - Hard, sharp tool that scratches the fiber to allow cleaving.
Puck - Tool for connectors that require polishing - - the puck holds connector to polish film.
Stripper - Cutter for removing heaving outside jacket of cables.
Cleaver - Breaks the fiber to produce a flat end for polishing or splicing (cut).
Microscope -
OTDR - Optical Time-Domain Reflectometer - Instrument uses backs-cattered light to take a snapshot of optical fiber; measures length, splice loss, or fiber attenuation; also fault location.
Polishing Film - Fine grit film used to polish the end of connector ferrule.

Question 2

Identify the following connectors and their characteristics:
SC -
ST -
LC -

Answer 2

SC -
ST -
LC -

Question 3

Define the following terms with regard to fiber optic cable:
Reflection - 
Refraction - 
Attenuation - 
Dispersion -

Answer 3

Reflection - amount of light that is refelcted back up the fiber toward the light source
Refraction - amount of light that passes through a boundary
Attenuation - signal loss
Dispersion - Different modes travel at different speeds

Question 4

Explain the difference in physical construction (core/cladding/jacket color) between the following fiber optic types and be prepared to identify the connectors for the following:
OM1 - 
OM2 - 
OM3/OM4 - 
Wideband LO MM - 
OS1/OS2 -

Answer 4

µm = micron
Jacket Connector Core
OM1 - Orange Biege 62.5 µm
OM2 - Orange Black 50 µm
OM3/OM4 - Aqua Aqua 50 µm
Wideband LO MM - ? ? ?
OS1/OS2 - Yellow Blue 9 µm

Question 5

What is the complete color code for a 144 strand fiber optic cable?

Answer 5

A

Question 6

21 Be prepared to identify which fiber optic cables may be substituted for another, and bonding rules are according to the NEC.

Answer 6

aa

Question 7

What are the types of bends that we need to be concerned about when installing fiber, and what are they usually caused by what?

Answer 7

micro - overbending

macro - crushing

Question 8

(#26) What are the wavelengths of “light” used for the various types of fiber, and how does that compare with the visible light spectrum?

Answer 8

a

Question 9

What is the difference between graded index and step index fiber?

Answer 9

Step - single boundary for reflection

Graded has multiple cores.

Question 10

What is absorption in fiber and what causes it?

Answer 10

Loss from signal being converted to heat (elements absorb the light)

Question 11

What’s the outside diameter of malt/single mode?

the inside?

Answer 11

125 microns; 250mm protective coat

single 9 microns; multi 50/62.5 microns

Question 12

What’s the single path from fiber ranges from?

Answer 12

8mm to 62.5mm

jacket - covering

Question 13

Define the following terms:
Jacket - 
Buffer - 
Cladding - 
Core -

Answer 13

Jacket - covering
Buffer - color-coded plastic covering
Cladding - glass
Core - glass path for the signal

Question 14

Name two types of splicing.

Answer 14

Fusion - welding two fibers together

Mechanical - locking two fibers together