NAVEDTRA 14196A, NAVY ELECTRICITY AND ELECTRONICS TRAINING SERIES MODULE 24-FIBER OPTICS

Question 1

How many parts do optical fibers consist of?

Answer 1

4

Question 2

What is the only mode that can be propagated by single mode fibers?

Answer 2

Fundamental

Question 3

What describes the value of refractive index as a function of radial distance at any fiber diameter?

Answer 3

Refractive index profile

Question 4

In which type of fiber is the refractive index of the core uniform and undergoes an abrupt change at the core-cladding boundary?

Answer 4

Step-index

Question 5

In which type of fiber does the refractive index of the core vary gradually as a function of the radial distance from the fiber center?

Answer 5

Graded

Question 6

Which type of fiber production is exclusively step-index?

Answer 6

Single mode

Question 7

What are the small amounts of elements other than silica and oxygen called that are added to glass material to change its index of refraction?

Answer 7

Material dopants

Question 8

How many layers of material does a multimode step-index fiber consist of?

Answer 8

2

Question 9

What limits the bandwidth or information-carrying capacity of fiber?

Answer 9

Dispersion

Question 10

Graded-index fibers are primarily used in LAN topologies typically less than what length?

Answer 10

2 kilometers

Question 11

PCS fibers are used in applications typically less than how many meters?

Answer 11

20

Question 12

Which type of cables are run and housed in the walls of the building?

Answer 12

Riser

Question 13

Which style cables are the approved cable types for Naval ships that produce low smoke, releases no halogens, and emit very limited amounts of other toxins?

Answer 13

Low-Smoke-Zero-Halogen (LSZH)

Question 14

How many different methods are used by fiber manufacturers to fabricate multimode and single mode glass fibers?

Answer 14

2

Question 15

Which method is the most common direct-melt process?

Answer 15

Double-crucible

Question 16

What protect the optical fiber from breakage and loss caused by microbends?

Answer 16

Coatings and buffers

Question 17

Tight-buffered, loose-tube, along with what else make up the different types of fiber buffers?

Answer 17

Gel-filled loose-tube

Question 18

Which type of fiber buffer is used in commercial building and Navy applications?

Answer 18

Tight

Question 19

What are used by fiber optic cables to increase the cables’ strength and protect the fiber from strain?

Answer 19

Strength members

Question 20

What is the only type of cable design that will meet the harsh conditions that the cables will be exposed to for Navy systems?

Answer 20

Tight Buffered Breakout

Question 21

What are the individual signal fiber cables called that make up a tight buffered breakout cable?

Answer 21

Optical Fiber Cable Components (OFCCs)

Question 22

An OFCC cable generally contains less than how many fibers (OFCCs)?

Answer 22

36

Question 23

What is the typical size of the OFCC outer diameter?

Answer 23

2 mm

Question 24

Which type of cable is a fiber optic cable consisting of buffered fibers stranded down the center of the cable surrounded by strength members and a protective jacket?

Answer 24

Distribution

Question 25

How many fibers can ribbon cables hold in a 0.5-inch cable?

Answer 25

204

Question 26

Which type of cables are installed with no fibers in the tubes within the cable?

Answer 26

Blown Optical Fiber (BOF)

Question 27

Which year were the first fibers blown into a fiber optic cable plant on the USS Truman?

Answer 27

1997

Question 28

What is the maximum vertical blowing distance for Blown Optical Fiber?

Answer 28

1,000 feet

Question 29

What is the maximum horizontal blowing distance for Blown Optical Fiber?

Answer 29

3280 feet