Fiber Optics

Question 1

Core

Answer 1

Portion of fiber strand that carries transmitted light

Question 2

Cladding

Answer 2

Material surrounding core of a fiber optic cable

Question 3

Numerical Aperture

Answer 3

Specification by manufacturer indicating fiber’s ability to accept light

Question 4

Light waves just below frequencies in visible spectrum?

Answer 4

Infrared

Question 5

Attenuation

Answer 5

Loss of power introduced by the fiber

Expressed as decibels per kilometer (dB/km)

Question 6

Scattering

Answer 6

Accounts for 96% of loss

Caused by refractive index fluctuations

Question 7

Absorption

Answer 7

Conversion of optical power to heat

Question 8

Macrobending

Answer 8

Light breaking up and escaping into the cladding

Question 9

Microbending

Answer 9

Caused by mechanical stress on fiber strand

Question 10

Dispersion

Answer 10

Pulse Broadening

Distance-limiting parameter in fiber-optic transmissions

Question 11

Modal Dispersion

Answer 11

Broadening of pulse due to different path lengths taken through the fiber by different modes
Mostly in multimode fiber

Question 12

Chromatic Dispersion

Answer 12

Broadening of pulse due to different propagation velocities of the spectral components of light pulse
Present in single and multimode fiber

Question 13

Polarization Mode Dispersion

Answer 13

Broadening of pulse due to different propagation velocities of the x and Y polarization components of the light pulse
Single-mode

Question 14

DL

Answer 14

Diode Laser
Preferred source for moderate to wideband systems
Fast response time

Question 15

LED

Answer 15

Light-emitting diode

Cheaper, less complex driving circuitry

Question 16

Isolator

Answer 16

Inline passive device that allows optical power to flow only one direction

Question 17

Attenuator

Answer 17

Reduce received signal level

Question 18

RSL

Answer 18

Received Signal Level

Question 19

Branching Device

Answer 19

Used to divide single optical signal into several receivers

Question 20

Splitter

Answer 20

Divide optical signal for distribution

Question 21

Wavelength Divsion Multiplexer

Answer 21

Combine or divide optical signals

Question 22

Optical-line Amplifiers

Answer 22

Analog amplifiers

Question 23

Detectors

Answer 23

Convert transmitted light back into an electrical signal

Question 24

Fusion Splicing

Answer 24

Two fibers are welded together . Stripped wires are inserted and aligned in a splicer, glass is melted with electric arc.

Question 25

Mechanical Splicing

Answer 25

Join two fibers together but leave an air gap

Question 26

Index-Matching Gel

Answer 26

Applied to the joint of a mechanical splice

Question 27

SONET

Answer 27

Synchronous Optical Network

Question 28

STS

Answer 28

Synchronous Transport Signals

Question 29

OC

Answer 29

Optical Carrier

Question 30

FTTC

Answer 30

Fiber to the Curb

Question 31

FTTH

Answer 31

Fiber to the Home

Question 32

FTTB

Answer 32

Fiber to the Business

Question 33

FTTD

Answer 33

Fiber to the Desktop