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Network and Security - Foundations > Fiber Optics > Flashcards

Fiber Optics Flashcards

1
Q

Core

A

Portion of fiber strand that carries transmitted light

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2
Q

Cladding

A

Material surrounding core of a fiber optic cable

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3
Q

Numerical Aperture

A

Specification by manufacturer indicating fiber’s ability to accept light

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4
Q

Light waves just below frequencies in visible spectrum?

A

Infrared

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5
Q

Attenuation

A

Loss of power introduced by the fiber

Expressed as decibels per kilometer (dB/km)

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6
Q

Scattering

A

Accounts for 96% of loss

Caused by refractive index fluctuations

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7
Q

Absorption

A

Conversion of optical power to heat

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8
Q

Macrobending

A

Light breaking up and escaping into the cladding

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9
Q

Microbending

A

Caused by mechanical stress on fiber strand

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10
Q

Dispersion

A

Pulse Broadening

Distance-limiting parameter in fiber-optic transmissions

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11
Q

Modal Dispersion

A

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

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12
Q

Chromatic Dispersion

A

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

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13
Q

Polarization Mode Dispersion

A

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

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14
Q

DL

A

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

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15
Q

LED

A

Light-emitting diode

Cheaper, less complex driving circuitry

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16
Q

Isolator

A

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

17
Q

Attenuator

A

Reduce received signal level

18
Q

RSL

A

Received Signal Level

19
Q

Branching Device

A

Used to divide single optical signal into several receivers

20
Q

Splitter

A

Divide optical signal for distribution

21
Q

Wavelength Divsion Multiplexer

A

Combine or divide optical signals

22
Q

Optical-line Amplifiers

A

Analog amplifiers

23
Q

Detectors

A

Convert transmitted light back into an electrical signal

24
Q

Fusion Splicing

A

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

25
Q

Mechanical Splicing

A

Join two fibers together but leave an air gap

26
Q

Index-Matching Gel

A

Applied to the joint of a mechanical splice

27
Q

SONET

A

Synchronous Optical Network

28
Q

STS

A

Synchronous Transport Signals

29
Q

OC

A

Optical Carrier

30
Q

FTTC

A

Fiber to the Curb

31
Q

FTTH

A

Fiber to the Home

32
Q

FTTB

A

Fiber to the Business

33
Q

FTTD

A

Fiber to the Desktop

Network and Security - Foundations (15 decks)

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