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Fibre Optics Infrastructure > Types of fibre > Flashcards

Types of fibre Flashcards

1
Q

What is the makeup of Fibre?

A

Secondary coating
Primary coating
Glass Cladding
Variable Glass Core

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2
Q

2 types of Variable core diameters?

A

Multimode

Single-mode 9

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3
Q

OM 1 are what size and mode?

A

62.5 micron m & MM

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4
Q

OM 2, 3 & 4 are what size and mode?

A

50 micron m & MM

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5
Q

OS 1 & 2 are what size and mode?

A

9 micron m & SM

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6
Q

What FO cable is used outside?

A

Loose tube construction

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7
Q

What type of FO cable is used inside?

A

Tight Buffer - Tight Jacket construction

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8
Q

Name 3 other common FO cable variants?

A

Ribbon fibre
Hybrid cables
COMposite cable (Contains Optical Metallic)
Blown fibre

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9
Q

What colour is Multimode 50/125 OM3/OM4?

A

AQUA

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10
Q

What is the colour code for SM & MM Patch cords?

A

Yellow - Single mode 9/125
Orange or Grey - Mulitimode 62.5/125 OM1
Aqua - Multimode 50/125 OM3/OM4
Green - Multimode 100/140

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11
Q

Colour code for FO?

A

Blue, Orange, Green, Brown, Slate, White, Red Black, Yellow, Violet, Rose, Aqua

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12
Q

Briefly explain Multi-mode Fibre & what is it subject too?

A

The core is big enough to allow Multiple Paths of light to propogate down the fibre each time the Tx emits a pulse of light and is subject to MODAL DISPERSION

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13
Q

Briefly explain Single-Mode Fibre & what is it subject too?

A

Core is big enough to allow a single Path of light to propogate down the fibre & is subject to Chromatic dispersion

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14
Q

_______ is the shortest wavelength at wich fibre will sustain a SM profile and is _____nm

A

Cut-off Wavelength

1310nm

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15
Q

How is attenuation measured ?

A

dB/km

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16
Q

How is bandwith measured

A

MHz.Km (MHz@Km)

17
Q 
What is the attenuation for the following?
OM1` 62.5um @ 850nm and 1300nm
OM2 50um @ 850nm and 1300nm
OM3 50um 850nm and 1300nm
OM4 50um 850nm and 1300nm
A

OM1 - 3.5 & 1.5
OM2 - 3.5 & 1.5
OM3 - 3.5 & 1.5
OM4 - 3.5 & 1.5

18
Q 
MM bandwith limits for the following are?
OM1 62.5/125 @ 850nm and 1300nm
OM2 50/125 @ 850nm and 1300nm
OM3 50/125 @ 850nm and 1300nm
OM4 50/125 @ 850nm and 1300nm
A

OM1 - 160min & 500min
OM2 - 500min & 500min
OM3 - 1500min & 500min
OM4 - 3500min & 500min

19
Q

SM attenuation for the following are?
OS1 @ 1310nm and 1550nm
OS2 @ 1310nm and 1550nm

A

OS1 - 1.0 and 1.0

OS2 - 0.4 and 0.4

Fibre Optics Infrastructure (10 decks)

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