FIBRE OPTICS

INTRODUCTIONTO

FIBRE OPTIC CABLES

HOW DOES FIBRE OPTIC WORK ?

Carries Signals as Light Pulses

signals converted from electrical to light (and visa-versa) by special equipment

e.g. fibre-optic “transceiver” (transmitter / receiver)

FIBRE CONSTRUCTION

125 Cladding Glass 8, 50, 62.5Core Glass

PRIMARY BUFFER

Core (62.5)

Cladding 125

Primary Buffer 250

SECONDARY BUFFERSecondary Buffer 900

Primary Buffer 250

Cladding 125Core (62.5)

FIBRE MATERIAL Silica Glass

used for high-speed data applications

Plastics used for low-speed data / voice applications

Composite Constructions used for low-speed and specialized

applications

FIBRE TRANSMISSION Multi-Mode

graded-index used for short / medium distance applications

step-indexearly fibre type - no longer used

Single-Mode a.k.a Mono-Mode

used for long-distance / very high-speed applicationse.g. cross-country and transatlantic communications

LIGHT TRANSMISSION

MultiModeStep Index

MultiModeGraded Index

SingleMode

COMMON FIBRE SIZES

125 µm

50 µm

125 µm

62.5 µm

140 µm

100 µm

125 µm

8 µm

MultiMode Graded Index SingleMode

TIGHT JACKET

Kevlar FibresOuter Jacket

Optical Fibre(with Primary & Secondary Buffers)

LOOSE TUBE CONSTRUCTION

Tube

Gel filled loose tube

Optical Fibre(with Primary Buffer)

FIBRE CABLE CONSTRUCTION

Tight-Buffer fibre has primary and secondary coatings outer jacket is drawn tight over fibre

used mainly for “indoor” applications

Loose-Tube fibre has primary buffer only fibres are loosely-packed in support tube

used mainly for “outdoor” applications

INDUSTRIAL FIBRE CABLES

OUTER SHEATH

POLYMERIC TUBES

FILLERS

MULTIMODEFIBRES

INTERSTICES

OUTER SHEATH

MULTI MODEFIBRES

ARAMID YARNS

GEL FILLED TUBE

NON-METALLIC FIBRE OPTIC DUCT CABLE 2-12 FIBRE

NON-METALLIC FIBRE OPTIC DUCT CABLE 12-24 FIBRE

DATA SHEET SST1

DATA SHEET SST2

INDUSTRIAL FIBRE CABLES

OUTER SHEATH

INNER SHEATH

GEL FILLED TUBES

MULTIMODEFIBRES

INTERSTICES

NON-METALLIC FIBRE OPTIC EXTERNAL CABLE 2 - 24 FIBRES

SHEATH

ARMOUR

MULTI MODEFIBRES

BEDDING

ARAMID YARNS

INDOOR/OUTDOOR INDUSTRIAL CABLE 2-12 FIBRE

DATA SHEET SST5

DATA SHEET SST6

OUTER SHEATH

BRAID

INNER SHEATH

MICA TAPED LOOSE TUBES

STRENGTH MEMBER

INDUSTRIAL FIBRE CABLES

FIRE SURVIVAL FIBRE OPTIC CABLEDATA SHEET SST7

INDUSTRIAL FIBRE CABLES

OUTER SHEATH

INNER SHEATH

ARMOUR

GEL FILLED TUBES

MULTIMODEFIBRES

OUTER SHEATH

LEAD SHEATH

ARMOUR

MULTIMODEFIBRES

GEL FILLED TUBES

ARMOURED FIBRE OPTIC CABLE 2-24 FIBRE

LEAD SHEATHED AND ARMOURED FIBRE OPTIC CABLE 2-24 FIBRE

DATA SHEET SST3

DATA SHEET SST4