FIBRE OPTICS INTRODUCTION TO FIBRE OPTIC CABLES HOW

FIBRE OPTICS INTRODUCTION TO FIBRE OPTIC CABLES

HOW DOES FIBRE OPTIC WORK ? Ø Carries Signals as Light Pulses ð 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. 5 Core Glass

PRIMARY BUFFER Primary Buffer 250 Cladding 125 Core (62. 5)

SECONDARY BUFFER Secondary Buffer 900 Primary Buffer 250 Cladding 125 Core (62. 5)

FIBRE MATERIAL Ø Ø Ø Silica Glass ð used for high-speed data applications Plastics ð used for low-speed data / voice applications Composite Constructions ð used for low-speed and specialized applications

FIBRE TRANSMISSION Ø Ø Multi-Mode ð graded-index used for short / medium distance applications ð step-index early fibre type - no longer used Single-Mode ð a. k. a Mono-Mode used for long-distance / very high-speed applications e. g. cross-country and transatlantic communications

LIGHT TRANSMISSION Multi. Mode Step Index Multi. Mode Graded Index Single. Mode

COMMON FIBRE SIZES 50 µm 62. 5 µm 125 µm Multi. Mode Graded Index 100 µm 140 µm 8 µm 125 µm Single. Mode

TIGHT JACKET Outer Jacket Kevlar Fibres Optical Fibre (with Primary & Secondary Buffers)

LOOSE TUBE CONSTRUCTION Tube Gel filled loose tube Optical Fibre (with Primary Buffer)

FIBRE CABLE CONSTRUCTION Ø Tight-Buffer ð fibre has primary and secondary coatings ð outer jacket is drawn tight over fibre used mainly for “indoor” applications Ø Loose-Tube ð fibre has primary buffer only ð fibres are loosely-packed in support tube used mainly for “outdoor” applications

INDUSTRIAL FIBRE CABLES NON-METALLIC FIBRE OPTIC DUCT CABLE 2 -12 FIBRE DATA SHEET SST 1 ARAMID YARNS GEL FILLED TUBE OUTER SHEATH MULTI MODE FIBRES NON-METALLIC FIBRE OPTIC DUCT CABLE 12 -24 FIBRE DATA SHEET SST 2 OUTER SHEATH MULTIMODE FIBRES POLYMERIC TUBES INTERSTICES FILLERS

INDUSTRIAL FIBRE CABLES NON-METALLIC FIBRE OPTIC EXTERNAL CABLE 2 - 24 FIBRES DATA SHEET SST 5 OUTER SHEATH GEL FILLED TUBES INTERSTICES MULTIMODE FIBRES INNER SHEATH INDOOR/OUTDOOR INDUSTRIAL CABLE 2 -12 FIBRE DATA SHEET SST 6 SHEATH ARMOUR MULTI MODE FIBRES BEDDING ARAMID YARNS

INDUSTRIAL FIBRE CABLES FIRE SURVIVAL FIBRE OPTIC CABLE DATA SHEET SST 7 OUTER SHEATH MICA TAPED LOOSE TUBES BRAID STRENGTH MEMBER INNER SHEATH

INDUSTRIAL FIBRE CABLES ARMOURED FIBRE OPTIC CABLE 2 -24 FIBRE DATA SHEET SST 3 GEL FILLED TUBES OUTER SHEATH INNER SHEATH MULTIMODE FIBRES ARMOUR LEAD SHEATHED AND ARMOURED FIBRE OPTIC CABLE 2 -24 FIBRE DATA SHEET SST 4 OUTER SHEATH LEAD SHEATH MULTIMODE FIBRES GEL FILLED TUBES ARMOUR