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Fiber Optics Communications
Topics
• Fiber Materials
• Fiber Manufactoring
Fiber Materials
• Requirements for optical fiber material
– It must be possible to make long thin, flexible
fibers from the material
– Material must be transparent at a particular
optical wave length in order for fiber to guide light
efficiently
– Physically compatible materials that have slightly
different refractive indices for core and cladding
must be available
Fiber Materials
• Materials that satisfy these requirements are
glasses and plastic
• Majority of fibers are made of glass consisting
of either silica or silicate.
• Plastic fibers are less widely used because of
their higher attenuation
• Plastic fibers are used for short distance
applications (several hundred meters) and
abusive environments
Glass Fiber
• Glass is made by fusing mixture of metal
oxides, sulfides, or selenides. The resulting
material is a randomly connected molecular
network rather a well defined structure as
found in crystalline materials
• A consequence of this random order is glass
does not have a well defined melting point
• When glass is heated , it gradually begins to
soften until it becomes a viscous liquid
Glass Fiber
• Optical fiber are made from oxide glasses and
most popular is silica (SiO2) which has
refractive index of 1.458 at 850 nm.
• To produce two similar materials with slightly
different refraction indices for core and
cladding, either fluorine or other oxides
(dopants) are added to silica
Glass Fiber
• Sand is the principle raw material for silica
• Glass composed of pure silica is referred to as
either silica glass, fused glass, or vitreous silica.
• Desired properties are
– resistance to deformation at temperatures as high as
1000 C
– High resistance to breakage from thermal shock
– Good chemical durability
– High transparency in both visible and infrared regions
of interest
Plastic Optical Fibers
• Growing demand for delivering high-speed
services to workstations
• Have greater optical signal attenuations than
glass fiber
• They tough and durable
• Core diameter is 10-20 times larger
Fiber Fabrication
• Two basic techniques
– Vapor-phase oxidation process
• Outside vapor phase oxidation
• Vapor phase axial deposition
• Modified chemical vapor deposition
– Direct-melt methods
Fiber Fabrication
• Direct melt method
– Follows traditional glass making procedures
– Optical fiber are made directly from molten state of
purified components of silicate glass
• Vapor phase oxidation
– Highly pure vapors of metal galides (SiCl4) react with
oxygen to form white powder of SiO2 particles
– Particles are collected on surface of bulk glass by
above methods and are transformed to a
homogenous glass by heating without melting to form
a clear glass rod or tube. This rod is called preform
– Preform is 10-25 mm in diameter and 60-120 cm long.
optical fibre communication
Fabrication
– Prefrom is fed into circular heater called drawing
furnace.
– Preform end is softened to the point where it can
be drawn into a very thin filament which becomes
optical fiber
– The speed of the drum at the bottom of draw
tower determines how fast and in turn how thick
the fiber is
– An elastic coating is applied to protect the fiber
Outside Vapor Phase Oxidation
• Core layer is deposited on a rotating ceramic
rod
• Cladding is deposited on top of core layer
• Ceramic rod is slipped out (different thermal
expansion coefficient)
• The tube is heated and mounted in a fiber
drawing tower and made into a fiber
• The central hole collapses during this drawing
process
optical fibre communication
Vapor Phase Axial Deposition
• Similar to outside vapor deposition
• Starts with a seed which is a pure silica rod
• The preform is grown in the axial direction by moving
rod upward
• Rod is also rotated to maintain cylindrical symmetery
• As preform moves upward it is transformed into a solid
transparent rod preform by zone melting (heating in a
narrow localized zone)
• Advantages
– No central hole
optical fibre communication
Modified Chemical Vapor Deposition
• Pioneered at Bell Labs, and adopted to produce low loss graded
index fiber
• Glass vapor particles, arising from reaction of constituent metal
halide gasses and oxygen flow through inside of revolving silica tube
• As SiO2 particles are deposited, they are sintered to a clear glass
layer by an oxyhydrogen torch which travels back and forth
• When desired thickness of glass have been deposited, vapor flow is
shut off
• Tube is heated strongly to cause it to collapse into a solid rod
prefrom
• Fiber drawn from this prefrom rod will have a core that consists of
vapor deposited material and a cladding that consists of original
silica tube.
optical fibre communication
Double Crucible Method
• Silica and halide glass fiber can all be made using a
direct-melt double crucible technique
• Glass rods for the core and cladding materials are
first made separately by melting mixtures of
purified powders
• These rods are then used as feedstock for each of
two concentric crucibles
• Advantage of this method is being a continuous
process
• Careful attention must be paid to avoid
contaminants during metling
optical fibre communication

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optical fibre communication

  • 2. Topics • Fiber Materials • Fiber Manufactoring
  • 3. Fiber Materials • Requirements for optical fiber material – It must be possible to make long thin, flexible fibers from the material – Material must be transparent at a particular optical wave length in order for fiber to guide light efficiently – Physically compatible materials that have slightly different refractive indices for core and cladding must be available
  • 4. Fiber Materials • Materials that satisfy these requirements are glasses and plastic • Majority of fibers are made of glass consisting of either silica or silicate. • Plastic fibers are less widely used because of their higher attenuation • Plastic fibers are used for short distance applications (several hundred meters) and abusive environments
  • 5. Glass Fiber • Glass is made by fusing mixture of metal oxides, sulfides, or selenides. The resulting material is a randomly connected molecular network rather a well defined structure as found in crystalline materials • A consequence of this random order is glass does not have a well defined melting point • When glass is heated , it gradually begins to soften until it becomes a viscous liquid
  • 6. Glass Fiber • Optical fiber are made from oxide glasses and most popular is silica (SiO2) which has refractive index of 1.458 at 850 nm. • To produce two similar materials with slightly different refraction indices for core and cladding, either fluorine or other oxides (dopants) are added to silica
  • 7. Glass Fiber • Sand is the principle raw material for silica • Glass composed of pure silica is referred to as either silica glass, fused glass, or vitreous silica. • Desired properties are – resistance to deformation at temperatures as high as 1000 C – High resistance to breakage from thermal shock – Good chemical durability – High transparency in both visible and infrared regions of interest
  • 8. Plastic Optical Fibers • Growing demand for delivering high-speed services to workstations • Have greater optical signal attenuations than glass fiber • They tough and durable • Core diameter is 10-20 times larger
  • 9. Fiber Fabrication • Two basic techniques – Vapor-phase oxidation process • Outside vapor phase oxidation • Vapor phase axial deposition • Modified chemical vapor deposition – Direct-melt methods
  • 10. Fiber Fabrication • Direct melt method – Follows traditional glass making procedures – Optical fiber are made directly from molten state of purified components of silicate glass • Vapor phase oxidation – Highly pure vapors of metal galides (SiCl4) react with oxygen to form white powder of SiO2 particles – Particles are collected on surface of bulk glass by above methods and are transformed to a homogenous glass by heating without melting to form a clear glass rod or tube. This rod is called preform – Preform is 10-25 mm in diameter and 60-120 cm long.
  • 12. Fabrication – Prefrom is fed into circular heater called drawing furnace. – Preform end is softened to the point where it can be drawn into a very thin filament which becomes optical fiber – The speed of the drum at the bottom of draw tower determines how fast and in turn how thick the fiber is – An elastic coating is applied to protect the fiber
  • 13. Outside Vapor Phase Oxidation • Core layer is deposited on a rotating ceramic rod • Cladding is deposited on top of core layer • Ceramic rod is slipped out (different thermal expansion coefficient) • The tube is heated and mounted in a fiber drawing tower and made into a fiber • The central hole collapses during this drawing process
  • 15. Vapor Phase Axial Deposition • Similar to outside vapor deposition • Starts with a seed which is a pure silica rod • The preform is grown in the axial direction by moving rod upward • Rod is also rotated to maintain cylindrical symmetery • As preform moves upward it is transformed into a solid transparent rod preform by zone melting (heating in a narrow localized zone) • Advantages – No central hole
  • 17. Modified Chemical Vapor Deposition • Pioneered at Bell Labs, and adopted to produce low loss graded index fiber • Glass vapor particles, arising from reaction of constituent metal halide gasses and oxygen flow through inside of revolving silica tube • As SiO2 particles are deposited, they are sintered to a clear glass layer by an oxyhydrogen torch which travels back and forth • When desired thickness of glass have been deposited, vapor flow is shut off • Tube is heated strongly to cause it to collapse into a solid rod prefrom • Fiber drawn from this prefrom rod will have a core that consists of vapor deposited material and a cladding that consists of original silica tube.
  • 19. Double Crucible Method • Silica and halide glass fiber can all be made using a direct-melt double crucible technique • Glass rods for the core and cladding materials are first made separately by melting mixtures of purified powders • These rods are then used as feedstock for each of two concentric crucibles • Advantage of this method is being a continuous process • Careful attention must be paid to avoid contaminants during metling