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Optical Fiber Cable. Optical Fiber Classification. Can be classified in a number of ways On the basis of manufacturing Single component/Multi component Glass core glass clad Doped silica core clad All plastic fiber On the basis of profile Step index Multi mode Mono mode Graded index .

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optical fiber cable

Optical Fiber Cable

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optical fiber classification
Optical Fiber Classification
  • Can be classified in a number of ways
  • On the basis of manufacturing
    • Single component/Multi component
      • Glass core glass clad
      • Doped silica core clad
      • All plastic fiber
  • On the basis of profile
    • Step index
      • Multi mode
      • Mono mode
    • Graded index

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multi mode step index
Multi Mode Step Index
  • Made up of glass or doped silica
  • Reasonably large core diameter and NA to facilitate efficient coupling of incoherent light
  • Performance characteristics vary widely depending upon material used in fabrication
  • Structure
    • Core diameter: 50 to 400 µm
    • Clad diameter: 125 to 500 µm
    • Buffer jacket diameter: 250 to 1000 µm
    • Numerical Aperture: 0.16 to 0.5

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multi mode step index4
Multi Mode Step Index
  • Performance characteristics
    • Attenuation
      • Approx 2.5 to 50 dB/Km @ 0.85 µm wavelength
      • 40 dB/Km for glass fiber
      • 5 dB/Km for doped silica fiber
      • 0.4 dB/Km @ 1.3 µm wavelength
    • Bandwidth
      • 6 to 50 M Hz Km
    • Application
      • Short haul communication
      • Limited bandwidth applications
      • Relatively low cost applications

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multi mode graded index
Multi Mode Graded Index
  • Made up of glass or doped silica
  • Higher purity level than MMSI fibers
  • Many different structural profiles developed for different application
  • Structure (Typical)
    • Core diameter: 30 to 100 µm
    • Clad diameter: 100 to 150 µm
    • Buffer jacket diameter: 250 to 1000 µm
    • Numerical Aperture: 0.2 to 0.3

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multi mode graded index6
Multi Mode Graded Index
  • Structural types
    • 50 /125 µm (core-clad) with NA between 0.20 to 0.24 recommended by ITU-T for telecom applications @ 0.85 and 1.3 µm wavelength. Now mainly used for Data Links and LANs
    • 65/124 µm (core-clad) with NA between 0.26 to 0.29 for long distance subscriber loops operating @ 0.85 and 1.3 µm. Now mainly used for LANs
    • 100/125 µm (core-clad)with NA of 0.29. High coupling efficiency with LEDs operating @ 0.85 µm. Used in low cost, short distance applications

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multi mode graded index7
Multi Mode Graded Index
  • Performance characteristics
    • Attenuation
      • Approx 2 to 10 dB/Km @ 0.85 µm wavelength
      • 0.4 dB/Km @ 1.3 µm and 0.25dB/Km @1.55 µm
    • Bandwidth
      • 300 to 3 GHz-Km
    • Application
      • Medium haul communication
      • Medium to high bandwidth applications

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single mode step index
Single Mode Step Index
  • Made up of doped silica
  • Small core diameter
  • Structure
    • Core diameter: 5 to 10 µm
    • Clad diameter: Generally 125µm
    • Buffer jacket diameter: 250 to 1000 µm
    • Numerical Aperture: 0.08 to 0.15 (usually around 0.1)

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single mode step index9
Single Mode Step Index
  • Performance characteristics
    • Attenuation
      • Approx 2 to 5dB/Km @ 0.85 µm wavelength
    • Bandwidth
      • Greater than 500MHzKm
      • Theoretically 40GHzKm @ 0.85 µm
      • Practical bandwidth of 10GHzKM @ 1.3 µm
    • Application
      • Long haul communication
      • Excessive bandwidth applications

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plastic clad fibers
Plastic Clad Fibers
  • Multimode fibers with both step and graded profiles
  • Glass core and plastic clad (often silicon rubber)
  • Lower induced radiation losses (improved performance under certain environments)
  • Slightly cheaper
  • Structure SI GI
    • Core diameter: 100 to 500 50 to 100 µm
    • Clad diameter: 300 to 800 125 to 150 µm
    • Buffer jacket diameter: 500 to 1000 250 to 1000 µm
    • Numerical Aperture: 0.2 to 0.5 0.2 to 0.3

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plastic clad fibers11
Plastic Clad Fibers
  • Performance Characteristics
    • Step Index: 5 to 50 dB/Km
    • Graded index: 4 to 15 dB/Km

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optical fiber cable12
Optical Fiber Cable
  • Why we need cabling
  • Unprotected optical fiber has many disadvantages
    • Poor strength and stability
    • Brittle and small cross sections are susceptible to damage during laying
  • Hence cabling is done to improve
    • Fiber protection
      • Fiber damage and breakage during installation and throughout life

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optical fiber cable13
Optical Fiber Cable
  • Cable strength
    • Should have similar mechanical properties as of electrical cables
    • Increase in resistance to mechanical stress, strain and adverse environmental condition
    • Squeezing and vibrations
  • Identification of joints
  • Stability
    • Reduction of micro bending due to environmental conditions specially temperature
    • Reduction in hydrogen absorption and nuclear radiation exposure

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