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Article Overview

Multimode fiber optic cables are classified into five main types: OM1, OM2, OM3, OM4, and OM5, each with distinct specifications and applications.

Overview of Multimode Fiber Types

  1. OM1:

    • Core Size: 62.5 µm
    • Maximum Distance: Up to 33 meters for 10 Gigabit Ethernet; typically used for 100 Megabit Ethernet applications.
    • Jacket Color: Orange
    • Light Source: LED
    • Bandwidth: 200 MHz·km

  2. OM2:

    • Core Size: 50 µm
    • Maximum Distance: Up to 82 meters for 10 Gigabit Ethernet; commonly used for 1 Gigabit Ethernet applications.
    • Jacket Color: Orange
    • Light Source: LED
    • Bandwidth: 500 MHz·km

  3. OM3:

    • Core Size: 50 µm
    • Maximum Distance: Up to 300 meters for 10 Gigabit Ethernet; supports 40 Gigabit and 100 Gigabit Ethernet up to 100 meters.
    • Jacket Color: Aqua
    • Light Source: Laser-optimized (VCSEL)
    • Bandwidth: 2000 MHz·km

  4. OM4:

    • Core Size: 50 µm
    • Maximum Distance: Up to 550 meters for 10 Gigabit Ethernet; optimized for laser transmission.
    • Jacket Color: Aqua
    • Light Source: Laser-optimized (VCSEL)
    • Bandwidth: 4700 MHz·km

  5. OM5:

    • Core Size: 50 µm
    • Maximum Distance: Similar to OM4 but designed for shortwave wavelength division multiplexing (SWDM) applications.
    • Jacket Color: Lime Green
    • Light Source: Laser-optimized (VCSEL)
    • Bandwidth: 4000 MHz·km

Applications and Considerations

  • Short-Distance Communication: Multimode fibers are primarily used for short-distance communication, such as within buildings or campuses, due to their larger core size which allows multiple light modes to propagate simultaneously.
  • Data Centers and Networking: OM3 and OM4 are commonly used in data centers for high-speed applications, while OM1 and OM2 are often found in older installations.
  • Cost-Effectiveness: Multimode fibers typically use lower-cost electronics (LEDs and VCSELs), making them a more economical choice for short-range applications compared to single-mode fibers.

Understanding the differences between these multimode fiber types can help in selecting the right cable for specific networking needs and applications .

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What type of fiber optic cable is multimode fiber
What type of fiber optic cable is multimode fiber [PDF]

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