Optical Fiber Communication training

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    Elements in a Fiber Optic Cable

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    • Cable Jacket – Polyethylene: PE (black color) has excellent moisture – and weather-resistance

    properties, used for outdoor. – Polyvinyl Chloride: It is flexible and fire-retardant, used for indoor/outdoor. – Polyvinyl difluoride: PVDF is used for plenum cables because it has better fire-

    retardant properties than PE and produces little smoke. – Low Smoke Zero Halogen: LSZH plastics produce little smoke and no toxic halogen

    compounds. But they are the most expensive jacket material.

    • Aramid Yarn (trade name Kevlar) – Aramid yarn is a yellow color. It is strong and is used to bundle and protect the loose

    tubes or fibers in the cable. When a cable is pulled into a duct, the tension is applied to the aramid yarn instead of the fibers.

    Elements in a Fiber Optic Cable

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    • Central Strength Member – Central strength member made of steel, fiberglass or aramid yarn needed to provide

    the rigidity. • Gel Compound

    – Making the cable impervious to water.

    • Ripcord – Its role is to split the cable easily without harming cable interiors.

    • Dark Fiber – To prevent light that leaks out of one fiber from entering another.

    Basic Fiber Structures

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    • 900um Tight Buffered Fibers – Core (9um for standard single mode fibers, 50um or 62.5um for multimode fibers)

    – Cladding (125um) – Coating (soft plastic, 250um) – Tight buffer (hard plastic, 900um)

    • 250um coated fiber (bare fiber) – Core (9um for standard single mode fibers, 50um or 62.5um for multimode fibers)

    – Cladding (125um) – Coating (soft plastic, 250um is the most popular, sometimes 400um is also used)

    900um Tight Buffered Fiber 250um bare fiber

    Types of Fiber Optics Cable

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    • Tight Buffered Cable – Multiple color coded 900um tight buffered fibers can be packed tightly together in a

    compact cable structure, to connect outside plant cables to terminal equipment. • Elements in a tight buffered fiber optic cable

    – Multiple 900um tight buffered fibers (stranded around the central strength member) – Central strength member (in the center of the cable) – Aramid Yarn (trade name Kevlar, Kevlar was developed by Dupont) (wrapped around

    the fibers, for physical protection and cable