What are optical fibers? Composed optic cables? How many types of optical cables ?.

11:29 | 07/05/2015
Is defined as the environment for Internet-based signal transmission lines are made of fiber-optic cable. Like electric transmission cables, voice communication using the telephone cable. And fiber optic signal transmission medium is optical (light).
What are optical fibers? Composed optic cables? How many types of optical cables ?.

What are optical fibers? Composed optic cables? How many types of optical cables ?.

How many types of optical cables ?.

1. What is Optical Cable?

Is defined as the environment for Internet-based signal transmission lines are made ​​of fiber-optic cable. Like electric transmission cables, voice communication using the telephone cable. Environmental and optical cable is signaling optical (light).

Optical Cable unlike copper cable (using electricity to transmit signals) optical cable less prone to interference, high speed data transfer and a lot farther.

2. What is optic cables?

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Optical Cables - illustration

Optical Cable is one of the cables used in the telecommunications industry, is made ​​of glass or plastic, used to transmit light signals. They are arranged in bundles together, the cable capable of transmitting optical signals travel great distances.

3. Composition optic cables?

3 main parts:

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Optical Cable Structure

  • Core (core): Made of fiberglass or plastic-to transmit light signals
  • Cladding: the core layer covered with protective functions and reflexes to push back the light guide core
  • Protective shell:
    • Primary Coating: the plastic outer shell and core ladding protect VEC from dust, moisture and trayxuoc
    • Strength Member: is grade heat and traction is made ​​of Kevlar
    • Bufer: The PVC layer protection from bumps, moisture.
    • Jacket: the outer protective layer resistant to impact, abrasion, heat and humidity and the environmental impact.

4. Classification optic cables:

Separate cables according Core material:

- POF (Plastic Optical Fiber): Core made ​​of plastic fibers, used for signal transmission distance is short, low-speed network, this kind now rarely used

- GOF (Glass Optical Fiber): Core made ​​of fiberglass fast transmission speed and low attenuation.

Classification optic cables transmit data by mode:

♦ Singlemode: use cables with small core (9 micron) and using light sources of laser development throughout should signal attenuation and less speed and distance data transmission go very far.

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Mode of transmission Singlemode

Multimode: use cables with larger core diameter singlemode (from 50 microns to 62.5μm). Using LED or laser source for transmitting light, the data transmission speed and distance singlemode lower transmission distance is ≤ 5 km limit is often used for businesses, offices , factories , hotels large. Multimode transmission type 2 are:

Step Index Multimode: The light propagating in different directions so high attenuation levels and relatively slow speed. Step less common index, often used for optical fiber POF (Plastic Optical Fiber)

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Step Index Multimode transmission methods

Multimode graded Index: The light transmission curve and converge at a point. Therefore graded index less attenuation and high transmission speeds and is used more commonly.

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Multimode transmission methods, graded Index

Classification of optical cable design:

buffer pipes loose (Loose Tube): outdoor use (outdoor), allowing multiple optical fibers contained within. Help fiber optic cable "expansion" before the temperature changes, natural elasticity, no tension, bend in the curve.

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Loose wires Tube

ng Uh packing (Tight Buffer): used in the (indoor), wrapped snugly optical fiber (such as cables), easy installation help for construction

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Tight Buffer wires

5. Application:

Fiber optic applications in telecom sector: internet to transmit signals thousands of kilometers away.

Applications in the CCTV: Installation of signal transmission IP camera or analog camera away from 1-20km optic cable

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