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Fiber Cables
Optical fiber cables are transparent, flexible fibers made of glass or plastic that transmit data using light waves. These cables form the backbone of modern high-speed internet, telecommunications, and data center networks due to their superior bandwidth and transmission capabilities.
Structure of a Fiber Optic Cable
A cross-section of a fiber optic cable reveals three essential components:
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Core − The innermost portion through which light propagates. Made of flexible glass with high refractive index, it acts as the optical waveguide. Single-mode fibers have a core diameter of 8-10 ?m, while multimode fibers are 50 ?m in diameter.
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Cladding − Surrounds the core with glass having a lower refractive index. This refractive index difference enables total internal reflection, keeping light waves contained within the core for efficient transmission.
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Outer Jacket − A thin plastic coating that protects the fiber from external light interference and physical damage. Multiple fibers are bundled together under additional protective sheaths.
Types of Optical Fibers
Optical fibers are classified based on their refractive index profile and propagation modes:
By Refractive Index Profile
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Step-index fiber − The core has a constant refractive index with an abrupt change at the core-cladding interface.
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Graded-index fiber − The core's refractive index varies radially from center to edge, being densest at the center and gradually decreasing toward the cladding.
By Propagation Modes
| Type | Core Diameter | Applications | Distance |
|---|---|---|---|
| Single-mode | 8-10 ?m | Long-distance telecom, internet backbone | Up to 100 km+ |
| Multimode | 50-62.5 ?m | Local networks, data centers | Up to 2 km |
Fiber Optic Connectors
Proper connectors ensure minimal light signal loss during fiber connections:
- SC (Subscriber Channel) Connector − Square-shaped, used in cable TV and telecom applications
- ST (Straight-Tip) Connector − Round bayonet-style, common in networking equipment
- LC (Lucent Connector) − Small form factor, widely used in high-density applications
Conclusion
Fiber optic cables transmit data using light through a glass core surrounded by cladding and protective coating. They are classified as single-mode or multimode based on core diameter and propagation characteristics, making them ideal for both long-distance and local network applications.
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