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Questions and Answers
Why are fibers used instead of metal wires in fiber-optic communications?
Why are fibers used instead of metal wires in fiber-optic communications?
- Fibers can carry light into confined spaces
- Fibers are cheaper to produce than metal wires
- Signals travel along fibers with less loss and are immune to electromagnetic interference (correct)
- Fibers have a higher index of refraction than metal wires
How are glass optical fibers typically made?
How are glass optical fibers typically made?
- By casting
- By extrusion
- By molding
- By drawing (correct)
What causes the fiber to act as a waveguide?
What causes the fiber to act as a waveguide?
- Total internal reflection (correct)
- External electromagnetic interference
- Propagation paths
- Transverse modes
What are fibers that support many propagation paths or transverse modes called?
What are fibers that support many propagation paths or transverse modes called?
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In what way do optical fibers permit transmission over longer distances and at higher bandwidths than electrical cables?
In what way do optical fibers permit transmission over longer distances and at higher bandwidths than electrical cables?
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Study Notes
Fiber-Optic Communications
- Fibers are used instead of metal wires because they offer higher bandwidth, lower attenuation, and greater immunity to electromagnetic interference.
Fabrication of Glass Optical Fibers
- Glass optical fibers are typically made by heating and stretching a preform, which is a large, cylindrical piece of glass, until it reaches the desired fiber diameter.
Waveguide Properties
- The fiber acts as a waveguide because the refractive index of the core is higher than that of the cladding, causing total internal reflection of light at the boundary.
Multimode Fibers
- Fibers that support many propagation paths or transverse modes are called multimode fibers.
Advantages of Optical Fibers
- Optical fibers permit transmission over longer distances and at higher bandwidths than electrical cables because light signals travel at much higher speeds than electric signals, and are less susceptible to signal degradation.
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