It220- Assignment 9

In: Computers and Technology

Submitted By darwisin1025
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Assignment 9.1:
Chapter 12
1. List five advantages of an optical communications link.
• Enormous Bandwidths
• Low transmission loss
• Immunity to cross talk
• Electrical Isolation
• Small size and weight
2. Define refractive index
• Ratio of the speed of light in free space to its speed in a given material.
3. What are the commonly used wavelengths in fiber optic systems?
• Dense Wavelength division Multiplexing.
4. What are the typical core/cladding sizes (in microns) for multimode fiber?
• The two types of fiber are multimode and single mode. Within these categories, fibers are identified by their core and cladding diameters expressed in microns (one millionth of a meter), e.g. 50/125 micron multimode fiber.
• Most fibers are 125 microns in outside diameter - a micron is one one-millionth of a meter and 125 microns is 0.005 inches- a bit larger than the typical human hair.
5. Define mode field diameter.
• The Diameter base protocol is intended to provide an Authentication, Authorization and Accounting (AAA) framework for applications such as network access or IP mobility.
6. What are the four factors that contribute to attenuation?
• Scattering
• Absorption
• Macrobending
• Microbending
7. What are the three types of dispersion?
• Modal dispersion
• Chromatic dispersion
• Polarization mode dispersion
8. What is a dispersion compensating fiber?
• A fiber that acts like an equalizer, negative dispersion canceling positive dispersion.
9. What is a narrower spectra advantageous in optical systems?
• The light output wavelength spread, or spectrum, of the DL is much narrower than that of LEDs. About 1nm compared with about 40nm for an LED.
10. What is the purpose of an optical attenuator?
• Variable attenuators are typically for temporary use in calibration, testing, and laboratory work but more recently are being used in optical…...

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