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Introduction to Optical Transmission in a Communications Network

Table of Contents:
Definition and Overview
1. History of Transmission
2. Why Optical Transmission?
3. Transmission Signal Parameters
4. Types of Transmission Networks
5. Overview of Multiplexing
6. WDM and TDM
7. Types of Network Elements
Self-Test
Glossary
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Self-Test
1. _____________ prevents light from escaping in a fiber.
a. inner tube
b. cladding
2. A transmission signal has ___________ components.
a. one
b. two
c. three
d. four
3. Metro means _____________ distances between nodes.
a. short
b. long
4. The best way to put more than one telephone call on each link is to multiplex the calls.
a. true
b. false
5. Transmission systems that are designed according to North American rules work with groups of _________________ calls.
a. 24
b. 26
c. 30
d. 32
6. With WDM, traffic in each lane must travel at the same speed.
a. true
b. false
7. _______________ is there to generate the fastest bit stream possible or economical in a part of the network.
a. TDM
b. WDM
8. _______________ manipulates bit streams while _______________ manipulates wavelengths.
a. WDM; TDM
b. TDM; WDM
9. With distance, pulses get smaller, as a result of ______________.
a. dispersion
b. attenuation
10. Longer distances can be achieved with ______________ than with ________________.
a. direct modulation; external modulation
b. external modulation; direct modulation
Glossary >>

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