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Erschienen in:
Fiber Optic Communications: A Review Kapitel lesen Erstes Kapitel lesen

2009 | OriginalPaper | Buchkapitel

3. Signal Characterization and Representation

verfasst von : Mohammad Azadeh

Erschienen in: Fiber Optics Engineering

Verlag: Springer US

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Abstract

Fiber optic systems utilize the wide bandwidth of the fiber to transfer very high data rates over long distances. As noted in Chapter 1, in order to represent information, a physical quantity must be modulated. A “signal” is the representation of information, and a physical signal is realized when a voltage, a current, or an electromagnetic wave is modulated. In fiber optics, we deal with electrical and optical signals. At the level of physical layer, a fiber optic link converts an electrical signal to an optical signal, transmits it over the fiber, and converts it back to an electrical signal at the other side.

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Vorheriges Kapitel Communication Networks
Nächstes Kapitel Semiconductor Lasers
Fußnoten
1
Notice that the overall bandwidth requirement is twice that of the sum of each signal’s bandwidth, as each baseband signal yields two sidebands after frequency shifting. Single side band modulation can improve bandwidth efficiency by transmitting only one sideband for each signal.
 
2
This assertion holds for almost all practical fiber optic systems. Although it is possible to use the phase or frequency of light to encode information, almost all practical fiber optic systems modulate the amplitude of light and therefore can be considered AM modulation schemes.
 
3
A relationship commonly given in literature is BW=0.35/τ. This equation is derived based on the 3 dB bandwidth of a single pole RC-type network. Also, τ is defined based on 10–90% levels. However, in optical signal 20 and 80% levels are more commonly used, and the waveforms are more triangular like than exponential.
 
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Metadaten
Titel
Signal Characterization and Representation
verfasst von
Mohammad Azadeh
Copyright-Jahr
2009
Verlag
Springer US
Buch
Fiber Optics Engineering

Print ISBN: 978-1-4419-0303-7

Electronic ISBN: 978-1-4419-0304-4

Copyright-Jahr: 2009

DOI
https://doi.org/10.1007/978-1-4419-0304-4_3

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