September 2002
Intermediate to advanced
551 pages
21h 45m
English
Content preview from Undersea Fiber Communication Systems
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Fourier transform. Disregarding the first term, which corresponds to the squared
mean power, the second one gives the power spectrum of the power fluctuations:
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This relation can be found directly by using a heuristic approach: The spectral
spread of power is twice that of the noise since squaring ‘‘doubles’’ the frequency,
a linear frequency decay is mandatory, and the integration of the spectrum has to
produce the mean square of the power fluctuations [26]. The photodetector with
responsivity R converts these fluctuations into current fluctuations with a low-
pass filtering over the electrical bandwidth ...
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