November 2017
Intermediate to advanced
937 pages
32h 16m
English
Content preview from Advanced Digital Optical Communications, 2nd Edition
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Annex 4: Power Budget
A4.1 Overview
Power budget is the counterpart of the rise time budget to ensure that the signals entering the reception subsystem has sufficient energy for detection that satisfies a certain criteria for error-free reception. The two scenarios of distinct reception sensitivities of a communication receiver are when FEC is employed or not. If no FEC is employed, then for a Gaussian PDF, the bit error rate (BER) is required to reach 10−9, or the amplitude ratio of the average levels between the “1” and “0” must be at least six times the total standard deviation of the noise levels of the “1” and “0.” With FEC then, this BER can be lowered to about 10−3 or thereabouts, depending on the error coding method.
Thus, the following ...
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