Abstract
In this paper we compare two approaches for electronic gain equalization of erbium-doped fiber amplifier (EDFA) chains. The two strategies are compared quantitatively by considering laser dynamic range, received signal power and signal-to-noise ratio (SNR), and four-wave mixing crosstalk in order to calculate the maximum transmission distance allowed by each scheme. Relative performance is shown as a function of the number of amplifiers and the number of channels. We also consider technical advantages of implementing the two equalization schemes. It is shown that the individual equalization scheme results in a 150 km-200 km increase in transmission distance relative to the end/end equalization scheme at the expense of a more complex and expensive implementation. The results provide insight into the relative merits of end/end versus individual electronic equalization strategies.
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