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Introduction
The most important performance parameters for an optical ampliier are: the gain which characterizes the power increase of a signal, the output power which characterizes the ampliier capacity, and the noise igure which characterizes the degradation in signal-to-noise ratio resulting from the ampliier.
An important aspect of testing optical ampliiers is that their performance is dependent on the power of the input signals. The most obvious example of this is that the gain goes into saturation (dropping with increasing signal strength) for high input powers, because the output power reaches its maximum value. Another example is the decrease in broadband background light (ampliied spontaneous emission, ASE) when the energy of the ampliier is depleted through the ampliication of increasingly strong input signals. This effect inluences the noise igure of the device in operation. Thus it is important to characterize ampliiers over the relevant range of input power.
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