Abstract
We investigate modulation instability (MI) in the presence of a monochromatic spectrum and on the background of a broadband amplified spontaneous emission spectrum induced by an erbium-doped fiber amplifier, respectively. For the former case, the MI threshold is ∼110 mW, which agrees well with the theoretical value. However, for the latter case, the threshold is as high as ∼170 mW, which indicates that the MI threshold depends on the shape of the input spectrum and that the broadband spectrum has a higher threshold than the monochromatic one.
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