Multiwavelength propagation in lightwave systems with strongly inverted fiber amplifiers
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Abstract
Unlike single-channel systems, which favor saturated operation, multiwavelength erbium-doped fiber amplifier cascades offer substantial performance advantages when operated with minimal saturation at very strong inversion levels. This is due to ground-state absorption which, in partially inverted amplifiers, yields strong wavelength-dependent attenuation and thus large inter-channel power spread. In a strongly inverted six-amplifier chain, the inter-channel power spread per amplifier is suppressed by about an order of magnitude compared with the same system operated well into gain-compression.>