Mutual signal gain saturation in Er 3+ -doped fibre amplifier around 1.54 μm wavelength

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Abstract
Signal gain saturation characteristics of a 1.48 μm wavelength LD pumped Er3+-doped fibre amplifier are experimentally investigated for two signal channels amplifiedaround the gain peak wavelengths of 1.535 μm and 1.551 μm. The degree of gain saturation is uniquely determined by thetotal output power when the signal wavelengths are closely positioned. This feature is not suited to two-channel amplification for widely spaced wavelengths.