Analysis of noise figure spectral distribution in erbium doped fiber amplifiers pumped near 980 and 1480 nm.
A small signal analysis of the noise figure spectral distribution in erbium doped fiber amplifiers pumped near 980 and 1480 nm is presented. In the case where signal-spontaneous beat noise is the dominant cause of signal-to-noise ratio (SNR) degradation, it is shown that noise figures in the +/-0.2-dB range around the 3-dB quantum limit are possible within a spectral band of 50 nm, with the result applying to lambda(p) = 980-nm and lambda(p) = 1460-nm pump wavelengths. For lambda(p) > 1460 nm, a noise figure penalty of 0.5 to 1.2 dB above the quantum limit is found. This study thus demonstrates the possibility of quantum limited or near quantum limited noise regime for amplification of wavelength division multiplexed signals in erbium doped fibers.
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