Desurvire E
Appl Opt. 1990 Jul 20;29(21):3118-25. doi: 10.1364/AO.29.003118.
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.
本文对在980nm和1480nm附近泵浦的掺铒光纤放大器中的噪声系数频谱分布进行了小信号分析。在信号 - 自发拍频噪声是信噪比（SNR）下降的主要原因的情况下，研究表明，在50nm的光谱带宽内，有可能在3dB量子极限附近±0.2dB的范围内实现噪声系数，该结果适用于λ(p)=980nm和λ(p)=1460nm的泵浦波长。对于λ(p)>1460nm，发现噪声系数比量子极限高出0.5至1.2dB。因此，本研究证明了在掺铒光纤中放大波分复用信号时实现量子极限或接近量子极限噪声状态的可能性。
