The results of numerical simulation of the ultimate spectral efficiency of information transfer by erbium-doped fiber amplifiers in the S and C bands in the regime of unsaturated gain are presented. The cases of co-and counterpropagating pumps are analyzed in terms of the three-level and quasi-two-level schemes. It is shown that, for the peak gain in the range 12-24 dB and a signal-to-noise ratio at the entrance equal to 20 dB, the ultimate efficiency lies in the range 5.5-7.5 bit s(-1) Hz(-1) for the S band and 5.6-7.2 bit s(-1) Hz(-1) for the C band.
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机译：给出了在不饱和增益状态下在S和C波段掺光纤放大器进行信息传递的最终频谱效率的数值模拟结果。根据三级和准二级方案分析了同向泵和反向传播泵的情况。结果表明，对于12-24 dB范围内的峰值增益和入口处的信噪比等于20 dB，最终效率位于5.5-7.5 bit s（-1）Hz（ -1）适用于S频段，而5.6-7.2位s（-1）Hz（-1）适用于C频段。
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