光孤子放大过程中的动态增益

分别用逆散射微扰方法和傅里叶变换求系综平均观点详细分析了在光孤子放大过程中，如果设法使放大器增益随孤子频率变化而变化，在一定条件下，既可大大减弱光孤子脉冲的喇曼自泵效应引起的自频移现象，又可有效地控制放大过程中产生的自发辐射噪声（ＡＳＥ）．结果表明，在两种特性的动态增益中，可有效地控制ＡＳＥ噪声从而突破Ｇｏｒｄｏｎ－Ｈａｕｓ限制，也可使自频移明显减弱，并与计算机数值研究结果作了比较。 关键词：

DYNAMIC GAIN IN THE AMPLIFICATION OF OPTICAL SOLITON

The self-frequency shift (SFS) resulting from Raman self-pumping effect of optical soliton and amplifer spontanious emission (ASE) noise produced in the amplification of optical soliton can both be reduced significantly by making amplifer gain depend on soliton frequency. In this paper, the above two schemes are investigated analytically and numerically by using pertubation method of inverse scattering theory and the concept of fouier transform an ensemble average. The result shows that the two schemes are effective in controlling ASE noise hence the limitation of G-H effect can be weakened obviously. The comparison with results of computer similation is made.