Yao Haomin, Wright Malcolm W, Marciante John R
Appl Opt. 2014 Sep 20;53(27):6155-61. doi: 10.1364/AO.53.006155.
Lasers for use in deep-space applications such as interplanetary optical communications employ multiwatt resonantly pumped dual-clad erbium-doped fiber amplifiers and the pulse-position modulation scheme. Nonlinear optical effects and dynamic gain effects often impair their performance and limit their operational range. These effects are analyzed theoretically and numerically with a time-dependent two-level propagation model, respectively. Self-phase modulation and stimulated Raman scattering are found to limit the usable data format space. In operational regimes free from nonlinear effects, dynamic gain effects such as the variation in the output pulse energy and square-pulse distortion are quantified. Both are found to primarily depend on the symbol duration and can be as large as 28% and 21%, respectively.
用于诸如行星际光通信等深空应用的激光器采用多瓦共振泵浦双包层掺铒光纤放大器和脉冲位置调制方案。非线性光学效应和动态增益效应常常会损害其性能并限制其工作范围。分别用时变二能级传播模型对这些效应进行了理论分析和数值分析。发现自相位调制和受激拉曼散射限制了可用数据格式空间。在无非线性效应的工作状态下，对动态增益效应（如输出脉冲能量变化和方脉冲失真）进行了量化。发现这两者主要取决于符号持续时间，分别可达28%和21%之多。
