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为研究双折射光纤的高功率环形腔光纤激光系统输出稳定性,提出了一种可能存在的矢量调制不稳定现象——边带偏振不稳定性(SPI)。结合偏振不稳定性与边带不稳定性的研究方法,建立了偏振光在线性双折射掺杂光纤的环形腔中传输时满足的非线性薛定谔方程,并求得了高双折射光纤中信号光偏振方向与主轴重合时扰动边带的解析解。研究结果表明,在正常色散情况下,沿主轴偏振的信号光在环形激光器中传输时,各阶扰动边带所获得的峰值增益随着信号光功率的变化而呈锯齿状分布,并随功率的增加而趋于一稳定值。
In order to study the output stability of high power annular cavity fiber laser system with birefringent fiber, a possible phenomenon of vector modulation instability (SPI) is proposed. A nonlinear Schrödinger equation for the transmission of polarized light in a circular cavity of a linear birefringent doping fiber was established by combining the research on polarization instability and sideband instability. The polarization of signal light in a high birefringence fiber Analytical Solutions of Disturbing Sidebands in Direction and Spindle. The results show that under the normal dispersion condition, when the signal light polarized along the main axis is transmitted in the ring laser, the peak gains obtained by the perturbed sidebands are distributed in a zigzag pattern according to the signal light power, Increase tends to a stable value.