论文部分内容阅读
采用全固型掺镱光子带隙光纤(AS-Yb-PBGF)作增益介质并提供反常群速色散(GVD),设计了一种被动锁模全光纤环形孤子激光器。没有使用任何块状色散补偿元件。因此,该激光器腔型结构简单、紧凑、环境稳定性高,更容易实现全光纤结构。脉冲在激光腔内的传输用广义非线性薛定谔方程描述,并采用分步傅里叶方法数值模拟了该激光器的单孤子运转的动力学过程。计算时,将AS-Yb-PBGF的长度选取为0.4m,改变激光腔内单模光纤(SMF)的长度,得出了最佳运转参数:当AS-Yb-PBGF固定为0.4 m时,选择单模光纤等于0.4 m,就可以实现脉冲宽度为244 fs,脉冲能量为14 pJ和时间带宽乘积为0.32,即接近傅里叶变换极限的单孤子运转。
A fully modeled Ytterbium photonic bandgap fiber (AS-Yb-PBGF) was used as the gain medium to provide anomalous group velocity dispersion (GVD). A passively mode-locked all-fiber toroidal soliton laser was designed. No chromatic dispersion compensating element is used. Therefore, the laser cavity structure is simple, compact, high environmental stability, easier to achieve all-fiber structure. The propagation of the pulse in the laser cavity is described by the generalized nonlinear Schrödinger equation and the kinetic process of the single soliton operation of the laser is numerically simulated by using the fractional Fourier method. When calculating the length of AS-Yb-PBGF as 0.4m, the optimal operating parameters were obtained by changing the length of single-mode fiber (SMF) in the laser cavity. When AS-Yb-PBGF was fixed at 0.4m, With a single-mode fiber equal to 0.4 m, a single-soliton operation with a pulse width of 244 fs, a pulse energy of 14 pJ and a time-bandwidth product of 0.32, which is close to the Fourier transform limit, can be realized.