偏振控制锁模光谱边带偏移量的计算及实验验证

Calculation and Experiment of Spectral Sideband Offset in Ring Cavity Fiber Laser by Nonlinear Polarization Rotation

通过对光纤中传输的孤子波演化及其色散波相互作用的动力学方程分析,详细推导了环形腔非线性偏振旋转(NPR)锁模光纤激光器中色散波与孤子波相互干涉而产生的脉冲光谱边带偏移量的理论计算公式。并将各级边带波长与脉冲中心波长的偏移量理论值与相应的实验测量值进行了对比,理论值与实验值符合得非常好,其最大误差在4.1%以下。从而解释了在偏振控制被动锁模条件下,环形腔光纤激光器光谱边带产生的原因。

The dynamic equations which describe the pulse nonlinear polarization rotation （NPR） of nonlinear birefringence in ring cavity fiber laser were given. The theoretical formulae of spectrum sideband offset which stems from the interference between the dispersion wave and the soliton wave are deduced in ring cavity fiber laser passively mode-locked by the nonlinear polarization rotation technique. Theoretical spectral sideband offsets are consistent with experimental results very well in the paper. And the maximal error is less than 4.1 %, which explains the sideband offset in ring cavity fiber laser under passive mode-locking by NPR.