光栅参数对折射率剖面非均匀取样光纤光栅的影响

利用传输矩阵法，数值分析了光栅参数对折射率剖面非均匀的均匀光纤光栅及取样光纤光栅的透射谱、偏振关系损耗和偏振模色散的影响。计算结果表明，均匀光纤光栅的光栅条纹可见度及光栅周期对其偏振关系损耗和偏振模色散影响很大；改变取样光纤光栅的取样周期及光栅段长度，透射谐振峰的幅度、偏振关系损耗和偏振模色散的最大值均随取样光纤光栅长度的增加而递增。与靠近中心波长的谐振峰相比，折射率剖面非均匀导致的双折射对取样光纤光栅远离中心波长的谐振峰的影响较小。

Influence of the grating parameters on the sampled fiber grating with an asymmetric refractive index profile

Using the transfer matrix method,the influence of the grating parameters on the transmission,polarization dependent loss and polarization-mode dispersion are stimulated for the uniform fiber grating and sampled fiber grating with the asymmetric refractive index profiles.For the uniform fiber grating,the results show that the fringe visibility and the period have obvious impact on the polarization dependent loss and polarization-mode dispersion.For the sampled fiber grating,the maximums of the amplitude,polarization dependent loss and polarization-mode dispersion of all the resonance peaks increase with the increasing of the grating length,no matter what the length of the uniform fiber grating segment and the period of the sampled fiber grating are chosen.The birefringence induced by the asymmetric refractive index has stronger impact on the resonance peak close to the central wavelength than that of far away form the central wavelength.