【摘要】 利用谐振理论对啁啾光纤光栅时延纹波和反射谱边瓣的形成原因进行了分析,研究了单侧曝光切趾方式中引入的非常数直流折射率调制分量对啁啾光栅特性的影响,阐明了切趾技术提高啁啾光纤光栅性能的作用机理,提出了一种能够使啁啾光纤光栅获得优化性能的切趾方法,该方法只需对光栅进行单侧曝光,实现简单.更多还原

【Abstract】 The generation of group delay ripple and reflection sideband is explained by the oscillazation theory.And the effect of non-constant change of averaged index modulation induced by the one-side exposure apodization on the characteristics of chirped gratings is analyzed for the first time.The mechanism of apodization to enhance the performance of chirped fiber Bragg gratings is studied also.Based on the study,a simple apodization method to improve the performance of chirped fiber gratings is proposed,in which only one-sided exposure is needed which is easy to realize.更多还原