【摘要】 相移长周期光栅和变迹长周期光栅作为两种特殊的长周期光纤光栅,由于其特殊的光谱特性,受到了人们的关注。结合长周期莫尔光栅理论,利用紫外逐点写入和两次曝光法,通过灵活地控制两次曝光的周期、起始位置、曝光量等制作参数,在高掺锗载氢光纤上写入了多种长周期莫尔光栅,实现了长周期光纤光栅的相移效应和变迹效应。结果表明,莫尔技术可以被很好地应用于相移长周期光栅和变迹长周期光栅等特殊光栅的制作。更多还原

【Abstract】 Two kinds of special long-period fiber gratings,phase-shift and apodised long-period gratings,were studied by many researchers,because of their special spectral characteristics.According to the theory of long-period moiré gratings,with the methods of step-by-step ultraviolet(UV) writing and double-exposure with different grating period,several kinds of long-period moiré gratings were fabricated in the hydrogened high-germanium-doped fiber by controlling the period and the first position of both exposure and the exposure-time of each step,which realized the effects of phase-shift and apodization.The results indicated that the moiré gratings technology can be well applied in fabricating the special kinds of long-period fiber gratings,such as phase-shifted and apodised gratings.更多还原