The effect of optical loss in bent waveguide, change of fiber transverse section and index distribute on transmission of bent long-period fiber grating (LPFG) are discussed in this paper.

• 讨论了长周期光纤光栅弯曲时引起的波导弯曲、光纤截面变形和纤芯折射率分布改变等对其透射特性的影响。