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空芯光子晶体光纤由于独特的结构,具有不同于传统光纤在弯曲状态下的光传输特性。对空芯带隙型光子晶体光纤的微观弯曲损耗特性进行研究,利用改进型微弯器使光纤获得不同外力和弯曲条件下的响应,测量其传输谱。实验上分析了波长、压力、微弯振幅和微弯周期等因素对于光纤传输损耗的影响,利用模式理论分析给出了微弯损耗产生的原因。结果表明,带隙型光子晶体光纤的抗微弯能力强,由于表面模式的存在,在1520～1620nm波段内光纤微弯损耗随波长的增加而增大。带隙型光子晶体光纤的弯曲损耗随微弯振幅增大而增大,并且在一定范围内损耗随微弯空间周期的增加而增大,但当微弯周期超过一定的临界值时其损耗随之减小;微弯状态下光纤的表面模式、包层模式与损耗密切相关。
Due to its unique structure, hollow-core photonic crystal fibers have different optical transmission characteristics from those of conventional optical fibers in a bent state. The microscopic bending loss characteristics of hollow core bandgap photonic crystal fiber were studied. The improved microbendifier was used to obtain the response under different external forces and bending conditions. The transmission spectrum was measured. The influences of wavelength, pressure, micro-bending amplitude and micro-bending period on transmission loss of fiber are experimentally analyzed. The causes of micro-bending loss are given by using the theoretical analysis of the model. The results show that the bandgap photonic crystal fiber possesses strong anti-microbendability. Due to the surface mode, the microbending loss of fiber increases with the increase of wavelength in the band of 1520 ~ 1620nm. The bending loss of the bandgap photonic crystal fiber increases with the increase of the microbend amplitude, and the loss increases with the increase of the microbending space period within a certain range, but the loss decreases with the increase of the microbending period beyond a certain critical value The surface mode and the cladding mode of the fiber are closely related to the loss.