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提出了一种具有良好保偏(PM)特性的空芯带隙光子晶体光纤(PBF)结构,利用全矢量有限元方法(FEM)对光纤有效折射率、拍长及限制损耗特性受温度波动的影响进行了研究。研究结果表明,在1.55μm波长处,该PBF的双折射高达6.19×10-3,拍长不超过0.25 mm;PBF拍长对温度波动不敏感,拍长温度敏感系数低于2.86×10-8m/℃,比常规的熊猫保偏光纤低两个数量级;光纤损耗对温度波动较为敏感,两正交偏振态限制损耗会随温度提高而增大。这种具有极低拍长温度敏感系数的PM-PBF可以有效降低谐振式光纤陀螺(RFOG)中热致偏振不稳定带来的误差,在RFOG、光纤通讯、光纤传感等领域具有重要的应用价值。
A hollow core bandgap photonic crystal fiber (PBF) structure with good polarization maintaining (PM) property was proposed. The full-vector finite element method (FEM) was used to measure the effective refractive index, the beat length and the limiting loss characteristic of the fiber under temperature fluctuation The impact was studied. The results show that the birefringence of PBF is as high as 6.19 × 10-3 at the wavelength of 1.55μm, and the beat length is no more than 0.25 mm. The beat length of PBF is not sensitive to temperature fluctuations, and the temperature sensitivity coefficient of beat length is less than 2.86 × 10-8m / ℃, which is two orders of magnitude lower than that of the conventional Polaroid polarization maintaining fiber. Optical fiber loss is more sensitive to temperature fluctuations, and the limiting loss of the two orthogonal polarization states increases with increasing temperature. The PM-PBF with very low temperature coefficient of beat sensitivity can effectively reduce the error caused by thermal polarization instability in the resonant fiber optic gyroscope (RFOG) and has important applications in the fields of RFOG, optical fiber communication and optical fiber sensing value.