基于双层孔结构的850nm超细径保偏光子晶体光纤

Ultra-Fine Diameter Polarization-Maintaining Photonic Crystal Fiber Based on Double-Layer Air Hole at 850nm Wavelength

光子晶体光纤由高纯度石英玻璃制备而成,具备弯曲损耗小、环境适应性强等优点,尤其适用于恶劣应用环境下的高稳定光纤陀螺。传统光子晶体光纤内部微孔占据了较大的空间,导致光纤直径大,并且主要工作波段为1550nm,无法满足小型化、高精度光纤陀螺需求。提出了双层空气孔结构缩小光纤直径,通过微孔尺寸调节降低光纤损耗,并使光纤限制损耗具有偏振相关性,从而实现超细径保偏光子晶体光纤设计。采用“堆积拉制”法制备了Φ60/100μm光子晶体光纤样品,经截断法测试光纤损耗为6.5dB/km@850nm,偏振串音-15dB@100m。

Photonic crystal optical fiber is made of high-purity quartz glass,which offers the advantages of low bending loss and robust environmental adaptability.It is particularly well-suited for high-stability optical fiber gyroscopes in demanding application environments.The internal micropores of traditional photonic crystal fibers occupy a significant amount of space,leading to a large fiber diameter.The primary operating band is 1550nm,which does not meet the demands for miniaturization and high precision in fiber gyroscopes.This paper proposes a double-layer air hole structure to reduce the diameter of the optical fiber,minimize optical fiber loss,and control polarization correlation.A sample ofΦ60/100μm photonic crystal fiber was prepared using the“stacking-pull”method.The fiber loss was measured at 6.5dB/km@850nm,and the polarization crosstalk was-15dB@100m.