Hollow-core photonic bandgap fibers (HC PBFs) are suitable for spaceborne fiber optical gyroscopes owing to their excellent environmental adaptability. However, hundreds of small holes full of air at one atmosphere of pressure can make the HC-PBF sensitive to external atmospheric pressure. In this study, we investigated the phase sensitivity of the fundamental mode to external atmospheric pressure for the HC PBF, and the experimental result indicates that the phase sensitivity is approximately 1.6 x 10(-5) ppm/Pa, which is mostly contributed by the change in the pressure-induced length. Through the choice of coating, the phase sensitivity to external atmospheric pressure can be reduced by about a factor of five compared to current HC PBFs, and the excellent temperature performance can be maintained at the same time.
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机译：中空光子带隙光纤（HC PBF）具有出色的环境适应性，因此它们适合于空间光纤陀螺仪。但是，在一个大气压下充满空气的数百个小孔会使HC-PBF对外部大气压敏感。在这项研究中，我们研究了HC PBF的基本模式对外部大气压力的相位灵敏度，实验结果表明，相位灵敏度约为1.6 x 10（-5）ppm / Pa，这主要是由于压力引起的长度变化。通过选择涂层，与当前的HC PBF相比，对外部大气压力的相位敏感性可以降低大约五分之一，并且可以同时保持出色的温度性能。
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