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We propose a method for the real-time measurement of the reflection at both splicing points between a photonic bandgap fiber coil and conventional fiber during the process of fusion splicing in a photonic bandgap fiber optical gyroscope(PBFOG), using the interference among the secondary waves, which arise from the fusion splicing points and the mirror face produced by intentionally cutting the bear end of the coupler. The method is theoretically proven and experimentally verified in a practical PBFOG, and it is significant for inline examination of the fusion splicing quality and evaluation of the PBFOG performance. 相似文献
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光路系统的偏振误差极大地制约着双光程光纤陀螺精度的提高。为了提高新型双光程光纤陀螺的精度,利用相干矩阵和琼斯矩阵对光路中光学器件和熔接点的光学参数进行描述,通过分析顺时针光波与逆时针光波中耦合次波列与主波列间的相干叠加机理,建立了相应的偏振误差模型。利用Matlab以接近于工程实际的参数设置,对光路系统中熔接点、各光学器件缺陷对偏振误差的影响进行了仿真分析,并在此基础上提出了一种可有效抑制双光程光纤陀螺偏振误差的尾纤匹配法。仿真结果表明,通过适当的尾纤长度匹配,双光程光纤陀螺的偏振误差由0.145°/h减小为0.017°/h,其随温度变化的峰谷值也由0.25°/h减小至3×10-4°/h,双光程光纤陀螺的偏振误差得到有效抑制。 相似文献
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为了提高陀螺的精度,提出了一种新型双光程光纤陀螺.在光纤环两端各连接一个偏振分束器,使得偏振光依次沿保偏光纤的快轴、慢轴传输两圈,其有效光程加倍,进而实现陀螺的Sagnac效应加倍.针对该光纤陀螺在温度场扰动下的非互易问题,分析了其特殊结构带来的温度致非互易误差,利用有限元分析法建立了相应的Shupe误差模型,并对光纤环90°熔点位置、光纤环折射率温度系数改变对Shupe误差影响进行了相应的理论计算与仿真分析,结果表明90°熔点置于光纤环中点或者选用折射率温度系数满足特定条件的光纤环可减小其Shupe误差. 相似文献
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光纤陀螺光路小型化技术 总被引:1,自引:5,他引:1
介绍了光纤陀螺基本工作原理,描述了光纤陀螺小型化的意义。分别论述了基于光学器件小型化、光学集成技术、三轴光学器件共用技术实现光纤陀螺光路小型化的技术途径及可能效果,指出了三轴共用探测器技术可能存在的问题。研究成果对促进光纤陀螺的应用、光纤陀螺的实用化具有重要意义。 相似文献
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We investigated the steady state gamma-ray radiation response of pure-silica-core photonic crystal fibers(PSC-PCFs)under an accumulated dose of 500 Gy and a dose rate of 2.38 Gy/min. The radiation-induced attenuation(RIA) spectra in the near-infrared region from 800 nm to 1700 nm were obtained. We find that the RIA at 1550 nm is related with hydroxyl(OH-) absorption defects in addition to the identified self-trapped hole(STH) defects. Moreover, it is proposed and demonstrated that reduced OH-absorption defects can decrease the RIA at 1550 nm. The RIA at 1550 nm has effectively declined from 27.7 d B/km to 3.0 dB/km through fabrication improvement. Preliminary explanations based on the unique fabrication processes were given to interpret the RIA characteristics of PSC-PCFs. The results show that the PSC-PCFs,which offer great advantages over conventional fibers, are promising and applicable to fiber sensors in harsh environments. 相似文献
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