单偏振双芯光子带隙光纤定向耦合器

发布时间：2018-02-26 12:57

本文关键词： 光纤光学光子带隙光纤单偏振定向耦合器谐振式光纤陀螺热致偏振串扰　出处：《中国激光》2016年09期 　论文类型：期刊论文

【摘要】：提出了一种基于双芯光子带隙光纤(PBF)的单偏振(SP)定向耦合器,利用全矢量有限元方法(FEM)对其耦合特性进行了研究。结果表明:通过适当调整纤芯间微孔的大小及掺杂折射率可在耦合器获得SP特性;而纤芯间微孔椭圆率的变化并不会对其SP特性造成干扰,耦合器具有较高的结构参数容错性;通过优化参数,最终获得了一种长度仅为0.403mm的SP定向耦合器。该耦合器在全保偏PBF(PM-PBF)谐振腔应用中,能同时起到分束器及起偏器的作用,可以破坏次本征偏振态(ESOP)的谐振条件,有效抑制次ESOP的传输。这种具有较短长度的SP定向耦合器模场可与之前提出的PM-PBF的模场相匹配,有利于搭建起全PM-PBF谐振腔,这对抑制谐振式光纤陀螺(RFOG)热致偏振串扰噪声、提高RFOG的长期稳定性具有重要意义。
[Abstract]:A single polarization SPD directional coupler based on two core photonic band gap fiber (PBF) is proposed. The coupling characteristics of the coupler are studied by using full vector finite element method (FEMM). The results show that SP characteristics can be obtained by properly adjusting the size of the micropores between the cores and the doped refractive index in the coupler. However, the variation of the micropore ellipticity between the cores does not interfere with the SP characteristics, and the coupler has higher fault tolerance of structural parameters. Finally, a SP directional coupler with a length of only 0.403mm is obtained. The coupler can act as a beam splitter and a polarizer in the application of a fully polarization-maintaining PBFM-PBF resonator, and can destroy the resonant condition of the sub-intrinsic polarization state ESOP. The mode field of SP directional coupler with short length can match the mode field of PM-PBF proposed before, which is beneficial to the construction of full PM-PBF resonator, which can suppress the thermal polarization crosstalk noise of resonator fiber optic gyroscope (RFOG). It is of great significance to improve the long-term stability of RFOG.
【作者单位】：哈尔滨工程大学自动化学院;东北电力大学自动化工程学院;
【基金】：国家自然科学基金(61503073) 吉林省青年科学基金(20130522171JH) 吉林市科技发展计划资助项目(20156404) 东北电力大学博士科研启动基金资助课题(BSJXM-201419)
【分类号】：TN622

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