提出了一种基于双芯光子晶体光纤(PCF)的具有短长度和超高消光比的偏振分束器,利用全矢量有限元法(FEM)对双芯PCF的耦合特性和偏振分束器的性能进行了数值研究。研究结果表明:增大纤芯间椭圆孔椭圆率、适当提高掺杂折射率可显著降低双芯...提出了一种基于双芯光子晶体光纤(PCF)的具有短长度和超高消光比的偏振分束器,利用全矢量有限元法(FEM)对双芯PCF的耦合特性和偏振分束器的性能进行了数值研究。研究结果表明:增大纤芯间椭圆孔椭圆率、适当提高掺杂折射率可显著降低双芯PCF的耦合长度;基于该双芯PCF设计的偏振分束器在1.55 mm波长处,长度为0.58 mm时,可以实现x,y偏振态的分离,消光比达到82.33 d B,消光比高于20 d B的带宽为70 nm,高于10 d B的带宽达到110 nm,覆盖了C+L波段。这为设计具有短长度、高消光比、宽带特性的PCF偏振分束器提供了一种新的结构。展开更多
By studying the thermal-induced phase shift mechanism of an interferometric fiber-optic gyroscope （IFOG） sensing coil, a novel generalized expression based on a three-dimensional （3D） model is proposed. Compared w...By studying the thermal-induced phase shift mechanism of an interferometric fiber-optic gyroscope （IFOG） sensing coil, a novel generalized expression based on a three-dimensional （3D） model is proposed. Compared with the traditional pure Shupe effect model, the simulation results show that the new 3D model, including elastic strain and the elasto-optical effect, can describe the thermal effect of the coils more accurately. Experiments with temperature change rates between -40℃ and 70℃ are performed to verify the effectiveness of the proposed generalized expression. The results of our work can guide researchers in identifying countermeasures to reduce the thermal-induced bias error in IFOG.展开更多
文摘提出了一种基于双芯光子晶体光纤(PCF)的具有短长度和超高消光比的偏振分束器,利用全矢量有限元法(FEM)对双芯PCF的耦合特性和偏振分束器的性能进行了数值研究。研究结果表明:增大纤芯间椭圆孔椭圆率、适当提高掺杂折射率可显著降低双芯PCF的耦合长度;基于该双芯PCF设计的偏振分束器在1.55 mm波长处,长度为0.58 mm时,可以实现x,y偏振态的分离,消光比达到82.33 d B,消光比高于20 d B的带宽为70 nm,高于10 d B的带宽达到110 nm,覆盖了C+L波段。这为设计具有短长度、高消光比、宽带特性的PCF偏振分束器提供了一种新的结构。
基金supported by the National Natural Science Foundation of China(No.51205074)the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20112304120007)the Harbin Specialized Research Foundation for Innovation Talents(No.RC2012QN009037)
文摘By studying the thermal-induced phase shift mechanism of an interferometric fiber-optic gyroscope （IFOG） sensing coil, a novel generalized expression based on a three-dimensional （3D） model is proposed. Compared with the traditional pure Shupe effect model, the simulation results show that the new 3D model, including elastic strain and the elasto-optical effect, can describe the thermal effect of the coils more accurately. Experiments with temperature change rates between -40℃ and 70℃ are performed to verify the effectiveness of the proposed generalized expression. The results of our work can guide researchers in identifying countermeasures to reduce the thermal-induced bias error in IFOG.
