共查询到19条相似文献,搜索用时 78 毫秒
1.
一种基于偏振态检测技术的单模光纤应力双折射测量法 总被引:1,自引:1,他引:1
针对光纤应力双折射理论与实际应用存在的差异,提出了一种简单而实用的基于偏振态检测技术的光纤应力双折射测量的方案,并用实验结果证明了其有效性. 相似文献
2.
光纤几何路径引起的圆双折射 总被引:1,自引:1,他引:0
本文对单模光纤中线偏振面的旋转与光纤几何路径的关系进行了研究.首次报道了在光纤入射端和出射端不平行的情况下的数值计算和实验测量结果. 相似文献
3.
4.
金属包层单模光纤偏振器的分析 总被引:1,自引:0,他引:1
给出计算金属包层单模光纤偏振器中两种正交偏振模式的损耗系数,偏振器的消光比与插入损耗的微扰分析方法。本法计算较简便,且能分析光纤芯区被部分刻蚀的情况,此情况的分析尚未报道。其计算结果与实验结果符合。 相似文献
5.
基于双折射效应的普通单模光纤频率偏移器和偏振控制器 总被引:1,自引:0,他引:1
本文介绍了利用普通单模光导纤维弯曲产生的双折射效应而研制成的频率偏移装置和偏振控制装置.频率偏移装置的单边带抑制达30dB以上,它与光纤偏振控制装置一起是构成全光纤功能型传感器比较理想的光纤元件. 相似文献
6.
利用全矢量有限元方法,对椭圆六角对称分布微结构光纤(MF)的双折射特性进行了理论分析,得到了双折射大小与结构参量、入射波长间的依赖关系。分析表明:合理设计结构参量可得到10-3量级大小的双折射;微结构光纤的双折射对光波波长极其敏感,并出现随波长变化快慢轴交换的现象。采用统计的方法对双折射与微结构光纤空气孔直径随机变化的统计相关性进行了理论分析,假定空气孔直径为高斯分布,获得了双折射大小的平均值和标准偏差与随机变化孔径的统计关系。结果表明,由孔径分布不规则所产生的双折射的大小主要取决于空气孔直径的平均值。 相似文献
7.
8.
9.
10.
设计了一种新型高双折射光子晶体光纤,即其包层引入椭圆形空气孔,且以三角晶格方式周期排列,纤芯引入亚波长尺寸(~0.16 μm)的微型双孔结构阵列.采用全矢量有限元法和各向异性完美匹配层边界条件分析了该型光子晶体光纤的双折射特性和色散特性,详细介绍了该光子晶体光纤在不同的椭圆率、椭圆归一化面积、微型双孔孔径、两小孔之间间距的情况下双折射和限制损耗随波长的变化曲线.模拟结果表明,通过同时在包层和纤芯引入非对称性,获得了较高的双折射(~10-3量级)和极低(~10-4 dB/km)的限制损耗.提供了一种新的光子晶体光纤设计方法,即通过同时在包层和纤芯引入新结构来同时获得高双折射和低损耗. 相似文献
11.
本文采用计算介质波导色散关系的叠代矩量法计算阶跃型椭圆光纤两个基本偏振模式的传播常数、几何双折射及群折射率差.本方法简便、有效,能给出与精确数值计算吻合的结果. 相似文献
12.
双折射光纤受激喇曼散射的研究 总被引:1,自引:0,他引:1
本文详细地研究了双折射光纤的受激喇曼散射.观测到9级斯托克斯受激喇曼谱.文中讨论和测试了阈值和频移与泵浦光偏振方向间的关系;当泵浦光偏振方向与光纤椭圆核的长轴或短轴平行时的传输损耗.并根据测得的阈值在理论上计算了各级斯托克斯线的喇曼增益系数. 相似文献
13.
用等效矩形波导近似,结合一级微扰理论,研究了双模椭圆芯光纤的传播特性,得到了双模运行的V值范围和Ex21模与Ex11模之间的双折射、模间色散随归一化频率和椭圆比的变化关系曲线 相似文献
14.
Wavelength-selective characteristics of high birefringence photonic crystal fiber with Au nanowires selectively filled in the cladding air holes 下载免费PDF全文
Filter characteristics of a designed gold-filled high birefringence photonic crystal fiber are investigated based on the finite element method. The wavelength filter resonances in the high birefringence photonic crystal fiber occur at different points for different polarized directions, and the resonance strength in the x-polarized case is much weaker than that in the y-polarized case. The much more obvious splitting filter characteristics and different resonance strength imply the study and application values in splitting and single polarization fiber devices. The simulation results show that increasing the number of the gold wires only enhances the resonance strength when there is no surface plasmon supermode formed. With the diameters of the gold wires increasing, the response wavelength moves to a longer wavelength, and the strength becomes stronger. When the diameter is increased to 1.4 μm, the response wavelength in the x-polarized case can be tuned to 1.318 μm, which is the communication wavelength. The strongest resonance occurs at 1.2375 μm in the y-polarized case, and the peaking loss can reach 435.83 dB/cm. 相似文献
15.
Coupling characteristics of high birefringence dual-core As2S3 rectangular lattice photonic crystal fiber 下载免费PDF全文
A type of As2S3 chalcogenide glass mid-infrared dual-core photonic crystal fiber has been proposed.The dualcore photonic crystal fiber(PCF) consists of two asymmetric cores.The high polarization property and the coupling characteristics have been studied by using the finite element method and mode coupling theory.Numerical results show that the birefringence at wavelength λ = 10 μm is up to 0.01386 and the coupling length can reach wavelength λ = 5 μm,261 μm and 271.44 μm for x-polarized mode and y-polarized mode,respectively.It demonstrates that a 6.786-mm-long fiber can exhibit an extinction ratio of better than 10 dB and a bandwidth of 180 nm. 相似文献
16.
本文给出了双折射光纤中不同模式和偏振组合时受激四光子混频的频移和双折射的关系。文中对正交分泵受激四光子混频应用于光纤总色散的测量进行了实验研究。 相似文献
17.
A novel method to produce a flat-topped laser beam by using a double-clad rectangular waveguide laser with high-index inner cladding is presented. The waveguide dispersion equation for cosine mode was deduced, the condition for the flattened mode was given out, relative gains for guided modes were calculated numerically and analyzed. Results indicate that a gain advantage for the flattened mode is clear, a flat-topped laser beam can be achieved when the optical confinement factor, the gain intensity and the output coupler are chosen suitably. 相似文献
18.
19.
Coupling characteristics of high birefringence dual-core As2S3 rectangular lattice photonic crystal fiber 下载免费PDF全文
A type of As2S3 chalcogenide glass mid-infrared dual-core photonic crystal fiber has been proposed. The dual-core photonic crystal fiber (PCF) consists of two asymmetric cores. The high polarization property and the coupling characteristics have been studied by using the finite element method and mode coupling theory. Numerical results show that the birefringence at wavelength λ = 10 μm is up to 0.01386 and the coupling length can reach wavelength λ = 5 μm, 261 μm and 271.44 μm for x-polarized mode and y-polarized mode, respectively. It demonstrates that a 6.786-mm-long fiber can exhibit an extinction ratio of better than -10 dB and a bandwidth of 180 nm. 相似文献