共查询到18条相似文献,搜索用时 62 毫秒
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用高频CO2激光脉冲写入法在熊猫保偏光纤上写入长周期光纤光栅,并对其偏振特性进行了全面的试验研究.试验结果表明,在输入椭圆偏振光偏振角度0到2π的变化范围内,高频CO2激光脉冲写入法在熊猫保偏光纤上写入的长周期光纤光栅谐振峰幅值会随着入射椭圆偏振光偏振角度的改变发生以π为周期的周期性变化,并且相邻两谐振峰幅值变化趋势相反,相位差为π.在相同偏振角度下将两谐振峰幅值相减,其差值呈近似于锯齿波的周期性变化,周期也为π.在没有发生模式干扰的情况下,谐振峰波长几乎没有发生漂移.基于模式耦合理论,文中还对所观察到的试验现象进行了定性的理论解释. 相似文献
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保偏光纤的连接损耗和消光比分析 总被引:1,自引:0,他引:1
采用模式分析法处理两保偏光纤在连接中各种几何不对准误差引起的损耗和消光比的计算问题,给出了数值求解的结果,该结论对保偏光纤的连接,熔接和耦合等具有一定的指导意义。 相似文献
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本文利用无穷切片模型和Jones矩阵理论,给出了主轴连续旋转的保偏光纤的等效矩阵,并讨论了主轴旋转对消光比的影响. 相似文献
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线圈型全光纤偏振器的研究 总被引:2,自引:0,他引:2
本文采用等效电流法对线圈型全光纤偏振器进行了分析计算.对应于保偏光纤中两正交传输基模的消光比,提出了一种分析保偏光纤弯曲损耗的新方法,这种方法基于将保偏光纤两个不同偏振模式分别等效为两个普通圆光纤的基模,等效参数通过测量不同偏振模式的模场半径来确定.实验证明这种理论计算方法与实验结果一致.最终,我们研制出的线圈型光纤偏振器在1.31μm工作波长下,实测消光比达30dB以上,工作偏振模式插入损耗≤3dB. 相似文献
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Design of diamond-shape photonic crystal fiber polarization filter based on surface plasma resonance effect 下载免费PDF全文
A novel plasmonic polarization filter based on the diamond-shape photonic crystal fiber(PCF) is proposed. The resonant coupling characteristics of the PCF polarization filter are investigated by the full-vector finite-element method. By optimizing the geometric parameters of the PCF, when the fiber length is 5 mm, the polarization filter has a bandwidth of 990 nm and an extinction ratio(ER) of lower than -20 dB. Moreover, a single wavelength polarization filter can also be achieved, along with an ER of -279.78 dB at wavelength 1.55 μm. It is believed that the proposed PCF polarization filter will be very useful in laser and optical communication systems. 相似文献
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Huang Hung-Chia 《Fiber and Integrated Optics》1996,15(2):71-80
This paper presents a rigorous analysis of spun hi-bi (highly birefringent) fibers, loosely categorized as elliptically bi fibers, via the initial value problem approach. Two kinds of transmission problem are treated. In the single-eigenmode transmission regime, it is found that the major technological difficulty inherent to spun hi-bi fibers concerns excitation of the eigenmode, which strictly requires that the launched light be exactly oriented in conformity with one or the other local principal axes of the fiber and, meanwhile, that the ellipticity of the launched light be exactly equal to the eigen-ellipticity of the same fiber. In the second kind of problem that involves the interaction of two eigenmodes, a basic result is derived to show that an arbitrary polarization mode of excitation will reproduce itself in integer multiples of the local beat length. Such a kind of transmission regime is relieved of the excitation difficulty but, because of being severely length-sensitive, is inherently impractical from the application viewpoint. 相似文献
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Huang Hung-Chia 《Fiber and Integrated Optics》2013,32(2):71-80
Abstract This paper presents a rigorous analysis of spun hi-bi (highly birefringent) fibers, loosely categorized as elliptically bi fibers, via the initial value problem approach. Two kinds of transmission problem are treated. In the single-eigenmode transmission regime, it is found that the major technological difficulty inherent to spun hi-bi fibers concerns excitation of the eigenmode, which strictly requires that the launched light be exactly oriented in conformity with one or the other local principal axes of the fiber and, meanwhile, that the ellipticity of the launched light be exactly equal to the eigen-ellipticity of the same fiber. In the second kind of problem that involves the interaction of two eigenmodes, a basic result is derived to show that an arbitrary polarization mode of excitation will reproduce itself in integer multiples of the local beat length. Such a kind of transmission regime is relieved of the excitation difficulty but, because of being severely length-sensitive, is inherently impractical from the application viewpoint. 相似文献
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Yongtao Li 《中国物理 B》2022,31(5):54215-054215
A novel ultra-broadband polarization splitter based on a dual-core photonic crystal fiber (DC-PCF) is designed. The full-vector finite element method and coupled-mode theory are employed to investigate the characteristics of the polarization splitter. According to the numerical results, a graphene-filled layer not only broadens the working bandwidth but also reduces the size of the polarization splitter. Furthermore, the fluorine-doped region and the germanium-doped region can broaden the bandwidth. Also, the 4.78 mm long polarization splitter can achieve an extinction ratio of -98.6 dB at a wavelength of 1550 nm. When extinction ratio is less than -20 dB, the range of the wavelength is 1027 nm-1723 nm with a bandwidth of 696 nm. Overall, the polarization splitter can be applied to all-optical network communication systems in the infrared and near-infrared wavelength range. 相似文献
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