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手征光纤中导模的色散特性 总被引:3,自引:1,他引:3
从手征介质中的电磁场本构关系出发,利用麦克斯韦方程组,对纤芯和包层都是手征介质构成的阶跃型手征光纤进行了解析求解,导出了模式场解和特征方程。用数值方法研究了纤芯和包层的手征导纳对手征光纤中导模的归一化传播常数、群延迟、波导色散等特性的影响。 相似文献
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双包层手征光纤中的半漏模 总被引:2,自引:2,他引:2
研究了纤芯和内外外层都有手征的双包层手征光纤中的半漏模,给出了单包层和双包层手征光纤中几个低阶模的有效折射率和功率损耗系数随手征参数的变化关系曲线。结果表明,双包层手征光纤中的半漏模特性与半单包层手征光纤中的相比有很大的不同;当只有包层中有手征时,单包层手征光纤中也存在半漏模。 相似文献
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本文从麦氏方程组和手征媒质的本构关系出发,运用耦合波理论,对各向同性手征媒质均匀填充的手征波导中存在的耦合孪生模式的电场和磁场矢量进行了推导并得到耦合波方程组的一般表达式,同时指出了在弱耦合近似条件下,应用微扰原理求解耦合波方程组的一般思路,为从耦合波的观点来分析手征波导中的各种不连续问题提供了一条新的理论途径。 相似文献
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平板状双轴旋电磁手征波导中的耦合模理论 总被引:3,自引:3,他引:0
本文严格分析了一种新型双轴旋电磁手征波导中耦合模的传输特性。首先,给出了这种双各向异性手征波导中各横向场分量的纵向场分量表示式,由此得到了纵向场分量的耦合模方程,以及平板状双轴旋电磁手征波导中的色散方程。用数值方法研究了它的色散和截止特性,特别考察了双各向异性和手征性引起的波模分裂,转换效应。 相似文献
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本文给出了手征等离子体波导(由在柱形波导中填充手征等离子体材料构成)中横向场量与纵向场量之间的关系式,并给出了纵向场量的求解公式。作为示例,文中具体研究了平行板手征等离子体波导,得到了其中几个低次传播模式的色散特性曲线。 相似文献
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手征等离子体波导理论 总被引:2,自引:0,他引:2
本文给出了手征等离子体波导(由在柱形波导中填充手征等离体材料构成)中横向场量与纵向场量之间的关系式,并给出了纵向场量的求解公式,作为示例,文中具体研究了平行板手征等离子体波导,得出了其中几个低次传播模式的色散特性曲线。 相似文献
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谐振式光纤陀螺(R-FOG)中,偏振波动引起的检测信号漂移对陀螺系统的检测精度有重要影响.通过矩阵法,分析系统中光纤耦合器不同偏振本征态(ESOPs)的耦合系数差异,与所引起的系统零偏的关系,得剑其与两个偏振本征态耦合系数以及光纤环形谐振腔参数间的解析表达式.利用该解析表达式,求解系统零偏为极值时,耦合器不同偏振本征态的最佳耦合系数;该最佳耦合系数仅与光纤环形谐振腔的损耗参数有关.通过Matlab软件进行数值拟合,得到不同偏振本征态耦合系数与系统零偏之间的关系曲线.从理论上建立耦合器耦合系数偏振相关引起的噪声模型.利用该理论模型,对已报道的R-FOG开环实验系统中偏振波动引起的系统零偏进行了估算. 相似文献
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The mode excitation theory is presented to analyze single-mode optical fiber directional couplers with transverse strong coupling, which either the weakly coupling theory or the ray theory fails to expound. By using the equivalence between the waveguides with square and circular cross sections, regarding the coupling zone of the coupler as a single waveguide, the excitation coefficients of the propagation modes in the coupling zone excited by the modes in the input waveguide have been evaluated. The theoretical coupling amount and insertion loss have been studied. Using a special monitoring technique to control the coupling length, several couplers with various coupling amounts have been made by the polishing method. The spectral characteristic of the coupling amount has been measured and compared with the theoretically inferred result. The two are found to agree with each other. The offset effect on the coupling amount has also been measured and it is different from that of the weak coupling device-the Stanford coupler. 相似文献
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利用等厚干涉法测量了棱镜—薄膜耦合器的耦合间隙,在不同耦合间隙下测量了薄膜波导模式的传播常数、薄膜折射率和薄膜厚度。用 Tien 和 Urich 有关棱镜—薄膜耦合器的理论分析了耦合间隙对薄膜参数测量误差的影响。 相似文献
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By means of refractive index gradually changed coupling layers, a highly efficient green top-emitting OLED (TOLED) with enhanced light coupling efficiency and stable colors over angles has been realized. The refractive index transition of the coupling layers including the doping layer smoothes light extraction from the semitransparent cathode metal to the air, which is the reason for the enhancement of light coupling efficiency. The doping layer in the coupling layers also acts as a microparticle diffuser to eliminate the shift in EL spectra with viewing angles. A universal simulation has also been carried out, and the result suggests that the light coupling efficiency will be enhanced further if the refractive index transition of the coupling layers is continuous. 相似文献
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《Microwave Theory and Techniques》1982,30(6):882-893
The coupling characteristics between a single-mode fiber and a square law medium are theoretically and experimentally discussed in order to obtain the optimum coupling design for a variety of single-mode fiber optical devices using square law media. In theoretically analyzing coupling efficiency, it has been possible to evaluate a Gaussian beam, in a dielectric, which has passed through a square law medium with the help of mode-expansion technique and one of the generating functions of the Hermite polynomials. As a result, it has been possible to analytically obtain coupling efficiency even when the output beam from the single-mode fiber is off-axis and tilted. Through this analysis, it has been made clear that the ray matrix analysis used previously agrees with the analysis without the off-axis and tilt factors analyzed in this paper. The experimental results concerning the optimum coupling design, the off-axis characteristics, and the off-axis tolerances have been presented and agree well with the theoretical analysis. 相似文献
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本文对用于端面泵浦的梯度折射率透镜耦合系统作了研究。实验得到了基模工作时大小30%的光-光转换效率。并且讨论了二元光学相位板在耦合系统中的应用。 相似文献
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An effectively nonreciprocal directional coupler has been demonstrated using evanescent coupling between a single-mode and a multimode optical fibre. At least 17 dB difference in coupling efficiency between transmit and receive branches has been measured. The near-field mode patterns show coupling between the single-mode fibre and a few high-order modes of the multimode fibre. 相似文献
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针对制冷型288×4长波焦平面红外探测器组件PLUTON LW K508的特点,设计了一个驱动模块,为探测器组件提供了时序与控制信号、模拟与数字电源、参考电平、制冷模式控制信号等。重点介绍了上电控制电路、GPOL电压产生电路、制冷模式控制电路等关键电路的设计原理与结构。实验结果表明,采集到的红外图像具有噪声低、精度高、稳定性强等特点。当探测器在293 K和353 K之间的黑体照射下,并且积分时间为19 μs时,整个红外图像采集系统采集到的图像噪声电压均值保持在0.4 mV以下。 相似文献