给出了对波导管弯曲损耗的要求。
Requirements for minimizing the waveguide axis bending are given.
在本论文中，首先根据光纤的弯曲损耗原理监测岩层的变形。
In this paper, with bending loss of optical fiber, deformation of rock layer can be monitored.
为了数值求解平面光波导的弯曲损耗，首先给出了平面弯曲光波导的传输模型。
Propagation model for bent planar waveguides is presented for calculating bent loss in planar waveguides.
利用光线理论研究光纤弯曲损耗与弯曲半径、纤芯折射中以及包层折射率的关系。
By the theory of ray optics, the bend losses of fiber as function of fiber parameters such as core index, cladding index, core radius and bend radius are set up.
利用检测单模双折射光纤弯曲传输损耗装置测绘了光纤的弯曲损耗图及光纤弯曲传输模式图。
Using the instrument for the transmission loss of single mode of winding birefringence optical fiber, the spectrogram of loss and the graph of mode density are obtained.
通过数值模拟弯曲损耗随弯曲半径的变化关系，证实了两种光子晶体光纤均具有弯曲损耗振荡特性。
The bending loss oscillations in the two kinds of PCFs are observed by simulating the relationship between the bending loss and bending radius, and the origin of the loss oscillations was analyzed.
与实际制造出的负色散光纤的弯曲损耗进行了比较，结果表明理论计算得到的数据与实验数据较一致。
Based on the theoretical analysis, the bending loss curve of negative dispersion fiber was presented, being consistent with the experimental result.
铝膜是从紫外到红外都有很高反射率的理想材料，用它来研制的空芯光纤的直线损耗和弯曲损耗均较小。
Aluminum film is the only material with high reflectivity from ultraviolet to infrared. Both straight and bending loss of this kind of hollow waveguides are small.
为了验证该方法的准确性，将计算得到的弯曲损耗结果与以往的实验结果相比较，结果表明，在弯曲半径较大的情况下两者基本吻合。
Numerical results are compared with the experiment before in order to testify the accuracy of the method. They agree well with each other, especially for large bending radii.
通过对不同应用的光纤波导结构的制造、性能测试和分析，指出了波导结构设计与光纤衰减、模场直径、弯曲损耗和波导色散等的关系。
Based on manufacture, performance test and analysis of different optical fiber waveguides, the relationships between waveguide and loss, MFD, bend loss, waveguide dispersion are deduced respectively.
最后，文中给出了一个利用这种等效方法计算弯曲波导损耗的例子。
The bending loss of a SOI bent waveguide is also calculated with the present and conventional EIMs respectively.
最后以单模光纤弯曲和微弯损耗为例，说明等效电流方法还适用于广义耦合波理论才能求解的问题。
At last, taking bending and microbending loss for single mode fibers as an example, we see that this method also applied to problems which can be solved by generalized coupled mode theory.
从理论上讲，弯曲和形变都会增大光纤的传输损耗。
Theoretically bend and deformation increase transmission losses in the fiber.
结果表明，弯曲处引入的新缺陷空气孔在极大程度上改善了光子晶体波导的损耗，并最终得到了较好的传输效果。
Optimization are done on some photonic structures, through the introduction of a new air-cylinder in bend finally we have got a comparatively good light propagation outcome.
结果表明，弯曲处引入的新缺陷空气孔在极大程度上改善了光子晶体波导的损耗，并最终得到了较好的传输效果。
Optimization are done on some photonic structures, through the introduction of a new air-cylinder in bend finally we have got a comparatively good light propagation outcome.
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