然后对端泵入射光进行建模，研究了纤芯偏心距的优化。
Then, we study the optimization of the offset of the fiber core by simulation of the pumped light.
提出一种基于纤芯失配的光纤倏逝波甲烷传感器。
An optical fiber evanescent wave methane gas sensor based on core diameter mismatch is reported.
光纤光栅是利用光纤材料的光敏性，在纤芯内形成空间相位光栅，它可以改变光波在光导纤维中的传输路径。
Optical fibre grating utilize photosensitive characteristic to form the space phase grating in the core, it can change the transmission route of the light wave in the light-transmitting fibre.
对于两种不同的纤芯距离都观测到稳定的高对比度干涉条纹。
For the two core space cases, the steady high-contrast interference strips are observed.
与普通单模光纤相比，小纤芯pcf具有非线性效应强、布里渊增益大的特点，适合作为布里渊光纤激光器的增益介质。
Compared with common single mode fiber, the small core PCF has higher non-linear coefficient and larger Brillouin gain, and is suitable for the gain medium of Brillouin fiber laser.
其次，对含偶氮苯和聚甲基丙烯酸甲酯共聚的纤芯材料的聚合物光纤光敏特性进行了实验测试。
Then we tested the photosensitivity of POF whose core material was copolymer of azo-benzene and poly (methyl methacrylate) (PMMA) in experiment.
这种光纤的纤芯折射率比包层基质折射率小，所以短波长时基模损耗迅速增大，使得光传输截止。
The index of the core is a little smaller than that of the cladding base material, so the fundamental mode loss of short wavelength increases rapidly and leads to the mode cutoff.
分析了光纤应力区结构对纤芯双折射大小和均匀性的影响，并将应力诱导双折射与模式理论计算结果进行了比较。
The effects of the stress domain structure of the fiber on stress birefringence and modal birefringence are investigated and compared .
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.
由此结果对双折射与包层半径、纤芯半径、和应力区面积大小之间的关系进行了模拟。
The relations between birefringence and envelope radius, birefringence and core radius, birefringence and the area of stress are simulated.
研究表明良好的预制棒加工质量可有效改善光纤纤芯与包层的界面状态，并且相对于纤芯玻璃来说，粘度较高的包层玻璃其加工质量对界面缺陷的影响更为显著。
Compared with core glass, the effect of optical processing quality of cladding glass on interface defects was more evident when its viscosity at drawing temperature was higher tha.
研究了纤芯和内外包层都有手征的双包层手征光纤中的半漏模，发现双包层手征光纤中的半漏模特性与单包层手征光纤中的相比有很大不同。
It was discovered that the characteristics of semi-leaky modes in doubly clad chiral optical fibers are very different from those in single clad chiral optical fibers.
其中，设备管理子系统和光缆管理子系统是整个系统的基础，分别生成空闲的设备埠和光缆纤芯资源，光电路子系统则市对这些资源进行占用、管理。
They manage the resource of optical cable, equipment, transmission path, and so on. the whole system is based on the equipment and optical cable subsystem.
采用模场耦合理论，推导出多模光纤与单模光纤的直接耦合效率表达式，计算得到耦合效率与所选用的多模光纤和单模光纤的纤芯芯径之间的模拟关系。
Based on mode field coupling theory, a model to calculate the butt-joint coupling efficiency between a multi-mode fiber and a single-mode fiber is presented.
椭圆纤芯保偏光纤光栅两个轴的温度灵敏度和应变灵敏度都相同。
Both axes of elliptical core PMF exhibit the same responses to temperature and strain.
它是利用光纤材料的光敏特性在光纤的纤芯上建立的一种空间周期性折射率分布，其作用在于改变或控制光在该区域的传播行为方式。
They are new type of passive optical components, which are based on the periodical distribution of refraction index in fiber core.
详细分析了这种传感器的特性，指出对于特定的外界折射率范围，需设计纤芯折射率、光纤半径、弯曲半径三个参量的最佳组合。
The characteristics of this sensor is analysed. It is concluded that for a certain refractive index range, the index of fibre core, the radius of core and bending radius need to be optimized.
通过在靠近纤芯处加上一层掺氟玻璃，能有效降低带隙内光子的限制损耗。
Confinement loss can be effectively lowered by adding a layer of F-doped glass near the core of this fiber.
增大第一纤芯的有效模场面积将导致开关的阈值增大。
With the increase of the effective mode field area of the first core, the switch threshold power increases.
在特定的实例中，包层的折射率从一个低值单调增加到一个接近或高于纤芯中折射率。
In one practical example, the coating refractive index increases monotonously from one low value to one value higher than or approaching to that of the fiber core.
同时，研究结果表明，这种新型包层折射率调制的光纤光栅可以为解决纤芯高光敏光纤光栅的高损耗问题提供一个较好的解决方案。
Meanwhile, the research results show that the new grating can be a solution to the high attenuation problem of the gratings with the high photosensitive fiber core.
由于受到纤芯面积、非线性效应等因素的限制，单芯光纤激光器的输出功率极限值为千瓦级。
The maximum output power of an optical fiber laser using conventional single core fiber is only several kilowatts due to the nonlinear effect in fiber and the limited cross -section of fiber core.
利用纤芯和包层中的折射率分布实现光传输控制等先进技术被认为是第三代显微学中的激光技术。
The third generation techniques such as light propagation control achieved by refractive index distribution in core and clad are promising.
由纤芯基模、一阶包层模式的场分布推得其功率分布 ，进一步得到两种模式的归一化常量。
Power distributions for fundamental core mode and first rank cladding modes are formulated using their field distributions.
对于两种不同的纤芯距离都观测到稳定的高对比度干涉条纹。
The slope efficiency of the in-phase mode is 37%. For the two core space cases, the steady high-contrast interference strips are observed.
以此为基础，详细研究了光敏内包层对该类型光栅中存在的正向传播的纤芯基模与反向传播的纤芯基模以及与反向传播的包层模之间的耦合的影响。
Based on this, we study the photosensitive inner cladding's influence on the core-mode-core-mode coupling and the core-mode-cladding-mode coupling in this kind of grating.
推导出纤芯、包层、薄膜层、环境层的场分布表达式，利用数值计算求出了包层膜的有效折射率。
Resolve dispersion equation and obtain the effective refractive index of cladding using method of numerical calculation.
忽略轴向的模式耦合以及包层模式之间的相互耦合作用，并认为折射率指数的调制只存在于纤芯中，建立了简化的长周期光纤光栅数学模型。
Then the simplified model for the LPFG is deduced with ignoring longitudinal coupling of modes and coupling of cladding modes themselves, and also assuming the modulation of refractive index exis...
忽略轴向的模式耦合以及包层模式之间的相互耦合作用，并认为折射率指数的调制只存在于纤芯中，建立了简化的长周期光纤光栅数学模型。
Then the simplified model for the LPFG is deduced with ignoring longitudinal coupling of modes and coupling of cladding modes themselves, and also assuming the modulation of refractive index exis...
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