包层直径

应用耦合模理论，分析了单个LPG的谐振波长和透射损耗峰值随光纤包层直径减小的变化特性。

Based on the coupled mode theory , the spectral characteristics including the resonant wavelengths and the transmission loss peaks in a single LPG with the reduction of the fiber cladding diameter were analyzed .

实验中采用氢氟酸腐蚀的方法来减小光纤包层直径，观察了包层腐蚀的LPG对透射光谱的演变过程，并测量了不同腐蚀程度的LPG对的折射率响应特性。

The HF etching process was utilized to reduce the fiber cladding diameter in the experiment . The evolution of the transmission spectra with the etched LPG pair was observed , and the responses of the LPG pairs with different etching degrees were measured .

工程应用中不同包层直径光栅的结构选择与参数设计

Structure Selection and Parameters Design of FBG with Different Cladding Diameters in Engineering Applications

结果表明，透射光谱中的干涉条纹随着包层直径的减小向红波方向移动，且对应包层模的阶数越高波长移动越大。

The results show that the interference patterns of the transmission spectra experience red shifts with the reduction of cladding diameter .

验证了微结构光纤光栅的多谐振峰结构，并且谐振峰数量取决于内包层直径；

The result validates the multi-peak structure of MOF-FBG , and the dimension of the MOF inner-clad determines the peak number .

光源为时钟脉冲宽带光源，结合时分、波分和空分复用技术，采用不同包层直径光纤相熔接的应变补偿法传感头设计方案，解决温度和应变交叉敏感问题实现应变和温度同时测量。

Light source adopted clock pulse wide band source . The system integrates time division multiplexing and wavelength division multiplexing . Different cladding diameter fiber works as sensing probe . It can realize measurement of strain and temperature simultaneously .

对双椭圆芯的光纤端面的几何参数进行了测量，特种光纤的几何参数包括包层的直径和圆心位置、空气孔的直径和圆心位置、两个椭圆纤芯的长轴和短轴、中心坐标。

The system also measure two ellipse-core fiber geometric data , and the geometric data contain Cladding diameter and Center position , air-hole diameter and center position , long axis and short axis of elliptical core , the center coordinates .

通过模拟，给出基模损耗同芯折射率、光波长和包层空气孔直径之间的一般规律。

After the simulation , the relationship of fundamental mode loss with the core index , wavelength and the diameter of cladding air holes is given .

结果表明可以通过氢氟酸溶液腐蚀敏感部位的包层使其直径减小的方法来提高对外界折射率传感的灵敏度。

Experimental results show that corroding the sensitive parts of the cladding by HF solution to makes its diameter reduced to improve the sensitivity to external refractive index sensing .

该传感器由两段LPG组成，两段LPG所激发的包层模阶数不同，且两段LPG的包层直径也不同。

The sensor consists of two LPG sections exciting different order cladding modes and having different cladding diameters .

用MCVD工艺加溶液掺杂法研制成功了大几何尺寸、大数值孔径内包层的掺Yb3+双包层石英光纤，内包层直径125μm，数值孔径达0.36。

Yb 3 + doped double clad silica fiber with large geometry and numerical aperture was developed by using MCVD process and solution doping technique . The diameter and numerical aperture of inner cladding are 125 μ m and 0.36 , respectively .