包层模耦合抑制的B/Ge共掺光敏光纤  

B/Ge Co-Doped Photosensitive Fiber with Suppression of Cladding Mode Coupling

作　　者：龚岩栋[1] 王智[1] 关雅莉[1] 简水生[1] 

机构地区：[1]北方交通大学光波技术研究所,北京100044

出　　处：《光学学报》2001年第5期563-566,共4页Acta Optica Sinica

基　　金：国家自然科学基金 !(6 99770 0 3);高等学校骨干教师资助;计划资助项目;北京交通大学论文攀登基金!部分资助

摘　　要：光纤光栅的包层模耦合造成的布拉格波长短波长带损耗限制了光栅的使用范围。分析了同时具有下陷内包层和光敏内包层的光敏光纤可以在相当程度上抑制包层模耦合 ,并采用化学汽相淀积工艺制作了硼和锗共掺(B Ge)的光纤 ,在其下陷内包层内也掺入了适量的硼和锗 ,具有一定的光敏性 ,经用相位掩膜法写入紫外光纤光栅证实该光敏光纤不但具有较大的光敏性 ,而且确实抑制了包层模耦合。Cladding mode coupling will lead loss on the short wavelength side of Bragg wavelength and thus limits the grating's wide use. A novel photosensitive fiber design is proposed that have both the depressed cladding and the photosensitive inner cladding in the same fiber. It can suppress cladding mode coupling in some extent. B/Ge co-doped fiber grating with depressed cladding which was also doped with boron and germanium was fabricated. The transmission spectrum of written grating in it verified its larger photosensitivity and suppression of cladding mode coupling.

关 键 词：光敏性 包层模 耦合 光纤光栅 布拉格波长短波长带损耗 光敏光纤 CVD B/Ge 相位掩膜 

分 类 号：TN253[电子电信—物理电子学]