铒镱共掺光纤光栅的谐振增强型非线性光学效应

Resonant Enhanced Nonlinearity in Yb∶Er Codoped Fiber Bragg Grating

介绍了掺杂稀土元素的光纤非线性增强的机理 ,给出了几种常用的掺杂稀土元素光纤和波导的非线性数据。掺杂稀土元素的光纤的非线性较之普通石英光纤的非线性有较大地增强 ,然而掺杂稀土元素的光纤的非线性响应速度较慢 ,并且和抽运光以及掺杂浓度相关。实验研究了铒镱共掺的光纤光栅的谐振增强型光学非线性 ,采用 980nm抽运光入射到光栅 ,用光谱仪观察光栅的透射谱。当抽运光入纤功率为 10 0mW时 ,可实现 0 2nm的光栅布拉格波长移动。实验证明掺杂稀土元素离子的光纤光栅具有很高的非线性 ,大约为普通光纤光栅的 10 6倍 。

In this article, the mechanism of resonant enhanced nonlinearity is introduced in rare earth doped fibers. The nonlinearity data of several rare earth doped fibers are presented. The nonlinearity of rare earth doped fibers is much greated than that of common silica fiber. However, the nonlinearity respond speed in rare earth doped fibers is lower than that in common silica fiber. At the same time, the nonlinearity enhancement is correlative with pump and dopant concentration. The resonant enhanced nonlinearity of Yb∶Er codoped fiber Bragg grating has been investigated by experiment. The transmission spectrum of the FBF with various incident powers of 980 nm laser is recorded. The Bragg wavelength was shifted 0 2 nm with 100 mW incident power. This experiment demonstrates that the nonlinearity of rare earth doped fiber Bragg grating has high nonlinearity coefficient as high 10 6 times as common silica fiber gratings. This type FBG has some application potentials in all optical switch.