一种分析长周期光纤光栅谐振波长漂移的新方法

A New Method to Analyze the Shift of Resonant Wavelengths of Long Period Fiber Gratings

通过导模与包层模之间的有折射率差或谐振波长与光纤光栅周期的关系图,即可由图解法快速得到谐振波长在写入过程中的漂移特性。进而由几何关系给出了谐振波长漂移规律的解析表达式。

The rules of the shift of resonant wavelengths were obtained conveniently by the curve of the efficient refractive index′s difference between core mode and cladding modes or the curve of resonant wavelengths versus period.Further more,the analytic express of the rules was gotten by geometric analysis.