折射率啁啾调制光纤光栅性能研究

Research of Fiber Bragg Gratings with Chirped Refractive Index Modulation

从耦合模理论出发,详细推导出平均折射率调制啁啾系数、初始位置平均折射率调制系数和啁啾光纤Bragg光栅(FBG)周期啁啾系数之间的对应关系,并进行了数值模拟和实验研究。结果表明:通过对平均折射率调制系数进行啁啾控制,可以利用一块相位掩膜版制作出不同色散补偿量的FBG。

The detailed corresponding relationship of chirped refractive index modulation coefficient, initial refractive index modulation and grating periods chirp coefficient were deduced by using coupled-mode theory, and both the numerical simulation investigation and experimental results were also given. The conclusions are drawn as follows: the equivalent grating periods chirp coefficient is determined by both the chirped refractive index modulation coefficient c and initial reactive index modulation δ¯neff. Both the equivalent grating periods chirp coefficient and grating periods chirp coefficient cp act together to determine the dispersion compensation amount. By properly controlling the average refractive index modulation, we can fabricate different dispersion compensation amount fiber Bragg gratings by using the same phase mask.