利用扫描曝光法,通过控制曝光前施加在光纤上的拉力,经过多次不同拉力状态下的光刻技术,实现了多波长光纤Bragg光栅(FBG)的制作。实验发现,多重曝光的子FBG位置和叠加程度对子FBG的谱形有很大的影响,只有当各层子FBG长度、位置完全重叠时,各波长光谱才不会受到短波振荡的影响;对载H增敏光纤,第n+1层子FBG的刻写,总会使前面n层子FBG的波长变大,反射率变强;而对掺Ge光敏光纤,多重曝光只将先制作的子FBG波长变大,而所有子FBG反射率都会变弱。通过合理设计曝光量,在载H单模光纤上制作了阻带谱形一致的四波长FBG。经实验测试,子FBG波长具有相同的温度系数和应变系数。 The multi-wavelength fiber Bragg grating (FBG) was fabricated by scanning exposure method by controlling the pulling force exerted on the optical fiber before exposure and after several times of different lithography. The experimental results show that the position and superposition degree of the sub-FBGs with multiple exposure have a great influence on the spectral shape of the sub-FBGs. Only when the length and position of the FBGs in each layer are completely overlapped, will the respective wavelength spectrum not be affected by the short-wave oscillation. In H-sensitive fiber, the writing of the n + 1 stratum FBG will always make the wavelength of the n-stratum FBG larger and the reflectance stronger. For the Ge-doped optical fiber, the multiple FBG Wavelength becomes larger, and all sub-FBG reflectivity will be weaker. By reasonably designing the amount of exposure, a four-wavelength FBG with a uniform stopband profile was fabricated on an H-mode single-mode fiber. Experimentally tested, sub-FBG wavelengths have the same temperature coefficient and strain coefficient.