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对基于相位掩模法的高阶布拉格(Bragg)波导光栅的特性进行了研究,不同阶数Bragg波导光栅的谐振波长均随饱和系数的增大而增大。综合考虑光栅阶数、相位掩模板衍射效率及饱和系数对Bragg波导光栅折射率调制幅度的影响,当Bragg波导光栅阶数为2,且饱和系数为0.67时折射率调制幅度达到最大,此时Bragg波导光栅的最大反射率最大,零值带宽最大。随着光栅长度的增大,最大反射率增大,零值带宽减小。波导光栅的饱和系数随写入光强与刻写时间乘积的增大而增大,当此乘积为160s·W/cm2时饱和系数为0.67,因此可以通过控制写入光强与刻写时间使饱和系数达到最优。
The properties of high order Bragg waveguide grating based on phase mask method are studied. The resonant wavelengths of Bragg waveguide grating with different orders increase with the increase of saturation coefficient. Considering the effects of grating order, phase mask diffraction efficiency and saturation coefficient on the refractive index modulation amplitude of Bragg waveguide grating, when the grating order of Bragg waveguide is 2 and the saturation coefficient is 0.67, the refractive index modulation amplitude reaches the maximum, then Bragg The maximum reflectance of the waveguide grating is the largest with the largest zero bandwidth. As the grating length increases, the maximum reflectance increases and the zero bandwidth decreases. The saturation coefficient of the waveguide grating increases with the increase of the product of writing intensity and writing time. When the product is 160s · W / cm2, the saturation coefficient is 0.67. Therefore, by controlling the writing intensity and writing time, the saturation coefficient Achieve the best