基于相位掩模法的高阶布拉格波导光栅特性

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160 s·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。

Abstract

The characteristics of high-order Bragg waveguide grating based on phase-mask method are investigated, and the resonant wavelengths of Bragg waveguide grating with different orders all increase with the increasing of saturation coefficient. Influences of the order of grating, diffraction efficiency of phase mask and saturation coefficient on the refractive index modulation of Bragg waveguide grating are taken into consideration synthetically. The largest refractive index modulation amplitude can be acquired when the order of Bragg waveguide grating is 2 and the saturation coefficient is 0.67. In this case, the maximum reflection and the zero bandwidth of Bragg waveguide grating can reach the maximum. The maximum reflection increases and the zero bandwidth decreases with the increasing of grating length. The saturation coefficient of waveguide grating increases with the product of the writing beam intensity and the writing time. The saturation coefficient is 0.67 when the product is equal to 160 s·W/cm2. The optimal saturation coefficient can be acquired by controlling the writing beam intensity and the writing time.

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张爱玲, 田红苗, 李青青, 王钊. 基于相位掩模法的高阶布拉格波导光栅特性[J]. 激光与光电子学进展, 2017, 54(1): 010603. Zhang Ailing, Tian Hongmiao, Li Qingqing, Wang Zhao. Characteristics of High-Order Bragg Waveguide Grating Based on Phase-Mask Method[J]. Laser & Optoelectronics Progress, 2017, 54(1): 010603.

基于相位掩模法的高阶布拉格波导光栅特性

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