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设计了一种带状光纤上阵列光纤光栅刻写系统,仅利用一块相位掩模板,即实现8芯带纤上阵列光纤布拉格光栅的刻写。使用自行设计的带纤夹具夹持带纤,电控位移平台对带纤整体施加拉伸力,采用相位掩模工艺对光纤逐根曝光,并同时以扫描写入的方法进行汉明切趾。刻栅过程由电脑编程控制,中心波长、波长间隔以及切趾方式可以灵活调整。测试结果表明,刻写完成的阵列光纤布拉格光栅3dB带宽为0.2nm、波长间隔为0.5nm、波长偏差小于±50pm、反射率达到80%~85%。
A ribbon fiber array fiber grating writing system is designed. Only one phase mask is used to realize the writing of 8-fiber ribbon fiber Bragg grating. Using self-designed fiberglass clamps, the electrically controlled displacement platform exerts a tensile force on the entire fiber ribbon. The phase mask process is used to expose the fibers one by one, and at the same time, Hamming apodization is performed by scanning and writing. Carved gate process controlled by the computer programming, center wavelength, wavelength spacing and apodization can be flexibly adjusted. The test results show that the written 3dB bandwidth of the arrayed fiber Bragg grating is 0.2nm, the wavelength interval is 0.5nm, the wavelength deviation is less than ± 50pm and the reflectivity is 80% -85%.