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为了解决光纤布拉格光栅制作中波长控制的问题,提高已有方案的精度,提出了一种基于相位掩模法刻写布拉格光栅过程中拉力调节和紫外光补偿的光栅刻写波长两步控制法。在光纤两端悬挂砝码调节其所受拉力,使刻写光栅的中心波长略小于目标波长。使用功率均匀的紫外光对光栅整体进行照射,补偿光栅中心波长到目标波长的差距。该方案控制下,光栅中心波长控制误差在±5pm以内,且对原平台改造小,不会破坏刻栅平台稳定性。实验证明1cm长的切趾布拉格光栅反射率可达到30dB以上。相比已有的应力控制方法,该方法具有控制精度高、平台改动小、系统稳定性好的优点。
In order to solve the problem of wavelength control in the fabrication of fiber Bragg grating and improve the accuracy of the existing schemes, a two-step control method of grating writing wavelength based on the phase mask method for writing tension and UV compensation in Bragg gratings is proposed. Suspend the weights at both ends of the fiber to adjust the pulling force, so that the center wavelength of the writing grating is slightly smaller than the target wavelength. Using a uniform power of ultraviolet light on the grating as a whole to compensate for the grating center wavelength to the target wavelength gap. Under the control of this scheme, the control error of the center wavelength of the grating is within ± 5pm, and the reconstruction of the original platform is small, which will not damage the stability of the engraved grid platform. Experiments show that 1cm long apodised Bragg grating reflectance can reach more than 30dB. Compared with the existing stress control methods, this method has the advantages of high control accuracy, small platform changes and good system stability.