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提出了一种利用标准参考光谱进行波长校准的方法。实验中利用由宽带光源和光纤可调谐滤波器组成的可调谐光源分别扫描了参考光谱和传感光栅的光谱。在参考通道,ITU标准参考模块的输出是具有固定波长的梳状光谱。利用高斯拟合算法计算出由标准参考透射谱峰值输出的对应的驱动电压,通过样条插值函数获得了滤波器输出波长与驱动电压的关系。计算光栅反射谱峰值对应的驱动电压,利用上面获得的滤波器输出波长与驱动电压的关系式可以计算出传感光栅的Bragg波长。实验结果表明,在较大的波长范围内实现了对多个传感光栅的波长校准,减小了由滤波器非线性输出造成的测量误差,具有较高的重复性。
A method of wavelength calibration using standard reference spectra is proposed. In the experiment, the spectra of the reference spectrum and the sensing grating were scanned respectively by a tunable light source consisting of a broadband light source and a fiber tunable filter. In the reference channel, the output of the ITU standard reference module is a comb spectrum with a fixed wavelength. The Gaussian fitting algorithm was used to calculate the corresponding driving voltage output from the peak of the standard reference transmission spectrum. The relationship between the output wavelength of the filter and the driving voltage was obtained by the spline interpolation function. Compute the drive voltage corresponding to the peak of the reflection spectrum of the grating, and calculate the Bragg wavelength of the sensing grating by using the relation between the output wavelength of the filter and the driving voltage obtained above. The experimental results show that the wavelength calibration of multiple sensing gratings can be achieved in a large wavelength range, and the measurement error caused by the non-linear output of the filter can be reduced with high repeatability.