Opt Lett. 2019 Nov 1;44(21):5129-5132. doi: 10.1364/OL.44.005129.
We propose a compact linear polarization spectrometer based on the in-fiber polarization-dependent diffraction grating. The beam profile of radiated light of the grating is shaped to be a Gaussian profile to improve the performance of the spectrometer, where the size of the focused light spot is reduced from 44 um to 33 um with the shaped radiation mode of the grating. Based on the experimental results, the proposed spectrometer can achieve 0.05 nm resolution and 115 nm wavelength responding range from 1495 nm to 1610 nm. To verify the performance of the proposed fiber spectrometer, we measure the transmission spectra of an excessively tilted fiber grating, which has a pair of orthogonal polarization transmission spectra. Compared with the traditional measuring method, the proposed fiber spectrometer integrates the polarizing and spectral analyzing functions in the measuring system and achieves the polarization-sensitive spectral analysis, which shows good wavelength consistency and perfect polarization characteristics.
我们提出了一种基于光纤偏振相关衍射光栅的紧凑型线性偏振光谱仪。通过将光栅的辐射光束形状设计为高斯形状，提高了光谱仪的性能，其中聚焦光斑的尺寸从 44 μm 减小到 33 μm。基于实验结果，所提出的光谱仪可以实现 0.05nm 的分辨率和 115nm 的波长响应范围，从 1495nm 到 1610nm。为了验证所提出的光纤光谱仪的性能，我们测量了一对正交偏振传输光谱的过度倾斜光纤光栅的传输光谱。与传统的测量方法相比，所提出的光纤光谱仪将偏振和光谱分析功能集成在测量系统中，实现了偏振敏感的光谱分析，表现出良好的波长一致性和完美的偏振特性。
