Dong Yongkang, Jiang Taofei, Teng Lei, Zhang Hongying, Chen Liang, Bao Xiaoyi, Lu Zhiwei
Opt Lett. 2014 May 15;39(10):2967-70. doi: 10.1364/OL.39.002967.
We propose and demonstrate an ultrahigh-resolution optical spectrometry based on Brillouin dynamic gratings (BDGs). Taking advantage of creating a long grating in an optical fiber, an ultra-narrow bandwidth optical filter is realized by operating a BDG in a long single-mode fiber (SMF), and the optical spectrometry is performed by sweeping the center wavelength of the BDG-based filter through a swept-tuned laser. The BDG-based optical spectrometry features ultrahigh resolution, large wavelength coverage, and a simple direction-detection scheme. In the experiment, a 4 fm (0.5 MHz) spectral resolution is achieved by operating a BDG in a 400 m SMF, and the wavelength coverage can be readily extended to C+L bands with a commercial tunable laser.
我们提出并演示了一种基于布里渊动态光栅（BDG）的超高分辨率光学光谱仪。利用在光纤中创建长光栅的优势，通过在长单模光纤（SMF）中操作BDG实现了超窄带宽光学滤波器，并通过扫频调谐激光器扫描基于BDG的滤波器的中心波长来进行光学光谱分析。基于BDG的光学光谱仪具有超高分辨率、大波长覆盖范围和简单的方向检测方案。在实验中，通过在400米的单模光纤中操作BDG实现了4飞米（0.5兆赫兹）的光谱分辨率，并且使用商用可调谐激光器可以轻松将波长覆盖范围扩展到C+L波段。
