Fiber Optics Group, Department of Physics, University of Ottawa, Ottawa, Ontario K1N6N5, Canada.
Opt Lett. 2012 Oct 1;37(19):3936-8. doi: 10.1364/OL.37.003936.
We report a distributed optical fiber birefringence measurement method based on homodyne Brillouin optical time-domain reflectometry (BOTDR). Unlike conventional BOTDR, which requires scanning of the local oscillator to get the Brillouin spectrum, instead we propose the beat period measurement of fast and slow components of the backscattered Brillouin signal in single-mode fibers using homodyne detection. The beat period is measured by detecting the envelope of the Brillouin beat signal, which gives the beat length at different fiber locations, so that birefringence can be calculated accordingly. The distributed birefringence of a 1.7 km SMF-28 and a 4.3 km large-effective-area fiber were measured with 0.6 m spatial resolution without frequency scanning of the Brillouin spectrum.
我们提出了一种基于相干布里渊光时域反射（BOTDR）的分布式光纤双折射测量方法。与传统的 BOTDR 不同，传统的 BOTDR 需要扫描本振以获得布里渊光谱，而我们则建议使用相干检测来测量单模光纤中反向散射布里渊信号的快、慢分量的拍频周期。通过检测布里渊拍频信号的包络来测量拍频周期，这给出了不同光纤位置的拍长，从而可以相应地计算双折射。我们在不扫描布里渊光谱的情况下，以 0.6 m 的空间分辨率，分别对 1.7 km 的 SMF-28 和 4.3 km 的大有效面积光纤进行了分布式双折射测量。
