Li An, Wang Yifei, Hu Qian, Shieh William
Opt Express. 2015 Jan 26;23(2):1139-50. doi: 10.1364/OE.23.001139.
Few-mode fibers (FMFs) have found applications in optical communications and sensors with attractive features that standard single mode fiber (SSMF) do not possess. We report our recent progress on FMF based optical sensors, and show the potential of utilizing the spatial dimension for multi-parameter sensing with discrimination capability. We first show a discrete type FMF sensor based on interferometer structure with a short FMF, utilizing the modal interference between either the polarizations (x and y) or the spatial modes (LP(01) and LP(11)). We then show a distributed type FMF sensor by generating the stimulated Brillouin scattering (SBS) in a long FMF. We characterize the Brillouin gain spectrum (BGS) with a pump-probe configuration, and measure the temperature and strain coefficients for LP(01) and LP(11) modes. The proposed FMF based optical sensor can be applied to sensing a wide range of parameters.
少模光纤（FMF）已在光通信和传感器领域得到应用，具有标准单模光纤（SSMF）所不具备的吸引人的特性。我们报告了基于少模光纤的光学传感器的最新进展，并展示了利用空间维度进行具有辨别能力的多参数传感的潜力。我们首先展示了一种基于干涉仪结构的离散型少模光纤传感器，它采用短少模光纤，利用偏振（x和y）或空间模式（LP(01)和LP(11)）之间的模式干涉。然后，我们通过在长少模光纤中产生受激布里渊散射（SBS）展示了一种分布式少模光纤传感器。我们采用泵浦 - 探测配置对布里渊增益谱（BGS）进行表征，并测量LP(01)和LP(11)模式的温度和应变系数。所提出的基于少模光纤的光学传感器可应用于广泛参数的传感。
