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Two-dimensional microbend sensor based on the 2-core fiber with hump-shaped taper fiber structure

机译：基于具有驼峰形锥形纤维结构的2芯纤维的二维微弯传感器

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摘要

A novel two-dimensional bending vector sensor formed by cascading two hump-shaped tapers (HSTs) in a segment of 2-core fiber (2CF) is proposed and fabricated, in which the HSTs serve as the mode splitting and coupling. Several modes are excited at the first HSTs, where a part of the light energy is propagated within the center core of the 2CF, and the other part is coupled to the external core. Due to the effective refractive index difference between these core modes, they are recoupled into the lead-out single-mode fiber (SMF) at the second HSTs and interfere with each other. The bulge of the HSTs and two cores of the 2CF are distributed in a triangle. Owing to the asymmetric structure, the sensor can distinguish multiple bending directions. In addition, the linear spectral responses for bending and temperature are observed experimentally. The proposed sensor has many advantages, including compact, inexpensive, and high directional resolution ratio. Experiment results show that the sensor can distinguish bending directions and experience a maximum sensitivity of -6.182 nm/m(-1) with a bending range of 0-0.98 m(-1) without dead zone.
机译：提出并制造了一种新颖的二维弯曲矢量传感器，该传感器通过将两个驼峰形锥度（HST）级联在一个两芯光纤（2CF）的段中而制成，其中，该HST用作模分裂和耦合。在第一个HST处激发几种模式，其中一部分光能在2CF的中心核心内传播，另一部分耦合到外部核心。由于这些纤芯模式之间的有效折射率差异，它们在第二个HST处重新耦合到导出单模光纤（SMF）中，并且彼此干扰。 HST的凸起和2CF的两个核心呈三角形分布。由于结构不对称，传感器可以区分多个弯曲方向。此外，实验观察到弯曲和温度的线性光谱响应。所提出的传感器具有许多优点，包括紧凑，廉价和高方向分辨率。实验结果表明，该传感器可以区分弯曲方向，并且在0-0.98 m（-1）的弯曲范围内没有死区时，其最大灵敏度为-6.182 nm / m（-1）。

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