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侧边抛磨多模光纤(SPMMF)与侧边抛磨单模光纤(SPSMF)相比,具有工艺上容易实现的优势。为了研制SPMMF传感器,分析SPMMF中光功率传输特性,首先利用有限差分光束传输法(BPM)模拟计算了不同剩余半径SPMMF中的光强、模场分布以及光纤中传输光功率与抛磨区覆盖材料折射率的关系,并进行了实验验证。实验结果与模拟结果相互吻合:当抛磨区覆盖材料折射率小于1.440时,光功率透过率接近在空气中的透过率;当覆盖材料的折射率逐渐增大到1.458时,光功率透过率减小到最小值,且最小值不小于0.001;当覆盖材料的折射率大于1.458时,光功率透过率由最小值逐渐增大,最终维持在一个相对稳定的值;不同剩余半径的SPMMF中的传输光功率透过率不同,剩余半径越小,SPMMF中传输光功率透过率越小。
Side-polished multimode fiber (SPMMF) is technologically easy to implement compared to side-polished single-mode fiber (SPSMF). In order to develop the SPMMF sensor and analyze the optical power transmission characteristics in the SPMMF, the light intensity and mode field distribution in different residual radius SPMMF and the transmission optical power in the optical fiber are compared with those in the polishing area using the finite difference beam transmission method (BPM) The relationship between refractive index and experimental verification. The experimental results are in good agreement with the simulation results. When the refractive index of polishing material is less than 1.440, the optical power transmittance is close to the transmittance in air. When the refractive index of the covering material is gradually increased to 1.458, And the minimum value is not less than 0.001. When the refractive index of the overlay material is more than 1.458, the optical power transmittance gradually increases from the minimum value and finally maintains a relatively stable value; the values of the different residual radii The transmission power of SPMMF is different, and the smaller the remaining radius is, the smaller the transmission power of SPMMF is.