We experimentally demonstrate parallel Fabry-Perot interferometers (FPIs) fabrication in multicore-fiber with individually variable cavity length, for the purpose of discriminative sensing of temperature and strain. First, we theoretically find that, in order to obtain a small condition number of sensitivity matrix, it is necessary to fabricate parallel FPIs with large cavity difference in single multicore fiber. Then, parallel FPIs are inscribed by femtosecond laser selective micro-holes drilling on the seven-core fiber facet, together with fiber fusion splicing process. By the use of image processing algorithm, individual core position is precisely locked, and then parallel FPIs can be obtained on arbitrary two cores of seven-core fiber. With the location of parallel micro-holes and duration time of fiber fusion splicing adjusted, parallel FPIs with different cavity length of 26µm and 61µm can be simultaneously obtained at the central core and surrounding core, respectively. Consequently, each FPI possesses different sensitivity towards environmental temperature and strain. Finally, a proof-of-concept experiment verifies that relative measurement errors of both temperature and strain discriminative sensing are less than 0.5% and 2.5%, respectively.

中文翻译：

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在多芯光纤上制造的平行Fabry-Perot干涉仪，用于温度和应变判别式传感。

我们通过实验证明了在具有独立可变腔长的多芯光纤中制造并行Fabry-Perot干涉仪（FPI），以判别温度和应变。首先，我们从理论上发现，为了获得较小数量的灵敏度矩阵，有必要在单根多芯光纤中制造出具有大空腔差异的平行FPI。然后，通过在七芯光纤小面上钻孔的飞秒激光选择性微孔以及光纤熔接过程来刻划平行FPI。通过使用图像处理算法，可以精确锁定各个纤芯的位置，然后可以在七芯光纤的任意两个纤芯上获得并行的FPI。通过调整平行微孔的位置和光纤熔接的持续时间，可以分别在中心纤芯和周围纤芯同时获得具有26µm和61µm不同腔长的平行FPI。因此，每个FPI对环境温度和应变具有不同的敏感性。最后，一项概念验证实验验证了温度和应变判别感测的相对测量误差分别小于0.5％和2.5％。