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A theoretical analysis of the SCF\u2019s sinusoidal spectral response in transmission configuration is presented. The proposed sensor comprises two SCF devices exhibiting anti-phase transmission spectra. Simple fabrication of the devices is shown by just splicing a segment of a 2 cm long SCF between two single-mode fibers (SMFs). The sensor proved to be robust against light source fluctuations, as a standard deviation of 0.2% was registered in the ratiometric measurements when the light source varied by 12%. Its low-cost detection system (two photodetectors) and the range of temperature detection (25 \u00b0C to 400 \u00b0C) make it a very attractive and promising device for real industrial applications.<\/jats:p>","DOI":"10.3390\/s23167241","type":"journal-article","created":{"date-parts":[[2023,8,18]],"date-time":"2023-08-18T10:28:48Z","timestamp":1692354528000},"page":"7241","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Highly Coupled Seven-Core Fiber for Ratiometric Anti-Phase Sensing"],"prefix":"10.3390","volume":"23","author":[{"given":"Natanael","family":"Cuando-Espitia","sequence":"first","affiliation":[{"name":"CONACyT-Electronics Department, University of Guanajuato, Carr. 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