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The Mach-Zehnder interference theory is used to analyze the relationship between transmission spectrum and strain. The final results obtained from experiments show that the strain sensor\u2019s sensitivity is about \u22126.57\u2009pm\/<jats:italic>\u03bc\u03b5<\/jats:italic> and the linearity is 0.99962 within the range of 0~1000\u2009<jats:italic>\u03bc\u03b5<\/jats:italic>, while the sensor is corroded by HF for 35 minutes at room temperature. In the temperature range of 20\u00b0C~80\u00b0C, the sensor\u2019s sensitivity to temperature is only 1.63\u2009pm\/\u00b0C, which is insensitive to temperature. Because of its advantage compared to traditional optical fiber sensors, this sensor can avert the cross-sensitive problem when temperature and strain are measured together and has some other advantages including easily fabricated, simple structure and accurate sensitivity. 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