The Impact of GIMMF Pitch on Sensitivity of Curvature Sensor Based on Anti-resonance

We propose and demonstrate a high sensitivity curvature sensor based on the cascaded structure of single mode fiber-graded index multimode fiber-hollow core fiber-single mode fiber, and study the influence of the incident light angle on the sensitivity of anti-resonance curvature sensor. The angle of light entering the hollow core fiber can be modulated by the graded index multimode fiber. Different angles affect the intensity of the spectrum produced by the anti-resonance mechanism. The intensity of the resonance peak generated by the anti-resonance mechanism is sensitive to curvature. The sensor achieves a large dynamic range in the range of 0-9.21 m ^-1 and high sensitivity curvature measurement. The maximum sensitivity of the curvature sensor is -5.00 dB/m ^-1 . And there is hardly any temperature crosstalk sensitivity. The proposed curvature sensor has the advantages of large dynamic range, high sensitivity and low temperature crosstalk.