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研制了一种通过手工熔接方法在两段单模光纤(SMF)间焊接一段实芯光子晶体光纤(PCF)而形成的Mach-Zehnder干涉仪(MZI)传感器,研究了传感器传输光谱与外界折射率的关系。实验结果表明,这种MZI传感器的中心波长随着外界折射率的增加向长波方向漂移,在1.340~1.384的折射率变化范围内,干涉长为3.2cm的MZI传感器灵敏度为70.45 nm/RIU。通过腐蚀可以进一步提高传感器干涉光场与外界折射率的耦合程度,腐蚀后传感器的折射率灵敏度可提高到198.77 nm/RIU,约为腐蚀前的2.8倍。在30~100℃温度范围内,传感器的温度灵敏度仅为0.0019 nm/℃,因此在应用中可以克服温度交叉敏感问题,从而为生物化学领域的测量提供了一种全光纤型器件。
A Mach-Zehnder interferometer (MZI) sensor fabricated by soldering a section of solid-core photonic crystal fiber (PCF) between two single-mode SMFs by manual welding was developed. The relationship between the transmission spectrum of the sensor and the external refractive index Relationship. The experimental results show that the center wavelength of MZI sensor drifts in the direction of longer wavelength with the increase of refractive index. The sensitivity of MZI sensor with the interference length of 3.2 cm is 70.45 nm / RIU within the refractive index range of 1.340-1.384. Corrosion can further increase the coupling degree of the sensor’s interference light field with the refractive index of the outside world. The refractive index sensitivity of the sensor after corrosion can be increased to 198.77 nm / RIU, which is about 2.8 times of that before corrosion. The temperature sensitivity of the sensor is only 0.0019 nm / ° C over the temperature range of 30 ° C to 100 ° C, thereby overcoming temperature cross-sensitivity issues in applications, providing an all-fiber device for biochemical measurements.