论文部分内容阅读
为了拓宽光纤耦合器的使用范围,开发光纤耦合器的新功能,采用熔锥技术制作波长敏感耦合器,该耦合器在分光的同时对波长敏感。通过耦合理论验证实验结果,实验数据与理论值相符合。实验中得到波长灵敏度最大值为17.86%/nm的耦合器。采用拉锥工艺制作波长敏感耦合器工艺简单,耦合比峰值对应波长控制易于实现。该耦合器可用于光纤光栅布拉格波长漂移解调。令待解调光纤光栅布拉格波长与耦合器波长灵敏度最大值对应的波长一致,当波长发生漂移时,耦合器输出耦合比发生变化。自制的波长敏感耦合器实现了对布拉格波长为1566.71 nm光纤光栅波长漂移的解调,波长漂移1.80 nm,耦合比变化20.34%。此种解调方式具有光路简单,易于与光纤匹配的优点,可以应用在大型建筑中光纤光栅的健康监测。
In order to broaden the use of optical fiber coupler and develop new functions of optical fiber coupler, the use of fused cone technology to produce wavelength-sensitive coupler, the coupler at the same time in the wavelength-sensitive spectroscopy. The experimental results are verified by the coupling theory. The experimental data are consistent with the theoretical values. In the experiment, the coupler with the maximum wavelength sensitivity of 17.86% / nm was obtained. The process of making the wavelength-sensitive coupler by using the taper process is simple, and the control of the coupling ratio and the peak wavelength is easy to realize. The coupler can be used for fiber grating Bragg wavelength drift demodulation. The wavelength of the Bragg wavelength of the FBG to be demodulated corresponds to the wavelength corresponding to the maximum wavelength of the coupler. When the wavelength is shifted, the output coupling ratio of the coupler changes. The self-made wavelength-sensitive coupler realizes the demodulation of wavelength shift of Bragg wavelength grating with wavelength of 1566.71 nm, wavelength shift of 1.80 nm and coupling ratio of 20.34%. This kind of demodulation method has the advantages of simple optical path and easy matching with optical fiber, and can be applied to the health monitoring of fiber grating in large buildings.