Abstract We demonstrate cascaded multiple Fabry–Perot interferometers in multimode fiber with a waveguide, inscribed by femtosecond laser micromachining. The device can sustain high temperature up to 1000 °C, and the temperature sensitivity obtained is 10.1 pm/°C and 17.1 pm/°C within the temperature region 100–400 °C and 400–1000 °C respectively. Compared with single-mode fiber, multimode fiber has a larger core diameter and a higher numerical aperture, allowing more optical power to be coupled from the light source. Thus the optical fiber sensors based on multimode fiber do not have high requirements on the light source used, the system cost can be reduced.

中文翻译：

---

在多模光纤中制造的带有波导的级联多个法布里-珀罗干涉仪

摘要 我们展示了多模光纤中的级联多个法布里-珀罗干涉仪，通过飞秒激光微加工刻录了一个波导。该器件可承受高达1000°C的高温，在100-400°C和400-1000°C的温度范围内，获得的温度灵敏度分别为10.1 pm/°C和17.1 pm/°C。与单模光纤相比，多模光纤具有更大的芯径和更高的数值孔径，允许从光源耦合更多的光功率。因此基于多模光纤的光纤传感器对使用的光源要求不高，可以降低系统成本。