[摘要]：A temperature sensor based on modal interference in a hollow-core photonic bandgap fiber (HC-PBGF) is presented. The modal interferometer is fabricated by splicing the two ends of a 12-mm HC-PBGF to the standard single-mode fibers. The airholes in the core and cladding of the HC-PBGF are completely collapsed during the fusion splicing, and the length of the collapsed area of about 300 mu m is observed. The transmission spectra under different temperatures are measured. The sensitivity of 31.8 pm/degrees C is achieved in the range of 25 degrees C-60 degrees C. The influence of the length of HC-PBGF on the sensitivity is also investigated.
