INTERMODAL INTERFERENCE IN MILLIMETER-LONG POFS FOR TEMPERATURE SENSING

摘要

We observe multimodal interference in single-mode-multimode-single-mode sensors comprising short polymer optical fibers (POFs) with lengths from 100 mm down to 7 mm. Characteristic spectral peaks/dips are observed around 1000 nm. We find that the dip wavelength depends on temperature but that the sensitivity is much lower than those obtained in the longer wavelength range when longer POFs are used. We discuss the significance of our success in observing multimodal interference in millimeter-long optical fibers.