Detection of world's shortest hot spots in silica and plastic optical fibers by slope-assisted brillouin optical correlation-domain reflectometry

Based on the “beyond-nominal-resolution” effect of slope-assisted Brillouin optical correlation-domain reflectometry, we demonstrate the detections of shortest-ever hot spots. A 2-mm-long strained section in a silica single-mode fiber and a 5-mm-long heated section in a plastic optical fiber are correctly detected in a distributed manner.