편광유지 광섬유 내 브릴루앙 동적 격자를 이용한 고감도 반사 측정법

초록

A high-sensitivity optical time-domain reflectometry based on Brillouin dynamic grating(BDG) is proposed and experimentally demonstrated in polarization-maintaining fibers, where a single-end access to a fiber under test is applied with co-propagation of pump and probe pulsed for the operation of the BDG. Distributed measurements of the BDG spectra are presented with 80 cm spatial resolution in 935 m range, showing strain and temperature sensitivities of 1.37MHz/ue and -57.48MHz/C, respectively.