We propose and demonstrate a novel distributed fiber-laser pressure sensor. A transverse pressure position is located by determination of the free-spectral range shift induced by mode coupling in an intracavity polarization-maintaining fiber. We demonstrate that the stability and the spatial resolution of the sensor can be enhanced drastically by introduction of a novel mode-locking technique. Resolution of 54 cm in the 150-m range can be realized.
© 2001 Optical Society of America
Shinji Yamashita and Kazuo Hotate, "Distributed pressure sensor with a mode-locked fiber-ring laser," Opt. Lett. 26, 590-592 (2001)