An Intrinsic Fiber Ring Laser Based Sensor
with Saturable Absorber¹

L. Li, D. X. Ren, X. Q. Wu*, Q. Ge, S. Huang, and B. L. Yu

School of Physics and Materials Science, Anhui University, Hefei 230039, China

*e-mail: atlaswoo@126.com

Received June 29, 2012; in final form, July 12, 2012

Abstract—A novel configuration of fiber ring laser acoustic sensor, which adopts single-mode fiber as sensing
element, is proposed and demonstrated. Linewidth less than 1 kHz is achieved by introducing a segment of
erbium-doped fiber in the reflecting arm as saturable absorber. A polarization independent unbalanced Michel-
son interrogation interferometer and phase generated carrier demodulation technique are adopted to recover sig-
nal. Experiments demonstrate that the phase sensitivity is 0.018 rad/nm in good linearity and equivalent mini-
mum detect able length change reaches 19.1 pm.

DOI: 10.1134/S1054660X12120183

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