A novel distributed fiber birefringence, strain and temperature measurement based on homodyne Brillouin optical time domain reflectometry (BOTDR) is proposed. Birefringence measurement is based on the beat period detection of Brillouin beat of the same acoustic mode. Strain and temperature are obtained by measuring the power changes of Brillouin beat spectrum (BBS), which corresponds to the optical interaction of different acoustic modes in a complex profile fiber. The birefringence of a 4.3 km large-effective-area fiber (LEAF) was measured with 0.6-m spatial resolution, and strain and temperature at the end of a 4.5 km LEAF were measured at 1.5-m resolution in 140s.

Date Published: 26 October 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 8421CB (26 October 2012); doi: 10.1117/12.2012124

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)