Based on a cavity-length tunable fiber-loop resonator, a multibeam optical path difference is generated. It can be used to match and correlate the reflective signals from the partial reflective ends of each sensing fiber gauge. The correlation signals correspond to the sensing gauge lengths, and the shift of the correlation peak is related with the fiber sensing gauge elongation caused by strain or temperature. Therefore, it can be used to measure distributed strain or deformation for smart structural monitoring.
© 2010 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: July 12, 2010
Manuscript Accepted: August 12, 2010
Published: October 8, 2010
Yonggui Yuan, Bing Wu, Jun Yang, and Libo Yuan, "Tunable optical-path correlator for distributed strain or temperature-sensing application," Opt. Lett. 35, 3357-3359 (2010)