A two-loop Sagnac interferometer is proposed for fiber-optic distributed sensing. The location of a disturbance can be determined from the two output phase signals of the two Sagnac loops, and the amplitude of the disturbance can be obtained by integration of the phase signal. A prototype distributed impact sensing system has been tested based on the two-loop Sagnac interferometer.
© 1996 Optical Society of America
Original Manuscript: October 25, 1995
Published: March 15, 1996
Xiaojun Fang, "Fiber-optic distributed sensing by a two-loop Sagnac interferometer," Opt. Lett. 21, 444-446 (1996)