The path imbalance (PI) of the two-arm fiber-optic interferometric sensor is a substantial parameter; a precise value of millimeters is required. Currently the precision reflectometry and the millimeter optical time-domain reflectometry are used to measure the tiny optical path difference, but the performances of these measurements are limited from the length and the resolution of the PI. We propose a new method accomplished by interferometer to accurately measure millimeters to within a few decimeters of the PI.
© 2008 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: April 21, 2008
Manuscript Accepted: August 4, 2008
Published: September 23, 2008
Shih-Chu Huang and Hermann Lin, "Method for path imbalance measurement of the two-arm fiber-optic interferometer," Appl. Opt. 47, 5065-5073 (2008)