A new concept to measure rotation angles based on a fiber-optic modal Mach–Zehnder interferometer is demonstrated by using a nonadiabatic taper cascaded with a long-period fiber grating. Information about the magnitude of the rotation angle can be obtained from the measurement of the interference pattern visibility, and under certain conditions it is also possible to obtain the sign of the rotation angle from the induced phase variation in the fiber interferometer.
© 2006 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: May 24, 2006
Revised Manuscript: July 14, 2006
Manuscript Accepted: July 21, 2006
Published: September 25, 2006
O. Frazão, R. Falate, J. L. Fabris, J. L. Santos, L. A. Ferreira, and F. M. Araújo, "Optical inclinometer based on a single long-period fiber grating combined with a fused taper," Opt. Lett. 31, 2960-2962 (2006)