Abstract

We show that linearly polarized light launched at different angles with respect to the major axis of a two-mode, elliptical-core fiber results in an amplitude-modulated beat-length pattern in the far field. The variation of the output pattern is explained theoretically and confirmed experimentally. A polarizer placed at the output of the fiber is shown to eliminate the amplitude modulation in the output signal. A simple theoretical model, based on the weakly guiding assumption, is shown to be helpful in determining few-mode fiber sensor parameters in practical systems.

© 1991 Optical Society of America

Spatially weighted, grating-based, two-mode, elliptical-core optical fiber vibration sensors

Ashish M. Vengsarkar, Jonathan A. Greene, Brian R. Fogg, and Kent A. Murphy
Opt. Lett. 16(21) 1707-1709 (1991)

Direct numerical analysis of dual-mode elliptical-core optical fibers

J. Kenneth Shaw, Ashish M. Vengsarkar, and Richard O. Claus
Opt. Lett. 16(3) 135-137 (1991)

Photoinduced refractive-index changes in two-mode, elliptical-core fibers: sensing applications

Ashish M. Vengsarkar, Jonathan A. Greene, and Kent A. Murphy
Opt. Lett. 16(19) 1541-1543 (1991)

Optical Kerr switch using elliptical-core two-mode fiber

H. G. Park, C. C. Pohalski, and B. Y. Kim
Opt. Lett. 13(9) 776-778 (1988)

Use of highly elliptical core fibers for two-mode fiber devices

B. Y. Kim, J. N. Blake, S. Y. Huang, and H. J. Shaw
Opt. Lett. 12(9) 729-731 (1987)