Lim Sun Do, Park Hyun Chul, Lee Kwanil, Lee Sang Bae, Kim Byoung Yoon
Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, South Korea.
Opt Express. 2010 Feb 15;18(4):3574-81. doi: 10.1364/OE.18.003574.
A high-accuracy measurement method for the noncircularity (ellipticity) of silica glass fibers is demonstrated. This method makes use of the phase velocity difference between two eigen polarization modes of the lowest-order acoustic flexural wave in an optical fiber. The relationship between the acoustic phase velocity difference and the fiber ellipticity is formulated. Three types of optical fibers were examined; photonic crystal fiber, elliptical core fiber, and standard single-mode fiber. Fiber ellipticity of less than 0.001 was successfully measured.
