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.
© 2010 OSA
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