Abstract
The measured attenuation coefficient of the LP/sub 11/ modes in curved optical fibers for various radii of curvature in the wavelength region below the cutoff wavelength for LP/sub 11/ modes is discussed. The experimental results indicate that the attenuation coefficient may be strongly enhanced at certain wavelengths due to phase-matched coupling between the LP/sub 11/ modes of the fiber core and whispering gallery modes of cladding. Implications for measurements of the effective cutoff wavelength in optical fibers are discussed. >
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