Abstract
Abstract The cutoff wavelength λc as defined by the CCITT can be defined equivalently as that wavelength for which the attenuation of the second-order LP11 mode is 19.34 dB higher than the attenuation of the fundamental mode. This equivalent definition of λc does not depend on the length and curvature of the fiber. Both measuring methods for λc, the bending method and the multimode reference method, are analyzed and the measurement conditions that lead to the CCITT cutoff wavelength are indicated. The bend attenuation of the second-order mode of a typical matched-cladding, step-index fiber is calculated numerically, and methods are described to determine the length and curvature dependence of the cutoff wavelength from the bend loss data.
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