Abstract
Three methods for measurement of the h parameter in single-mode fiber lightguides (SFG) with different degrees of anisotropy are compared experimentally. It is shown that all three methods provide a practically identical result for an SFG with strong anisotropy, while only the method based on excitation of the SFG input by nonmonochromatic radiation of a single polarization mode has an adequate result, provided that the spectral width of the radiation source is comparable with its wavelength.
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