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Standard single-mode communication fibers have been characterized with respect to their mode-preservation capability in the dual-mode regime. For a 1300-nm single-mode fiber working at 830 nm, the equivalent h parameter for its LP(01) and LP(11) modes is shown to be as good as that for the best polarization-maintaining fibers, i.e., better than -20 dB-km.
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Kotrotsios et al. (1990) studied this question.
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