Each mode of an optical fiber accumulates, as a function of the fiber length, a linear phase delay dependent on its propagation constant plus a nonlinear delay, due to the optical Kerr effect, depending on the power it carries. Thus any variation or fluctuation of this power reflects on a variation or fluctuation of this nonlinear phase delay. As a consequence, if two modes are present, in particular, the two orthogonally polarized states of a monomode optical fiber, an intensity-dependent fluctuating phase difference ΓNL between them arises, which, neglecting chromatic dispersion, is given by1

© 1984 Optical Society of America

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