LOW-NONLINEARITY SINGLE-MODE OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a low-nonlinearity single-mode optical fiber which can increase the number of wavelength-multiplex by sufficiently suppressing nonlinear effect and making a dispersion slope sufficiently small.;SOLUTION: The low-nonlinearity single-mode optical fiber is composed of a core and a clad 5 covering the core; and the core is formed in four-layered structure by concentrically stacking a 1st core layer 1 as the innermost layer to a 4th core layer 4 as the outermost layer and has a refractive index distribution represented by n₁n₃n₂≥n₀n₄, where n₁ is the mean refractive index of the 1st core layer 1, n₂ the mean refractive index of the 2nd core layer 2, n₃ the mean refractive index of the 3rd core layer 3, and n₄ the mean refractive index of the 4th core layer 4; and the gradient of a wavelength distribution as a propagation characteristic in a 1.55 μm-wavelength band is ≤0.070 ps/nm/ nm/km and the effective sectional area is ≥68 m².;COPYRIGHT: (C)2003,JPO