| 摘要 |
The present invention relates to an S-mode optical fiber having a structure which can effectively restrain dispersion slope from increasing. In this S-mode optical fiber, an optical core is constituted by inner and outer cores (110,120), while an optical cladding is constituted by an inner cladding (210) in which "tailing" occurs and an outer cladding (220). In a cross section of the S-mode optical fiber perpendicular to its signal light propagating direction, when surface integral values of relative refractive index difference with respect to a reference region having an average refractive index n0 are S1 and S2 in the optical cladding and optical core, respectively, the S-mode optical fiber is designed to satisfy a relationship of 0 < S1/S2 ≤ 0.3. As a result of this configuration, it can effectively restrain dispersion slope from increasing due to "tailing" which inevitably occurs during its manufacturing process. <IMAGE> |
