OPTICAL FIBER, AND OPTICAL TRANSMISSION LINE

摘要

PROBLEM TO BE SOLVED: To provide a two-mode optical fiber having a mode dispersion characteristic of &Dgr;τ>0 and d&Dgr;τ/dλ>0.SOLUTION: An optical fiber 1 comprises: an inner core 111 having refractive index distribution of an α-th power type; an outer core 112 having a refractive index n1'; and a clad 12 having a refractive index n2 (n1'