SINGLE MODE OPTICAL FIBER HAVING MULTI-STEP CORE STRUCTURE AND METHOD OF FABRICATING THE SAME

摘要

An optical fiber having a multi-step core structure, and a method of fabricating the same, are provided. The optical fiber includes a central core having a predetermined diameter a1 from an central axis and a refractive index n1, a first outer core having a diameter a2 and a refractive index n2 smaller th an the refractive index n1 and surrounding the central core, a second outer core having a diameter a3 and a refractive index n3 smaller than the refractive index n2 and surrounding the first outer core, and a cladding having a diameter a4 and a refractive index n0 smaller than the refractive index n3 and surrounding the second outer core. The diameter of the core is increased by making the refractiv e index distribution of the core multi-stepped, thus providing easy fabrication. T he optical fiber has a low dispersion value in a 1550nm wavelength, thus making superspeed long distance transmission possible.