Patent ID: 8381548

Claim:
A method of manufacturing a photonic band gap fiber base material comprising: a forming step of continuously forming a columnar core glass body which becomes a core and a clad glass body which becomes a clad and coats an outer periphery of the core glass body to obtain an intermediate base material; a hole making step of making a plurality of holes around the core in the clad glass body along a longitudinal direction of the core glass body; an insertion step of inserting in each of the holes a plurality of bilayer glass rods which have a columnar high refractive index portion having a higher refractive index than a refractive index of the clad glass body and an outer layer which has the same refractive index as the clad glass body and coats an outer periphery of the high refractive index portion; and a heating step of heating the intermediate base material in which the bilayer glass rods are inserted in the holes and integrating the intermediate base material and the bilayer glass rods.