Patent ID: 8554038
Filing Date: 2013-10-08
Classification: C03B,G02B

Abstract:
1. A manufacturing method of a photonic band gap fiber having a core portion and a cladding portion formed around an outer periphery of the core portion and having holes disposed to form photonic crystal which causes the core portion to act as a crystal defect, the manufacturing method comprising: a preliminary experiment process of measuring a hole diameter d calculating a confinement loss to a normalized wavelength λ/Λ which is obtained based on a wavelength λ normalized by an optional distance-between-holes Λ using a ratio d setting a distance-between-holes by calculating the set distance-between-holes Λ second drawing of forming a manufacturing preform for manufacturing the photonic band gap fiber by using members made of a same material and having a same ratio of hole diameter to distance-between-holes as those of the preliminary experiment preform, and drawing the manufacturing preform by setting a distance-between-holes of the manufacturing preform to the set distance-between-holes Λ the photonic band gap filter manufactured by the manufacturing preform includes a core portion, and the core portion has a shape corresponding to a polygon.