REFRACTIVE INDEX DISTRIBUTION TYPE PLASTIC OPTICAL FIBER AND ITS MANUFACTURING METHOD, OPTICAL FIBER CABLE AND OPTICAL FIBER CABLE HAVING PLUG

摘要

PROBLEM TO BE SOLVED: To easily manufacture a refractive index distribution type plastic optical fiber small in a light scattering loss and excellent in moisture and heat resistance. SOLUTION: In the method for manufacturing the refractive index distribution type plastic optical fiber having a refractive index distribution area where the refractive index is continuously lowered ranging from the central part to the outer peripheral part in the radial direction of the cross section, core material polymer composing the refractive index distribution area is supplied to a spinning device, and it is discharged from a nozzle hole in which a bar shaped resistance imparting member is coaxially inserted and arranged.