Patent ID: 6428893
Filing Date: 2002-08-06
Classification: D01F,G02B,Y10T

Abstract:
A method of continuous fabrication of a graded index plastics optical fiber in which the refractive index is highest in the center and decreases progressively towards the periphery, said fiber having a plurality of layers of resins deposited concentrically, said method comprising:preparing at least first and second amorphous mixtures each comprising at least one primer, at least one at least partly fluorinated polymer P comprising from 10 to 1000 monomer units, said polymer comprising a main chain and at least two reactive groups, and a reactive diluting agent comprising at least two monomers M1 and M2 with different refractive indices, each monomer being at least partly fluorinated and including a reactive group adapted to react with a reactive group of the polymer P, the proportion as a percentage by weight of said polymer P relative to the sum of the components of each said mixture being substantially constant for each mixture and the proportion as a percentage by weight of said monomer M1 relative to the sum of monomers of the reactive diluting agent varying substantially from one of said mixtures to the other, extruding the first mixture with the highest refractive index to constitute the core, depositing layer(s) of respective decreasing refractive indices on said core, interdiffusing each layer with the adjoining layer(s), and crosslinking the polymer P and the monomers of the reactive diluting agent.