| 摘要 |
PURPOSE: A distributed refractive index optical fiber having a multilayer structure of concentric layers can be manufactured continuously by supplying (co)polymers to a concentric multilayer nozzle, and drawing the (co)polymer therefrom. CONSTITUTION: The optical fiber made of (co)polymers selected from the group consisting of homopolymers HP1, HP2,..., and HPn manufactured from two or more kinds of monomers M1, M2,..., and Mn and having refractive indexes gradually lowering in this order, and one or more kinds of binary copolymer CP of these monomers. Mixed layers of mixtures of the (co)polymers of the adjacent layers are formed between the adjacent layers. The central portion of the optical fiber has the highest refractive index, and the refractive indexes of the optical fiber decreasing gradually toward the outer circumferential portion thereof. This optical fiber can be manufactured continuously by supplying (co)polymers to a concentric multilayer nozzle, and drawing the (co)polymer therefrom. The polymers mutually diffused among the layers.
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