PROCESS FOR PRODUCING AN ELLIPTICAL FIBER OPTICAL, AND PROCESSED PREFORM USED FOR PRODUCING AN ELLIPTICAL FIBER OPTICAL FIBER

摘要

P A method of producing an optical fiber with an elliptical core is described, in which an initial preform having a circular core (3) disposed in the center of a circular sheath (2) is treated to be flattened at its periphery. to form a processed preform (1) which is then drawn by heating into an optical fiber with an elliptical core. In accordance with the invention, the shape of the treated preform used to produce an optical fiber with an elliptical core with specific dimensions desired can be designed using pre-obtained correlations based on the dimensions of the elliptical core optical fiber. If the preform treated is designed as it is stretched by heating, an optical fiber with an elliptical core having specific dimensions desired can be obtained in a simple and reliable manner. /P