Method of manufacture of glass fibers has radial gradient of the index of refraction, in order to guide optical waves

摘要

P the invention relates to the phase of preparation of the blank made of glass in the form of a rod adapted to the pulling of the optical fiber. / p & & p & a first stage of the method comprises the melting of a mixture of boron oxides, silicon, germanium, and sodium level of impurities in the transition metals (iron, copper, nickel) higher (10 * * - 5) that the level of the final blank (10 * * - 6). A second stage consists in the separation into two solid phases in the same time as the construction of a radial gradient in the course of a single operation of shaping by drawing of the blank from a bath in a crucible of platinum and then to remove by conventional treatments, the phase, the less rich in silicon. / p & & p & application to the optical fiber telecommunications. / p