![]() ![]() Therefore, the ground crude preform is immersed in a solution including hydrogen fluoride (HF) by 10%, for example, for a given time such that the outermost surface of the outer peripheral part is subjected to etching and the unevenness due to grinding is smoothed.Īlso, the method of the present invention for manufacturing an optical fiber preform can be applied to the preparation of an optical fiber preform for a dispersion managed fiber in which a section where the chromatic dispersion at the wavelength of signal light is positive and a section where the chromatic dispersion at the wavelength of signal light is negative are alternately provided. Furthermore, it is feared that a small amount of metal powder generated from the grinding blade of the lathe as a result of grinding may remain in the uneven part, thereby having an adverse effect on the characteristics of the optical fiber. Moreover, since moisture tends to adsorb to the uneven surface, there is a possibility of the moisture being absorbed into the optical fiber, thereby causing deviation from the pre-determined optical characteristics thereof. Also, when the obtained optical fiber preform is drawn into an optical fiber, there is a fear of the optical fiber being broken. Such unevenness tends to cause a resultant optical fiber to fail to meet the target characteristics. In the case of grinding by a numerically controlled lathe, comparatively significant unevenness occurs on the ground surface. ![]() Preferably, a processing by etching is performed after grinding. C03B37/01228- Removal of preform material.diameter, of tubes or rods in general, e.g. C03B37/01225- Means for changing or stabilising the shape, e.g.C03B37/01205- Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments.C03B37/012- Manufacture of preforms for drawing fibres or filaments.C03B37/01- Manufacture of glass fibres or filaments. ![]()
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