| 摘要 |
<p>"". Method of producing optical fibres for telecommunication. When producing a glass fibre, having a graded refractive index profile, by means of the double crucible method, the initial product being a pair Or a core and a cladding glass composition having mutually different alkali-ions, a profile is usually obtained which greatly deviates from the desired parabolic form. The invention furnishes the possibility to approximate this very closely. This is attained by a partial substitution of the core alkali ion by the cladding alkali-ion.</p> |
