A known refraction-sensitive optical fiber comprises a core zone with an index of refraction n K , a jacket zone surrounding the core zone, said jacket zone having an index of refraction n M , and an annular zone made of quartz glass doped with fluorine, said annular zone surrounding the jacket zone and having an index of refraction N F , where n F <n M <n K . With this as a starting point, an optical fiber is to be provided that is characterized by high refraction-sensitivity, good spliceability and compatibility, and a method is to be provided for cost-effective manufacture of such a fiber. With regard to the method, this object is accomplished according to the invention in that the quartz glass of the annular zone (21) is produced in a plasma deposition process on the outside in which an annular zonal layer made of the quartz glass doped with fluorine is produced on a substrate body (20), said layer having a layer thickness of at least 1 mm and an index of refraction n F <1.4519 relative to the D line of the sodium vapor lamp.

Refraction-sensitive optical fiber, quartz glass tube as a semi-finished product for the manufacture-thereof and method for the manufacture of the fiber

To improve a known method for making a quartz glass tube as a semifinished product for the manufacture of optical fibers, the tube comprising an inner fluorine-doped quartz glass layer and an outer quartz glass layer, so as to achieve inexpensive manufacture and improved dimensional stability of the quartz glass tube, it is suggested according to the invention that the quartz glass of the inner layer should be produced in a first plasma deposition process with formation of an inner layer having a wall thickness of at least 1.5 mm, with a fluorine content of at least 1.5% by wt. being set in the quartz glass, and that the quartz glass of the outer layer should be produced in a second plasma deposition process and deposited directly or indirectly on the inner layer with formation of a composite tube, and that the composite tube should be elongated into the quartz glass tube.

Quartz glass tube as a semifinished product for preform and fiber manufacture, and method for making the quartz glass tube

The invention relates to a method for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending, having the steps: provision of a shell tube with a shell refractive index which is lower in relation to the light-conducting core, application of at least one protective, intermediate and/or barrier layer to a radially outermost and/or innermost tube surface of the respective shell tube, wherein a build-up of light-conducting layers is realized on the inner side and/or the outer side of the shell tube, and final joining of the shell tubes by collapsing so as to form the semifinished part.

Method for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending

In plasma deposition processes for producing an optical preform according to the POD method, a cladding glass layer composed of fluorine-doped quartz glass is produced by means of a plasma torch on a cylindrical substrate body composed of quartz glass, said substrate body rotating about the longitudinal axis thereof. In this case, the plasma torch performs a reversing relative movement between two turning points (A; B) along the substrate body. In order, proceeding therefrom, to achieve a high fluorine doping in conjunction with a dopant distribution that is as uniform as possible axially, the invention proposes that a heat element has a heating effect on the region of one turning point (A; B) when the plasma torch is situated in the region of the other turning point (B; A).

Plasma deposition process for producing an optical preform with a cladding glass layer composed of fluorine-doped quartz glass

To improve a generally known method for producing a tubular semifinished product from fluorine-doped quartz glass such that it is possible to produce a tubular semifinished product of fluorine-doped quartz glass with an inner bore of high quality while the efforts for making or treating the same are as small as possible, the present invention suggests a method comprising the following steps: (a) providing a substrate tube consisting of fluorine-doped quartz glass; (b) forming, in a deposition process, SiO2 particles by means of plasma burners and in the presence of fluorine, and depositing said particles in layers on the cylindrical outer surface of the substrate tube rotating about its longitudinal axis with formation of a mother tube consisting of fluorine-doped quartz glass; and (c) elongating the mother tube in an elongation process to obtain the tubular semifinished product.

Method for producing a tubular semifinished product from fluorine-doped quartz glass

Um allgemein bekannte Verfahren zur Herstellung eines rohrformigen Halbzeugs aus fluordotiertem Quarzglas dahingehend zu verbessern, dass die Herstellung von rohrformigem Halbzeug aus fluordotiertem Quarzglas mit hochwertiger Innenbohrung bei moglichst geringem Aufwand fur deren Erzeugung oder Bearbeitung ermoglicht wird, wird erfindungsgemas ein Verfahren vorgeschlagen, das folgende Verfahrensschritte umfasst: (a) Es wird ein Substratrohr aus fluordotiertem Quarzglas bereitgestellt, (b) in einem Abscheideprozess werden SiO2-Partikel mittels Plasmabrenner und in Gegenwart von Fluor gebildet und auf der Zylindermantelflache des um seine Langsachse rotierenden Substratrohres unter Bildung eines Mutter-Rohres aus fluordotierem Quarzglas schichtweise abgeschieden und (c) in einem Elongierprozess wird das Mutter-Rohr zu dem rohrformigen Halbzeug elongiert.

Verfahren zur Herstellung eines rohrförmigen Halbzeugs aus fluordotiertem Quarzglas

Um allgemein bekannte Verfahren zur Herstellung von fluordotiertem Quarzglas, bei denen mittels eines Plasma-Abscheideprozesses SiO2-Partikel in Gegenwart von Fluor gebildet und schichtweise auf einem Ausenmantel eines um seine Langsachse rotierenden, zylinderformigen Substratkorpers aus Quarzglas abgeschieden und zu einer Schicht aus Quarzglas mit einem Fluorgehalt von mindestens 1,5 Gew.-% verglast werden, dahingehend zu verbessern, dass ein Halbzeug aus Quarzglas mit hohem Fluorgehalt erhalten wird, das sich durch eine hohe Grundtransmission im UV-Wellenlangenbereich auszeichnet, wird erfindungsgemas vorgeschlagen, dass der Substratkorper mindestens im Bereich des Ausenmantels eine Reservoirschicht aus Quarzglas aufweist, das einen Hydroxylgruppengehalt von 200 Gew.-ppm oder mehr und/oder einen Wasserstoffgehalt von 1 · 1017 Molekulen/cm3 oder mehr aufweist.

Verfahren zur Herstellung von fluordotiertem Quarzglas sowie Halbzeug aus fluordotiertem Quarzglas

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Method for producing a tubular semifinished product from fluorine-doped quartz glass

Verfahren zur Herstellung eines rohrförmigen Halbzeugs aus fluordotiertem Quarzglas

Verfahren zur Herstellung von fluordotiertem Quarzglas sowie Halbzeug aus fluordotiertem Quarzglas