DE2519062A1 - Two component fibre with partly supported core - has mechanically protective covering and larger numerical aperture - Google Patents
Two component fibre with partly supported core - has mechanically protective covering and larger numerical apertureInfo
- Publication number
- DE2519062A1 DE2519062A1 DE19752519062 DE2519062A DE2519062A1 DE 2519062 A1 DE2519062 A1 DE 2519062A1 DE 19752519062 DE19752519062 DE 19752519062 DE 2519062 A DE2519062 A DE 2519062A DE 2519062 A1 DE2519062 A1 DE 2519062A1
- Authority
- DE
- Germany
- Prior art keywords
- core
- refractive index
- numerical aperture
- protective covering
- component fibre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4402—Optical cables with one single optical waveguide
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
Zweikomponentenfasern mit teilgestütztem Kern J 4 U u Die vorliegende Erfindung betrifft eine Zweikomponentenfaser mit teilgestütztem Kern und einer Schutzhülle.Bicomponent fibers with partially supported core J 4 U u The present The invention relates to a bicomponent fiber with a partially supported core and a protective sheath.
Einmaterialfasern haben den Vorteil, daß sie aus dämpfungsarmen handelsüblichen Materialien hergestellt werden können und daß bei ihnen die oft nicht einfache Anpassung der optischen mechanischen und chemischen Eigenschaften enfällt.Single-material fibers have the advantage that they are made from low-attenuation commercially available Materials can be manufactured and that with them the often not easy adaptation the optical mechanical and chemical properties are not applicable.
Ein Nachteil der Einmaterialfasern dagegen besteht darin, daß die numerische Apertur nicht, wie es in manchen Fällen erforderlich ist, genügend groß gewählt werden kann und daß die Bearbeitung und Verbindung der Faserenden relativ aufwendig is-t.A disadvantage of single-material fibers, however, is that the numerical aperture not large enough, as is required in some cases can be chosen and that the processing and connection of the fiber ends relative is expensive.
Die relativ niedrige Begrenzung der numerischen Apertur wird durch das technologisch schwierige Problem der Herstellung der sehr dünnen (ca. 1 bis 2 /um dicken) kerntragenden Halteteile bewirkt, von denen die mumerische Apertur abhängt. Die Probleme der Bearbeitung und Verbindung von Enden der Einmaterialfasern hänger teils mit der nicht-rotationssymmetrischen Führung des Kerns und der Verformung des Faserquerschnittes, die während der Faserziehung entsteht, sowie mit den Hohlräumen um den Faserkern zusammen.The relatively low limitation of the numerical aperture is due to the technologically difficult problem of producing the very thin (approx. 1 to 2 / um thick) core-bearing holding parts, of which the mumeric aperture depends. The problems of processing and joining ends of single-material fibers hanger partly with the non-rotationally symmetrical guidance of the core and the deformation the fiber cross-section, which is created during fiber drawing, as well as with the cavities around the fiber core.
Aufgabe der vorliegenden Erfindung ist es in erster Linie Zwelkomponentenfasern anzugeben it verbesserter numerischer Apertur.The object of the present invention is primarily two-component fibers specify it with improved numerical aperture.
Erfindungsgemäß wird zur Lösung dieser Aufgabe vorgeschlagen, daß das Material der kerntragenden Halteteile einen niedrigeren Brechungsindex als das Material des Kerns aufweist.According to the invention it is proposed to solve this problem that the material of the core-bearing holding parts has a lower refractive index than that Has material of the core.
Durch die Wahl eines kerntragenden Materials mit niedrigerem Brechungsindex als derjenige des Kernmaterials ist es möglich, bei unveränderten Dämpfungseigenschaften vor allem eine Verbesserung der numerischen Apertur zu erreichen. Eine technologische Vereinfachung des Herstellungsverfahrens von Einmaterialfasern besteht darin, daß für die kerntragenden Halteteile größere und damit leichter herzustellende Dicken zugelassen werden können.By choosing a core-bearing material with a lower refractive index than that of the core material, it is possible with unchanged damping properties above all to achieve an improvement in the numerical aperture. A technological one Simplification of the manufacturing process of single-material fibers consists in that larger and therefore easier to manufacture thicknesses for the core-bearing holding parts can be admitted.
Im folgenden wird die Erfindung anhand der Figuren beispielsweise beschrieben, in denen schematisch verschiedene Querschnitte durch erfindungsgemäße Zweikomponentenfasern dargestellt sind.In the following the invention is illustrated by way of example with reference to the figures described in which schematically different cross-sections through the invention Bicomponent fibers are shown.
In den Figuren ist mit 1 die den mechanischen Schutz bewirkende Hülle der Zweikomponentenfaser bezeichnet und mit 2 der die Lichtwellen führende Kern mit dem Brechungsindex nK. Die Faser ist üblicherweise mit Hchlräumen versehen, in denen sich Luft mit dem Brechungsindex nL befindet. Bei einem ersten Ausführungsbeispiel ist erfindungsgemäß der Kern 2 von drei symmetrisch angeordneten Halteteilen 3, 4, 5 getragen, deren Brechungsindex nH niedriger als derjenige des Kernmaterials nK ist.In the figures, 1 is the shell effecting the mechanical protection denotes the bicomponent fiber and with 2 the core that guides the light waves with the refractive index nK. The fiber is usually provided with spaces, in which there is air with the refractive index nL. In a first embodiment is according to the invention the core 2 of three symmetrically arranged holding parts 3, 4, 5 worn, whose refractive index nH is lower than that of the core material nK is.
Durch die Verwendung von drei Halteteilen wird eine Verformung der Querschnittsgeometrie vermieden.By using three holding parts, the Cross-sectional geometry avoided.
Andere mögliche Querschnittsgeometrien sind in den Figuren 2, 3 und 4 schematisch dargestellt, wonach bei dem in Figur 2 gezeigten Ausführungsbeispiel nur ein kerntragendes Halteteil erforderlich ist. Bei dem in Figur 4 dargestellten Ausführungsbeispiel sind die kerntragenden Halteteile mit der Schutzhülle zu einem Bauteil II vereinigt. Dadurch wird der Vorteil der höheren Leistungseinkopplung erzielt.Other possible cross-sectional geometries are shown in FIGS. 2, 3 and 4 shown schematically, according to which in the embodiment shown in FIG only one core-bearing holding part is required. In the case of the one shown in FIG Embodiment are the core-bearing holding parts with the protective cover to one Part II united. This has the advantage of higher power coupling achieved.
Als iaterialkobinationen für die erfinuungsgemäBen Fasern eignen sich z.B. für den Kern Suprasil W oder Ge-dotierter Quarz und für das kerntragende Material Borsilikat bzw. dämpfungsarmer Quarz, wie z.-B. "Spectrosil WF".As material combinations for the fibers according to the invention suitable E.g. for the core Suprasil W or Ge-doped quartz and for the core-bearing Material borosilicate or low-attenuation quartz, such as e.g. "Spectrosil WF".
3 Patentansprüche 4 Figuren3 claims 4 figures
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752519062 DE2519062A1 (en) | 1975-04-29 | 1975-04-29 | Two component fibre with partly supported core - has mechanically protective covering and larger numerical aperture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752519062 DE2519062A1 (en) | 1975-04-29 | 1975-04-29 | Two component fibre with partly supported core - has mechanically protective covering and larger numerical aperture |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2519062A1 true DE2519062A1 (en) | 1976-11-11 |
Family
ID=5945315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19752519062 Pending DE2519062A1 (en) | 1975-04-29 | 1975-04-29 | Two component fibre with partly supported core - has mechanically protective covering and larger numerical aperture |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2519062A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520519A1 (en) * | 1982-01-26 | 1983-07-29 | Cables Electro Telecommunicati | Protective cable carrying optical fibre - consists of sleeve with flat diametral reinforcing strip of similar expandability as optical fibre and resistant to stress |
-
1975
- 1975-04-29 DE DE19752519062 patent/DE2519062A1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520519A1 (en) * | 1982-01-26 | 1983-07-29 | Cables Electro Telecommunicati | Protective cable carrying optical fibre - consists of sleeve with flat diametral reinforcing strip of similar expandability as optical fibre and resistant to stress |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OHJ | Non-payment of the annual fee |