DD279751A1 - METHOD FOR PRODUCING A SHAFT COUPLER - Google Patents

Abstract

The invention relates to a method for producing an element for the coupling of monomode or multimode optical fibers to a planar waveguide branch. The method allows a simplified production and guarantees a high adjustment accuracy and optimal coupling. The method consists of introducing into the surface of a plate at the branching angle grooves which are inclined relative to one another at the branching angle and which receive the optical fibers. Thereafter, the plate is so zersaegt that the optical fibers ensure a straight continuation of the waveguide of the splitter. The spacing of the waveguides at the saw stand is slightly less than the spacing of the waveguides at the output of the splitter. Subsequent fine machining of the end surfaces created by sawing ensures a consistent distance and thus optimal coupling. Subsequently, the element is glued to the branch.

Description

Run end face of the component and the trenches generated in a carrier substrate for receiving the optical fibers to be coupled extend at the same angle.

The spacing of the strip waveguides of the branching component is determined on the end face of the component. The optical fibers are inserted into the trenches of the carrier substrate and fixed therein.

The realization of the distance of the strip waveguide corresponding distance of the optical fibers is effected by fine optical processing of the carrier substrate end face.

embodiment

The invention will be explained below with reference to an embodiment. The figures in the drawing show the sequence of erfindungsgemä'jen method.

In a planar branching device (FIG. 1), two strip waveguides 2, 3 extend at the angle α as far as the end face 1 'of the component. The distance of the end faces 2 'and 3' of the strip waveguide is measured by means of a microscope with eyepiece micrometer. In a consisting of a glass substrate plate 4 (Figure 2) by means of a diamond disc two trenches 5 are sawn, which extend at an angle α to each other and whose width and depth correspond approximately to the outer diameter of the optical cladding of the optical fibers. The only provided with their optical clad optical fibers 6 are inserted into the trenches (Figure 3) and potted with Optikkitt in them. A cover plate 7 serves to better F'xierung the optical fibers in the trenches.

The plate 4 is sawn at the point 4 ', so that the distance you the optical fiber stop faces b is still slightly smaller than the distance of the strip waveguide end faces a. The end face 4 'is then finely ground until the distance b is equal to the distance a. The measurement of b is done with a microscope with eyepiece micrometer. The end face 4 'is polished optically. Finally, an adjustment of the end face 4 'to the end face V to the effect that a maximum overcoupling of the light coupled into the end face E light is realized on the optical fibers 6. The end faces 1 'and 4' are glued with Optikkitt.

In branching devices with 4 even higher outputs, the optical fibers according to the embodiment are coupled in each case to 2 outputs and thus achieve a more optimal and less complicated adaptation than if a coupling element coupled to a total number of outputs corresponding number of optical fibers

Claims (1)

Method for producing an element for the coupling of monomode or multimode optical fibers to a planar waveguide splitter, characterized in that in the surface of a plate whose cross section corresponds approximately to that of the Vera veiger component, at the branch angle against each other; Broite and depth about the outer diameter of the optical fibers corresponding grooves are introduced so that they touch at one end of the Piattefast, inserted into these grooves light guide and are held therein by casting, then the plate is so sawn that the optical fibers a straight continuation ensure the waveguide of the splitter and that the distance of the optical fiber cores to the saw frame is slightly less than the distance of the waveguide at the outlet of the splitter that a fine machining of the resulting end of the sawing of the element is carried out until the distance of the L ichtleitfaserkerne corresponds exactly to the waveguide and that then the element is glued with dom branching. For this 1 page drawings Field of application of the invention The invention relates to a method for producing an element for the coupling of monomode or multimode optical fibers to a planar waveguide branch. Such planar waveguide splitters are mainly used in fiber optic transmission. Also for the information transmission in automation technology, the application of such elements is of importance for the construction of so-called data bus systems. Characteristic of the known technical solutions Methods for the production of elements for the coupling of optical fibers to waveguides are already known. The problem of the exact and complete coupling to be transmitted in the case was attempted by introducing into a bubstrate containing the waveguide a pit corresponding to the outer diameter of the cladding of the optical fiber or a corresponding cut (Of iical Lbers, vol.9, p.463, Oct. 1984). The pits for the optical fibers were produced, for example, by etching in silicon (Journal of Jptical Communications, vol.2, p.122, Nov. 1981. In this case, it is necessary to structure the silicon substrate with an etching mask, another variant of the trench generation is the Sawing parallel grooves in a glass substrate. The optimal coupling of optical fibers to strip waveguides requires a high adjustment accuracy with respect to the end faces of the optical fibers to the end faces of the strip waveguide. With the described method, this alignment accuracy can not be realized reliably, since in this case the trenches generated in a carrier substrate can be adapted to the cross-section of the optical fiber in their cross-section, but an exactly zontrische position of the Lichtleitfaserkernt in the optical jacket vcrausges' - It must be, but this is not guaranteed by the manufacturing tolerances in the production of optical fiber. Object of the invention The aim of the invention is to simplify the manufacture and increase the quality of elements for the coupling of optical fibers to planar waveguide splitters. Explanation of the essence of the invention The invention has for its object to provide a method by means of which can be done with a high Justiergenauigkeit, without major structuring effort and with simple fine-optical work in relation to the continuous light output optimal coupling of optical fibers to branched strip waveguide. The solution of this object is achieved with a method for producing an element for the coupling of mono-optic or multimode optical fibers to a planar Wellenleiterverzweiger, according to the invention characterized in that in the surface of a plate whose cross-section corresponds approximately to that of the branching element under the Branching angle against each other inclined, in their width and depth about the outer diameter of the optical fibers corresponding grooves are introduced so that they almost touch at one end of the plate are inserted into these loud optical fibers and fixed therein, that subsequently the plate is separated so that the optical fibers ensure a straight continuation of the waveguide of the splitter and that the distance of the Lichtleitfaserkerne at the separation point is slightly less than the distance between the waveguide at the output of the splitter that a Feinbearbeitu ig of the resulting end of the separation The surface of the element takes place until the distance of the Lichtleilfasernkern cores corresponds exactly to that of the waveguide and that finally the element is firmly connected to the splitter 'essential is al; j, oaß the strip waveguide of the Verzweigerbauelementses at its branching angle to the