DE2554958C2 - Method for adjusting an optical fiber - Google Patents

Description

45

Adjustment devices are already known for connectors of optical fibers, in which at one end light is coupled into the fiber and the light output is measured at the other end of the fiber. With this one Procedures are 2-3 people for a fiber optic link necessary, which is very time-consuming.

The invention has therefore set itself the task of providing a method for adjusting a core cladding optical fiber to point in the center of a connector part provided with a corresponding recess, which is easy to carry out and therefore useful for assembly. There should also be a simple Compensation of the eccentricity of the core within the cladding of the optical fiber surrounding it is possible t> o be.

According to the invention, this is achieved in that light is coupled into the cladding shortly before the fiber end and while observing the fiber end in a microscope or on a screen, the fiber (1) is like this is twisted for a long time until its core, which is dark against the jacket, is in the center of the plug part lies, whereupon the fiber end is locked.

The invention is to be explained briefly on the basis of the exemplary embodiment shown in the figure.

5 with a connector part is shown schematically, which is intended to receive the optical fiber. In the illustrated embodiment, it has a V-shaped guide groove 6 with an opening of preferably 90 °. The fiber 1, consisting of the core and the jacket, is inserted into a ground truncated cone 2, which has a groove 3 that is also V-shaped. This groove is designed so that the center of the inserted fiber 1 comes to lie somewhat outside the center of the truncated cone. The distance a between the axis M 2 of the truncated cone and the axis MX of the fiber is preferably about 100-200 μm with a bevel diameter of 100 μm. The fiber 1 is firmly embedded in the groove 3 mentioned. The ground truncated cone 2 is attached within the inner bore of a hollow body 4 which is cylindrical on the outside. The inner bore is conical and also arranged somewhat outside the center Λ / 3 of the hollow body 4. The offset of the axis M 2 with respect to the longitudinal axis M 3 of the cylindrical hollow body 4 is also approximately 100-200 μm. It is denoted by b in the figure.

By rotating part 2 relative to part 4, the optical fiber 1 inserted into the V-groove 3 can also the center of the plug part 5 can be adjusted. Since the truncated cone 2, which is rotatably mounted in the hollow body 4 has a conical shape corresponding to the bore of the hollow body 4, can after Adjustment of the axis of the optical fiber these are locked in their end position in that the truncated cone 2 is pressed into the inner bore of the hollow body 4.

For some applications it is advantageous if the arrangement is designed so that the fiber is not exposed to torsional forces. This can be achieved by between the truncated cone 2 and the hollow body 4 a further cylindrical hollow body is arranged, which has a conical inner bore has for receiving the truncated cone 2. The inner bore of the further cylindrical hollow body is arranged centrally to its outer diameter. The adjustment is carried out with one designed in this way Arrangement by rotating part 4 relative to the further cylindrical hollow body in the figure Was not shown for the sake of simplicity. In order to ensure the most precise adjustment possible, care must be taken it is important to ensure that the outer diameter of the respective outer body has a higher cylindrical profile Has goodness.

If the optical fiber is adjusted in the desired manner, it can be used depending on the intended use can be used fixed or pluggable.

Before making such a connection, it is advisable to use the V-profile and the fiber end Ultrasonic cleaning so that the quality of the required optical coupling is not caused by foreign bodies is affected.

The method according to the invention and the arrangement for carrying it out make it possible in a simple manner Establish a connection that can be loosened without readjustment.

1 sheet of drawings

Claims (6)

Patent claims: 1. A method of aligning a kern-clad optical fiber in the center of one with a corresponding recess provided connector part, this fiber, which is in the V-groove of a ground truncated cone is attached somewhat eccentrically, relative to an externally cylindrical Hollow body with an internally conical bore that is also slightly off-center can be rotated, characterized in that light is coupled into the cladding shortly before the fiber end and while observing the fiber end in a microscope or on a screen the Fiber (1) is twisted until its dark core, which stands out against the cladding, in the center of the Plug part (5) lies, whereupon the fiber end is locked. 2. Arrangement for performing the method according to claim i, characterized in that the The plug part (5) has a V-shaped guide groove (6), the opening of which is preferably 90 °. 3. Arrangement according to claim 2 with a fiber diameter of about 100 μπι, characterized in that that the truncated cone (2) has a V-shaped groove (3) designed in such a way that the Center of the inserted fiber (1) about 100-200 μm lies outside the axis of the truncated cone (2). 4. Arrangement according to claim 3, characterized in that the inner bore of the cylindrical jo Hollow body (4) is attached about 100-200 μπι outside the axis of the hollow body. 5. Arrangement according to claim 4, characterized in that between the truncated cone (2) and Hollow body (4) a further cylindrical hollow body is provided with a conical inner bore, the Inner bore is central to its outer diameter. 6. Arrangement according to one of the preceding claims, characterized in that before the Assemble the parts are cleaned by ultrasound.