Optical fiber with color-coded

 

(57) Abstract:

Optical fiber with a color marking is used to provide recognition of the fibers during splicing. The optical fiber includes a core, which is applied to the floor. consisting of single or multiple layers of synthetic material. The outer layer of synthetic material applied or embedded in this layer the color coding. The color coding is covered with a layer of transparent or translucent lacquer over the entire length of the fiber. Increased resistance of the marking. 18 C.p. f-crystals, 3 ill.

The invention relates to optical fiber having a core, a deposited coating of a single layer or laminated layers of synthetic material and colour marking on the outer layer of synthetic material or embedded in this layer.

Fibers of this type are fairly well known, in particular from the description of the applications EP-A-0155092 and EP-A - 0562259. To isolate the fibers from each other and recognize when splicing or connecting fibers at their outer shell of synthetic material applied color-coded rings, for example, cured under the action of infrared (IR) radiation sentencestructure (UV) radiation. Color coded fibers are required for further work with them, for example, when placed in an electric or optical cables in protective tubes made of synthetic material or of steel, or for the manufacture of such fiber conductor ribbon cable. Practiced nowadays the traditional application of color coding, for example, a marking of the rings, using the curable under the action of infrared radiation materials do not always meet the relevant requirements, in particular regarding the strength, wear. Due to the heterogeneity and surface roughness of the fibers caused by the application of the usual markings in the form of rings may cause problems in subsequent process operations with these fibers and, in addition, it is often not possible to avoid increasing the degree of attenuation of the signal on the optical transmission path when the temperature changes. The color coding in the form of bars or strips may also have some disadvantages, such as marking requires increased maintenance cost and it is often difficult to distinguish.

During the transition taking into account the growing demand for optical transmission paths to use ka is desta for the simple reason, today there is no paint that would provide quite a strong and contrasting markings. This applies equally to the optical fibers, made of glass, for example, of quartz glass, as well as for finding increasingly wide application and is used for a particular transmission path fibers from synthetic materials.

At the same time from the prior art known attempts to protect color coded from scratch by creating a layer of protective coating, such as described in applications of France 2688928 and 2686185 applied to the color marking on the cables. However, to draw on this experience to save the color coding of the optical fiber due to significant technical differences is not possible.

Proceeding from this prior art, the invention was based on the task to provide a clear unambiguous marking any number of fibers and along with this to achieve the preservation of such marks caused during the manufacturing process, regardless of the characteristics of subsequent technological operations. Selected colour marking should also not adversely hcpa is Yu optical fiber, containing the core, a deposited coating consisting of a single layer or laminated layers of synthetic material, and the colored mark on the outer layer of synthetic material or embedded in this layer. According to the invention, the color coding is covered with a layer of transparent or semi-transparent colored lacquer over the entire length of the fiber.

Preferably, the thickness of the layer of colored lacquer was 1-10 μm, preferably 3-6 μm.

In one case, a colored varnish is a UV-curable lacquer. In another case, as a colour varnish applied IR-curable lacquer.

Preferably transparent or semi-transparent colored lacquer to perform based on polyimides, polyesters, polyether, polysulfone, or polyurethane.

Through appropriate choice of materials used for applying a layer of colored lacquer, provided its high strength properties. This means that the increased mechanical load, it is often inevitable during subsequent technological operations with fibers that do not adversely affect the optical properties of the light guide; on the contrary, it can be noted even improving your gear is with as to further protect the fiber surface against moisture and solvents, and that means made in accordance with the invention, fiber, open the future possibility of using optical transmission equipment. Thus, by applying a transparent or translucent layer of colored lacquer according to the invention directly after the manufacture of fibers, i.e., to the subsequent technological operations with fiber, any colour marking protected from mechanical damage.

The most appropriate marking on the optical fiber to be applied in the form of rings. In this case it will be the best for marking to apply the IR-curable varnish, and applying a layer of colored lacquer to apply a UV-curable lacquer. When this marking is in the form of rings as additional marking may be applied on already dyed fiber. It is very important for the purposes of the invention to choose the correct thickness of the color layer marking. For marks in the form of rings, the thickness of the specified layer is 0.5-5 μm, preferably 1-3 μm.

The labels may be in the form of rings of the same color along the length of the fiber at different distances from each other.

The labels may be in the form of rings of different tvline fiber at the same distance from each other.

And finally, marking rings can be made of a combination of different colors, and is located on different rasstoyanij from each other along the length of the fiber.

It is also advisable colored marking on the fiber to be applied in the form of passing in the longitudinal direction of the bars or strips. While this label may be embedded in the outer layer of the coating.

It is desirable for the production of color coding to use IR-curable lacquer. But you can apply for this UV-curable lacquer. However, preference is given to using lacquer curable by ultraviolet radiation, having compared with IR-varnishes higher viscosity and therefore especially suitable for coating a uniform, smooth layer underneath the fibers in the shell with applied color labeling.

Offer in accordance with the invention, the optical fiber preferably be made of glass, in particular quartz glass.

In some cases, an optical fiber made of a synthetic material.

Hereinafter the invention is explained in detail by the description of examples with reference to Fig. 1-3 of the accompanying drawings.

Ancestors, has a so-called protective coating 2 of a single-layer or laminated layers of synthetic material designed to protect the fiber 1. Directly on this protective coating 2 applied the color coding in the form placed at a certain distance from each other colored rings 3, made of IR or UV varnish. The thickness of the colored rings in the present exemplary embodiment is 3-4 μm. By the same value colored rings 3 protrude above the surface of the protective cover 2 and, thus, for subsequent technological operations with the fiber necessary to consider the possibility of mechanical abrasion of colored rings marking. To reliably prevent such abrasion according to the invention provides a transparent or translucent layer 4 colour varnish covering is equipped with color-coded fiber along its length. Material for this coating layer 4 color nail Polish is used, for example, UV - curable lacquer on the basis of polyimide or polyurethane, which apart from being a coating for color rings 3, fills the area 5 between each two adjacent rings, respectively. In a given thickness colored rings equal to 3 μm, the DOI adjacent pair of rings 3 is filled with material, which is made from the top layer. In this way protect the colored markings along the length of the fiber.

In the described exemplary embodiment colored rings 3 are the same distance apart; this distance may, of course, vary. Exactly the same markings as colored rings 3 can be applied on already dyed fiber.

Other color combinations and thus other possibilities to identify fibers get in the case when according to the invention the covering layer 4 is performed in color or paint, for example, when it is made paramaka. Thus, in particular, single or double marking ring 3 black or blue color of the IR-curable varnish may be covered with a layer of 4 colored lacquer, painted in yellow, red, blue or green in color and is made preferably from a UV-curable varnish having a higher viscosity. Colored single or double marking ring 3 is easy to recognize, because the color coating layer 4 of varnish in accordance with the invention is made at least semi-transparent. The choice of contrasting colour combinations facilitates the identification of labeled fibers.

In contrast to Fig. 1 the second marking. This colour marking is a located in the longitudinal direction of the strokes or strip 8 of any color, and the labeling is applied or, as shown in the drawing, directly on the shell 7, or, if on the shell 7 is applied along the length of the fiber uniform marking layer or if the shell itself is painted over the top of the shell. As colored rings 3 in Fig. 1, a marking strokes or strip 8 can protrude above the surface of the shell 7, made for example of synthetic material, but, on the other hand, those strokes and stripes can be integrated into a synthetic membrane material. In all cases, to protect the color coding and reliable insulation fibers from contact with each other, including multi-conductor cables of optical fibers with any marking configuration provided by the coating 9 is made, for example, from the lacquer on the basis of complex or polyethers. This varnish can be a again non-pigmented lacquer or, as already explained in Fig. 1, the translucent forblack.

In Fig. 3 presents an embodiment of the invention in which the optical fiber 10 as mentioned above is made of glass or synthetic matasano floor, which directly or on a continuous covering of the fiber throughout the length of the colored intermediate layer, are color coded. In the present exemplary embodiment, this label is a placed at a certain distance from each other, the bars or strips 12, if necessary, of different lengths, but recurrent, having a certain thickness and consequently protruding above the surface of the shell 11. These lateral stripes or lines, including and subject to their possible placement at a different distance from each other, put a layer 13 of lacquer covering the optical fiber along its length and thereby reliably protecting these marking lines or strips 12 from abrasion. For achievements in the process uniform varnish layer it is advisable to use, for example, UV-curable lacquer, in particular on the basis of polysulfone, or polyurethane, which completely fills the gaps 14 between two adjacent bars or strips 12 and which primarily ensures the stability of the colored marks in the applied form, i.e. its definition, primarily in regional areas.

Another differentiation certified yet what's blak, the hue which contrasts sharply with underneath it colors or color combinations.

1. Optical fiber containing a core, a deposited coating, consisting of single or multiple layers of synthetic material, and the colored mark on the outer layer of synthetic material or embedded in this layer, characterized in that the color coding is covered with a layer of transparent or semi-transparent colored lacquer over the entire length of the fiber.

2. Optical fiber under item 1, characterized in that the thickness of the layer of colored lacquer (4) is 1 to 10 μm, preferably 3 to 6 μm.

3. Optical fiber under item 1 or 2, characterized in that a colored lacquer (4) is a UV-curable lacquer.

4. Optical fiber under item 1 or 2, characterized in that a colored lacquer (4) represents the IR-curable lacquer.

5. Optical fiber under item 3 or 4, characterized in that the transparent or semi-transparent colored lacquer is made on the basis of polyimides, polyesters, polyether, polysulfone, or polyurethane.

6. Optical fiber under item 1, characterized in that the color marking (3) is applied in the form of rings.

7. The optical fiber is the basis of the layer of colored lacquer (4) - UV varnish.

8. Optical fiber under item 6, characterized in that the marking is in the form of rings as additional marking applied on already dyed fiber.

9. The optical fiber according to any one of paragraphs.6 to 8, characterized in that the thickness of the color layer marking in the form of rings is 0.5 to 5.0 μm, preferably 1 to 3 μm.

10. The optical fiber according to any one of paragraphs.6 to 9, characterized in that the marking is applied in the form of rings of the same color along the length of the fiber at different distances from each other.

11. The optical fiber according to any one of paragraphs.6 to 9, characterized in that the marking is applied in the form of rings of different colors.

12. The optical fiber according to any one of paragraphs.6 to 9, characterized in that the marking is applied in the form of rings are the same or different colors along the length of the fiber at the same distance from each other.

13. The optical fiber according to any one of paragraphs.6 to 9, characterized in that the marking is in the form of rings made of a combination of different colors and located at different distances from each other.

14. The optical fiber according to any one of paragraphs.1 to 5, characterized in that the color marking (3) is applied in the form held in Provo in the form of bars or strips embedded in the outer layer of the coating.

16. The optical fiber according to any one of the preceding paragraphs, characterized in that the color marking (3) is made of IR-curable lacquer.

17. The optical fiber according to any one of paragraphs.1 - 6, characterized in that the color marking (3) made of UV-curable lacquer.

18. The optical fiber according to any one of paragraphs.1 to 17, characterized in that it is made of glass, in particular quartz glass.

19. The optical fiber according to any one of paragraphs.1 to 17, characterized in that it is made from synthetic material.

Priority points:

05.03.1994 on PP.1 and 7;

23.12.1993 on PP.2 - 6, 8 - 19.

 

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