CS254030B1 - Optical cabel and method of its production - Google Patents

Description

254030 4

Finally, the construction of an optical cable is known, whereby the optical fiber with the secondary insulation (protection) is wound with glass cords which form a protective and resistive layer on which the outer shell is applied.

These solutions have a number of disadvantages in addition to their advantages. As a common disadvantage, the complexity of the structure, its multiplicity, and the manufacturing complexity of its construction can be cited. The construction with a loose-laid optical fiber is disadvantageous in terms of con- struction where the free movement of the optical fiber causes considerable problems. The construction of the fiber deposit in the screw-like slots is disadvantageous because of its technically demanding manufacturing of the extrusion of the slotted profiles of the support element, but it is also necessary to have technologically demanding and complicated devices for accurately positioning the optical fiber in the slots. These cables are also complicated.

The cable construction where the powder protective layer does not protect the thrust, but only remains radially stressed with the provision of centric-optical fiber. The combined fiber and toughening layers are complicated in terms of material composition and technology. Structures with high mechanical strength support elements on which they are screwed. "" D. di-dii-2. dz. di + 2. D. da - 2. d22 and on which protective layer there is a circumferentially formed jacket. The protective layer consists of two parts, the composite glass fiber or cords in the lower part being parallel to the regular twist S-Z in the axis of the optical cable, while the composite glass fibers or cords in the upper part of the protective layer are parallel to each other and parallel to the axis optical cable.

The essence of the method of manufacturing the optical cable of the invention is that it initially guides the optical fiber into the dispensing apparatus, then, at least one layer of glass fiber or cores is deposited centrally over the circumference by means of a guide such that it is parallel to the same fifth, wherein the difference in their tensile strength is equal to or less than 7% of the value of the mean low tension, and finally the composition is stabilized by extrusion of the insulation thereto. The composite glass fibers or cords are deposited in one layer so that they are parallel to each other and parallel to the axis of the otpic cord. The composite glass fibers or cords are deposited simultaneously in two portions of the protective layer, wherein the glass fibers or cords of the lower layer of the layer are guided by a guide parallel to each other and are periodically picked up by + 90 to about the cable axis. 180 [deg.], While the optical fiber, respectively. constructions combined with conductors (both electric and optoelectric) are advantageous where the outer diameter of the cable or the cable does not matter. requires extremely mechanical properties on underwater cables and the like. These designs alone are flexible. Their manufacturing technology consists of several operations, is discontinuous and the cables are not suitable for short and medium distances. There are known designs of optical cables, where the optical fiber is wrapped with glass cord, has the disadvantage that the winding wrap is an optical fiber loaded and shortened. This creates a danger of microcracks in the optical fiber, which up to 100% increases the loss of transmission optic signal. At the same time, the number of glass cords is determined by emiration, which is reflected in the two- or three-fold oversizing of their number.

The above-mentioned disadvantages of the present invention are solved by the invention - the construction and method of manufacturing an optical cable. The essence of the construction of an optical cable is that the core of the secondary fiber optic fiber is circumferentially symmetrically lined with parallel glass fibers or cords which it forms at least one protective layer, the number of glass-fiber fibers or cords of which meets the condition of - 2.9-th composite glass fibers or cords of the upper layer of the layer guided parallel to each other and parallel to the optical axis. An advantage of the solution according to the invention is that it simplifies the whole construction of the optical cable and thus its production. The speed is increased by up to one order of magnitude (previously 2.5 to 5 m / min, now 50 m / min.) The optical fiber protective sleeve is formed in a single technological operation, while at the same time the center is an optical fiber without being mechanically stressed. This substantially increases the flow of production. The mathematical model of the construction made it possible to determine precisely the number of glass fibers to be assembled, respectively. cords and thereby prevent oversizing. This is reflected in the size of the outer diameter and its flexibility. It is also beneficial to be able to connect without optical fiber movement. In particular, it is achieved while maintaining the prescribed mechanical properties (resistance to tensile, wear and shock). An indisputable advantage is the fact that the production can run on the known cabling machines with minimal modification and the protective layer is with the available materials. This is also reflected in the economic efficiency of the proposed solutions.

In the accompanying drawings, an exemplary embodiment of an optical cable is shown in a sequential line, wherein in Fig. 1 there is an optical cable with a single layer and in Fig. 2 an optical cable of the invention is provided with a protective layer in two parts.

A description of a particular embodiment is set forth in the following examples. Přikladl

Optical cable with one protective layer / composite glass fiber.

On its manufacture, the glass fiber fibers in the total number of 54 fibers were used, which are guided parallel and symmetrically over the periphery of the free-flowing optical fiber into the discharge machine. The centricity of the optical fiber is guaranteed by a uniform, poor tensile of the composite glass fibers, the difference in tensile strength of which is equal to 5% of the mean tensile value. Optical fiber with secondary fluoroplastic protection (TEF-ZEL j diameter di = 0.6 mm is loosely fed into the head of the dispensing machine. Between the equally stretched parallel glass fibers laid parallel to each other) Finally, the necessary fiber layer is applied to the extruder using a pressure tool, and the optical cable is then wound onto the coils after cooling in the cooling zone. which are formed by laminating 4 to 5 glass fibers in a total of 54 pieces.

Optical cable with protective layer in two parts of composite glass fiber. D. di - d2 - 2. d2. di + 2. D. d2 - 2. d22 d22 1.86 where n is the number of associated glass fibers or cords, D is the inner diameter of the optical cable jacket (connector), and d is the outer diameter of the optical fiber

The composite glass fibers in the total number of 54 fibers are fed directly into the dispensing apparatus in two positions through guides, which ensure that the composite glass fibers are deposited so that the optical fiber remains in the center. Further, the centricity of the optical fiber in the core of the cable is ensured by adjusting the uniform poor tensile of the associated fibers, where the difference must not be greater than 7% of the mean low tensile value. absolutely free. Thus, between the evenly stretched conjugated glass fibers centered on the circumference, the optical fiber is always centered. The composite glass fibers are parallel to each other. the periphery of the optical fiber is centered with a periodically repeating S-Z twist. This is accomplished by periodically deflecting the composite glass fiber guide of + 90 to 180 [deg.] With respect to the optical cable. The composite glass fiber portion of the protective layer is guided parallel to each other and parallel to the optical cable. Finally, a PVC coating is applied to the extruder.

The proposed method of manufacturing an optical cable, wherein the optical fiber is drawn into the center by uniformly stretched lining glass fibers or cords, increases the substantial productivity while maintaining the required protective functions, resistance to both tensile and radial stresses. Stretching the optical cable to the radial pressure leads to so-called spillage of composite glass fibers, respectively. cords, thereby crushing this pressure into negligible constituents from the point of view of the optical fiber, and at the same time ensuring that at least in the one-layered glass fiber or cordy the optical fiber. This condition is fulfilled if the number of glass fibers or cords is determined to satisfy the aforementioned condition: (D2 - d22) 2.9 d22 the average diameter of the composite glass fiber, respectively. cord.

The solution according to the invention can also be applied to the production of multicore optical scales. t>

Claims (5)

254030 7 8 SUBJECT MATTER An optical fiber optic cable made of composite glass fibers or cords under a circumference formed by a sheath, characterized in that the secondary fiber optic fiber core (1) is circumferentially symmetrically lined with parallel composite fibers. or cords which form at least one protective layer (2), the number of associated glass filaments or cords (nj satisfying the condition 1.86 D. di - d 2 - d 2 - d 2 - d. d2dz2 '(D2 - d22) 2.9 dz2 where d is the inner diameter of the optical fiber sheath, d1 is the outer diameter of the optical fiber with secondary protection, d2 is the outer diameter of the composite fiber or cord. 2. Optical cable according to claim 1, characterized in that the protective layer (2) consists of two parts, wherein the composite glass fibers or cords of the lower part (21) of the protective layer (2) are with a regular S-shaped twist. the axis of the optical cable, while the composite glass fibers or cords of the upper portion (22) of the protective layer (2) are parallel to each other and parallel to the axis of the optical cable. 3. A method of manufacturing an optical cable of sub-section 1, characterized in that firstly the optical fiber is guided into the head of the dispensing machine, then at least one layer of fiber glass or strips is deposited in at least one layer by means of a guide such that parallel conduction occurs. with equal tension, wherein the difference in their elevations is equal to or less than 7% of the mean low tensile value, and finally their deposition is stabilized by extrusion of the insulation directly thereto. 4. Process according to claim 3, characterized in that the composite glass fibers or cords are laid in one layer so that they are parallel to each other and parallel to the axial axis of the optical cable. 5. Production method according to claim 3, characterized in that the composite glass fibers or cords are deposited simultaneously in two portions of the protective layer, wherein the composite fibers or the cords of the lower protective layer are guided parallel to one another and guide the axis of the optical cable through a guide periodically deflected by + 90 ° to 180 °, while the composite fibers or cords of the upper layer of the protective layer are simultaneously parallel to each other and parallel to the axis of the optical cable. 1 sheet of drawings