Fiber optic module

 

(57) Abstract:

Usage: fiber-optic communication lines. The inventive module contains fiber light guide with a protective polymeric coating that is placed with a fixed gap in a metal tubular sheath made of a ribbon having longitudinally placed on the seam. The edge of the shell is made with smooth curves. Tape thickness is comparable with the radius of the fibre, plot touch the edges of the ribbon is less than the thickness of the strip at a fixed gap between the optical fiber and a protective shell filled with a hydrophobic material. Over protective shell made additional metallic coating, including above the line touch the edges of the ribbon, the thickness of the coating is less than the thickness of the main metal shell. Top with additional metallic coating applied to the polymer coating thickness of 0.1-0.3 mm 2 C.p. f-crystals, 2 Il. table 2.

The invention relates to electrical engineering, in particular to the field of optical fibers and optical cables, and can be used in the manufacture of communication cables.

Known optical fiber [1] contains the fiber, having a core of transparent to opaline core, as well as a protective shell, which is made of a thin lacquer coating. This thin coating mainly provides the sealing surface of the fiber, which eliminates degradation of the fiber, the deterioration of its mechanical characteristics.

Also known fiber optic or modules [1] in which the optical fiber applied to the primary buffer coating from soft silicone varnish and secondary thick shell of hard polymer type polyamide. Both the shell marked tightly with no gap. Such fiber or the module has a high mechanical strength, but, as a rule, the worst transfer characteristics, because the imposition of a thick polymer shell is hard to avoid microengine deformations. The last cause additional losses in the fiber.

On the other hand, the known optical modules [2] the above structures, containing fiber, placed in a thick plastic tube freely, i.e. without compression and with a stock length (i.e., fiber length somewhat greater than the length of the polymer tube). In this case, the polymer tube performs a basic function, which consists in protecting the fiber from the outer transverse and longitudinal to the key and so the preservation of transmission parameters at the level made directly in the production of fiber. When used in this module fiber, according to the counterpart shown in [1] are able to produce modules with extremely low losses, which are used in fiber-optic communication lines and information transfer. The disadvantage of such a module, but rather the technology should include the fact that the necessary supply of fiber or its rectilinear position is difficult to sustain because of shrinkage phenomena polymer tube after its exit from the head of the press. On the other hand, the presence of a hydrophobic material inside the tube creates two intractable problems: high frost resistance and the need for its compatibility with the polymer material of the coating. The absence of these properties is not possible to create a reliable cold-resistant optical communication cables.

Significant disadvantages of the known optical modules [2] are their large size and high intensity.

For modules [2] a common disadvantage is the occurrence of the additional losses when exposed to high and low temperatures. This is due to the fact that due to the large coefficient of linear elongation of polymeric materials when Waimanalo extensions are much less.

The closest in technical essence to the proposed technical solution should be considered as a fiber optic module [2] used for manufacturing a multi-fiber optic communication cables. This fiber optic module contains fiber light guide with a relatively thick protective polymer coating, is placed in a tubular sheath made of a metal strip having longitudinally placed on the seam, the edges of the shell nonlinear deformed, and the seam after manufacturing span or welded, the ratio of the outer diameter of the optical fiber to the inner diameter of the tubular metal shell more than 6/10.

This module has the advantage that the fiber having a relatively thick polymer coating, additionally protected against external mechanical influences and impacts of moisture.

This disadvantage inherent in the prototype [2] which is also a large mass of thick polymer shell (because on the inside there is a module similar [1]). To the disadvantage of the prototype should also be attributed to the relatively large dimensions for modern quartz fiber with diameter optical sheath 125 μm, the diameter of the secondary is the Technical result of the invention is to improve reliability and reduce material consumption by reducing the geometric dimensions of the module. This saves the high technological quality of the module under which it is necessary to understand the ability of the module to store parameters of the transmission fiber during subsequent process steps involved in the manufacture of the cable and the resistance of the fibers in the finished optical cable to mechanical loads

bending, torsion, transverse and longitudinal pressures and climatic influences. The last factor requires module minimal shrinkage or stretching, to prevent bending or microengine fiber during raising or lowering of the ambient temperature.

The technical result of the invention is the reduction of the dimensions, material consumption without lowering the strength and reliability of the optical module, as well as increased resistance to high or low temperature environment in terms of conservation of the transmission parameters at the level of the original fiber.

The achievement of the technical result according to p. 1 claims, is that the edges of the protective shell is made with smooth undeformed curves, thickness approximately equal to the radius of the optical fiber, the plot touch the edges of the ribbon is less than the thickness of the ω ratio of the outer diameter of the fiber to the inside diameter of the protective sheath less than 0.6.

In the proposed technical solution of the protective sheath made of thin, rolled-up tube of a metal tape, and the tape edge with smooth and rounded, pressed together and sealed design. Increased flexibility of design, achieved in the manufacturing process of the module during negitave sheath material provides a tight seal edges together with a hydrophobic filling the space between the fiber and the protective sheath increases the tightness. The gap between the outer diameter of the fiber and the inner surface of the tube has a fixed throughout the length of such a size that ensures the necessary freedom of the fibers when the temperature of the environment so that bending of the fibers arising from the compression of the metal shell, the increment of the attenuation does not exceed the specified value.

In Fig. 1 shows an optical module made in accordance with the selected prototype.

The module contains the optical fiber 1, consisting of the optical fiber 2 (quartz or any other), lacquer coating 3, a tubular metal shell 4, the edges 5 which are adjacent to each other across the surface.

The module implementation is a metallic tape, rounded edges 5 which are undeformed approaching a semicircle of curvature. The edges of the shell adjacent to each other. Inside the module is a hydrophobic material.

A practical embodiment of such a cable with the fiber having a gradient profile of the refractive index and the characteristic geometrical dimensions of 125 and 50 microns and an external diameter of 250 μm and the thickness of copper tape 70 μm, had a diameter of 430-450 μm. A gap of about 50 μm. Increment attenuation in this module was not observed in the temperature ranges from +80 to -60o.

Thus, the proposed technical solution optical module according to Fig. 2 differs from the module of the prototype Fig. 1, because he has a small geometrical dimensions and ensures the integrity of the fibers in the transverse and longitudinal direction. Geometrical dimensions of the module, if necessary, may be made by others in a fairly wide range from 0.4 to 1.2-1.5 mm.

Version of the proposed technical solutions fiber optic module p. 2 has an additional metal coating, the thickness of which is substantially less than the primary metal protective coating. It can be made of tin, Nickel tightness.

Version of the proposed technical solutions fiber optic module according to p. 3 has an additional polymer coating of polyethylene, PVC skin or any other polymer material with a thickness of 0.10-0,3 mm This coverage provides additional sealing and improves the processing properties of the module, ensuring its adaptability with the twisted multi-fiber cables.

On the basis of the proposed technical solutions of the optical module can be made multi-fiber optical cables.

For example, a possible embodiment of one - and multi-fiber optical cable, which would contain the modules PP 1 or 2 placed inside the polymer tube made of polyethylene or any other material used in the cable industry for protective shells. The cable contains a filling between the outer membrane module and the inner part of the protective cable sheath of the filaments technical glass or high-strength synthetic fibres (SVM). This filling improves the manufacturability of the cable, because these threads increase the slippage of the modules, whereby they are freely suspended inside with some clearance. In these curved. Protection against tensile loads is provided a high-strength threads RAS.

Another option cable involves the twisting of modules made under item 3, around a Central strength element and protection combined external shells.

Option next possible solution involves the stacking of modules on p. 1-2 inside the grooves of the Central load-bearing element, is made by extruding on a steel or stekloplastick rod polymer profile shape in cross section.

Increased strength and less sensitive modules, executed, according to the invention, at PP. 1-3, to mechanical stress can increase the reliability of manufacturing a multi-fiber optical cables while maintaining the transmission parameters at the level of the original fiber.

Such cables have undoubted advantages that arise from the results of comparative tests of basic optical module under item 1 of this decision, and standard fibers from which it is made. These results are shown in table 1.

The results show that the miniature module, made under item 1 of this technical solution with the minimum size of the deposits allow you to create the optical communication cables miniature design, protected from the effects of the major destabilizing factors in the environment of moisture, temperature and mechanical longitudinal, transverse bending loads, including sealed cables used when exposed to high lateral loads, such as submarine cables.

1. Fiber optic module containing the fiber light guide with a protective polymeric coating that is placed with a fixed gap in a metal tubular sheath made of a ribbon having longitudinally placed on the seam, characterized in that the edge of the shell is made with smooth curves, the thickness of the tape is comparable with the radius of the fibre, plot touch the edges of the ribbon is less than the thickness of the strip at a fixed gap between the optical fiber and a protective shell filled with a hydrophobic material.

2. Module p. 1, characterized in that on top of the protective sheath is made of an additional metallic coating, including above the line touch the edges of the ribbon, the thickness of the coating is less than the thickness of the main metal shell.

3. Module p. 2, characterized in that the above additional metal coatings are deposited polymer is

 

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