RU201970U1 - FIBER OPTICAL CONNECTOR - Google Patents

Abstract

The utility model relates to a fiber-optic method of data transmission, in particular to connectors designed for quick mechanical connection and disconnection of optical fibers. A fiber-optic connector is proposed, which consists of a housing with a sleeve and a receiving part, a cap, a bracket, a movable nozzle and a protective ferrule cap. In this case, the receiving part contains a tapered hole, a bar, a shank in the form of a clamp with teeth. The clamp has a length of at least 6 mm, and the number of teeth on each side of the clamp is greater than or equal to 5. The technical result to be achieved by the proposed utility model is to increase the reliability of the fiber-optic connector due to the design of the receiving part of the connector body. An additional technical result is to simplify the process of mounting the connector by allowing the use of a standard cleaver. 4 ill.

Description

The invention relates to a fiber-optic data transmission method, in particular to connectors designed for fast mechanical connection and disconnection of optical fibers.

Known optical fiber connector, in which the optical fiber of the tip, placed in the tip, resiliently held by an elastic element, and the main optical fiber are fused using an apparatus for fusing optical fiber, and the fused section is reinforced with a reinforcing sleeve to form a connection between the main optical fiber and the optical fiber of the tip The connector includes a tip guide bush installed between the tip and an elastic element, while the tip guide bushing, optical fiber and fused section are connected in one piece using a reinforcing sleeve (according to patent RU2598774, class G02B 06/38, publ. 27.09.16).

The disadvantage of this solution is the complexity of assembling the connector with the main fiber, associated with their fusion together.

Known fiber optic connector, consisting of a tail sleeve, an optical fiber splice unit having a rear part connected to the front part of the tail sleeve, a fixing element having one end inserted into the rear part of the tail sleeve, and the other end attached to the end portion of the fiber -optical cable, and an insulating cap mounted on the tail sleeve. The fixing element includes a pair of separate and opposite elastic side tabs having a pair of clamping surfaces facing each other, each of them is made with a projection in the form of a tooth on it, in which the end section of the fiber optic cable is located between a pair of elastic side tabs ... In this case, the inner surface of the insulating cap is made to compress a pair of elastic side legs, where the insulating cap is installed on the tail sleeve so as to facilitate fixing the end section of the fiber-optic cable between a pair of elastic side legs (according to patent RU143329, class G02B 06/38, publ. . 20.07.14).

The proposed technical solution does not fully disclose the structure of the fixing element designed to hold the fiber-optic cable.

Known is an optical type mechanical connector, which consists of a tip including an optical fiber and a cut element holding the tip and an optical fiber protruding from the rear end surface of the tip. Fiber optic cable is inserted from the rear end. The optical fiber of the handpiece rests against the optical fiber of the cable and is clamped by a connecting element (according to patent JP3445479, class G02B6 / 24, G02B6 / 36, G02B6 / 38, publ. 08.09.03).

This optical connector is not compatible with standard connector types and requires field assembly in several parts. Placing multiple pieces in a connector can result in improper connector reassembly, which can result in reduced performance in the transmission path or increase the likelihood of fiber damage.

The closest technical solution adopted for the prototype is a fiber-optic connector, which consists of a housing with a clip, a protective ferrule cap, an optical fiber attachment with a V-shaped clip, a bracket, an outer sheath, a shank (according to patent CN205562886, class G02B6 / 38, publ. 09/07/16).

The disadvantage of this design is the insufficiently long clamping surface for the sheath, this entails an increase in pressure on the sheath of the cable, which increases the likelihood of fiber deformation and, as a consequence, an increase in optical attenuation. This disadvantage is especially relevant when using the connector on intra-facility cables with fiber in a buffer coating, parallel reinforcing threads and a common round sheath. Also, the disadvantage of this design is the small number of locking teeth.

The technical result to be achieved by the proposed utility model consists in increasing the reliability of the fiber-optic connector due to the structural design of the receiving part of the connector body. An additional technical result is to simplify the process of installing the connector by making it possible to use a standard fiber-optic cable cleaver.

The specified technical result is achieved in that the fiber-optic connector consists of a body with a sleeve and a receiving part, a cap, an elastic bracket, a movable nozzle and a protective cap of the ferrule, while the receiving part contains a tapered hole, a bar and a shank in the form of a clamp with teeth, and differs in that the clamp has a length of at least 6 mm, and the number of teeth on each side of the clamp is greater than or equal to 5.

The proposed utility model is illustrated by the following drawings, which show:

FIG. 1 - fiber optic connector;

FIG. 2 - receiving part of the fiber optic connector;

FIG. 3 is a stretching diagram of a typical connector (prototype);

FIG. 4 is a tensile diagram of the proposed connector.

The fiber-optic connector (Fig. 1) consists of a body 1, a cap 2, an elastic bracket 3, a movable nozzle 4 and a protective cap of a ferrule 5. The body 1 has a sleeve 6 with a V-shaped cut and a receiving part 7 (Fig. 2), containing a conical hole 8 for inserting optical fiber into the coupling 6, a strip 9 with a cylindrical cut that prevents the passage of the outer sheath of the fiber-optic cable (not shown in the figure), a shank 10 in the form of a clamp 11 with teeth 12. To separate the V-shaped cut of the coupling 6, the spreading bracket is used 13.

Application

Before installing the connector, it is necessary to remove the outer sheath at the end of the cable (chipping). Then the cable is threaded through the cap 2 and inserted into the shank 11. The optical fiber is inserted into the tapered hole 8 until the outer sheath of the cable stops in the bar 9. The optical fiber is fixed in the V-shaped cut of the coupling 6 using an elastic clip 3. The cap 2 is screwed along the thread onto the body 1, squeezing the clamp 11, which, thanks to the teeth 12, fixes the outer sheath of the cable.

During the use of fiber optic connectors, there are high risks of exposure to pulling mechanical influences, as a result of which the position of the optical fiber in the corresponding V-shaped notch of the connector sleeve may be disrupted, which negatively affects the quality of data transmission. Therefore, there is a need to protect this section of the tract from tearing during stretching and the occurrence of macrobends during flexion.

To solve these problems, according to the utility model, it is proposed to increase the clamping length to values of at least 6 mm and to increase the number of teeth on each side of the clamp to 5 or more.

Studies were conducted to prove the effectiveness of the proposed solution. A typical prototype connector with a clamping length of 3.753 mm and 4 teeth and a connector made according to a utility model with a clamping length of 6.753 mm and 5 teeth were compared. The following test bench was prepared for the study:

MS12001 Cable Assembly Testing System,

universal electromechanical testing machine LabTest 6.10.1.20,

optical measuring cord 0.3 dB,

Optical connector Type 1 with 3.753 mm pressure pad,

optical connector Type 2 with 6.753 mm pressure pad.

The movable clamp of the LabTest machine houses an SC / UPC optical adapter, which serves as a platform for holding the sample with the possibility of recording optical indicators during testing. On the one hand, the generator of the measuring set MS12001 is connected to the adapter using a master cord, on the other is a sample connector (Type 1 / Type 2) to which a fiber-optic cable is already connected. The cable is wrapped around the LabTest's static cable mating mount and connected to the receiver of the MS12001 measurement set.

After the installation of the stand, the universal testing machine is activated in the configuration of a tensile speed of 100 mm / min and a dynamic force increase.

The real-time test detects changes in the IL (intrinsic attenuation) of the connector under test. The test is terminated when the attenuation increases by 50 percent of the static attenuation and the result is recorded as a tensile diagram.

For clarity of the experiment, the tests were carried out on samples without fixing Kevlar threads, fixing the fiber-optic cable was carried out by holding the PVC jacket of the product and the optical fiber in the V-shaped clamp of the connector.

The test results are presented in the diagrams (Fig. 3, 4). The increase in attenuation during the test is caused by the removal of the OF from the V-shaped clamp of the connector. In the tension diagram, this event has the shape of a parabola, where the vertex is the moment of exiting the V-shaped attachment.

A number of tests have determined that the proposed 6.753 mm pressure pad connector can withstand a significantly higher tensile load, up to a critical increase in attenuation, than a typical optical connector. Increasing the length of the pressure pad to 6.753 mm increases the actual maximum tensile force by 37.5%, which improves the performance of the product, which is actively used in the construction of passive optical networks.

Studies have also been carried out on the mechanical properties during bending of the standard and proposed connectors. It has previously been proven that the effect of macrobending of an optical fiber is different for each wavelength. The most susceptible to macrobending are wavelengths from 1310nm to 1625nm.

In the installed connector for the Type 1 pressure pad and Type 2 pressure pad, the diameter of the macrobend of the optical waveguide will start at 4.7594 mm + (1.5x2) mm compensation of the shell and buffer of a typical FOC, total: 7.7594 mm, which falls within the diameter range a macrobend that maximizes transmission performance.

Such a macrobend diameter is possible only under the condition of the maximum pressure of the holding pad on the bend-deformed fiber-optic cable. To calculate the pressure of the pressure pad on the fiber-optic cable, the weight of the calculation of the force in 1000 g was taken.

The calculation was made according to the formula

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...

Average surface pressure is the ratio of force to surface area

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In the case of the same configuration Type 1 and Type 2, the force imposed on the pressure pad is constant, and the area of the pressure pad determines the pressure on the fiber optic cable

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The calculation results are presented in the table:

Sample Clamp surface area of the sample, mm ² Mass for calculating the effort, g Clamping pressure on the sample WOC (Pa) Pressure difference
Type 2 / Type 1 (%) Type 1 16.5132 1000 593.8673304 44.42% Type 2 29.7132 1000 330.0435497

Regardless of the nature of the pressure and its magnitude, under the same conditions, the pressure exerted on the fiber-optic cable by the Type 2 pressure pad is 44.42% less than the pressure exerted by the Type 1 pressure pad. This means that the likelihood of macrobending with a radius less than 10 mm in the proposed connector with a pressure pad length of 6.753 mm is less likely.

Also, it should be noted that thanks to the solutions proposed in the utility model, not only the results described above were achieved, but also an important goal of ensuring the adaptation of the length of the optical fiber inserted into the connector for a typical cleaver. Most field fiber connectors on the market, due to the small length of the shank (shorter than 33 mm), require up to 30 mm of cleaned optical fiber for termination, which, when using a standard cleaver such as Fujicura CT50, requires a special extension cable or process manual chipping without using a magnetic clamp, since the clamp cover of a typical cleaver is at least 33 mm from the blade. The proposed connector, due to the increased length of the shank, is relieved of the problems of chipping with a typical tool, since 35 mm of stripped optical fiber is required to work with the proposed connector.

Thus, the solutions used in the utility model contribute to the achievement of the technical result.

Claims (1)

Fiber optic connector, consisting of a body with a sleeve and a receiving part, a cap, a bracket, a movable nozzle and a protective cap of a ferrule, while the receiving part contains a tapered hole, a bar and a shank in the form of a clamp with teeth, characterized in that the clamp has a length not less than 6 mm, and the number of teeth on each side of the clamp is greater than or equal to 5.

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