CN117347009A - Optical fiber microbending tool, microbending test system and method - Google Patents

Abstract

The invention provides an optical fiber microbending tool, a microbending testing system and a microbending testing method, comprising a barrel body, an adhesive layer and a bottom optical fiber, wherein the adhesive layer is arranged on the outer surface of the barrel body, the bottom optical fiber is adhered to the adhesive layer, the bottom optical fiber comprises a plurality of optical fibers with different outer diameters, each optical fiber with different outer diameters is wound on the outer side of the barrel body at a certain winding angle and winding interval, and the plurality of optical fibers with different outer diameters are adhered to the surface of the barrel body at certain width to form different microbending areas. The invention not only can improve the accuracy of the test result of the microbend of the optical fiber, but also can effectively avoid the conditions of repeated test and time and labor consumption when the condition of multiple microbend sizes of the optical fiber needs to be evaluated, and can also improve the condition of inaccurate test result caused by larger error due to test repeatability.

Description

Optical fiber microbending tool, microbending test system and method

Technical Field

The invention relates to the technical field of optical fiber communication, in particular to an optical fiber microbending tool, a microbending test system and a microbending test method.

Background

Optical fibers are short for optical fibers, and can be used as light conduction tools, the transmission principle is total reflection of light, the optical fibers are soft and bendable, and if the bending radius is too small, the propagation path of the light is changed, so that the light penetrates from the fiber core to the cladding, and even possibly leaks out through the cladding.

Microbending theory shows that the microbending size has a great influence on the optical fiber loss, and optical fibers with different types or refractive index profiles are sensitive to different microbending sizes; in the related art, the microbending test method of the optical fiber is to place the optical fiber on a certain microbending tool (for example, sand paper or metal mesh) so as to generate microbending with a specific size.

The above related art has the following drawbacks: (1) The specific microbend size is difficult to characterize, and the measurement and characterization are difficult mainly because the mesh numbers of the sand paper and the metal mesh are distributed in a relatively wide way and the shape of the sand paper is irregular; (2) Microbends of a single size cannot be evaluated simultaneously for different sizes. If multiple microbend sizes of the optical fiber are to be evaluated, tools with different sizes are required to be prepared for multiple tests, so that time and labor are wasted, errors caused by test repeatability are large, and test results are affected.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the optical fiber microbending tool and the continuous microbending test method with different sizes, which not only can improve the accuracy of the optical fiber microbending test result, but also can effectively avoid the conditions of repeated test and time and labor consumption when the condition of evaluating the multiple microbending sizes of the optical fiber is required, and can also improve the condition of inaccurate test result caused by larger error due to test repeatability.

The specific technical scheme is as follows:

the utility model provides an optic fibre microbending frock, includes staving, adhesion coating and bottom optic fibre, the adhesion coating sets up the surface of staving, the bottom optic fibre is pasted on the adhesion coating, the bottom optic fibre includes multiple different external diameter optic fibre, just every different external diameter optic fibre is certain wire winding angle and wire winding interval winding and is in the staving outside, and multiple different external diameter optic fibre is certain width and pastes the staving surface forms different microbending region.

Optionally, the winding angle range of each optical fiber with different outer diameters is as follows: 1.5-35 deg.

Optionally, the winding interval of each optical fiber with different outer diameters is 0.5 mm-5.0 mm.

Optionally, the outer diameter range of each of the different outer diameter optical fibers is: 40 μm to 500 μm.

Optionally, the winding width of each optical fiber with different outer diameters ranges from 50mm to 400mm.

Optionally, optical fiber fixing parts are arranged at two ends of the barrel body.

The optical fiber microbend testing system comprises the optical fiber microbend tool, an optical time domain reflectometer and an optical fiber to be tested.

A microbending test method for optical fibers with different continuous dimensions comprises the following steps:

s1: connecting one end of the tested optical fiber to an OTDR (optical time domain reflectometer), testing an OTDR attenuation curve of an initial state before microbending, and obtaining initial attenuation data of the tested optical fiber;

s2: winding the tested optical fiber onto the bottom optical fiber on the barrel body with a certain tension force, and fixing two ends of the tested optical fiber;

s3: connecting one end of the tested optical fiber to an optical time domain reflectometer OTDR;

s4: obtaining an optical fiber microbending attenuation curve of the measured optical fiber along the length direction of the barrel body under different microbending sizes through the OTDR, and obtaining an optical fiber microbending additional attenuation OTDR curve through subtracting the initial state attenuation of the measured optical fiber before microbending; and analyzing the microbending additional attenuation curve of the optical fiber to obtain additional attenuation values of the optical fiber under different microbending sizes and the microbending size of the optical fiber which is most sensitive.

Optionally, the measured optical fiber winding interval is 0.2 mm-2.0 mm. .

Optionally, the winding length of the measured optical fiber in each microbend size area is 100 m-1000 m.

Compared with the prior art, the invention has the beneficial effects that:

1. the size and arrangement mode of the bottom optical fibers wound on the barrel body can be set independently, and the measurement result is more accurate;

2. according to the invention, the optical fibers with different outer diameters are wound on the same barrel body to obtain different microbend areas, so that the attenuation curves with different microbend sizes can be obtained through one-time test, the speed and the efficiency are high, and the situation that the test result is inaccurate due to larger errors caused by the test repeatability can be improved.

Drawings

FIG. 1 is a schematic diagram of a front view of an optical fiber microbend fixture in an embodiment of the present invention;

FIG. 2 is a schematic side view of an optical fiber microbend fixture according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an optical fiber microbend fixture in an operating state according to an embodiment of the present invention;

FIG. 4 is an additional attenuation curve for microbending of an optical fiber in an embodiment of the present invention.

In the accompanying drawings: 1. a tub body; 2. an adhesive layer; 3. a bottom optical fiber; 31. a first optical fiber; 32. a second optical fiber; 33. a third optical fiber; 34. a fourth optical fiber; 4. the optical fiber to be tested.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.

The invention relates to an optical fiber microbending tool, which comprises a barrel body 1, an adhesive layer 2 and a bottom optical fiber 3; referring to fig. 1 and 2, the outer diameter of the barrel body 1 is set to be more than 110mm, the material is glass or other, the adhesive layer 2 is arranged on the outer surface of the barrel body 1, the adhesive layer 2 can be double faced adhesive tape or other adhesive materials, in this embodiment, the outer surface of the barrel body 1 is covered with a layer of double faced adhesive tape, then the bottom optical fiber 3 is adhered to the double faced adhesive tape, and the bottom optical fiber 3 is wound on the outer side of the barrel body 1 at a certain winding angle and winding interval, so that a specific microbending effect is generated on the measured optical fiber 4.

In addition, the bottom optical fiber 3 includes a plurality of different outer diameter optical fibers having an outer diameter ranging from 40 μm to 500 μm, as shown in fig. 3, including a first optical fiber 31, a second optical fiber 32, a third optical fiber 33, and a fourth optical fiber 34, and several common outer diameter optical fibers may be used, such as: 100 mu m,135 mu m,165 mu m,180 mu m,245 mu m and the like, and the optical fibers with different outer diameters are stuck on the surface of the barrel body 1 in a certain width, each optical fiber is wound on one layer, no cross exists, and different microbending areas are formed, so that the working barrel with different microbending sizes is obtained, the accuracy of the optical fiber microbending test results can be improved, the conditions of repeated testing and time and labor consuming can be effectively avoided when the conditions of the optical fibers with different microbending sizes are required to be evaluated, and meanwhile, the condition that the test results are inaccurate due to larger errors caused by the test repeatability can be improved.

Meanwhile, the winding intervals of the optical fibers with different outer diameters are set to be 0.5-5 mm, and the inclination angles of two adjacent parallel optical fibers on the barrel body 1 can be kept consistent through the specific winding intervals. The bottom optical fiber can be wound on the barrel body in the same winding angle in a direct oblique winding mode, the included angle (acute angle) between the optical fiber and the central axis of the barrel body ranges from 1.5 degrees to 35 degrees, and the winding angle can be adjusted to further improve the accuracy of the optical fiber microbend test result.

The winding width of each optical fiber with different outer diameters ranges from 0.5mm to 5.0mm, so that the measured data sample is enough, and the obtained microbend size is accurate.

In addition, the two ends of the barrel body are provided with optical fiber fixing parts for fixing the optical fibers so as to keep smooth winding of the optical fibers and further reduce error influence.

The invention provides an optical fiber microbending test system which comprises the optical fiber microbending tool, an optical time domain reflectometer and an optical fiber to be tested.

The method for testing the microbending of the optical fibers with different continuous sizes comprises the following steps:

s1: connecting one end of the tested optical fiber to an OTDR (optical time domain reflectometer), testing an OTDR attenuation curve of an initial state before microbending, and obtaining initial attenuation data of the tested optical fiber;

s2: winding the measured optical fiber 4 onto the bottom optical fiber 3 of the barrel body 1 with a certain tension (0.1N-3N) (the winding interval of the measured optical fiber 4 is 0.2 mm-2.0 mm (the minimum winding interval depends on the outer diameter of the measured optical fiber, for example, the minimum winding interval of the optical fiber with 165 μm outer diameter is 0.2mm, the minimum winding interval of the optical fiber with 245 μm outer diameter is 0.3 mm), ensuring the winding length of the measured optical fiber 4 in each microbending size area to be 100-1000 m), and fixing the two ends of the measured optical fiber 4;

s3: referring to fig. 3, one end of the measured optical fiber 4 is connected to an optical time domain reflectometer OTDR;

s4: the OTDR attenuation curve of the measured optical fiber 4 in the optical fiber microbending state obtained under different microbending sizes along the length direction of the barrel body 1 can be obtained through the optical time domain reflectometer OTDR, referring to fig. 4, the initial state attenuation of the optical fiber before microbending is subtracted, and the additional OTDR attenuation curve of the optical fiber microbending is obtained. The additional attenuation values of the optical fibers under different microbending sizes and the most sensitive microbending sizes of the optical fibers can be obtained by analyzing the additional attenuation curves of the optical fibers, further, different microbending areas can be obtained by winding the optical fibers with different outer diameters on the same barrel body, the attenuation curves with different microbending sizes can be obtained through one-time test, the speed and the efficiency are high, and the situation that the test result is inaccurate due to the fact that errors caused by the test repeatability are large can be improved.

The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a fiber microbending frock, its characterized in that, includes staving, adhesion coating and bottom optic fibre, the adhesion coating sets up the surface of staving, the bottom optic fibre is pasted on the adhesion coating, the bottom optic fibre includes multiple different external diameter optic fibre, just every different external diameter optic fibre is certain wire winding angle and wire winding interval winding in the staving outside, and multiple different external diameter optic fibre is certain width all paste the staving surface forms different microbending region.

2. The optical fiber microbend fixture according to claim 1, wherein the winding angle range of each of the optical fibers of different outer diameters is: 1.5-35 deg.

3. The optical fiber microbend fixture according to claim 1, wherein the winding interval of each optical fiber with different outer diameters is 0.5 mm-5.0 mm.

4. The optical fiber microbend fixture of claim 1 wherein the outer diameter range of each of said different outer diameter optical fibers is: 40 μm to 500 μm.

5. The optical fiber microbend fixture according to claim 1, wherein the winding width of each of the optical fibers with different outer diameters ranges from 50mm to 400mm.

6. The optical fiber microbend fixture according to claim 1, wherein optical fiber fixing components are arranged at two ends of the barrel body.

7. An optical fiber microbend testing system comprising the optical fiber microbend fixture, an optical time domain reflectometer and an optical fiber to be tested according to any one of claims 1-6.

8. A method for testing microbending of an optical fiber, which is realized based on the testing system of claim 7, comprising the following steps:

s1: connecting one end of the tested optical fiber to an OTDR (optical time domain reflectometer), testing an OTDR attenuation curve of an initial state before microbending, and obtaining initial attenuation data of the tested optical fiber;

s2: winding the tested optical fiber onto the bottom optical fiber on the barrel body with a certain tension, and fixing the two ends of the tested optical fiber;

s3: connecting one end of the tested optical fiber to an optical time domain reflectometer OTDR;

s4: obtaining an optical fiber microbending attenuation curve of the measured optical fiber along the length direction of the barrel body under different microbending sizes through the OTDR, and obtaining an optical fiber microbending additional attenuation OTDR curve through subtracting the initial state attenuation of the measured optical fiber before microbending; and analyzing the microbending additional attenuation curve of the optical fiber to obtain additional attenuation values of the optical fiber under different microbending sizes and the microbending size of the optical fiber which is most sensitive.

9. The method of claim 8, wherein the measured optical fiber windings are spaced apart by 0.2mm to 2.0mm.

10. The method according to claim 8, wherein the winding length of the measured optical fiber in each microbend size region is 100 m-1000 m.