CN111338023A - Panda-type polarization-maintaining fiber array with small core pitch and preparation method thereof - Google Patents

Abstract

The invention discloses a panda type polarization maintaining optical fiber array with small fiber core distance and a preparation method thereof, wherein the preparation method comprises the following steps: the polarization maintaining optical fiber assembling fixture comprises a first positioning substrate, a second positioning substrate and a third positioning substrate, wherein the first positioning substrate, the second positioning substrate and the third positioning substrate are sequentially placed on the assembling fixture at intervals, bare fiber sections of a first optical fiber group are sequentially placed in odd-numbered V-shaped grooves of the first positioning substrate, the second positioning substrate and the third positioning substrate, bare fiber sections of a second optical fiber group are sequentially placed in even-numbered V-shaped grooves of the first positioning substrate and the second positioning substrate, a cover plate is mounted above the first positioning substrate in a bonding mode, and the bare fiber sections of polarization maintaining optical fibers are cut off at the end portion, close to the second positioning substrate, of the first positioning substrate. The manufacturing method is simple to operate, can safely and efficiently manufacture the small-fiber-core-pitch panda-type polarization-maintaining fiber array, and provides the small-fiber-core-pitch panda-type polarization-maintaining fiber array produced by the manufacturing method.

Description

Panda-type polarization-maintaining fiber array with small core pitch and preparation method thereof

technical field

The invention belongs to the technical field of optical fiber communication, and in particular relates to a panda-type polarization-maintaining optical fiber array with a small core distance and a preparation method thereof.

Background technique

Panda-type polarization-maintaining fiber is a double-ultraviolet coating structure, which has the characteristics of high birefringence effect, good polarization-maintaining performance, low attenuation, good bending stability, high stability and reliability, and can be widely used in aerospace, aviation, Various fields of the national economy such as navigation, industrial manufacturing and communications. At present, the production of panda-type polarization-maintaining fiber is to first preset a number of V-shaped grooves on the glass substrate, then place the bare fiber end of the polarization-maintaining fiber in each V-shaped groove, and finally fix the glass cover with UV curing glue On glass substrates, this fabrication method is not suitable for all types of panda-type PM fibers. Most panda-type polarization-maintaining fibers need to be used in data centers, so the overall size and core distance of panda-type polarization-maintaining fibers are required to become smaller and smaller. For example, when preparing panda-type polarization-maintaining fibers with a core distance of 127um , since the outer diameter of the polarization-maintaining fiber is 250um and the diameter of the bare fiber is 125um, the outer diameter of the polarization-maintaining fiber is much larger than the core distance. interference, it cannot be guaranteed that the plane error of the polarization-maintaining fiber cores of all channels is within 3°. Therefore, both the panda-type polarization-maintaining optical fiber and the preparation method thereof in the prior art need to be further improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a preparation method that is simple to operate and can produce a panda-type polarization-maintaining optical fiber array with a small core distance safely and efficiently, and provides a small-core-pitch panda-type polarization-maintaining optical fiber array produced by the preparation method. , The polarization-maintaining fiber array has novel structure and strong practicability.

Based on the above object, the present invention adopts the following technical solutions:

A preparation method of a panda-type polarization-maintaining fiber array with a small core pitch, comprising the following steps:

(1) The first positioning substrate, the second positioning substrate, and the third positioning substrate are placed on the assembly jig at intervals in sequence, and the upper surfaces of the first positioning substrate, the second positioning substrate, and the third positioning substrate are respectively provided with corresponding and the same number. The number of V-grooves and polarization-maintaining fibers is ≥4 and an even number;

(2) The polarization-maintaining fiber is divided into a first fiber group and a second fiber group. The polarization-maintaining fiber includes a coated segment, a bare fiber segment and a stress region. The coated segment of the first fiber group is placed on the assembly fixture, and the first fiber The bare fiber segments of the group are placed in the odd-numbered V-grooves of the first positioning substrate, the second positioning substrate, and the third positioning substrate in turn, the stress zone of the first fiber group is rotated to a predetermined direction, and then the bare fibers of the first fiber group are The segment is positioned in the odd-numbered V-shaped grooves of the third positioning substrate by bonding;

(3) The coated section of the second optical fiber group is placed above the coated section of the first optical fiber group, and the bare fiber section of the second optical fiber group is placed in the even-numbered V-shaped grooves of the first positioning substrate and the second positioning substrate in turn. , the stress zone of the second optical fiber group is rotated to a predetermined direction, and then the bare fiber segments of the second optical fiber group are positioned in the even-numbered V-shaped grooves of the second positioning substrate by bonding;

(4) A cover plate is installed above the first positioning substrate by bonding;

(5) Cut the bare fiber segment of the polarization-maintaining fiber at the end of the first positioning substrate close to the second positioning substrate, and remove the second positioning substrate and the third positioning substrate to obtain a panda-type polarization-maintaining fiber array with a small core distance .

Further, the first positioning substrate is stepped, and the first positioning substrate includes a high-step substrate and a low-step substrate. The high-step substrate is provided with a V-shaped groove, and the bare fiber segment of the polarization-maintaining fiber is fixed in the V-shaped groove. The bare fiber segment of the polarization-maintaining fiber and the coated segment of the polarization-maintaining fiber are placed on the low-step substrate.

Further, the bonding is fixed by ultraviolet curing glue.

Further, in the step (5), the core distance of the bare fiber segment of the panda-type polarization-maintaining fiber array with small core distance in the V-shaped groove is 127um.

Further, the diameter of the bare fiber segment of the polarization-maintaining fiber is 125um, and the diameter of the coated segment of the polarization-maintaining fiber is 250um.

A small-core-pitch panda-type polarization-maintaining optical fiber array includes a first positioning substrate and a polarization-maintaining optical fiber, a V-shaped groove is formed on the upper surface of the first positioning substrate, and the number of the V-shaped groove and the polarization-maintaining optical fiber is ≥ 4 and is Even, the polarization-maintaining fiber is divided into a first fiber group and a second fiber group. The polarization-maintaining fiber includes a coated segment, a bare fiber segment, and a stress region. The bare fiber segment of the first fiber group is fixed on the odd-numbered V-shape of the first positioning substrate. In the groove, the stress zone of the first optical fiber group is in a predetermined direction, the bare fiber segments of the second optical fiber group are fixed in the even-numbered V-shaped grooves of the first positioning substrate, the stress zone of the second optical fiber group is in a predetermined direction, and the second optical fiber group is in a predetermined direction. The coating section is located above the coating section of the first optical fiber group, and a cover plate is installed above the first positioning substrate by bonding.

Further, the first positioning substrate is stepped, and the first positioning substrate includes a high-step substrate and a low-step substrate. The high-step substrate is provided with a V-shaped groove, and the bare fiber segment of the polarization-maintaining fiber is fixed in the V-shaped groove. The bare fiber segment of the polarization-maintaining fiber and the coated segment of the polarization-maintaining fiber are placed on the low-step substrate.

Further, the bonding is fixed by ultraviolet curing glue.

Further, the core distance of the bare fiber segment of the polarization-maintaining fiber in the V-groove is 127um.

Further, the diameter of the bare fiber segment of the polarization-maintaining fiber is 125um, and the diameter of the coated segment of the polarization-maintaining fiber is 250um.

Compared with the prior art, the present invention has the following beneficial effects:

In the preparation method of the panda-type polarization-maintaining fiber array with small fiber core distance provided by the present invention, the polarization-maintaining fibers are divided into a first fiber group and a second fiber group, and the bare fibers of the first fiber group are fixed by beating in stages. The segment is fixed on the third positioning substrate, the bare fiber segment of the second optical fiber group is fixed on the second positioning substrate, and the polarization maintaining fibers of odd V-grooves and even V-grooves are separately fixed with UV fixing glue. The core distance (127um) is much smaller than the diameter of the coating section (250um) of the polarization maintaining fiber. The coating section of the second fiber group is placed above the coating section of the first fiber group, which can be compared to the flat lay The polarization-maintaining fiber saves space, keeps the polarization-maintaining fiber straight when fixed, and reduces the bending phenomenon of the polarization-maintaining fiber. When the stress regions of the first fiber group and the second fiber group rotate to a predetermined direction, the adjacent polarization-maintaining fibers will not affect each other, which can effectively ensure that the slow axis of each polarization-maintaining fiber and the fibers of all polarization-maintaining fibers The included angle formed by the plane on which the core is located is less than 3°. The cover plate is covered on the first positioning substrate by UV fixing glue, and finally the bare fiber segment of the polarization-maintaining fiber is cut off, and the second positioning substrate and the third positioning substrate are removed, and the corresponding small-core-pitch panda-type polarization-maintaining fiber array can be obtained. , the preparation method is simple to operate, safe and efficient.

In the small-core-pitch panda-type polarization-maintaining fiber array provided by the present invention, the polarization-maintaining fibers are divided into a first fiber group and a second fiber group, and are fixed in the odd-numbered V-shaped grooves of the first positioning substrate by means of step-by-step beating and fixing. The bare fiber segment of the first fiber group is fixed, and the bare fiber segment of the second fiber group is fixed in the even-numbered V-shaped grooves of the second positioning substrate, and the core distance (127um) is smaller than the outer diameter of the polarization maintaining fiber (250um) In many cases, the coating section of the second optical fiber group is located above the coating section of the first optical fiber group, which can save space compared with the polarization-maintaining fiber arranged flatly, and can keep the polarization-maintaining fiber straight when it is fixed. Reduce polarization-maintaining fiber bending. When the stress regions of the first fiber group and the second fiber group are in a predetermined direction, the adjacent polarization-maintaining fibers will not affect each other, which can effectively ensure that the slow axis of each polarization-maintaining fiber is in contact with the cores of all polarization-maintaining fibers. The included angle formed by the plane at is less than 3°. The polarization-maintaining optical fiber array has novel structure and strong practicability.

Description of drawings

Fig. 1 is the method schematic diagram of embodiment;

Fig. 2 is the enlarged view of A place in Fig. 1;

FIG. 3 is a schematic structural diagram of the polarization-maintaining fiber array;

FIG. 4 is an enlarged view of B in FIG. 3 .

In the figure: 1, the first positioning substrate; 101, the high-step substrate; 102, the low-step substrate; 2, the second positioning substrate; 3, the third positioning substrate; 4, the assembly fixture; 5, the first optical fiber group; 501, Coating section of the first optical fiber group; 502, bare fiber section of the first optical fiber group; 6, second optical fiber group; 601, coating section of the second optical fiber group; 602, bare fiber section of the second optical fiber group; 7. Cover plate.

Detailed ways

The technical solutions of the present invention are further described in detail below with reference to specific embodiments, but the content of the present invention is not limited thereto.

As shown in Figures 1-4, the present invention provides a preparation method of a panda-type polarization-maintaining fiber array with a small core distance, which includes the following steps:

(1) The first positioning substrate 1 , the second positioning substrate 2 , and the third positioning substrate 3 are placed on the assembly fixture 4 at intervals in sequence, and the upper surfaces of the first positioning substrate 1 , the second positioning substrate 2 , and the third positioning substrate 3 are respectively There are V-grooves corresponding to each other and the same number, and the number of V-grooves and polarization-maintaining fibers is ≥4 and an even number;

(2) The polarization-maintaining fiber is divided into a first fiber group 5 and a second fiber group 6. The polarization-maintaining fiber includes a coated section, a bare fiber section, and a stress region. The diameter of the bare fiber section of the polarization-maintaining fiber is 125um. The diameter of the coating section is 250um, the coating section 501 of the first optical fiber group is placed on the assembly fixture 4, and the bare fiber section 502 of the first optical fiber group is placed on the first positioning substrate 1, the second positioning substrate 2, and the third positioning substrate in turn. In the odd-numbered V-shaped grooves of the substrate 3, the stress zone of the first optical fiber group 5 is rotated to a predetermined direction, and then the bare fiber segments 502 of the first optical fiber group are positioned in the odd-numbered V-shaped grooves of the third positioning substrate 3 by ultraviolet curing glue;

The first positioning substrate 1 is in a stepped shape. The first positioning substrate 1 includes a high-step substrate 101 and a low-step substrate 102. The high-step substrate 101 is provided with a V-shaped groove, and the bare fiber segment of the polarization-maintaining fiber is fixed in the V-shaped groove. The bare fiber segment of the polarization-maintaining fiber and the coated segment of the polarization-maintaining fiber are placed on the low-step substrate 102;

(3) The coating section 601 of the second optical fiber group is placed above the coating section 501 of the first optical fiber group, and the bare fiber section 602 of the second optical fiber group is placed on the even-numbered V shape of the first positioning substrate 1 and the second positioning substrate 2 in turn. In the groove, the stress zone of the second optical fiber group 6 is rotated to a predetermined direction, and then the bare fiber segment 602 of the second optical fiber group is positioned in the even-numbered V-shaped groove of the second positioning substrate 2 by ultraviolet curing glue;

(4) The cover plate 7 is installed on the top of the first positioning substrate 1 by ultraviolet curing glue;

(5) Cut the bare fiber segment of the polarization-maintaining fiber at the end of the first positioning substrate 1 close to the second positioning substrate 2, and remove the second positioning substrate 2 and the third positioning substrate 3, that is, a panda type with a small core pitch is obtained. Polarization maintaining fiber array, the core distance of the bare fiber segment in the V-groove of the panda-type polarization maintaining fiber array with small core distance is 127um.

The present invention also provides a small core-pitch panda-type polarization-maintaining fiber array, which includes a first positioning substrate 1 and a polarization-maintaining fiber. The first positioning substrate 1 is stepped, and the first positioning substrate 1 includes a high-step substrate 101 and a low-level substrate 101. The stepped substrate 102, the high-step substrate 101 is provided with a V-shaped groove, and the bare fiber segment of the polarization-maintaining fiber is fixed in the V-shaped groove, and the bare fiber segment of the polarization-maintaining fiber and the coating of the polarization-maintaining fiber are placed on the low-step substrate 102 part. The number of V-grooves and polarization-maintaining fibers of the first positioning substrate 1 are both ≥4 and an even number. The polarization-maintaining fibers are divided into a first fiber group 5 and a second fiber group 6. The polarization-maintaining fibers include coated sections and bare fibers. The diameter of the bare fiber segment of the polarization-maintaining fiber is 125um, and the diameter of the coated segment of the polarization-maintaining fiber is 250um. The bare fiber segments 502 of the first optical fiber group are fixed in the odd-numbered V-shaped grooves of the first positioning substrate 1 , the stress area of the first optical fiber group 5 is in a predetermined direction, and the bare fiber segments 602 of the second optical fiber group are fixed in the first positioning substrate 1 . In the even-numbered V-grooves, the stress zone of the second fiber group 6 is in a predetermined direction, the coating section 601 of the second fiber group is located above the coating section 501 of the first fiber group, and the bare fiber section of the polarization-maintaining fiber in the V-groove The core distance is 127um, and a cover plate 7 is installed on the top of the first positioning substrate 1 through ultraviolet curing glue.

Claims (10)

1. A preparation method of a panda type polarization maintaining optical fiber array with small fiber core distance is characterized by comprising the following steps:

(1) the first positioning substrate, the second positioning substrate and the third positioning substrate are sequentially placed on the assembling fixture at intervals, V-shaped grooves which correspond to one another and are the same in number are respectively formed in the upper surfaces of the first positioning substrate, the second positioning substrate and the third positioning substrate, and the number of the V-shaped grooves and the number of the polarization maintaining optical fibers are both more than or equal to 4 and are even numbers;

(2) the polarization maintaining optical fiber is divided into a first optical fiber group and a second optical fiber group, the polarization maintaining optical fiber comprises a coating section, a bare fiber section and a stress area, the coating section of the first optical fiber group is placed on the assembling clamp, the bare fiber section of the first optical fiber group is sequentially placed in odd-numbered V-shaped grooves of the first positioning substrate, the second positioning substrate and the third positioning substrate, the stress area of the first optical fiber group rotates to a preset direction, and then the bare fiber section of the first optical fiber group is positioned in the odd-numbered V-shaped groove of the third positioning substrate through bonding;

(3) the coating section of the second optical fiber group is placed above the coating section of the first optical fiber group, the bare fiber section of the second optical fiber group is sequentially placed in even number V-shaped grooves of the first positioning substrate and the second positioning substrate, the stress area of the second optical fiber group rotates to a preset direction, and then the bare fiber section of the second optical fiber group is positioned in the even number V-shaped groove of the second positioning substrate through bonding;

(4) a cover plate is arranged above the first positioning substrate through bonding;

(5) and cutting the bare fiber section of the polarization maintaining fiber at the end part of the first positioning substrate close to the second positioning substrate, and removing the second positioning substrate and the third positioning substrate to obtain the panda-type polarization maintaining fiber array with small fiber core distance.

2. The method for preparing the panda-type polarization maintaining fiber array with small fiber core spacing according to claim 1, wherein the first positioning substrate is in a step shape, the first positioning substrate comprises a high-step substrate and a low-step substrate, a V-shaped groove is formed in the high-step substrate, a bare fiber section of the polarization maintaining fiber is fixed in the V-shaped groove, and a bare fiber section of the polarization maintaining fiber and a coating section of the polarization maintaining fiber are placed on the low-step substrate.

3. The method for preparing the panda-type polarization maintaining fiber array with small fiber core spacing according to claim 1, wherein the bonding is ultraviolet curing glue fixation.

4. The method for preparing the panda-type small core distance polarization maintaining fiber array according to claim 1, wherein the core distance of the bare fiber section of the panda-type small core distance polarization maintaining fiber array in the V-groove in the step (5) is 127 um.

5. The method for preparing a panda-type polarization maintaining fiber array with small fiber core distance according to claim 1, wherein the diameter of the bare fiber section of the polarization maintaining fiber is 125um, and the diameter of the coated section of the polarization maintaining fiber is 250 um.

6. The small-fiber-core-distance panda-type polarization maintaining optical fiber array is characterized by comprising a first positioning substrate and polarization maintaining optical fibers, wherein V-shaped grooves are formed in the upper surface of the first positioning substrate, the number of the V-shaped grooves and the number of the polarization maintaining optical fibers are both more than or equal to 4 and are even numbers, the polarization maintaining optical fibers are divided into a first optical fiber group and a second optical fiber group, each polarization maintaining optical fiber comprises a coating section, a bare fiber section and a stress area, the bare fiber section of the first optical fiber group is fixed in an odd-number V-shaped groove of the first positioning substrate, the stress area of the first optical fiber group is in a preset direction, the bare fiber section of the second optical fiber group is fixed in an even-number V-shaped groove of the first positioning substrate, the stress area of the second optical fiber group is in the preset direction, the coating section of the second optical fiber group is located above the coating section of the first optical fiber group, and.

7. The array of panda-type polarization maintaining optical fibers with small fiber core spacing according to claim 6, wherein the first positioning substrate is in a step shape and comprises a high step substrate and a low step substrate, the high step substrate is provided with a V-shaped groove, a bare fiber section of the polarization maintaining optical fiber is fixed in the V-shaped groove, and a bare fiber section of the polarization maintaining optical fiber and a coating section of the polarization maintaining optical fiber are placed on the low step substrate.

8. The small core pitch panda-type polarization maintaining fiber array according to claim 6, wherein the bonding is ultraviolet curing glue fixation.

9. The array of small-core-pitch panda-type polarization maintaining fibers according to claim 6, wherein the core pitch of the bare fiber section of the polarization maintaining fiber in the V-shaped groove is 127 um.

10. The small core pitch panda-type polarization maintaining fiber array of claim 6, wherein the diameter of the bare fiber section of the polarization maintaining fiber is 125um, and the diameter of the coated section of the polarization maintaining fiber is 250 um.

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