Flexible optical fiber ribbon and cable

Abstract

The application discloses a kind of flexible optical fiber ribbon and cable, belong to cable technical field, including the bonding of multiple optical fibers by axially discontinuous adhesive strip;With the plane where the axis of multiple optical fibers is located as reference surface, one side half profile curve of the profile contour of adhesive strip meets the following conditions: The application is with the ratio of the area enclosed by profile half profile curve and reference surface and the length of adhesive strip as demarcation, the part of half profile curve and reference surface distance greater than H is set as reinforcing portion, by limiting the ratio of the total length of reinforcing portion in single adhesive strip along axial direction and the axial length of adhesive strip within 0.1~0.5, the bonding force and curing stress of adhesive strip are comprehensively adjusted, to obtain flexible optical fiber ribbon which is not easy to scatter and has small additional attenuation.

Description

Technical Field

[0001] This invention belongs to the field of optical cable technology, specifically relating to a flexible optical fiber ribbon and optical cable. Background Technology

[0002] Flexible fiber ribbon is a fiber optic assembly structure that uses an axially discontinuous adhesive bonding structure. The discontinuity of the adhesive bonding structure gives the flexible fiber ribbon good flexibility, and the bonding of multiple fibers can increase the fiber density. Then, by curling and encapsulating the flexible fiber ribbon in the optical cable sheath, the fiber core density in the optical cable can be greatly increased.

[0003] Flexible fiber ribbons achieve both flexibility and good constraint through discontinuous bonding structures. However, when the bonding area of ​​the discontinuous bonding structure is too small, the constraint on the flexible fiber ribbon is weak, making it prone to unraveling during subsequent cabling and use, which is detrimental to the splicing of the entire flexible fiber ribbon. When the bonding area of ​​the discontinuous bonding structure is too large, the discontinuous bonding structure will shrink during curing, and the curing stress will lead to an increase in additional fiber attenuation. On the other hand, an excessively large bonding area will also affect the bending performance of the flexible fiber ribbon, which can easily cause greater additional attenuation during subsequent cabling. Summary of the Invention

[0004] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a flexible optical fiber ribbon, which solves the contradiction between structural stability and additional attenuation of optical fiber by designing the adhesive strip structure.

[0005] To achieve the above objectives, the present invention provides a flexible optical fiber ribbon, comprising: Multiple optical fibers bonded by axially discontinuous adhesive strips; The plane containing the central axis of the multiple optical fibers is used as the reference plane; The profile of the adhesive strip, on one half of its cross-sectional contour curve, satisfies the following condition:

[0006] in, The distance from the reference plane is greater than The continuous section is the reinforcement section. To strengthen the department The number, , To strengthen the department axial length, This is the area enclosed by the semi-profile curve of the cross section and the reference plane; The axial length of the adhesive strip; The axial poles of the adhesive strip are used as the dividing lines, and the curve of the cross-sectional profile of the adhesive strip between the two poles is called the semi-profile curve.

[0007] As a preferred embodiment of the present invention, any of the reinforcing portions in the adhesive strip axial length It is 0.5~5mm.

[0008] In a preferred embodiment of the present invention, the adhesive strip has 4 to 10 reinforcing parts.

[0009] As a preferred embodiment of the present invention, the average distance from the half-profile curve of the cross-section of any of the reinforcing parts to the reference plane is... It is 0.1~0.2mm.

[0010] In a preferred embodiment of the present invention, the adhesive strip has the reinforcing portion and the connecting portion arranged alternately along the axial direction; in, The distance to the reference plane is less than or equal to The continuous section is the connecting part. Number the connecting parts. ; Any of the connecting parts in the adhesive strip axial length The diameter is 15~60mm.

[0011] In a preferred embodiment of the present invention, the reinforcing portion has gaps between its two sides facing the adjacent optical fibers and the optical fibers.

[0012] In a preferred embodiment of the present invention, the breaking force of the two adjacent optical fibers at the adhesive strip is 0.05~0.5N.

[0013] In a preferred embodiment of the present invention, the adhesive strip is formed by two-stage dispensing, and at least a portion of the reinforcing part is formed by a second dispensing.

[0014] In a preferred embodiment of the present invention, the maximum distance from the half-profile of the reinforcing section to the baseline is not greater than the radius of the optical fiber.

[0015] The present invention also includes an optical cable comprising the flexible optical fiber ribbon.

[0016] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0017] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The flexible optical fiber ribbon of the present invention, through the structural design of the adhesive strip, sets a reinforcing part along the optical fiber axis of the adhesive strip, so that the adhesive strip forms a discontinuous reinforcing structure. Without increasing the bonding length between optical fibers or increasing the additional attenuation of the optical fibers, the structural stability of the flexible optical fiber ribbon is improved, and the additional attenuation of the optical fibers is decoupled from the structural stability of the flexible optical fiber ribbon. The present invention uses the ratio of the area enclosed by the half-profile curve of the cross section and the reference plane to the length of the adhesive strip as the boundary, and sets the part of the half-profile curve with a distance greater than H from the reference plane as the reinforcing part. By limiting the ratio of the total length of the reinforcing part along the axial direction in a single adhesive strip to the axial length of the adhesive strip within 0.1~0.5, the bonding force and curing stress of the adhesive strip are comprehensively adjusted to obtain a flexible optical fiber ribbon that is not easy to delaminate and has low additional attenuation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the flexible optical fiber ribbon in an embodiment of the present invention; Figure 2 This is a schematic diagram of the side structure of the flexible optical fiber strip in an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of a flexible optical fiber strip in an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the second type of flexible optical fiber strip in an embodiment of the present invention; Figure 5 This is a schematic cross-sectional view of the third type of flexible optical fiber strip in an embodiment of the present invention; Figure 6 This is a schematic cross-sectional view of the fourth type of flexible optical fiber strip in this embodiment of the invention; Figure 7 This is a schematic cross-sectional view of the fifth type of flexible optical fiber strip in this embodiment of the invention; Figure 8 This is a schematic cross-sectional view of the half-contour of the adhesive strip in an embodiment of the present invention; Figure 9 These are electron microscope images of the flexible optical fiber ribbon in an embodiment of the present invention; Figure 10 This is the profile fitting curve of the adhesive strip obtained by image analysis in this embodiment of the invention.

[0019] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Optical fiber; 2. Adhesive strip; 201. Reinforcing part; 202. Connecting part. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0021] In the description of this invention, it should be understood that, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] Furthermore, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Please see Figure 1 , Figure 2 As shown, in a preferred embodiment of the present invention, the flexible optical fiber strip includes multiple optical fibers 1 bonded together by an axially discontinuous adhesive strip 2; wherein, taking the plane containing the central axis of the multiple optical fibers 1 as a reference plane, one half-profile curve of the cross-sectional profile of the adhesive strip 2 satisfies the following condition:

[0026] in, The distance from the reference plane is greater than The continuous section, namely the reinforced section 201, To strengthen the Ministry of 201 The number, , To strengthen the Ministry of 201 axial length, This is the area enclosed by the semi-profile curve of the cross section and the reference plane; Let be the axial length of the adhesive strip 2; taking the two axial poles of the adhesive strip 2 as boundaries, the curve of the cross-sectional profile of the adhesive strip 2 between the two poles is called the semi-profile curve, such as... Figure 8 As shown.

[0027] In the conventional design of flexible optical fiber ribbon structures, the main focus is on the inherent characteristics of optical fiber 1, the adhesive bonding characteristics, and the shape characteristics of the bond between optical fiber 1 and the adhesive. This design aims to achieve a balance between the inherent attenuation and bonding performance of the flexible optical fiber ribbon. Specifically, the design considering the shape characteristics of the bond between optical fiber 1 and the adhesive primarily focuses on the shape of the optical fiber 1 and the adhesive in the radial cross-section of the optical fiber. Examples include the adhesive fully covering optical fiber 1, partially covering optical fiber 1, or forming a concave or convex structure between the two optical fibers 1. However, regarding the cross-sectional shape of optical fiber 1 and the adhesive, the amount of adhesive applied is directly proportional to the degree of coverage of optical fiber 1. That is, a larger amount of adhesive results in a larger bonding area between the adhesive and optical fiber 1 (greater additional attenuation of the optical fiber), and better bonding performance between the optical fibers 1. This positive correlation makes it impossible to decouple the additional attenuation of optical fiber 1 from its bonding performance.

[0028] The flexible optical fiber ribbon of this invention, through the structural design of the adhesive strip 2, incorporates a reinforcing portion 201 along the axial direction of the optical fiber 1, creating a discontinuous reinforcing structure. This improves the structural stability of the flexible optical fiber ribbon without increasing the bonding length between the optical fibers 1 or increasing the additional attenuation of the optical fibers, thus decoupling the additional attenuation of the optical fiber from the structural stability of the flexible optical fiber ribbon. Specifically, this invention uses the ratio of the area enclosed by the half-profile curve of the cross-section and the reference plane to the length of the adhesive strip 2 as the boundary, designating the portion of the half-profile curve with a distance greater than H from the reference plane as the reinforcing portion 201. By limiting the ratio of the total axial length of the reinforcing portion 201 in a single adhesive strip 2 to the axial length of the adhesive strip 2 to within 0.1~0.5, the bonding force and curing stress of the adhesive strip 2 are comprehensively adjusted to obtain a flexible optical fiber ribbon that is less prone to unraveling and has low additional attenuation. The value comprehensively reflects the axial structure of the adhesive strip 2. A larger value indicates that the axial structure changes gradually and cannot significantly improve the breaking force and strengthen the stability of the flexible optical fiber ribbon structure. A smaller value indicates that the peak height of the axial strengthening part is obvious and cannot effectively strengthen the bonding effect between optical fibers. It may also make the surface of the optical fiber ribbon rough and aggravate the structural instability.

[0029] Furthermore, as an optional embodiment of the present invention, any reinforcing portion 201 of the adhesive strip 2 in the present invention... axial length It is 0.5~5mm.

[0030] During the molding of the adhesive strip, the shape of the reinforcing part 201 follows a Laplace curve. The greater the axial extension length of a single reinforcing part 201 along the optical fiber 1, the higher the vertical protrusion height of the reinforcing part 201, the more adhesive the adhesive strip 2 extends radially to the surface of the optical fiber 1, and the greater the additional attenuation of the optical fiber 1 caused by the adhesive curing. Simultaneously, when the number of reinforcing parts 201 is excessive, the vertical protrusion height of a single reinforcing part 201 is lower, the area of ​​the reinforcing part 201 on the tear surface is smaller, and the adhesive force provided to the optical fiber 1 is smaller. Therefore, to balance the adhesive force and adhesive area provided by the adhesive strip 2, this invention controls the axial length of a single reinforcing part 201 to 0.5~5mm, so that the reinforcing part 201 provides good adhesive force without significantly increasing the additional attenuation of the optical fiber 1.

[0031] Furthermore, such as Figure 3As shown, in an optional embodiment of the present invention, a single adhesive strip 2 has 4 to 10 reinforcing portions 201. When the axial length of a single adhesive strip 2 is within a set range, the number of reinforcing portions 201 is inversely proportional to the axial length of a single reinforcing portion 201. Too many reinforcing portions 201 will result in a lower protrusion height of the reinforcing portions 201, and the reinforcing portions 201 will contribute less to the bonding force of the optical fiber 1; too few reinforcing portions 201 will result in an excessively high protrusion height of the reinforcing portions 201, and the bonding area between the reinforcing portions 201 and the optical fiber 1 will increase accordingly. The curing shrinkage of the adhesive strip 2 will cause an increase in the additional attenuation of the optical fiber 1. Based on this, the present invention limits the number of reinforcing portions 201 on a single adhesive strip 2 to 4 to 10, so that the reinforcing portions 201 provide good bonding force without significantly increasing the additional attenuation of the optical fiber 1.

[0032] Furthermore, as an optional embodiment of the present invention, the average distance from the half-profile curve of the cross-section of any reinforcing part 201 to the reference plane is... It is 0.1~0.2mm.

[0033] Furthermore, as an optional embodiment of the present invention, the adhesive strip 2 has reinforcing portions 201 and connecting portions 202 alternately arranged along the axial direction; wherein, The distance to the reference plane is less than or equal to The continuous section is the connecting part. Number the connecting parts. Any connecting part 202 of the adhesive strip 2 axial length The diameter is 15~60mm.

[0034] Furthermore, as an optional embodiment of the present invention, the reinforcing portion 201 has gaps between itself and the two adjacent optical fibers 1 on both sides. When the optical fibers 1 separate, the bonding force of the optical fibers 1 is positively correlated with the area of ​​the torn surface; when the adhesive strip 2 causes additional attenuation of the optical fibers 1, the contact area between the adhesive strip 2 and the optical fibers 1 is positively correlated with the additional attenuation of the optical fibers 1. Therefore, as a preferred embodiment of the present invention, the reinforcing portion 201 is not connected to the optical fibers 1, so that it only increases the breaking force of the separation of the two adjacent optical fibers 1 without affecting the additional attenuation of the optical fibers 1.

[0035] Furthermore, as an optional embodiment of the present invention, the breaking force of the separation between two adjacent optical fibers 1 at the adhesive strip 2 is between 0.05 and 0.5 N. When the breaking force of the separation between two adjacent optical fibers 1 at the adhesive strip 2 is between 0.05 and 0.5 N, it means that the adhesive strip 2 basically separates at the maximum cross-section, and the reinforcing portion 201 on the adhesive strip 2 can provide maximum adhesive force support. However, when the breaking force of the separation between two adjacent optical fibers 1 at the adhesive strip 2 is too large, the adhesive strip 2 will tear the surface coating of the optical fiber 1 during separation; when the breaking force is too small, the adhesive strip 2 will break on the side closer to one of the optical fibers 1, resulting in the flexible optical fiber ribbon failing to meet performance standards.

[0036] Furthermore, as an optional embodiment of the present invention, the adhesive strip 2 in the present invention is formed by one-time dispensing. The present invention can form an adhesive strip 2 with reinforcing part 201 by controlling the dispensing process during each forming of the adhesive strip 2, and by controlling the amount of adhesive applied and the application pressure.

[0037] Furthermore, such as Figure 7 As shown, in an optional embodiment of the present invention, the reinforcing part 201 is formed by secondary dispensing, and at least a portion of the reinforcing part 201 is formed by the second dispensing. Besides primary dispensing, the present invention can also pre-dispense adhesive between the optical fibers 1, and then perform secondary dispensing to form an adhesive strip 2 with the reinforcing part 201. By forming the reinforcing part 201 through secondary dispensing, the reinforcing part 201 can be formed on the surface of the adhesive structure formed by the first dispensing. When forming the reinforcing part 201, the adhesion to the optical fiber 1 does not need to be considered, but the bonding force between the optical fibers 1 can be directly enhanced.

[0038] Furthermore, as an optional embodiment of the present invention, the axial length of the adhesive strip 2 in the present invention is 15~25mm, the adhesive strip 2 has three reinforcing parts 201, the reinforcing parts 201 have an axial length of 1~2mm, and the average distance from the half-profile curve of the cross-section of the reinforcing part 201 to the reference plane is 0.1~0.15mm. The adhesive strip 2 of the flexible optical fiber ribbon under this structural design has good bonding force, and the additional attenuation of the optical fiber 1 is also at a low level.

[0039] Furthermore, such as Figures 4-6 As shown, in an optional embodiment of the present invention, the maximum distance from the half-profile of the reinforcing part 201 to the reference line is not greater than the radius of the optical fiber 1. The higher the protrusion height of the reinforcing part 201, the larger the bonding area between the adhesive strip 2 and the optical fiber 1 during molding, which in turn increases the additional attenuation of the optical fiber 1. The present invention limits the additional attenuation of the adhesive strip 2 by limiting the highest protrusion position of the reinforcing part 201; on the other hand, when the reinforcing part 201 protrudes beyond the end face of the optical fiber 1, the reinforcing part 201 itself is prone to contact with other optical fibers 1, resulting in stress concentration inside the optical cable, causing random additional attenuation of the optical fiber 1.

[0040] The method for obtaining the cross-sectional profile of the adhesive strip 2 in this invention is as follows: First, the flexible optical fiber strip is laid flat, and then two adjacent optical fibers 1 are pulled along the parallel arrangement direction of the optical fibers 1. The adhesive strip 2 connected to it is torn through the two optical fibers 1 to obtain the cross-sectional profile of the adhesive strip 2. Then, the optical fiber 1 with the cross-sectional profile of the adhesive strip 2 is placed under an electron microscope for imaging.

[0041] The flexible optical fiber ribbon prepared by the method of this invention is shown in the electron microscope image. Figure 9 As shown.

[0042] Furthermore, by tearing two adjacent optical fibers 1, the cross-sectional structure of the adhesive strip 2 is photographed, and a microscopic projection is obtained through electron microscopy. The cross-sectional profile of the adhesive strip 2 is acquired and a curve is fitted. Based on the fitted curve, the area enclosed by the half-profile curve of the cross-section and the reference plane is calculated, such as... Figure 10 As shown. It is worth noting that by fitting the profile curve of the adhesive strip 2, the tolerance effect caused by the slight fluctuations on the surface of the adhesive strip 2 can be ignored, so that the axial length of the reinforcing part 201, the number of reinforcing parts 201, and the average distance from the reinforcing part 201 to the reference surface calculated by the present invention can accurately reflect the influence of the adhesive strip 2 in the flexible optical fiber ribbon on the additional attenuation and bonding force of the optical fiber 1.

[0043] Furthermore, the present invention also includes an optical cable comprising the aforementioned flexible optical fiber ribbon.

[0044] First set of embodiments: Multiple optical fibers 1 are arranged side-by-side, with adjacent optical fibers 1 connected side-by-side. Adhesive is applied intermittently between adjacent optical fibers 1, and the amount of adhesive applied is controlled in different embodiments. The adhesive is then cured to form flexible optical fiber ribbons with different total lengths of reinforcing portions 201. Electron microscope images of different flexible optical fiber ribbons are taken, and image analysis is used to obtain the set threshold of the adhesive strip 2, the length of the reinforcing portion 201, and the connecting portion 202. The ratio of the total length of the reinforcing portion 201 extending along the axial direction of the optical fiber 1 to the length of the adhesive strip 2 extending along the axial direction of the optical fiber 1 is obtained. The breaking force and attenuation loss of the flexible optical fiber ribbons with different lengths of reinforcing portions are tested respectively. The specific test data are shown in Table 1.

[0045] Table 1

[0046] Through the first set of embodiments, it can be seen that when the ratio of the sum of the lengths of the reinforcing portion 201 in the flexible optical fiber ribbon along the axial direction of the optical fiber 1 to the axial length of the adhesive strip 2 is within a set range, the bonding force (separation breaking force) and the average additional attenuation of the flexible optical fiber ribbon are both within a reasonable range.

[0047] Second set of embodiments: Multiple optical fibers 1 arranged side-by-side, with a certain gap between adjacent fibers 1, are selected. Adhesive is applied intermittently between adjacent fibers 1, and the amount of adhesive applied is controlled in different embodiments. The adhesive is then cured to form flexible optical fiber ribbons with different total lengths of reinforcing portions 201. Electron microscope images of different flexible optical fiber ribbons are taken, and image analysis is used to analyze the electron microscope images of the adhesive strip 2. The set threshold of the adhesive strip 2, the length of the reinforcing portion 201, and the connecting portion 202 are calculated to obtain the ratio of the total length of the reinforcing portion 201 extending along the axial direction of the optical fiber 1 to the length of the adhesive strip 2 extending along the axial direction of the optical fiber 1. The breaking force and attenuation loss of the flexible optical fiber ribbons with different lengths of reinforcing portions are tested respectively. The specific test data are shown in Table 2.

[0048] Table 2

[0049] Through the second set of embodiments, it can be seen that, regardless of whether the optical fiber has a gap or is directly connected, the bonding force and average additional attenuation of the optical fiber 1 can be effectively controlled by controlling the length of the reinforcing part 201 on the adhesive strip 2 along the axial direction of the optical fiber 1.

[0050] Third set of embodiments: Multiple optical fibers 1 arranged side-by-side, with a certain gap between adjacent fibers 1, are selected. Adhesive is applied intermittently between adjacent fibers 1, and the amount of adhesive applied is controlled in different embodiments. The adhesive is then cured to form flexible optical fiber ribbons with different lengths of individual reinforcing parts 201. Electron microscope images of different flexible optical fiber ribbons are taken, and image analysis is used to analyze the electron microscope images of the adhesive strip 2. The set threshold of the adhesive strip 2, the length of the reinforcing part 201, and the connecting part 202 are calculated respectively, and the ratio of the total length of the reinforcing part 201 extending along the optical fiber axis to the length of the adhesive strip 2 extending along the optical fiber 1 axis is obtained. The breaking force and attenuation loss of flexible optical fiber ribbons with reinforcing parts of different lengths are tested respectively. The specific test data are shown in Table 3.

[0051] Table 3

[0052] Through the third set of embodiments, it can be seen that when the length of a single reinforcing part 201 along the axial direction of the optical fiber 1 is too long, it will cause the breaking force and additional attenuation of the flexible optical fiber ribbon to increase significantly, resulting in the average additional attenuation of the optical fiber exceeding the standard.

[0053] Fourth set of examples: Multiple optical fibers 1 arranged side-by-side are selected, with a certain gap between adjacent optical fibers 1. Adhesive is intermittently applied between adjacent optical fibers 1. Pre-application is performed first, followed by secondary application of adhesive on the adhesive droplets. The amount of adhesive applied in different embodiments is controlled, and the adhesive is cured to form flexible optical fiber ribbons with different total lengths of reinforcing portions 201. Electron microscope images of different flexible optical fiber ribbons are taken, and image analysis of the electron microscope images at the bonding portion is used to calculate the set threshold of the adhesive strip 2, the length of the reinforcing portion 201, and the connecting portion 202, respectively, to obtain the ratio of the total length of the reinforcing portion 201 extending along the optical fiber axis to the length of the adhesive strip 2 extending along the optical fiber 1 axis. The breaking force and attenuation loss of flexible optical fiber ribbons with reinforcing portions of different lengths are tested respectively, and the specific test data are shown in Table 4.

[0054] Table 4

[0055] Through the fourth set of embodiments, it can be seen that when the secondary dispensing molding reinforcement part 201 is used, the bonding force and average additional attenuation of the molded flexible optical fiber ribbon can be controlled within a reasonable range.

[0056] Fifth set of examples: Multiple optical fibers 1 are arranged side by side, with a certain gap between adjacent optical fibers 1. Adhesive is applied intermittently between adjacent optical fibers 1. The amount of adhesive applied in different embodiments is controlled to form different numbers of reinforcing parts 201 on a single bonding part. The adhesive is cured to form flexible optical fiber ribbons with different numbers of reinforcing parts 201. Electron microscope images of different flexible optical fiber ribbons are taken. Image analysis of the electron microscope images of the bonding strip 2 is used to calculate the set threshold of the bonding strip 2, the length of the reinforcing part 201 and the connecting part 202, and to obtain the ratio of the total length of the reinforcing part 201 extending along the axial direction of the optical fiber 1 to the length of the bonding strip 2 extending along the axial direction of the optical fiber 1. The breaking force and attenuation loss of flexible optical fiber ribbons with reinforcing parts of different lengths are tested respectively. The specific test data are shown in Table 5.

[0057] Table 5

[0058] Through the fifth set of embodiments, it can be seen that when the number of reinforcing parts 201 on a single adhesive strip 2 is too large (more than 10), it will also seriously increase the bonding force and average additional attenuation of the flexible optical fiber ribbon.

[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible optical fiber ribbon, characterized in that, include: Multiple optical fibers bonded by axially discontinuous adhesive strips; The plane containing the central axis of the multiple optical fibers is used as the reference plane; The profile of the adhesive strip, on one half of its cross-sectional contour curve, satisfies the following condition: in, The distance from the reference plane is greater than The continuous section is the reinforcement section. To strengthen the department The number, , To strengthen the department axial length, This is the area enclosed by the semi-profile curve of the cross section and the reference plane; The axial length of the adhesive strip; The axial poles of the adhesive strip are used as the dividing lines, and the curve of the cross-sectional profile of the adhesive strip between the two poles is called the semi-profile curve.

2. The flexible optical fiber ribbon according to claim 1, characterized in that, Any of the reinforcing parts in the adhesive strip axial length The thickness is 0.5~5mm.

3. The flexible optical fiber ribbon according to claim 1 or 2, characterized in that, The adhesive strip has 4 to 10 reinforcing parts.

4. The flexible optical fiber ribbon according to claim 1, characterized in that, The average distance from the half-profile curve of any of the aforementioned reinforcing sections to the reference plane It is 0.1~0.2mm.

5. The flexible optical fiber ribbon according to claim 1, characterized in that, The adhesive strip has the reinforcing portion and the connecting portion arranged alternately along the axial direction; in, The distance to the reference plane is less than or equal to The continuous section is the connecting part. Number the connecting parts. ; Any of the connecting parts in the adhesive strip axial length The diameter is 15~60mm.

6. The flexible optical fiber ribbon according to claim 1, characterized in that, The reinforcing part has gaps between itself and the two adjacent optical fibers on both sides.

7. The flexible optical fiber ribbon according to claim 1, characterized in that, The breaking force of two adjacent optical fibers at the adhesive strip is 0.05~0.5N.

8. The flexible optical fiber ribbon according to claim 1, characterized in that, The adhesive strip is formed by two-stage dispensing, and at least a portion of the reinforcing part is formed by a second dispensing.

9. The flexible optical fiber ribbon according to claim 1, characterized in that, The maximum distance from the half-profile of the reinforcing section to the baseline is not greater than the radius of the optical fiber.

10. An optical cable, characterized in that, Includes the flexible optical fiber ribbon as described in any one of claims 1 to 9.

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