Optical fiber array
阅读说明:本技术 光纤阵列 (Optical fiber array ) 是由 荒生侑季 中西哲也 林哲也 于 2019-03-28 设计创作,主要内容包括:一种光纤阵列,具有:多芯光纤,其与长度方向正交的剖面中的玻璃包层的外周形状具有关于第1轴对称且以从第1轴远离的方式凸出的第1凸曲面和第2凸曲面、以及关于与第1轴正交的第2轴相互对称且与第1凸曲面的延长线及第2凸曲面的延长线相比向第2轴侧切入的第1面和第2面;配置部件,其具有与长度方向正交的剖面中的形状为由以从开口朝向槽底而接近的方式相对配置的第1侧面及第2侧面和与开口相对的底面构成的梯形状的槽;以及按压部件,其将玻璃纤维朝向配置部件按压而固定于槽,在第1面与按压部件进行了面接触的状态下,第1凸曲面与第1侧面接触,第2凸曲面与第2侧面接触,或者,第1凸曲面和第2面的边界部分与第1侧面接触,第2面和第2凸曲面的边界部分与第2侧面接触。(An optical fiber array having: a multi-core optical fiber having, in a cross section orthogonal to the longitudinal direction, a glass clad outer peripheral shape having a 1 st convex curved surface and a 2 nd convex curved surface which are symmetrical with respect to a 1 st axis and which protrude so as to be apart from the 1 st axis, and a 1 st surface and a 2 nd surface which are symmetrical with each other with respect to a 2 nd axis orthogonal to the 1 st axis and which are cut into a 2 nd axis side from an extension line of the 1 st convex curved surface and an extension line of the 2 nd convex curved surface; a placement member having a trapezoidal groove in which the shape in a cross section orthogonal to the longitudinal direction is a trapezoidal shape formed by a 1 st side surface and a 2 nd side surface which are disposed so as to face each other so as to approach from the opening toward the groove bottom, and a bottom surface which faces the opening; and a pressing member for pressing the glass fiber toward the disposition member and fixing the glass fiber to the groove, wherein the 1 st convex curved surface is in contact with the 1 st side surface and the 2 nd convex curved surface is in contact with the 2 nd side surface in a state where the 1 st surface is in surface contact with the pressing member, or a boundary portion between the 1 st convex curved surface and the 2 nd surface is in contact with the 1 st side surface and a boundary portion between the 2 nd surface and the 2 nd convex curved surface is in contact with the 2 nd side surface.)
1. An optical fiber array, having:
a multicore fiber including a glass fiber and a resin coating, the glass fiber including a plurality of cores and a cladding surrounding the plurality of cores, the resin coating covering the glass fiber, the cladding having an outer peripheral shape including a 1 st convex curved surface, a 2 nd convex curved surface, a 1 st surface, and a 2 nd surface, the 1 st convex curved surface and the 2 nd convex curved surface in a cross section orthogonal to a longitudinal direction of the multicore fiber being symmetrical with respect to a 1 st axis and protruding away from the 1 st axis, the 1 st surface and the 2 nd surface in the cross section orthogonal to the longitudinal direction of the multicore fiber being symmetrical with respect to a 2 nd axis orthogonal to the 1 st axis and being cut into the multicore fiber on the 2 nd axis side with respect to an extension line of the 1 st convex curved surface and an extension line of the 2 nd convex curved surface;
an arrangement member having a groove for accommodating the glass fiber exposed from the resin coating at one end of the multicore fiber, the arrangement member having a trapezoidal inner peripheral shape of the groove in a cross section orthogonal to a longitudinal direction thereof, the trapezoidal inner peripheral shape including a 1 st side surface and a 2 nd side surface that are disposed to face each other so as to approach from an opening toward a groove bottom, and a bottom surface that faces the opening and is continuous with the 1 st side surface and the 2 nd side surface; and
a pressing member that presses and fixes the glass fiber to the groove toward the placement member,
in the optical fiber array, in a state where a 1 st surface of the clad is in surface contact with the pressing member, the 1 st convex curved surface of the clad is in contact with the 1 st side surface, and the 2 nd convex curved surface is in contact with the 2 nd side surface, or a boundary portion between the 1 st convex curved surface and the 2 nd surface is in contact with the 1 st side surface, and a boundary portion between the 2 nd surface and the 2 nd convex curved surface is in contact with the 2 nd side surface.
2. The optical fiber array of claim 1,
the step shape is a shape in which the 1 st convex curved surface of the clad layer can be in contact with the 1 st side surface of the groove, a boundary portion between the 1 st convex curved surface and the 2 nd surface can be in contact with the bottom surface, and the 2 nd convex curved surface can be in contact with the 2 nd side surface.
3. The optical fiber array of claim 2,
where an angle formed by the 2 nd axis passing through the center of the clad and the 1 st side or the 2 nd side is set to be phi, phi is smaller than or equal to pi/2.
4. The optical fiber array of claim 1,
the step shape is a shape in which the 1 st convex curved surface of the clad layer can be in contact with the 1 st side surface and the bottom surface of the groove, respectively, and the 2 nd surface can be in contact with the 2 nd side surface.
5. The optical fiber array of any of claims 2 to 4,
when an angle formed by an extension line of the 1 st side surface and an extension line of the 2 nd side surface relative to the opening is set as theta, theta is greater than or equal to pi/2.
6. The optical fiber array of any of claims 1 to 5,
the arrangement member arranges the glass fibers exposed from the resin coating at one end of the multicore fiber in parallel.
Technical Field
The present invention relates to optical fiber arrays.
The priority of japanese patent application No. 2018-064385, filed on 29/3/2018, is claimed in the present application, and is incorporated into the present specification in its entirety by reference thereto in accordance with the contents thereof.
Background
The multicore fiber includes a plurality of cores covered with a common cladding, increasing the transmission capacity per 1 fiber. In order to connect 2 multicore fibers to each other, for example, a method is known in which the multicore fibers are first arranged in a V-shaped groove (V-groove), the arrangement of the cores is aligned (also referred to as spin-coring) in a specific direction, and the multicore fibers are pressed from above by a pressing plate.
When the multicore fiber is circular in cross-sectional view, it is difficult to align the arrangement direction of the cores in a specific direction. For this reason, for example, patent document 1 discloses a structure of a multi-core optical fiber in which a portion of the outer surface of a cladding is cut out to form a flat surface, and a cross section perpendicular to the longitudinal direction is substantially D-shaped.
Patent document 1: specification of U.S. patent application No. 2011/0229086
Disclosure of Invention
An optical fiber array according to an embodiment of the present invention includes:
a multicore fiber including a glass fiber and a resin coating, the glass fiber including a plurality of cores and a cladding surrounding the plurality of cores, the resin coating covering the glass fiber, the multicore fiber having a cladding outer peripheral shape including a 1 st convex curved surface, a 2 nd convex curved surface, a 1 st surface, and a 2 nd surface, the shape of the 1 st convex curved surface and the 2 nd convex curved surface in a cross section orthogonal to a longitudinal direction of the multicore fiber being symmetrical with respect to a 1 st axis and protruding away from the 1 st axis, the shape of the 1 st surface and the 2 nd surface in the cross section orthogonal to the longitudinal direction of the multicore fiber being symmetrical with respect to a 2 nd axis orthogonal to the 1 st axis and being cut into the 2 nd axis side of an extension line of the 1 st convex curved surface and an extension line of the 2 nd convex curved surface;
an arrangement member having a groove for accommodating the glass fiber exposed from the resin coating at one end of the multicore fiber, wherein an inner circumferential shape of the groove in a cross section orthogonal to a longitudinal direction of the groove is a trapezoidal shape including a 1 st side surface and a 2 nd side surface which are disposed to face each other so as to approach from the opening toward the bottom of the groove, and a bottom surface which faces the opening and is continuous with the 1 st side surface and the 2 nd side surface; and
a pressing member for pressing the glass fiber toward the disposition member and fixing the glass fiber to the groove,
in the optical fiber array, in a state where the 1 st surface of the clad is in surface contact with the pressing member, the 1 st convex curved surface of the clad is in contact with the 1 st side surface and the 2 nd convex curved surface is in contact with the 2 nd side surface, or a boundary portion between the 1 st convex curved surface and the 2 nd surface is in contact with the 1 st side surface and a boundary portion between the 2 nd surface and the 2 nd convex curved surface is in contact with the 2 nd side surface.
Drawings
Fig. 1A is a perspective view of an optical fiber array according to an embodiment of the present invention.
FIG. 1B is a sagittal sectional view taken along line II-II of FIG. 1A.
Fig. 1C is a partially enlarged view of fig. 1B.
Fig. 1D is a front cross-sectional view of a trapezoidal groove provided in a groove substrate included in the optical fiber array of fig. 1A.
Fig. 2 is a cross-sectional view of the barrel fiber taken perpendicular to the longitudinal direction.
Fig. 3A is a diagram for explaining a relationship between the barrel-shaped glass fiber and the trapezoidal groove.
Fig. 3B is a diagram for explaining a relationship between the barrel-shaped glass fiber and the trapezoidal groove.
Fig. 3C is a diagram for explaining a relationship between the barrel-shaped glass fiber and the trapezoidal groove.
Fig. 4A is a view showing a state before rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 1.
Fig. 4B is a view showing a state after rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 1.
Fig. 5A is a view showing a state before rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 2.
Fig. 5B is a view showing a state after rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 2.
Fig. 6A is a view showing a state before rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 3.
Fig. 6B is a view showing a state before rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 4.
Fig. 6C is a view showing a state before rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 5.
Fig. 6D is a view showing a state before rotational alignment of the barrel-shaped glass fiber arranged in the trapezoidal groove of sample 6.
Detailed Description
First, the contents of the embodiments of the present invention will be described. An optical fiber array according to an embodiment of the present invention (1) includes: a multicore fiber including a glass fiber and a resin coating, the glass fiber including a plurality of cores and a cladding surrounding the plurality of cores, the resin coating covering the glass fiber, the cladding having an outer peripheral shape including a 1 st convex curved surface, a 2 nd convex curved surface, a 1 st surface, and a 2 nd surface, the shape of the 1 st convex curved surface and the shape of the 2 nd convex curved surface in a cross section orthogonal to a longitudinal direction of the multicore fiber being symmetrical with respect to a 1 st axis and protruding away from the 1 st axis, the shape of the 1 st surface and the shape of the 2 nd surface in the cross section orthogonal to the longitudinal direction of the multicore fiber being symmetrical with respect to a 2 nd axis orthogonal to the 1 st axis and being cut into the multicore fiber on the 2 nd axis side with respect to an extension line of the 1 st convex curved surface and an extension line of the 2 nd convex curved surface;
an arrangement member having a groove for accommodating the glass fiber exposed from the resin coating at one end of the multicore fiber, wherein an inner circumferential shape of the groove in a cross section orthogonal to a longitudinal direction of the groove is a trapezoidal shape including a 1 st side surface and a 2 nd side surface which are disposed to face each other so as to approach from the opening toward the bottom of the groove, and a bottom surface which faces the opening and is continuous with the 1 st side surface and the 2 nd side surface; and
a pressing member for pressing the glass fiber toward the disposition member and fixing the glass fiber to the groove,
in the optical fiber array, in a state where the 1 st surface of the clad is in surface contact with the pressing member, the 1 st convex curved surface of the clad is in contact with the 1 st side surface and the 2 nd convex curved surface is in contact with the 2 nd side surface, or a boundary portion between the 1 st convex curved surface and the 2 nd surface is in contact with the 1 st side surface and a boundary portion between the 2 nd surface and the 2 nd convex curved surface is in contact with the 2 nd side surface.
(2) In one embodiment of the optical fiber array of the present invention, the trapezoidal shape is a shape in which the 1 st convex curved surface of the clad can contact the 1 st side surface of the groove, the boundary portion between the 1 st convex curved surface and the 2 nd surface can contact the bottom surface, and the 2 nd convex curved surface can contact the 2 nd side surface. This enables the multicore fiber to be easily rotated in the groove. In this case, (3) may be such that phi is less than or equal to pi/2, where phi is an angle formed by the 2 nd axis passing through the center of the cladding and the 1 st side or the 2 nd side.
(4) In one embodiment of the optical fiber array of the present invention, the trapezoidal shape is a shape in which the 1 st convex curved surface of the clad can be in contact with the 1 st side surface and the bottom surface of the groove, respectively, and the 2 nd surface can be in contact with the 2 nd side surface. This enables the multicore fiber to be easily rotated in the groove. In this case, (5) may be such that θ is greater than or equal to π/2, where θ is an angle formed by an extension of the 1 st side surface and an extension of the 2 nd side surface with respect to the opening.
(6) In one embodiment of the optical fiber array according to the present invention, the arrangement member arranges glass fibers exposed from the resin coating at one end of the multicore fibers in parallel. This makes it possible to easily rotate the multicore fibers arranged in parallel in the grooves.
[ details of embodiments of the present invention ]
Next, a preferred embodiment of the optical fiber array according to the present invention will be described with reference to the drawings.
The multi-core optical fiber described in patent document 1 is not symmetrical with respect to a plane including the central axis and parallel to the flat surface. When the optical fiber is drawn after a portion of the outer surface of the optical fiber base material is cut out to form a flat surface, the optical fiber is likely to warp (curl) toward the flat surface side. In order to solve this problem, it is conceivable that the outer peripheral shape of the multi-core fiber has two opposing flat surfaces. However, if a multicore fiber having two opposing flat surfaces is disposed in the V-groove, the multicore fiber sinks into the bottom of the V-groove, and therefore, there is a problem that it is difficult to align the arrangement direction of the cores in a specific direction. An optical fiber array in which the arrangement direction of a plurality of cores is easily aligned in a desired direction.
Fig. 1A is a perspective view of an optical fiber array 1 according to an embodiment of the present invention. The optical fiber array 1 includes a
FIG. 1B is a sagittal sectional view taken along line II-II of FIG. 1. The
Fig. 1D is a front sectional view of the
Fig. 2 is a cross-sectional view orthogonal to the Z-axis of a barrel fiber. The cores 20 are arranged at equal intervals in the 2 nd axis direction as shown in the drawing. The
Specifically, the 1 st convex
As described above, the outer peripheral shape of the
Fig. 3A, 3B, and 3C are diagrams for explaining the relationship between the barrel-shaped
If the radius of curvature of the 1 st convex curved surface 31 (the 2 nd convex curved surface 32) is r and the distance from the center of the 1 st convex
[ formula 1 ]
If the maximum height of the
[ formula 2 ]
If it relates to h1To solve forThe expression 2 is the following expression 3.
[ formula 3 ]
When the length (the X-axis direction in the figure, the same applies hereinafter) of the
[ formula 4 ]
In this case, a straight line descending from the center of the 1 st convex curved surface 31 (the 2 nd side surface 52) to the point B (the point C) is orthogonal (tangential) to the 1 st side surface 51 (the 2 nd side surface 52).
The depth of the
[ FORMULA 5 ]
On the other hand, as shown in fig. 3B and 3C, the length W of the
[ formula 6 ]
[ formula 7 ]
Further, i ═ r √ (r ═ r- √ (r)2-c2)。
Since f is (d + r)/tan θ and g is r/sin θ, the substitution thereof into formula 6 results in formula 8 below.
[ formula 8 ]
Fig. 4A and 4B are conceptual views for explaining a 1 st specific example of the optical fiber array of the present invention, and fig. 4A is a view showing a state before barrel-shaped glass fibers are rotationally aligned. The
More specifically, the trapezoidal groove 50 (sample 1) shown in fig. 4A has a shape in which the 1 st convex
Fig. 4B is a view showing a state in which barrel-shaped glass fibers are rotated and aligned. After the barrel-shaped
As described above, since the
Fig. 5A and 5B are conceptual views illustrating a 2 nd specific example of the optical fiber array of the present invention, and fig. 5A is a view showing a state before barrel-shaped glass fibers are rotationally aligned. In the specific example of fig. 2, the trapezoidal groove 50 (sample 2) has a shape in which the 1 st convex
Fig. 5B is a view showing a state in which barrel-shaped glass fibers are rotationally aligned. After the barrel-shaped
Fig. 6A, 6B, 6C, and 6D are views showing a state before rotational alignment of barrel-shaped glass fibers. The length W of the
With respect to the trapezoidal groove 50 (set as sample 4) shown in fig. 6B, the depth h of the
In the trapezoidal groove 50 (sample 5) shown in fig. 6C, the angle Φ formed by the 1
In the trapezoidal groove 50 (sample 6) shown in fig. 6D, the angle θ formed by the extension line of the 1
The embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. The scope of the present invention is defined by the claims, not by the above-described meanings, and includes all modifications equivalent in meaning and scope to the claims.
Description of the reference numerals
1 … optical fiber array, 10 … multi-core optical fiber, 11 … resin coating, 12 … barrel-shaped glass fiber, 20 … fiber core, 30 … cladding, 31 … 1 st convex curved surface, 32 … nd 2 nd convex curved surface, 33 … upper surface, 34 … lower surface, 35 … boundary part of 1 st convex curved surface and lower surface, 36 … lower surface and 2 nd convex curved surface boundary part, 40 … groove substrate, 50 … trapezoidal groove, 51 … st 1 side surface, 52 … nd 2 nd side surface, 53 … opening, 54 … bottom surface, 60 … plane plate and 61 … flat surface.
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