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WO2025192279A1 - Structure de faisceau de fibres optiques et procédé de fabrication de structure de faisceau de fibres optiques - Google Patents

Structure de faisceau de fibres optiques et procédé de fabrication de structure de faisceau de fibres optiques

Info

Publication number
WO2025192279A1
WO2025192279A1 PCT/JP2025/006561 JP2025006561W WO2025192279A1 WO 2025192279 A1 WO2025192279 A1 WO 2025192279A1 JP 2025006561 W JP2025006561 W JP 2025006561W WO 2025192279 A1 WO2025192279 A1 WO 2025192279A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
ferrule
diameter
holding hole
fiber holding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/006561
Other languages
English (en)
Japanese (ja)
Inventor
貴広 菊地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of WO2025192279A1 publication Critical patent/WO2025192279A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/40—Mechanical coupling means having fibre bundle mating means

Definitions

  • This disclosure relates to an optical fiber bundle structure and a method for manufacturing an optical fiber bundle structure.
  • Patent Document 1 describes a method for manufacturing a multicore interface.
  • the coating layer at the tip of an optical fiber is removed and the optical fiber is immersed in an etching solution.
  • the optical fiber is pulled out of the etching solution at a predetermined speed, forming a tapered section at the tip whose outer diameter is equal to the core spacing of the multicore fiber.
  • a straight section with a constant outer diameter is formed at the tip of the tapered section, thereby producing a processed optical fiber.
  • the multiple processed optical fibers thus produced are then bundled together and inserted into the through-hole of a ferrule.
  • Patent Document 2 describes a fiber bundle connector.
  • the fiber bundle connector includes an optical fiber group containing multiple optical fibers and a ferrule that holds the optical fiber group.
  • the optical fiber has a small diameter section, a medium diameter section with a larger diameter than the small diameter section, and a large diameter section with a larger diameter than the medium diameter section, arranged in that order.
  • the ferrule has a fiber hole through which the multiple small diameter sections can be inserted in a close-packed arrangement, and a guide hole that tapers away from the entrance of the fiber hole. With the small diameter sections of the multiple optical fibers located within the fiber hole, the medium diameter sections are located within the guide hole and the large diameter sections are located outside the ferrule.
  • Patent Document 3 describes an optical fiber bundle structure comprising a ferrule including a fiber accommodating portion and multiple optical fibers accommodated in the fiber accommodating portion.
  • the optical fiber includes a first diameter portion and a second diameter portion having a diameter larger than that of the first diameter portion.
  • the fiber accommodating portion includes a first accommodating portion, a second accommodating portion having an inner diameter larger than that of the first accommodating portion, and an inner diameter conversion portion connecting the first accommodating portion and the second accommodating portion by a tapered surface.
  • the first diameter portion of each optical fiber is located in the first accommodating portion, the inner diameter conversion portion, and the second accommodating portion.
  • Each optical fiber is separated from the inner surface of the ferrule at the inner diameter conversion portion.
  • the optical fiber bundle structure disclosed herein comprises a plurality of optical fibers, a first ferrule having a first optical fiber holding hole into which the plurality of optical fibers are inserted, a second ferrule aligned with the first ferrule in the direction in which the plurality of optical fibers extend and having a second optical fiber holding hole into which the plurality of optical fibers are inserted, and a housing component that houses at least a portion of the first ferrule and at least a portion of the second ferrule and secures the first and second ferrules.
  • Each of the plurality of optical fibers includes a first diameter portion, a second diameter portion having a diameter larger than the first diameter portion, a third diameter portion having a diameter larger than the second diameter portion, and a coating portion having a diameter larger than the third diameter portion.
  • the minimum inner diameter of the first optical fiber holding hole is equal to or smaller than the minimum inner diameter of the second optical fiber holding hole. At least a portion of the plurality of first diameter portions are disposed in the first optical fiber holding hole. At least a portion of the plurality of second diameter portions are disposed in the second optical fiber holding hole.
  • FIG. 1 is a cross-sectional view showing an optical fiber bundle structure according to an embodiment.
  • FIG. 2 is a cross-sectional view showing a second ferrule and a plurality of optical fibers of the optical fiber bundle structure according to the embodiment.
  • FIG. 3 is a diagram for explaining steps in a method for manufacturing an optical fiber bundle structure according to an embodiment.
  • FIG. 4 is a cross-sectional view showing an optical fiber bundle structure according to a first modification.
  • FIG. 5 is a cross-sectional view showing an optical fiber bundle structure according to a second modification.
  • FIG. 6 is a cross-sectional view showing an optical fiber bundle structure according to a third modification.
  • an optical fiber bundle structure that includes a plurality of optical fibers having different outer diameters depending on the position of the optical fiber, and a ferrule for holding the plurality of optical fibers.
  • the optical fiber bundle structure may be connected to an optical amplifier including a multicore fiber.
  • each of the plurality of optical fibers in the optical fiber bundle structure is optically coupled to each of the plurality of cores in the multicore fiber.
  • the present disclosure aims to provide an optical fiber bundle structure that can reduce optical loss, and a method for manufacturing an optical fiber bundle structure.
  • optical loss can be reduced.
  • An optical fiber bundle structure includes: a plurality of optical fibers; a first ferrule having a first optical fiber holding hole into which the plurality of optical fibers are inserted; a second ferrule aligned with the first ferrule along the direction in which the plurality of optical fibers extend and having a second optical fiber holding hole into which the plurality of optical fibers are inserted; and a housing component that houses at least a portion of the first ferrule and at least a portion of the second ferrule and secures the first ferrule and the second ferrule.
  • Each of the plurality of optical fibers includes a first diameter portion, a second diameter portion having a diameter larger than the first diameter portion, a third diameter portion having a diameter larger than the second diameter portion, and a coating portion having a diameter larger than the third diameter portion.
  • the minimum inner diameter of the first optical fiber holding hole is equal to or smaller than the minimum inner diameter of the second optical fiber holding hole. At least a portion of the plurality of first diameter portions is disposed in the first optical fiber holding hole. At least a portion of the plurality of second diameter portions is disposed in the second optical fiber holding hole.
  • each of the multiple optical fibers has a first diameter portion, a second diameter portion having a diameter larger than the first diameter portion, a third diameter portion having a diameter larger than the second diameter portion, and a coating portion having a diameter larger than the third diameter portion.
  • the optical fiber bundle structure includes a first ferrule having a first optical fiber holding hole and a second ferrule having a second optical fiber holding hole, and the minimum inner diameter of the first optical fiber holding hole is equal to or smaller than the minimum inner diameter of the second optical fiber holding hole.
  • At least a portion of the first diameter portion of the optical fiber is disposed in the first optical fiber holding hole, and at least a portion of the second diameter portion of the optical fiber is disposed in the second optical fiber holding hole. Even when the optical fiber has the first diameter portion, which is the portion with the small outer diameter, disposing the first diameter portion in the first optical fiber holding hole and the second diameter portion in the second optical fiber holding hole reduces bending of the optical fiber. This reduces optical loss due to bending.
  • the inner diameter of the first optical fiber holding hole may be constant along the direction in which the multiple optical fibers extend.
  • the constant inner diameter of the first optical fiber holding hole simplifies the configuration of the first ferrule, thereby contributing to reducing the cost of the first ferrule.
  • the housing component may have an injection hole through which adhesive can be injected into the housing component.
  • the first ferrule and the second ferrule are fixed inside the housing component by injecting adhesive into the housing component through the injection hole. Therefore, the first ferrule and the second ferrule can be easily fixed to the housing component.
  • an optical fiber bundle structure In the method for manufacturing an optical fiber bundle structure, it is possible to insert multiple optical fibers into the second optical fiber holding hole of the second ferrule, and then insert multiple first diameter portions into the first optical fiber holding hole of the first ferrule. Therefore, an optical fiber bundle structure having the above-mentioned first and second ferrules can be easily manufactured.
  • the optical fiber 10 is, for example, a single-core fiber.
  • the multiple optical fibers 10 are arranged in parallel in a direction perpendicular to direction D1.
  • the optical fiber bundle structure 1 has four optical fibers 10.
  • the four optical fibers 10 are arranged in a square lattice pattern in a plane perpendicular to direction D1.
  • "Arranged in a square lattice pattern” means that the four optical fibers 10 are arranged so that the center points of the four optical fibers 10 form the vertices of a square in a plane perpendicular to direction D1.
  • the four optical fibers 10 may be arranged in a close-packed manner, but this is not limited to this.
  • the number of optical fibers 10 is four will be described.
  • the number of optical fibers 10 may be other than four (for example, 7 or 19) and is not particularly limited.
  • the four optical fibers 10 are arranged so that the center points of the four optical fibers 10 form a quadrangular shape (for example, a rectangular shape) in a plane perpendicular to direction D1.
  • Each of the multiple optical fibers 10 includes a first diameter portion 11, a second diameter portion 12 having a diameter larger than that of the first diameter portion 11, a third diameter portion 13 having a diameter larger than that of the second diameter portion 12, and a coating portion 15 having a diameter larger than that of the third diameter portion 13.
  • the outer diameter of the first diameter portion 11 is 15 ⁇ m or more and 30 ⁇ m or less
  • the outer diameter of the second diameter portion 12 is 30 ⁇ m or more and 60 ⁇ m or less
  • the outer diameter of the third diameter portion 13 is 75 ⁇ m or more and 130 ⁇ m or less.
  • the outer diameter of the coating portion 15 is 250 ⁇ m.
  • each optical fiber 10 has a first diameter changing portion 11b located between the first diameter portion 11 and the second diameter portion 12, and a second diameter changing portion 12b located between the second diameter portion 12 and the third diameter portion 13.
  • the first diameter changing portion 11b is a portion where the outer diameter of the optical fiber 10 increases from the first diameter portion 11 toward the second diameter portion 12.
  • the second diameter changing portion 12b is a portion where the outer diameter of the optical fiber 10 increases from the second diameter portion 12 toward the third diameter portion 13.
  • the first ferrule 20 is made of, for example, ceramics such as zirconia, glass such as borosilicate, plastic, or metal.
  • the first ferrule 20 has first optical fiber holding holes 21 into which multiple optical fibers 10 are inserted.
  • the inner diameter of the first optical fiber holding holes 21 is constant along the direction D1 in which the multiple optical fibers 10 extend.
  • the first ferrule 20 does not have any portions in the first optical fiber holding holes 21 where the inner diameter changes.
  • At least some of the multiple first diameter portions 11 are arranged in the first optical fiber holding holes 21.
  • the center points of the four first diameter portions 11 are arranged in a square lattice pattern in a plane perpendicular to the direction D1. In this case, the center points of the four first diameter portions 11 in the first optical fiber holding holes 21 are arranged to form a square shape in a plane perpendicular to the direction D1.
  • the first ferrule 20 has an end face 22 exposed to the outside of the optical fiber bundle structure 1.
  • the tip faces 11c of the multiple first diameter portions 11 of the optical fiber 10 are exposed at the end face 22.
  • the end face 22 of the first ferrule 20 and the multiple tip faces 11c are polished. Therefore, the end face 22 is flat along with the tip faces 11c, and is located on the same plane as the multiple tip faces 11c.
  • the first ferrule 20 has an end face 24 located at the end opposite to the end face 22, and an optical fiber insertion portion 23 extending from the end face 24 toward the first optical fiber holding hole 21.
  • the optical fiber insertion portion 23 is connected to the first optical fiber holding hole 21.
  • the optical fiber insertion portion 23 is a hole for inserting multiple optical fibers 10 into the first optical fiber holding hole 21.
  • the end face 24 is annular, and the optical fiber insertion portion 23 is located inside the end face 24.
  • the inner diameter of the optical fiber insertion portion 23 decreases from the end face 24 toward the first optical fiber holding hole 21. This makes it easy to insert multiple optical fibers 10 (first diameter portion 11) into the first optical fiber holding hole 21.
  • the second ferrule 30 is made of, for example, ceramics such as zirconia, glass such as borosilicate, plastic, or metal.
  • the length of the second ferrule 30 in direction D1 is longer than the length of the first ferrule 20 in direction D1.
  • a portion of the second ferrule 30 is exposed to the outside of the optical fiber bundle structure 1 between the housing component 40 and the coating housing component 50.
  • the second ferrule 30 has second optical fiber holding holes 31 into which multiple optical fibers 10 are inserted.
  • the inner diameter of the second optical fiber holding hole 31 changes depending on the position of the second optical fiber holding hole 31 in direction D1.
  • the second ferrule 30 has a portion where the inner diameter of the second optical fiber holding hole 31 changes.
  • the second optical fiber holding hole 31 includes a thin diameter section 31b, a thick diameter section 31c where the inner diameter of the second optical fiber holding hole 31 is larger than that of the thin diameter section 31b, and a transition section 31d located between the thin diameter section 31b and the thick diameter section 31c.
  • the second optical fiber holding hole 31 has multiple second diameter sections 12, multiple second diameter change sections 12b, and multiple third diameter sections 13 arranged therein.
  • multiple second diameter portions 12 are arranged in the small diameter portion 31b, and multiple third diameter portions 13 are arranged in the large diameter portion 31c.
  • the center points of the four second diameter portions 12 are arranged in a square lattice pattern in a plane perpendicular to direction D1
  • the four third diameter portions 13 are arranged in a square lattice pattern in a plane perpendicular to direction D1.
  • Multiple second diameter change portions 12b are arranged in the transition portion 31d. In the transition portion 31d, the four second diameter change portions 12b may also be arranged in a square lattice pattern in a plane perpendicular to direction D1.
  • the second ferrule 30 has an end face 32 facing the first ferrule 20.
  • Figure 2 is an enlarged cross-sectional view of the periphery of the end face 32 of the second ferrule 30.
  • the first diameter changing portion 11b of the optical fiber 10 is located between the first ferrule 20 and the second ferrule 30.
  • the first diameter changing portion 11b does not enter the second optical fiber holding hole 31.
  • a portion of the first diameter changing portion 11b may enter the second optical fiber holding hole 31, and the first diameter changing portion 11b may protrude from the end face 32.
  • the second ferrule 30 has an end face 34 located at the end opposite to the end face 32, and an optical fiber insertion section 33 extending from the end face 34 toward the second optical fiber holding hole 31.
  • the optical fiber insertion section 33 is connected to the second optical fiber holding hole 31 (e.g., the large-diameter section 31c).
  • the optical fiber insertion section 33 is a hole for inserting multiple optical fibers 10 into the second optical fiber holding hole 31.
  • the end face 34 is annular, and the optical fiber insertion section 33 is located inside the end face 34.
  • the inner diameter of the optical fiber insertion section 33 decreases from the end face 34 toward the second optical fiber holding hole 31. This makes it easy to insert multiple optical fibers 10 into the second optical fiber holding hole 31.
  • the minimum inner diameter of the first optical fiber holding hole 21 is equal to or smaller than the minimum inner diameter of the second optical fiber holding hole 31. In this embodiment, the minimum inner diameter of the first optical fiber holding hole 21 is smaller than the minimum inner diameter of the second optical fiber holding hole 31.
  • the minimum inner diameter of the first optical fiber holding hole 21 is large enough to allow multiple first diameter sections 11 to be inserted, and the minimum inner diameter of the second optical fiber holding hole 31 is large enough to allow multiple second diameter sections 12 to be inserted.
  • the housing component 40 is made of glass such as borosilicate, plastic, ceramics such as zirconia, or metal.
  • the housing component 40 is a component that secures the first ferrule 20 and the second ferrule 30.
  • the housing component 40 is, for example, cylindrical.
  • a portion of the first ferrule 20 and a portion of the second ferrule 30 are inserted inside the housing component 40.
  • the optical fiber insertion portion 23 of the first ferrule 20 and the end face 32 of the second ferrule 30 are inserted inside the housing component 40.
  • the end face 22 of the first ferrule 20 and the optical fiber insertion portion 33 of the second ferrule 30 are not inserted inside the housing component 40.
  • the first diameter changing portion 11b of the optical fiber 10 is disposed inside the housing component 40. This protects the first diameter changing portion 11b inside the housing component 40.
  • the optical fiber bundle structure 1 has an adhesive 60 that fixes the first ferrule 20 and the second ferrule 30 to the housing component 40.
  • the housing component 40 has an injection hole 41 through which the adhesive 60 can be injected into the interior of the housing component 40.
  • the adhesive 60 is filled in the portion between the first ferrule 20 and the second ferrule 30 inside the housing component 40.
  • the adhesive 60 may be a thermosetting epoxy adhesive, an ultraviolet-curing epoxy adhesive, or an acrylic adhesive.
  • the refractive index of the adhesive 60 is lower than the refractive index of glass.
  • the housing component 40 includes a first cylindrical portion 42 into which the first ferrule 20 is inserted, and a second cylindrical portion 43 into which the second ferrule 30 is inserted.
  • the first cylindrical portion 42 and the second cylindrical portion 43 are aligned along direction D1.
  • the injection hole 41 is formed in the second cylindrical portion 43.
  • the injection hole 41 penetrates the second cylindrical portion 43.
  • the first cylindrical portion 42 is thicker than the second cylindrical portion 43.
  • the outer diameter of the first cylindrical portion 42 is larger than the outer diameter of the second cylindrical portion 43.
  • the first cylindrical portion 42 is a convex portion of the accommodated component 40 that protrudes outward from the accommodated component 40 when viewed along direction D1.
  • the end face 22 and the tip surface 11c of the first ferrule 20 can be easily polished with the end face 22 facing downward.
  • the first cylindrical portion 42 prevents the chuck from shifting, making polishing easy.
  • the configuration of the accommodating component 40 is not limited to the above example.
  • the optical fiber bundle structure 1 may have a split sleeve into which the first ferrule 20 and the second ferrule 30 are inserted.
  • This split sleeve may be made of metal, for example.
  • the coating portion accommodating component 50 is a component that secures the second ferrule 30 and the coating portion 15.
  • the coating portion accommodating component 50 is made of glass such as borosilicate, plastic, ceramics such as zirconia, or metal. Multiple coating portions 15 extend from the coating portion accommodating component 50 in the opposite direction to the first ferrule 20.
  • the coating portion accommodating component 50 is, for example, cylindrical. For example, part of the second ferrule 30 and part of the coating portion 15 fit inside the coating portion accommodating component 50.
  • the optical fiber insertion portion 33 of the second ferrule 30 is inserted inside the coating portion accommodating part 50.
  • the coating portion 15 and the portion of the optical fiber 10 where the coating portion 15 has peeled off are arranged inside the coating portion accommodating part 50.
  • the coating portion 15 and the third diameter portion 13 are arranged inside the coating portion accommodating part 50.
  • the multiple third diameter portions 13 are spaced apart from one another.
  • the multiple third diameter portions 13 that are spaced apart from one another are inserted together into the second optical fiber holding hole 31 of the second ferrule 30.
  • the coating portion accommodating component 50 has a through hole 51 that penetrates the coating portion accommodating component 50 in direction D1.
  • the through hole 51 includes a first hole portion 51b into which the second ferrule 30 is inserted, and a second hole portion 51c that communicates with the first hole portion 51b and into which the coating portion 15 is inserted.
  • the inner diameter of the first hole portion 51b is equal to the outer diameter of the second ferrule 30, and the inner diameter of the second hole portion 51c is large enough to allow multiple coating portions 15 to be inserted.
  • the adhesive 70 is filled in the area between the second ferrule 30 and the multiple coatings 15 inside the coating accommodating component 50.
  • the adhesive 70 may be a thermosetting epoxy adhesive, a UV-curing epoxy adhesive, or an acrylic adhesive.
  • the adhesive 70 may be different from the adhesive 60 described above, and the refractive index of the adhesive 70 does not have to be lower than the refractive index of glass.
  • multiple optical fibers 10 are inserted into the second optical fiber holding holes 31 of the second ferrule 30 (step of inserting multiple optical fibers into the second optical fiber holding holes).
  • multiple optical fibers 10 are passed through the through holes 51 of the coating portion accommodating part 50, and the multiple optical fibers 10 extending from the coating portion accommodating part 50 are inserted into the second optical fiber holding holes 31.
  • the multiple optical fibers 10 are inserted into the second optical fiber holding hole 31 up to the point where the second diameter portions 12 of the multiple optical fibers 10 are located in the second optical fiber holding hole 31. At this time, the positions of the multiple optical fibers 10 inserted into the second ferrule 30 are adjusted so that the second diameter portions 12 of the optical fibers 10 are located in the small diameter portion 31b of the second optical fiber holding hole 31 and the third diameter portions 13 of the optical fibers 10 are located in the large diameter portion 31c of the second optical fiber holding hole 31.
  • the multiple first diameter portions 11 are caused to protrude from the second optical fiber holding hole 31, and the multiple first diameter changing portions 11b are exposed.
  • the multiple first diameter portions 11 may be observed with a camera and their positions adjusted to prevent bending while being inserted into the first optical fiber holding hole 21.
  • the tip surfaces 11c of the multiple first diameter portions 11 do not have to be exposed from the first optical fiber holding hole 21.
  • the multiple first diameter portions 11 may be inserted partway into the first optical fiber holding hole 21, and the end surface 22 of the first ferrule 20 may be polished until the first diameter portions 11 are exposed after the adhesive 60, which will be injected later, has hardened.
  • the first ferrule 20 and second ferrule 30 are fixed to the housing component 40 as shown in FIG. 1 (process of fixing the first ferrule and second ferrule).
  • the first ferrule 20 and second ferrule 30 are inserted into the cylindrical housing component 40, and adhesive 60 is filled into the housing component 40 through the injection hole 41.
  • the adhesive 60 hardens, the first ferrule 20 and second ferrule 30 are fixed inside the housing component 40.
  • each of the multiple optical fibers 10 has a first diameter portion 11, a second diameter portion 12 having a diameter larger than the first diameter portion 11, a third diameter portion 13 having a diameter larger than the second diameter portion 12, and a coating portion 15 having a diameter larger than the third diameter portion 13. Therefore, the outer diameter of the optical fiber 10 can be gradually changed along the direction D1 in which the optical fiber 10 extends.
  • the optical fiber bundle structure 1 has a first ferrule 20 having a first optical fiber holding hole 21 and a second ferrule 30 having a second optical fiber holding hole 31, and the minimum inner diameter of the first optical fiber holding hole 21 is equal to or smaller than the minimum inner diameter of the second optical fiber holding hole 31.
  • At least a portion of the first diameter portion 11 of the optical fiber 10 is disposed in the first optical fiber holding hole 21, and at least a portion of the second diameter portion 12 of the optical fiber 10 is disposed in the second optical fiber holding hole 31.
  • the optical fiber 10 has a first diameter portion 11, which is the portion with a small outer diameter, by arranging the first diameter portion 11 in the first optical fiber holding hole 21 and the second diameter portion 12 in the second optical fiber holding hole 31, bending of the optical fiber 10 can be reduced. This reduces optical loss due to bending.
  • the second optical fiber holding hole 31 may include a thin diameter portion 31b, a thick diameter portion 31c in which the inner diameter of the second optical fiber holding hole 31 is larger than that of the thin diameter portion 31b, and a transition portion 31d located between the thin diameter portion 31b and the thick diameter portion 31c, in which the inner diameter of the second optical fiber holding hole 31 increases from the thin diameter portion 31b toward the thick diameter portion 31c.
  • the inner diameter of the second optical fiber holding hole 31 changes inside the second ferrule 30 along the direction D1 in which the optical fiber 10 extends.
  • the second ferrule 30 By having the second ferrule 30 have a portion where the inner diameter changes, the length of the second ferrule 30 in the direction D1 in which the optical fiber 10 extends can be reduced, and the amount of adhesive used to bond the optical fiber 10 to the second ferrule 30 can be reduced.
  • the inner diameter of the first optical fiber holding hole 21 may be constant along the direction D1 in which the multiple optical fibers 10 extend.
  • the constant inner diameter of the first optical fiber holding hole 21 simplifies the configuration of the first ferrule 20, thereby contributing to reducing the cost of the first ferrule 20.
  • the refractive index of the adhesive 60 injected into the first optical fiber holding hole 21 may be lower than the refractive index of glass.
  • adhesive 60 with a refractive index lower than that of glass is applied to and hardened on the first diameter portion 11 located in the first optical fiber holding hole 21, causing total reflection in the first diameter portion 11 and confining light within the first diameter portion 11. This therefore contributes to further reducing optical loss.
  • Figure 4 is a cross-sectional view showing an optical fiber bundle structure 1A according to a first modified example.
  • the optical fiber bundle structure 1A differs from the optical fiber bundle structure 1 described above in that it includes a first ferrule 20A having a larger outer diameter than the first ferrule 20, and a housing component 40A having a different shape from the housing component 40.
  • the second ferrule 30A has a second optical fiber holding hole 36 that has a different shape from the second optical fiber holding hole 31.
  • the second optical fiber holding hole 36 does not have the aforementioned small diameter portion 31b, large diameter portion 31c, or transition portion 31d.
  • the inner diameter of the second optical fiber holding hole 36 is constant along direction D1.
  • the second ferrule 30A does not have a portion where the inner diameter of the second optical fiber holding hole 36 changes.
  • Multiple second diameter portions 12 are arranged in the second optical fiber holding hole 36.
  • the second diameter changing portion 12b of the optical fiber 10 is located inside the coating portion accommodating component 50 (through hole 51).
  • neither the first ferrule 20 nor the second ferrule 30A has a portion where the inner diameter changes. Therefore, the costs associated with the first ferrule 20 and the second ferrule 30A can be reduced compared to when ferrules with a portion where the inner diameter changes are used.
  • both the first ferrule 20B and the second ferrule 30 have portions where the inner diameter changes.
  • the first diameter changing portion 11b and the second diameter portion 12 are disposed inside the first ferrule 20B, thereby improving the coaxiality of the second diameter portion 12 and the first diameter changing portion 11b with respect to the first diameter portion 11.
  • This makes it easy to adjust the optical fiber 10 when inserting the first diameter portion 11, the first diameter changing portion 11b, and the second diameter portion 12 into the first ferrule 20B. It is possible to narrow the distance between the first ferrule 20B and the second ferrule 30, and it is also possible to bring the first ferrule 20B into contact with the second ferrule 30.
  • an optical fiber bundle structure 1 was described that includes a first ferrule 20 that does not have a portion with a variable inner diameter and a second ferrule 30 that has a portion with a variable inner diameter.
  • an optical fiber bundle structure 1B that includes a first ferrule 20 that does not have a portion with a variable inner diameter and a second ferrule 30A that does not have a portion with a variable inner diameter
  • an optical fiber bundle structure 1C that includes a first ferrule 20B that has a portion with a variable inner diameter and a second ferrule 30 that has a portion with a variable inner diameter
  • an optical fiber bundle structure that includes a first ferrule 20B that has a portion with a variable inner diameter and a second ferrule 30A that does not have a portion with a variable inner diameter may also be used.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Une structure de faisceau de fibres optiques (1) selon un mode de réalisation comprend : une pluralité de fibres optiques (10) ; une première ferrule (20) ayant un premier trou de maintien de fibre optique (21) ; une seconde ferrule (30) ayant un second trou de maintien de fibre optique (31) ; et un composant de boîtier (40) logeant au moins une partie de chacune de la première ferrule (20) et de la seconde ferrule (30). Chacune de la pluralité de fibres optiques (10) comprend une première partie de diamètre (11), une deuxième partie de diamètre (12) ayant un diamètre supérieur à celui de la première partie de diamètre (11), une troisième partie de diamètre (13) ayant un diamètre supérieur à celui de la deuxième partie de diamètre (12), et une partie de recouvrement (15) ayant un diamètre supérieur à celui de la troisième partie de diamètre (13). La valeur minimale du diamètre interne du premier trou de maintien de fibre optique (26) est inférieure ou égale à la valeur minimale du diamètre interne du second trou de maintien de fibre optique (36). Au moins une partie de chacune de la pluralité de premières parties de diamètre (11) est disposée dans le premier trou de maintien de fibre optique (26). Au moins une partie de chacune de la pluralité de deuxièmes parties de diamètre (12) est disposée dans le second trou de maintien de fibre optique (36).
PCT/JP2025/006561 2024-03-11 2025-02-26 Structure de faisceau de fibres optiques et procédé de fabrication de structure de faisceau de fibres optiques Pending WO2025192279A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024036924 2024-03-11
JP2024-036924 2024-03-11

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WO2025192279A1 true WO2025192279A1 (fr) 2025-09-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030002802A1 (en) * 2001-06-29 2003-01-02 John Trezza Multi-piece fiber optic component and manufacturing technique
CN216526383U (zh) * 2021-12-29 2022-05-13 杭州佳量医疗科技有限公司 一种组合式双侧插芯针及夹持器
CN114509848A (zh) * 2022-02-16 2022-05-17 东北大学 内六边形插芯组件及扇入扇出复用装置和制备方法
JP2024009665A (ja) * 2022-07-11 2024-01-23 住友電気工業株式会社 光ファイババンドル構造、光接続構造体、及び、光ファイババンドル構造の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030002802A1 (en) * 2001-06-29 2003-01-02 John Trezza Multi-piece fiber optic component and manufacturing technique
CN216526383U (zh) * 2021-12-29 2022-05-13 杭州佳量医疗科技有限公司 一种组合式双侧插芯针及夹持器
CN114509848A (zh) * 2022-02-16 2022-05-17 东北大学 内六边形插芯组件及扇入扇出复用装置和制备方法
JP2024009665A (ja) * 2022-07-11 2024-01-23 住友電気工業株式会社 光ファイババンドル構造、光接続構造体、及び、光ファイババンドル構造の製造方法

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