WO2024079959A1 - 光コネクタ - Google Patents

光コネクタ Download PDF

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Publication number
WO2024079959A1
WO2024079959A1 PCT/JP2023/026692 JP2023026692W WO2024079959A1 WO 2024079959 A1 WO2024079959 A1 WO 2024079959A1 JP 2023026692 W JP2023026692 W JP 2023026692W WO 2024079959 A1 WO2024079959 A1 WO 2024079959A1
Authority
WO
WIPO (PCT)
Prior art keywords
central axis
optical connector
ferrule
face
plane
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.)
Ceased
Application number
PCT/JP2023/026692
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
諒 翠川
徳洋 石倉
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.)
Fujikura Ltd
Original Assignee
Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to EP23876968.1A priority Critical patent/EP4603884A1/en
Priority to JP2024551230A priority patent/JPWO2024079959A1/ja
Priority to CN202380069255.0A priority patent/CN119968588A/zh
Publication of WO2024079959A1 publication Critical patent/WO2024079959A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical 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
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
    • G02B6/3818—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres of a low-reflection-loss type
    • G02B6/3822—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres of a low-reflection-loss type with beveled fibre ends
    • 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
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3863—Details of mounting fibres in ferrules; Assembly methods; Manufacture fabricated by using polishing techniques

Definitions

  • the present invention relates to an optical connector.
  • Multicore fibers having multiple cores arranged in the cladding are known.
  • the following Patent Document 1 describes an optical connector that connects a pair of multicore fibers by pressing their end faces together.
  • Patent Document 1 describes the conditions for connecting the cores of the multicore fibers by bringing them into physical contact.
  • the end face of this multicore fiber is roughly perpendicular to the longitudinal direction of the multicore fiber, and is curved with a convex center.
  • This optical connector is sometimes called a UPC connector (Ultra-Physical Contact Connector).
  • the present invention aims to provide an optical connector that can suppress reflections at the connection.
  • a first aspect of the present invention comprises a multicore fiber having a plurality of cores, and a ferrule including a through hole into which one end side of the multicore fiber is inserted, wherein an end face of the ferrule overlaps with a spherical surface that is tangent on the central axis to an inclined plane that is inclined with respect to a vertical plane perpendicular to a central axis of the through hole, and the end face on the one end side of the multicore fiber is inclined to the same side as the side on which the inclined plane is inclined with respect to the vertical plane, and a radius of curvature of the spherical surface is B (mm), an amount of eccentricity that is a distance from a vertex position that protrudes most from a line connecting an intersection point of the central axis and the spherical surface to an edge of the end face in a cross section that passes through the central axis and is perpendicular to the inclined plane is C ( ⁇ m),
  • aspect 2 of the present invention is 2.
  • the cores of the opposing multi-core fibers are in stronger physical contact with each other, and reflections at the connection points of the multi-core fibers can be further suppressed.
  • the angle of the inclined plane with respect to the vertical plane is approximately 8 degrees. This is defined in IEC 61755-3-2 and JIS C5965-3-2.
  • the eccentricity C can be reduced by reducing the radius of curvature B (mm) if the deviation ⁇ is constant.
  • the deviation ⁇ of the inclined plane from 8 degrees satisfies the above formula, it can be made easier for the radius of curvature B (mm) and the eccentricity C ( ⁇ m) to satisfy the formula of mode 1.
  • Aspect 4 of the present invention is an optical connector according to any one of aspects 1 to 3, further comprising a guide key provided parallel to the longitudinal direction of the through hole on the housing to which the ferrule is fixed, and characterized in that a key error, which is the angle between the perpendicular to the inclined plane and the central axis of the through hole when viewed along a direction perpendicular to a plane passing through the central axis of the guide key and the central axis of the through hole, is 0.4 degrees or less.
  • Optical connectors may be provided with the above-mentioned guide keys. However, due to manufacturing variations, etc., when the optical connector is placed with the guide keys facing upward and viewed from the side, the direction perpendicular to the inclined plane may be shifted vertically with respect to the longitudinal direction of the through hole indicated by the guide keys. If the key error, which is the amount of this shift, is 0.4 degrees or less, reflections at the connection part of the multicore fiber can be further suppressed.
  • Aspect 5 of the present invention is an optical connector according to any one of aspects 1 to 4, characterized in that the diameter of the ferrule is 2.5 mm.
  • the present invention provides an optical connector that can suppress reflections at the connection.
  • FIG. 1 is a diagram showing an outline of an optical connector according to an embodiment of the present invention.
  • 2 is a diagram showing a cross section perpendicular to the longitudinal direction of the multi-core fiber of FIG. 1.
  • FIG. 2 is a cross-sectional view showing the state of the tip of the ferrule in FIG. 1 .
  • 1 is a cross-sectional view showing a state in which optical connectors are connected to each other.
  • 1 is a diagram showing the relationship between the radius of curvature of a ferrule end face and the amount of eccentricity for physical contact between opposing cores of a multicore fiber.
  • FIG. FIG. 13 is a diagram showing the relationship between the angle, radius of curvature, and amount of eccentricity between an inclined plane and a vertical plane of an end face of a ferrule.
  • FIG. 13 illustrates a key error.
  • 1 is a diagram showing the relationship between a key error and loss due to light reflection at a connection portion when a pair of optical connectors are connected;
  • FIG. 1 is a schematic diagram of an optical connector according to this embodiment.
  • the optical connector 1 according to this embodiment mainly comprises a multicore fiber 10, a ferrule 20, and a housing 30.
  • an example of the optical connector 1 according to this embodiment is an SC connector (Subscriber Connector).
  • the housing 30 houses the ferrule 20, and one end of the ferrule 20 including the tip 22 protrudes from one opening 31 of the housing 30.
  • the multicore fiber 10 protrudes from the side of the housing 30 opposite to the side from which the ferrule 20 protrudes.
  • a guide key 32 is provided on the side of the housing 30 parallel to the longitudinal direction of the through hole 23 of the ferrule 20, which will be described later. Therefore, the central axis 32C of the guide key is parallel to the longitudinal direction of the through hole 23.
  • An engagement claw 33 is provided on the other side of the housing 30.
  • Figure 2 is a diagram showing a cross section perpendicular to the longitudinal direction of the multicore fiber 10 in Figure 1.
  • the multicore fiber 10 includes multiple cores 11, a cladding 12, an inner coating layer 13, and an outer coating layer 14.
  • one core 11 is arranged at the center 10C of the multicore fiber 10, and the other six cores 11 are arranged on the same circle centered on the center 10C. That is, the multiple cores 11 of the multicore fiber 10 of this embodiment are arranged in a so-called 1-6 arrangement.
  • the center 10C coincides with the center of the cladding 12.
  • the diameter of the core 11 is, for example, 4 ⁇ m or more and 10 ⁇ m or less.
  • the inter-core distance is, for example, 35 ⁇ m. In this case, the distance from the center 10C to the core 11 located on the outer periphery is 35 ⁇ m.
  • the six cores 11 arranged on the outer periphery may be arranged so as to be twisted along the longitudinal direction of the multicore fiber 10.
  • the cladding 12 surrounds the outer surface of each core 11.
  • the diameter of the cladding 12 is, for example, 125 ⁇ m.
  • each core 11 is higher than that of the cladding 12.
  • a core 11 is made of, for example, silica glass doped with a dopant such as germanium that increases the refractive index
  • the cladding 12 is made of, for example, silica glass with no dopant added.
  • the core 11 may be made of silica glass with no dopant added
  • the cladding 12 may be made of silica glass doped with a dopant such as fluorine that decreases the refractive index.
  • the inner coating layer 13 coats the outer peripheral surface of the cladding 12, and the outer coating layer 14 coats the outer peripheral surface of the inner coating layer 13.
  • the inner coating layer 13 and the outer coating layer 14 are each made of a resin such as an ultraviolet-curable resin, and the inner coating layer 13 and the outer coating layer 14 are made of different resins.
  • the ferrule 20 of this embodiment includes a cylindrical body 21 and a cylindrical tip 22 that extends from one end of the body 21 and has a smaller diameter than the body 21.
  • the diameter of the ferrule 20 is 2.5 mm.
  • the through holes 23 of the body 21 and the tip 22 are holes of the same diameter.
  • One end side of the multicore fiber 10 from which the inner coating layer 13 and the outer coating layer 14 have been peeled off is inserted into the through hole 23.
  • one end face 15 of the multicore fiber 10 is located within the through hole 23 of the ferrule 20 and is slightly recessed from the end face 25 of the ferrule 20.
  • the ferrule 20 is made of a material that is lower in hardness than the cladding 12 of the multicore fiber 10. An example of such a material is zirconia.
  • Figure 3 is a cross-sectional view showing the tip of the ferrule 20 in Figure 1.
  • an inclined plane FS is assumed to be inclined with respect to a vertical plane FP perpendicular to the central axis 23C of the through hole 23, and a spherical surface SS is assumed to be tangent to this inclined plane FS on the central axis 23C.
  • the end face 25 of the ferrule 20 overlaps this spherical surface SS. Therefore, the end face 25 is part of a spherical surface formed in a convex shape, and is inclined with respect to the vertical plane FP.
  • the inclination of the inclined plane FS with respect to the vertical plane FP is 8 degrees.
  • the opening of the through hole 23 is located approximately in the center of the end face 25 having such an inclined spherical shape. Therefore, the multicore fiber 10 can be seen by looking into the through hole 23.
  • the multicore fiber 10 is inserted into the through hole 23 so that the central axis of the multicore fiber 10 located in the through hole 23 coincides with the central axis 23C of the through hole 23. Therefore, the center 10C of the multicore fiber 10 shown in FIG. 2 is located on the central axis 23C.
  • the end face 15 of the multicore fiber 10 is inclined with respect to the vertical plane FP on the same side as the inclined plane FS.
  • the average inclination of this end face 15 with respect to the vertical plane FP is preferably the same as the inclination of the inclined plane FS with respect to the vertical plane FP.
  • the end face 15 may be an inclined plane as described above, but is preferably a spherical surface. In this case, it is more preferable that the radius of curvature of the end face 15 is the same as the radius of curvature of the spherical surface SS.
  • FIG. 4 is a cross-sectional view showing how the optical connectors are connected to each other. Note that FIG. 4 shows only the tips of the ferrule 20 and the multi-core fiber 10.
  • the end faces 25 of the tip portions 22 of the ferrules 20 facing each other are pressed against each other, and the tip portions 22 are slightly crushed and deformed, so that the end faces 15 of the multi-core fibers 10 come into contact with each other, and the multi-core fibers 10 are connected to each other.
  • the diameter of the ferrule 20 is 2.5 mm
  • the force with which the end faces 25 are pressed against each other is 7.8 N or more and 11.8 N or less, reflection at the connection portion of the multi-core fiber 10 can be further suppressed.
  • the radius of curvature of the spherical surface SS shown in FIG. 3 is B (mm). Also, when the optical connector 1 is viewed in a cross section passing through the central axis 23C and perpendicular to the inclined plane FS, the cross section shown in FIG. 3 is obtained.
  • the apex position TP of the spherical surface SS is defined as the position that protrudes most from the line CL that connects the edge ED of the end face 25.
  • the eccentricity C ( ⁇ m) of the apex position TP is defined as the distance between the intersection CP of the central axis 23C of the through hole 23 and the spherical surface SS and the apex position TP.
  • the distance between the central axis 23C and the center of the core 11 located farthest from the central axis 23C when viewed along the central axis 23C is defined as x ( ⁇ m).
  • x in FIG. 2 is the distance x ( ⁇ m).
  • the end face 15 of the multicore fiber 10 is slightly recessed from the end face 25 of the ferrule 20, and this recession amount is within a maximum value Amaximum ( nm ), which is defined by IEC 61755-3-2 to satisfy the following formula (1):
  • FIG. 5 is a diagram showing the relationship between the radius of curvature B (mm) and the amount of eccentricity C ( ⁇ m) at the end face 25 of the ferrule 20 for physical contact between the opposing cores of the multi-core fiber.
  • one optical connector 1 having a ferrule 20 with a radius of curvature B (mm) of 10.5 (mm) and an amount of eccentricity C ( ⁇ m) of 126.4 ( ⁇ m) was prepared.
  • a plurality of other optical connectors 1 to be connected to this one optical connector 1 were prepared.
  • the other optical connector 1 was connected to the one optical connector 1 to measure the return loss, and a plurality of other optical connectors 1 with a return loss of 55 dB, which is close to the upper limit of the return loss of a general APC connector, were extracted.
  • the return loss is an amount indicating the ratio of the power of the reflected return light to the power of the incident light.
  • fitting was performed based on the radius of curvature B (mm) and the amount of eccentricity C ( ⁇ m) at the end face 25 of the ferrule 20 of each of the extracted other optical connectors 1, and the result was as shown by the thin solid line a in FIG. 5.
  • one optical connector 1 having a ferrule 20 with a radius of curvature B (mm) of 9.1 (mm) and an amount of eccentricity C ( ⁇ m) of 50.4 ( ⁇ m) was prepared.
  • a plurality of other optical connectors 1 to be connected to this one optical connector 1 were prepared.
  • the other optical connector 1 was connected to the one optical connector 1 to measure the return loss, and a plurality of other optical connectors 1 with a return loss of 55 dB were extracted.
  • fitting was performed based on the radius of curvature B (mm) and the amount of eccentricity C ( ⁇ m) at the end face 25 of the ferrule 20 of each of the extracted other optical connectors 1, and the result was as shown by the thick solid line c in FIG. 5.
  • the shape of the end face 25 of the ferrule 20 of the other optical connector 1 that is connected to one optical connector 1 having a ferrule 20 located on the dashed line b and has a return loss of 55 dB or more must be located within a relatively narrow area below the solid line a.
  • the shape of the end face 25 of the ferrule 20 of the other optical connector 1 that is connected to one optical connector 1 having a ferrule 20 located on the dashed line d and has a return loss of 55 dB or more is located within a relatively wide area below the solid line c. Therefore, if the eccentricity of the dashed line b is reduced and the dashed line b is moved downward, the solid line a moves upward.
  • the range of the curvature radius B (mm) and the eccentricity C ( ⁇ m) that the shape of the end face 25 of the ferrule 20 of the other optical connector 1 can take is expanded. Therefore, by repeating this process and finding the point where the dashed line b and the solid line a intersect at each curvature radius and fitting, the dashed line e is obtained. Also, if the eccentricity of the dashed line d is increased and the dashed line d is moved upward, the solid line c moves downward. Repeating this process to find the point where the dashed line d and the solid line c intersect for each radius of curvature and fitting results in the dashed line e.
  • the end face 15 of the multicore fiber 10 may also be spherical, and a difference in angle at the end face may occur between the core 11 located at the center and the core 11 located on the outer periphery.
  • the core 11 located on the outer periphery may have a higher return loss than the core 11 located on the center side, and a lower return loss than the core 11 located on the center side.
  • the return loss is 55 dB or more, it can be brought close to the range of 60 dB or more, which is the range of return loss defined by the standards (IEC 61755-2-2 and JIS C5965-2-2), for all the cores 11. Therefore, reflection at the connection part can be sufficiently suppressed.
  • the radius of curvature B (mm) and the amount of eccentricity C ( ⁇ m) of the end face 25 of the ferrule 20 of at least one of the optical connectors 1 are located in a region below the dotted line f in Fig. 5. This region is expressed by the following formula (3).
  • the angle of the inclined plane FS of the APC connector is set to 8 degrees in IEC 61755-3-2 and JIS C5965-3-2. Therefore, the angle of the inclined plane FS with respect to the vertical plane FP of the end face 25 of the ferrule 20 of this embodiment is also set to 8 degrees. Furthermore, when the above formula (2) is satisfied, when the radius of curvature B (mm) and the amount of eccentricity C ( ⁇ m) of the end face 25 of the ferrule 20 satisfy the formula (2), the angle of the inclined plane FS with respect to the vertical plane FP is often approximately 8 degrees.
  • FIG. 6 is a diagram showing the relationship between the angle of the inclined plane FS of the end face 25 of the ferrule 20 from the vertical plane FP, the radius of curvature B, and the amount of eccentricity C.
  • the angle of the inclined plane FS from the vertical plane FP is described as the oblique grinding angle
  • the radius of curvature B is described as the curvature
  • the amount of eccentricity C is described as the apex deviation.
  • FIG. 7 is a diagram showing the key error, in which the optical connector 1 is viewed along a direction perpendicular to a plane passing through the central axis 32C of the guide key 32 and the central axis 23C of the through hole 23. That is, the optical connector 1 is arranged with the guide key 32 facing upward, and the optical connector 1 is viewed from the side.
  • the end face 25 is inclined toward the side where the inclined plane FS is inclined, and in this embodiment, the inclined plane FS is inclined toward the side where the optical connector 1 is viewed, with the vertical plane FP as the reference.
  • FIG. 3 is a cross-sectional view of a plane passing through the central axis 32C of the guide key 32 and the central axis 23C of the through hole 23.
  • the key error is the angle ⁇ ' that the perpendicular line FSV of the inclined plane FS makes with the central axis 23C of the through hole 23. Therefore, when the optical connector 1 is viewed as shown in FIG. 7, if a key error occurs, the perpendicular line FSV is inclined in the vertical direction. In FIG. 7, each ⁇ ' is drawn larger than the actual value in order to make the drawing easier to see.
  • FIG. 8 is a diagram showing the relationship between the key error and the loss due to the reflection of light at the connection part when connecting a pair of optical connectors 1.
  • the key error is 0.4 degrees or less, the probability of suppressing the loss due to the reflection of light at the connection part is high when connecting optical connectors 1 to each other, and the return loss can be made larger than 60 dB, and the return loss can be suppressed from changing each time the connection is made. Therefore, it can be seen that if the key error is 0.4 degrees or less, there is a tendency to stabilize the return loss while suppressing the loss.
  • the end face 25 of the ferrule 20 overlaps with the spherical surface SS, and the radius of curvature of this spherical surface SS is B (mm), the eccentricity amount C ( ⁇ m) which is the distance from the intersection point CP of the central axis 23C and the spherical surface SS to the apex position TP, and the distance x between the central axis 23C and the center of the core 11 located farthest from the central axis 23C satisfy formula (2). Therefore, by connecting such optical connectors 1 together, the cores 11 of the opposing multi-core fibers 10 come into physical contact with each other, and reflection at the connection portion of the multi-core fibers 10 can be suppressed.
  • a multi-core fiber 10 having seven cores 11 is exemplified, but the number of cores 11 is not limited to seven as long as it is plural.
  • the core 11 does not have to be located at the center of the cladding 12.
  • one end face 15 of the multicore fiber 10 is located within the through hole 23 of the ferrule 20 and is slightly recessed from the end face 25 of the ferrule 20.
  • one end face 15 of the multicore fiber 10 may protrude slightly from the end face 25 of the ferrule 20.
  • the amount of protrusion of the multicore fiber 10 is 100 nm or less.
  • the present invention provides an optical connector that can suppress reflections at the connection, and can be used in fields such as optical communications.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
PCT/JP2023/026692 2022-10-12 2023-07-20 光コネクタ Ceased WO2024079959A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP23876968.1A EP4603884A1 (en) 2022-10-12 2023-07-20 Optical connector
JP2024551230A JPWO2024079959A1 (https=) 2022-10-12 2023-07-20
CN202380069255.0A CN119968588A (zh) 2022-10-12 2023-07-20 光连接器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022164095 2022-10-12
JP2022-164095 2022-10-12

Publications (1)

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WO2024079959A1 true WO2024079959A1 (ja) 2024-04-18

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PCT/JP2023/026692 Ceased WO2024079959A1 (ja) 2022-10-12 2023-07-20 光コネクタ

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EP (1) EP4603884A1 (https=)
JP (1) JPWO2024079959A1 (https=)
CN (1) CN119968588A (https=)
WO (1) WO2024079959A1 (https=)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412747A (en) * 1994-03-07 1995-05-02 Emit Seiko Co., Ltd. Apparatus for and method of polishing optical connectors
JPH1010369A (ja) * 1996-06-20 1998-01-16 T M Kikaku:Kk 光ファイバコネクタ
US5734769A (en) * 1997-01-17 1998-03-31 Adc Telecommunications, Inc. Optical fiber ferrule
JP2015222421A (ja) * 2014-04-30 2015-12-10 Toto株式会社 光レセプタクル
WO2019189312A1 (ja) * 2018-03-30 2019-10-03 住友電気工業株式会社 光コネクタおよび光接続構造
US10989882B2 (en) 2017-03-17 2021-04-27 Sumitomo Electric Industries, Ltd. Optical connector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412747A (en) * 1994-03-07 1995-05-02 Emit Seiko Co., Ltd. Apparatus for and method of polishing optical connectors
JPH1010369A (ja) * 1996-06-20 1998-01-16 T M Kikaku:Kk 光ファイバコネクタ
US5734769A (en) * 1997-01-17 1998-03-31 Adc Telecommunications, Inc. Optical fiber ferrule
JP2015222421A (ja) * 2014-04-30 2015-12-10 Toto株式会社 光レセプタクル
US10989882B2 (en) 2017-03-17 2021-04-27 Sumitomo Electric Industries, Ltd. Optical connector
WO2019189312A1 (ja) * 2018-03-30 2019-10-03 住友電気工業株式会社 光コネクタおよび光接続構造

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EP4603884A1 (en) 2025-08-20
CN119968588A (zh) 2025-05-09
JPWO2024079959A1 (https=) 2024-04-18

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