WO2024095556A1 - ファイバ保持構造及びレーザモジュール - Google Patents

ファイバ保持構造及びレーザモジュール Download PDF

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Publication number
WO2024095556A1
WO2024095556A1 PCT/JP2023/029219 JP2023029219W WO2024095556A1 WO 2024095556 A1 WO2024095556 A1 WO 2024095556A1 JP 2023029219 W JP2023029219 W JP 2023029219W WO 2024095556 A1 WO2024095556 A1 WO 2024095556A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
fiber
ferrule
protective member
holding structure
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/JP2023/029219
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
好浩 田畑
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 CN202380074595.2A priority Critical patent/CN120092196A/zh
Priority to EP23885328.7A priority patent/EP4614202A1/en
Priority to JP2024554265A priority patent/JP7818716B2/ja
Publication of WO2024095556A1 publication Critical patent/WO2024095556A1/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
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0225—Out-coupling of light
    • H01S5/02251—Out-coupling of light using 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4248—Feed-through connections for the hermetical passage of fibres through a package wall

Definitions

  • the present invention relates to a fiber holding structure and a laser module, and in particular to a fiber holding structure that holds an optical fiber to which laser light emitted from a laser element is coupled.
  • an optical fiber is inserted into the fiber holding hole of a ferrule and fixed with an adhesive, and the laser light emitted from the laser element is focused on the end of this optical fiber (see, for example, Patent Document 1).
  • Part of the adhesive that fixes the optical fiber to the ferrule often overflows from the fiber holding hole of the ferrule and hardens around it, but with the recent increase in the power output of laser light, when aligning the laser light or while the laser module is in operation, high power density laser light that is not coupled to the optical fiber may enter the adhesive around the fiber holding hole.
  • Such high power density laser light is absorbed by the adhesive, which may heat up and burn the optical fiber.
  • the present invention was made in consideration of the problems with the conventional technology, and aims to provide a fiber holding structure and laser module that can suppress heat generation caused by light that is not coupled to the optical fiber.
  • the fiber holding structure of aspect 1 of the present invention comprises an optical fiber including a front end, a first fixing portion located behind the front end, and an intermediate portion located between the front end and the first fixing portion, a ferrule having a fiber holding hole for holding the first fixing portion of the optical fiber, an adhesive for fixing the first fixing portion of the optical fiber to the fiber holding hole of the ferrule, and a protective member for covering the ferrule.
  • the protective member includes a support portion that covers the periphery of the ferrule, and a shielding portion that covers the front surface of the ferrule and has a fiber insertion hole formed therein into which the intermediate portion of the optical fiber is inserted.
  • Aspect 2 of the present invention is the fiber holding structure of aspect 1, further comprising a flange that holds a second fixing portion located behind the first fixing portion of the optical fiber.
  • the support portion of the protective member is fixed to the flange.
  • a highly reflective coating layer having a high reflectance for the light coupled to the front end of the optical fiber is formed on the front surface of the shielding portion of the protective member in the fiber holding structure of aspect 1 or 2.
  • Aspect 4 of the present invention is a fiber holding structure according to any one of aspects 1 to 3, in which the protective member is made of a material having a higher thermal conductivity than the optical fiber.
  • Aspect 5 of the present invention is the fiber holding structure of any one of aspects 1 to 4, further comprising a cooling member having a higher thermal conductivity than the optical fiber.
  • the cooling member is arranged so as to contact the support portion of the protective member.
  • Aspect 6 of the present invention is a fiber holding structure according to any one of aspects 1 to 5, in which the intermediate portion of the optical fiber contacts the inner surface of the fiber insertion hole of the shielding portion of the protective member.
  • an air layer is formed between the intermediate portion of the optical fiber and the inner surface of the fiber insertion hole of the shielding portion of the protective member.
  • a laser module that can suppress heat generation due to laser light that is not coupled to an optical fiber. That is, the laser module of aspect 8 of the present invention comprises a laser element capable of emitting laser light, a fiber holding structure of any one of aspects 1 to 7 above, and a lens that couples the laser light emitted from the laser element to the front end of the optical fiber of the fiber holding structure.
  • FIG. 1 is a partial cross-sectional view showing a schematic diagram of a laser module according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a schematic diagram of a fiber holding structure in the laser module shown in FIG.
  • FIG. 3 is a diagram showing the dimensions of the main parts of the fiber holding structure shown in FIG.
  • FIG. 4 is a diagram showing the dimensions of the main parts of the fiber holding structure shown in FIG.
  • FIG. 5 is a cross-sectional view showing a schematic modification of the fiber holding structure shown in FIG.
  • FIG. 6 is a cross-sectional view showing a schematic diagram of another modified example of the fiber holding structure shown in FIG.
  • FIG. 7 is a cross-sectional view showing a schematic diagram of another modified example of the fiber holding structure shown in FIG.
  • a laser module according to the present invention will be described in detail with reference to Figs. 1 to 7.
  • identical or corresponding components are given the same reference numerals and duplicated descriptions will be omitted.
  • the scale and dimensions of each component may be exaggerated or some components may be omitted.
  • terms such as “first” and “second” are used only to distinguish components from each other and do not indicate a specific order or sequence.
  • the laser module 1 is a partial cross-sectional view showing a schematic diagram of a laser module 1 according to a first embodiment of the present invention.
  • the laser module 1 according to this embodiment includes a bottom plate 10, a side wall 11 fixed to the top surface 10A of the bottom plate 10, a cover plate 12 placed on the top of the side wall 11, a submount 13 arranged on the top surface 10A of the bottom plate 10, a high-power semiconductor laser element 14 mounted on the submount 13, lenses 16 and 17 arranged on a lens mount 15 arranged on the top surface 10A of the bottom plate 10, and a fiber holding structure 30 including an optical fiber 20 that propagates the laser light P emitted from the semiconductor laser element 14 to the outside of the laser module 1.
  • the laser element 14 for example, a high-power laser diode of several W to 20 W can be used.
  • a heat sink is connected to the bottom surface of the bottom plate 10.
  • the -X direction in FIG. 1 is referred to as "front” or “forward” and the +X direction is referred to as “rear” or “rear”.
  • the fiber holding structure 30 is provided so as to penetrate one of the side walls 11.
  • a lead 18 is provided so as to penetrate the other side wall 11, and this lead 18 is connected to the laser element 14 by a bonding wire 19.
  • power is supplied to the laser element 14 via the lead 18 and the bonding wire 19, and laser light P is emitted from the laser element 14 in the +X direction.
  • FIG. 2 is a cross-sectional view showing a schematic of the fiber holding structure 30.
  • the fiber holding structure 30 has an optical fiber 20, a ferrule 40 that holds the optical fiber 20, a protective member 50 that covers the ferrule 40, and a flange 32 that is attached to the side wall 11 of the laser module 1.
  • the optical fiber 20 has a front end 21 that is positioned so that the laser light P emitted from the semiconductor laser element 14 and focused by the lens 17 is optically coupled to the front end 21.
  • the optical fiber 20 includes a core, a cladding that covers the outer periphery of the core and has a lower refractive index than the core, and a coating that covers the outer periphery of the cladding and has a lower refractive index than the cladding, but in the portion forward of the flange 32, the coating is removed to expose the cladding.
  • the ferrule 40 is a generally cylindrical member made of, for example, zirconia, and has a fiber holding hole 41 formed in its center that penetrates in the X direction.
  • This fiber holding hole 41 holds a first fixing part 22 located behind the front end 21 of the optical fiber 20.
  • the first fixing part 22 of the optical fiber 20 is fixed in the fiber holding hole 41 by an adhesive 60 filled in the fiber holding hole 41 of the ferrule 40, and part of this adhesive 60 overflows from the fiber holding hole 41 on the front surface 40A of the ferrule 40 and hardens around it, as shown in FIG. 2.
  • the protective member 50 has a cylindrical support portion 51 that covers the outer periphery of the ferrule 40, and a disk-shaped shielding portion 52 that covers the front surface 40A of the ferrule 40.
  • the support portion 51 and the shielding portion 52 may be formed of separate members, or the support portion 51 and the shielding portion 52 may be formed integrally.
  • a fiber insertion hole 53 is formed in the center of the shielding portion 52, into which the intermediate portion 23 located between the front end 21 of the optical fiber 20 and the first fixing portion 22 is inserted.
  • the support portion 51 of the protective member 50 may be fixed to the outer periphery of the ferrule 40 with an adhesive (not shown), or may be fixed to the outer periphery of the ferrule 40 by being fitted into the outer periphery of the ferrule 40.
  • a through hole 34 is formed in the center of the flange 32, penetrating in the X direction.
  • the second fixing portion 24 located behind the first fixing portion 22 of the optical fiber 20 is held in this through hole 34.
  • the support portion 51 of the protective member 50 may be fixed to this flange 32.
  • the support portion 51 of the protective member 50 may be fixed to the flange 32 by press-fitting, or may be fixed to the flange 32 using an adhesive.
  • an adhesive is used to fix the flange 32 and the support portion 51 of the protective member 50, it is considered that the adhesive leaks out to the front surface 40A of the ferrule 40 through the gap between the support portion 51 of the protective member 50 and the outer peripheral surface of the ferrule 40 due to capillary action.
  • the optical fiber 20 extends forward from the shielding portion 52 of the protective member 50, and the front end 21 of the optical fiber 20 is located forward of the shielding portion 52 of the protective member 50.
  • the middle portion 23 of the optical fiber 20 inserted into the fiber insertion hole 53 of the shielding portion 52 of the protective member 50 may be in contact with the inner surface of the fiber insertion hole 53, or may be spaced apart from the inner surface of the fiber insertion hole 53.
  • Figure 2 shows an example in which the middle portion 23 of the optical fiber 20 is spaced apart from the inner surface of the fiber insertion hole 53.
  • the laser light P that is not coupled to the front end 21 of the optical fiber 20 is blocked by the shielding portion 52 of the protective member 50 and is less likely to reach the adhesive 60 present around the fiber holding hole 41 on the front surface 40A of the ferrule 40, so that the amount of laser light P incident on the adhesive 60 can be reduced. Therefore, it is possible to prevent the adhesive 60 from generating heat due to absorption of the laser light P, which would cause the optical fiber 20 to burn.
  • NA n sin ⁇ (1)
  • the distance L from the front surface 40A of the ferrule 40 to the front end 21 of the optical fiber 20 is greater than (G-F)/2 ⁇ tan(asin(NA)), it is possible to prevent the laser light P from being incident on the adhesive 60.
  • the NA of the optical fiber 20 is 0.22
  • the diameter F of the front end 21 of the optical fiber 20 is 125 ⁇ m
  • the diameter G of the adhesive 60 around the fiber holding hole 41 of the ferrule 40 is 500 ⁇ m
  • L>832 ⁇ m Therefore, by making the distance L from the front surface 40A of the ferrule 40 to the front end 21 of the optical fiber 20 longer than 832 ⁇ m, it is possible to prevent the laser light P from being incident on the adhesive 60.
  • the front end 21 of the optical fiber 20 is formed by a cut surface, for example, by laser cleaving.
  • an anti-reflection coating may be formed on the front end 21 of the optical fiber 20 to suppress reflection of light in the wavelength band of the laser light P, so that the laser light P is efficiently coupled to the front end 21 of the optical fiber 20.
  • the diameter F of the front end 21 of the optical fiber 20 is 125 ⁇ m
  • the distance L from the front face 40A of the ferrule 40 to the front end 21 of the optical fiber 20 is 2 mm
  • the distance A along the X direction from the front face 52A of the shielding portion 52 to the front end 21 of the optical fiber 20 is 500 ⁇ m
  • the half angle ⁇ of the laser light Q with respect to the optical axis of the optical fiber 20 is 12.7°
  • the diameter G of the adhesive 60 around the fiber holding hole 41 of the ferrule 40 is 500 ⁇ m
  • the laser light is prevented from directly entering the adhesive 60. Therefore, the power density of the laser light impinging on the adhesive 60 is lower due to the presence of the shielding portion 52, compared to the conventional fiber holding structure.
  • the front end 21 of the optical fiber 20 is located forward of the shielding portion 52 of the protective member 50, but the front end 21 of the optical fiber 20 may be aligned in the X direction with the front surface 52A of the shielding portion 52 of the protective member 50 (may be flush), or the front end 21 of the optical fiber 20 may be located inside the fiber insertion hole 53 behind the front surface 52A of the shielding portion 52 of the protective member 50.
  • the intermediate portion 23 of the optical fiber 20 is spaced from the inner peripheral surface of the fiber insertion hole 53, but as described above, the intermediate portion 23 of the optical fiber 20 may be in contact with the inner peripheral surface of the fiber insertion hole 53. If the shielding portion 52 of the protective member 50 has a higher refractive index than the clad of the optical fiber 20, the intermediate portion 23 of the optical fiber 20 will come into contact with the inner peripheral surface of the fiber insertion hole 53, and the laser light P that is not confined in the core of the optical fiber 20 and leaks into the clad will leak into the shielding portion 52 of the protective member 50, thereby reducing the amount of laser light P that reaches the adhesive 60 around the fiber holding hole 41 of the ferrule 40 described above.
  • an air layer exists between the middle portion 23 of the optical fiber 20 and the inner surface of the fiber insertion hole 53 of the shielding portion 52 of the protective member 50, so the laser light P that is not confined in the core of the optical fiber 20 and leaks into the clad is confined within the clad and propagates downstream.
  • an adhesive 60 that has a lower refractive index than the clad of the optical fiber 20 as the adhesive 60 that fixes the optical fiber 20, the laser light P that leaks into the clad is prevented from leaking into the adhesive 60 that has overflowed around the fiber holding hole 41 of the ferrule 40.
  • a high-reflection coating layer having a high reflectance for light in the wavelength band of the laser light P may be formed on the front surface 52A of the shielding portion 52 of the protective member 50. Furthermore, in addition to the front surface 52A of the shielding portion 52 of the protective member 50, a high-reflection coating layer may also be formed on the front end surface 51A of the support portion 51.
  • a portion of the laser light P that is not coupled to the front end 21 of the optical fiber 20 can be reflected by the high-reflection coating layers of the shielding portion 52 and the support portion 51, so that the possibility that the laser light P that is not coupled to the front end 21 of the optical fiber 20 will reach the adhesive 60 around the fiber holding hole 41 can be further reduced.
  • the shielding part 52 may be made of, for example, quartz glass, sapphire, ceramic, or metal.
  • the support part 51 may be made of a material that absorbs the laser light P more easily than the optical fiber 20 and has a high thermal conductivity, such as metals such as copper or aluminum.
  • the protective member 50 is made of a material that absorbs the laser light P more easily than the optical fiber 20 and has a high thermal conductivity, such as metals such as copper or aluminum.
  • the protective member 50 (support part 51) preferably has a higher thermal conductivity than the optical fiber 20, and preferably has a higher thermal conductivity than the ferrule 40. In this way, by forming the protective member 50 (support part 51) from a material that has a higher thermal conductivity than the optical fiber 20 and the ferrule 40, the heat generated in the optical fiber 20 and the ferrule 40 by the laser light P can be easily released to the outside via the protective member 50.
  • the protective member 50 may also be formed integrally with the side wall 11 (FIG. 1) of the laser module 1.
  • a cooling member 70 having a higher thermal conductivity than the optical fiber 20 may be arranged so as to be in contact with the support portion 51 of the protective member 50.
  • This cooling member 70 may be made of metal such as copper or aluminum, and may have fins for heat dissipation. By arranging such a cooling member 70, heat generated in the optical fiber 20, the ferrule 40, and the protective member 50 can be easily dissipated to the outside via the cooling member 70. Also, such a cooling member 70 may be formed integrally with the side wall 11 (FIG. 1) of the laser module 1.
  • an adhesive may be applied between the cooling member 70 and the flange 32 to fix the cooling member 70 and the flange 32 with the adhesive.
  • a recess 72 may be formed around the support portion 51 of the protective member 50 on the end face of the cooling member 70 on the flange 32 side.
  • a fiber holding structure that can suppress heat generation due to light that is not coupled to an optical fiber.
  • the fiber holding structure according to the present invention can adopt the following configuration.
  • the fiber holding structure includes an optical fiber including a front end, a first fixing portion located rearward of the front end, and an intermediate portion located between the front end and the first fixing portion, a ferrule having a fiber holding hole for holding the first fixing portion of the optical fiber, an adhesive for fixing the first fixing portion of the optical fiber to the fiber holding hole of the ferrule, and a protective member for covering the ferrule.
  • the protective member includes a support portion for covering the periphery of the ferrule, and a shielding portion for covering the front surface of the ferrule and having a fiber insertion hole into which the intermediate portion of the optical fiber is inserted.
  • the fiber holding structure may further include a flange that holds a second fixing portion located behind the first fixing portion of the optical fiber.
  • the support portion of the protective member may be fixed to the flange.
  • a high-reflection coating layer having a high reflectance with respect to the light coupled to the front end of the optical fiber may be formed on a front surface of the shielding portion of the protective member.
  • the protective member may be made of a material having a higher thermal conductivity than the optical fiber.
  • the fiber-holding structure may further include a cooling member having a thermal conductivity higher than that of the optical fiber.
  • the cooling member is disposed so as to contact the support portion of the protective member. Such a cooling member makes it easier to release heat generated in the optical fiber, the ferrule, and the protective member to the outside via the cooling member.
  • the intermediate portion of the optical fiber may be in contact with an inner surface of the fiber insertion hole of the shielding portion of the protective member.
  • an air layer may be formed between the intermediate portion of the optical fiber and an inner surface of the fiber insertion hole of the shielding portion of the protective member.
  • a laser module capable of suppressing heat generation due to laser light not coupled to an optical fiber
  • the laser module comprising: a laser element capable of emitting laser light, a fiber holding structure according to any one of configurations 1 to 7, and a lens that couples the laser light emitted from the laser element to the front end of the optical fiber of the fiber holding structure.
  • the present invention is suitable for use in a fiber holding structure that holds an optical fiber to which laser light emitted from a laser element is coupled.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Optical Couplings Of Light Guides (AREA)
PCT/JP2023/029219 2022-11-02 2023-08-10 ファイバ保持構造及びレーザモジュール Ceased WO2024095556A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202380074595.2A CN120092196A (zh) 2022-11-02 2023-08-10 光纤保持结构及激光模块
EP23885328.7A EP4614202A1 (en) 2022-11-02 2023-08-10 Fiber retention structure and laser module
JP2024554265A JP7818716B2 (ja) 2022-11-02 2023-08-10 ファイバ保持構造及びレーザモジュール

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022176000 2022-11-02
JP2022-176000 2022-11-02

Publications (1)

Publication Number Publication Date
WO2024095556A1 true WO2024095556A1 (ja) 2024-05-10

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PCT/JP2023/029219 Ceased WO2024095556A1 (ja) 2022-11-02 2023-08-10 ファイバ保持構造及びレーザモジュール

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EP (1) EP4614202A1 (https=)
JP (1) JP7818716B2 (https=)
CN (1) CN120092196A (https=)
WO (1) WO2024095556A1 (https=)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003107294A (ja) * 2001-09-27 2003-04-09 Mitsubishi Cable Ind Ltd レーザ用光コネクタ及びレーザガイド
JP2006184337A (ja) * 2004-12-24 2006-07-13 Kyocera Corp 光ファイバ固定具及びそれを用いた光コネクタ
JP2007293298A (ja) * 2006-03-29 2007-11-08 Furukawa Electric Co Ltd:The 光学部品の光入出力端
WO2015037725A1 (ja) * 2013-09-12 2015-03-19 古河電気工業株式会社 半導体レーザモジュール
JP2015518185A (ja) * 2012-05-30 2015-06-25 アイピージー フォトニクス コーポレーション 高性能空間フィルタ
JP2016533543A (ja) * 2013-10-18 2016-10-27 オプトスカンド エービー オプトエレクトロニクス集成装置
JP2018155791A (ja) 2017-03-15 2018-10-04 株式会社フジクラ 光モジュール
US20200200363A1 (en) * 2018-12-21 2020-06-25 Soraa Laser Diode, Inc. Fiber-delivered laser-induced dynamic light system
JP2022176000A (ja) 2021-05-13 2022-11-25 ピーエス特機株式会社 ブラシレスモータ

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003107294A (ja) * 2001-09-27 2003-04-09 Mitsubishi Cable Ind Ltd レーザ用光コネクタ及びレーザガイド
JP2006184337A (ja) * 2004-12-24 2006-07-13 Kyocera Corp 光ファイバ固定具及びそれを用いた光コネクタ
JP2007293298A (ja) * 2006-03-29 2007-11-08 Furukawa Electric Co Ltd:The 光学部品の光入出力端
JP2015518185A (ja) * 2012-05-30 2015-06-25 アイピージー フォトニクス コーポレーション 高性能空間フィルタ
WO2015037725A1 (ja) * 2013-09-12 2015-03-19 古河電気工業株式会社 半導体レーザモジュール
JP2016533543A (ja) * 2013-10-18 2016-10-27 オプトスカンド エービー オプトエレクトロニクス集成装置
JP2018155791A (ja) 2017-03-15 2018-10-04 株式会社フジクラ 光モジュール
US20200200363A1 (en) * 2018-12-21 2020-06-25 Soraa Laser Diode, Inc. Fiber-delivered laser-induced dynamic light system
JP2022176000A (ja) 2021-05-13 2022-11-25 ピーエス特機株式会社 ブラシレスモータ

Also Published As

Publication number Publication date
JPWO2024095556A1 (https=) 2024-05-10
JP7818716B2 (ja) 2026-02-20
CN120092196A (zh) 2025-06-03
EP4614202A1 (en) 2025-09-10

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