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WO2020027253A1 - Coupleur optique - Google Patents

Coupleur optique Download PDF

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Publication number
WO2020027253A1
WO2020027253A1 PCT/JP2019/030156 JP2019030156W WO2020027253A1 WO 2020027253 A1 WO2020027253 A1 WO 2020027253A1 JP 2019030156 W JP2019030156 W JP 2019030156W WO 2020027253 A1 WO2020027253 A1 WO 2020027253A1
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WO
WIPO (PCT)
Prior art keywords
light
parallel light
optical
optical coupler
coupler according
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/JP2019/030156
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English (en)
Japanese (ja)
Inventor
基博 中原
和博 中原
克也 大友
昇平 小椋
正博 塩谷
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.)
Nakahara Opto-Electronics Laboratories Inc
Original Assignee
Nakahara Opto-Electronics Laboratories Inc
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 Nakahara Opto-Electronics Laboratories Inc filed Critical Nakahara Opto-Electronics Laboratories Inc
Priority to JP2020534734A priority Critical patent/JP7213499B2/ja
Publication of WO2020027253A1 publication Critical patent/WO2020027253A1/fr
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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • 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
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed 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
    • G02B6/42—Coupling light guides with opto-electronic elements

Definitions

  • the present disclosure relates to an optical coupler.
  • Non-Patent Document 1 In order to increase the output of a fiber laser, an optical coupler for coupling excitation light from a plurality of excitation light sources has been proposed (for example, see Non-Patent Document 1).
  • excitation light from a plurality of excitation light sources is input to an optical fiber, which is a laser medium, to cause laser oscillation.
  • an optical fiber which is a laser medium
  • Non-Patent Document 1 a plurality of fibers connected to the excitation light source are bundled and welded, and as shown in FIG. 1, integrated into a tapered portion 111 extending in a tapered shape. It was connected to the optical fiber 112 and used as excitation output light.
  • the tapered portion 111 is formed in the middle, the light on the output side always has an emission angle larger than the incident angle, and the NA (Numerical Aperture) is effectively increased. Therefore, a high-NA optical fiber having a larger NA than the input-side optical fiber must be used as the output-side optical fiber 112.
  • the inclination of the taper in the tapered portion 111 increases as the number of optical fibers connected to the tapered portion 111 increases.
  • increasing the length of the tapered portion 111 contradicts the demand for downsizing the device. For this reason, there is a problem that the inclination of the tapered portion 111 increases with an increase in the output of the fiber laser, and the NA on the output side further increases.
  • the present disclosure aims to realize an optical coupler capable of one-to-many or many-to-many optical branching / coupling without using an optical fiber having a particularly high NA.
  • an object of the present disclosure is to realize an optical coupler that can increase the number of pump light sources used for pump output light without using an optical fiber having a particularly high NA.
  • the optical coupler of the present disclosure includes: A plurality of light beams emitted from a plurality of optical fibers are incident from one end of a gradient index lens, and the plurality of light beams are emitted to one optical fiber connected to the other end of the gradient index lens.
  • Light section The light-condensing unit is disposed between the light-collecting unit and the plurality of optical fibers, converts the light from the plurality of optical fibers into parallel light using a refractive-index distributed lens, and provides a distributed-index lens provided in the light-collecting unit.
  • an optical coupler capable of one-to-many or many-to-many optical branching / coupling can be realized without using an optical fiber having a particularly high NA.
  • the number of pump light sources used for pump output light can be increased without using an optical fiber having a particularly high NA, so that the fiber laser can have a high output.
  • An example of an optical path when using a related technology shows an example of an optical coupler according to a first embodiment. 13 shows an example of a parameter of a light-collecting unit according to the present disclosure. 4 shows an example of an emission angle from a tapered portion. 4 illustrates an example of an optical path of light propagating in a light condensing unit according to the first embodiment. 5 shows a first example of the distribution of each propagating light on the emission end face of the light collecting section. 9 shows a second example of the distribution of each propagating light on the emission end face of the light collecting section. 9 shows a third example of the distribution of each propagation light on the emission end face of the light collecting unit. 5 shows a first example of an arrangement of parallel light generation units.
  • 9 shows a second example of the arrangement of the parallel light generation units.
  • 7 shows an example of an optical coupler according to a second embodiment.
  • 4 shows an example of the arrangement of a parallel light generation unit in a capillary.
  • 9 shows a modification of the optical coupler according to the second embodiment.
  • 13 shows an example of an optical coupler according to a third embodiment.
  • 13 shows an example of arrangement of parallel light generation units according to the third embodiment.
  • 5 shows an example of the distribution of each propagation light on the emission end face of the light collecting section.
  • 13 shows a first example of an optical coupler according to a fourth embodiment.
  • 14 shows an example of an optical path of propagating light in a first example of the optical coupler according to the fourth embodiment.
  • 13 shows a first arrangement example of a parallel light generation unit in a capillary according to a fourth embodiment.
  • 13 shows a second arrangement example of the parallel light generation unit in the capillary according to the fourth embodiment.
  • 13 shows a second example of the optical coupler according to the fourth embodiment.
  • 14 shows an example of an optical path of propagating light in a second example of the optical coupler according to the fourth embodiment.
  • 13 shows an example of an optical coupler according to a fifth embodiment.
  • 13 shows an example of an optical coupler according to a sixth embodiment.
  • 5 shows an example of the distribution of each propagation light on the emission end face of the light collecting section.
  • 13 shows an example of an optical coupler according to a seventh embodiment.
  • FIG. 2 shows an example of the optical coupler according to the present embodiment.
  • the optical coupler according to the present embodiment includes a light collector 11 and a parallel light generator 13.
  • the parallel light generating unit 13 is connected to an end face 11A arranged at one end of the light collecting unit 11, and the optical fiber 12 is connected to an end face 11B arranged at the other end of the light collecting unit 11.
  • the parallel light generation unit 13 is connected to a position at a predetermined distance from the optical axis of the gradient index lens provided in the light collection unit 11.
  • the optical fiber 12 is connected to the optical axis of a gradient index lens provided in the condensing section 11.
  • the optical fiber 14 is connected to the optical axis of a gradient index lens provided in the parallel light generator 13.
  • Each optical fiber 14 is connected to an excitation light source 15. These connections may use an adhesive or a fusion connection.
  • Each excitation light source 15 generates excitation light used for laser oscillation. Excitation light from each excitation light source 15 propagates through the optical fiber 14 and enters the parallel light generation unit 13.
  • the parallel light generator 13 converts the light from the optical fiber 14 into parallel light using a gradient index lens.
  • the condensing unit 11 condenses the parallel light from the parallel light generating unit 13 on the optical fiber 12 using a gradient index lens. Accordingly, the present disclosure can extract a plurality of pump lights from the optical fiber 12 as pump output light.
  • the central refractive index of the light collecting unit 11 is set to n 0
  • the refractive index distribution coefficient of the light collecting unit 11 is set to g
  • the lens length of the light collecting unit 11 is set to z
  • the distance of the incident light from the optical axis OA 11 is r 0
  • the incident angle of the incident light PL 13 on the end face 11 A of the light condensing section 11 is ⁇ 0
  • the parallel light generation units 13 are arranged in degrees.
  • the emission angle theta 1 becomes 13.5 °.
  • the exit angle from the end face 111B when the taper according to the related art is used is such that the gradient index lens according to the present disclosure is used even if the number of reflections in the taper portion 111 is two. It is larger than the condensing part 11. Further, when a large number of excitation light sources are mounted, the area of the end face 111A increases, and the number of reflections at the tapered portion 111 further increases, so that the emission angle from the end face 111B sharply increases. For this reason, when mounting a large number of excitation light sources, the NA of the optical fiber connected to the end face 111B becomes so large that it cannot be used practically.
  • the exit angle from the condensing unit 11 is smaller than the exit angle when a taper is used, and the optical fiber 12 has a particularly high NA.
  • the NA of the optical fiber 12 according to the present disclosure can be the same as that of the light collecting unit 11.
  • the NA of the optical fiber 12 in the present disclosure may be higher than that of the light collecting unit 11.
  • the optical fibers 12 and 14 can transmit high-output light.
  • a multimode optical fiber it is preferable to use a multimode optical fiber.
  • the core diameter of the optical fibers 12 and 14 is arbitrary, a large-diameter optical fiber such as 50 ⁇ m, 62.5 ⁇ m, or 100 ⁇ m, which can transmit a large amount of light energy at a time, is used.
  • the core diameter of the optical fibers 14 may be common, the present disclosure is not limited to this as described later with reference to FIG.
  • the optical fiber 12 may be any optical fiber used for an optical fiber amplifier such as a double clad fiber.
  • the pumping light can be directly incident on the amplification optical fiber 12 and laser oscillation can be performed using a reflection film or FBG (Fiber Bragg Grating) inserted into the optical fiber 12.
  • FBG Fiber Bragg Grating
  • the refractive index distribution type lens used for the light collecting unit 11 and the parallel light generating unit 13 is a lens in which the refractive index is distributed in a parabolic manner from the central axis toward the outer periphery, and Ge, Ti, Zr, Examples thereof include those to which a refractive index distribution having a square distribution is formed by ion diffusion in a multi-component glass.
  • a GI (graded index) fiber can be used as the parallel light generating unit 13.
  • Lens length L 13 of the gradient index lens included in the collimated light generation unit 13 is the length that converts light from the optical fiber 14 into parallel light.
  • a length is, for example, 1 / pitch or a length obtained by adding an integral multiple of ⁇ ⁇ ⁇ pitch to this.
  • the lens length L 11 of the gradient index lens provided in the light condensing part 11 is a length for condensing the parallel light from each parallel light generating part 13 on the optical fiber 12.
  • a length is, for example, 1 / pitch or a length obtained by adding an integral multiple of 1 / pitch thereto.
  • FIG. 5 shows an example of the optical path of the propagation lights PL 11 # 1 and PL 11 # 3 in the light collecting section 11.
  • Parallel light PL 13 # 1 in the position from the optical axis OA 11 distance r 13 # 1 of the end face 11A of the condensing unit 11 is incident, the distance from the optical axis OA 11 of the end face 11A of the condensing unit 11 r
  • the parallel light PL 13 # 3 is incident on the position of 13 # 3 .
  • These PL 11 # 1 and PL 11 # 3 converge on the optical axis OA 11 at a focal plane of 1/4 pitch from the end face 11A.
  • the propagation light PL 11 # 1 ⁇ PL 11 # 4 is emitted from the vicinity of the optical axis OA 11 at the end face 11B.
  • each of the propagation lights PL 11 # 1 to PL 11 # 4 of the light condensing section 11 is emitted from the vicinity of the optical axis OA 11 on the end face 11B.
  • the peak intensity becomes high, so that dielectric breakdown may occur.
  • a flat-top light intensity distribution may be desirable.
  • the lens length L 11 of the gradient index lens included in the condenser unit 11 is preferably a lens length of around 1/4 pitch except 1/4 pitch.
  • the lens length L 11 of the gradient index lens included in the condensing section 11 is preferably slightly shorter than 1/4 pitch.
  • the light intensity of each of the propagation lights PL 11 # 1 to PL 11 # 4 is dispersed within the range of the mode field diameter MFD 12 of the optical fiber 12.
  • the lens length L 11 of the gradient index lens included in the condensing section 11 may be slightly longer than the 1/4 pitch. As a result, as shown in FIG. 8, the light intensity of each of the propagation lights PL 11 # 1 to PL 11 # 4 is dispersed within the range of the mode field diameter MFD 12 of the optical fiber 12.
  • the distance r 13 # equal 1 and r 13 # 13, parallel light PL 13 when the # 1 and PL 13 # 3 is symmetric with respect to the optical axis OA 11, propagating light at the end face 11B
  • the reflected light of PL 11 # 1 is incident on propagating light PL 11 # 13 .
  • this reflected light is generated.
  • the collimated light generation unit 13 # 3 is different from the parallel light generating unit 13 # 1 and the point symmetrical position P 11 # 1S respect to the optical axis OA 11, the collimated light generation unit 13 from the optical axis OA 11 # 1 And equidistant.
  • Collimated light generating unit 13 # 4 are different from the parallel light generating unit 13 # 2 and the point symmetrical position P 11 # 2S with respect to the optical axis OA 11, the collimated light generation unit from the optical axis OA 11 13 # 2 and equal It is located at a distance.
  • the number of parallel light generation units 13 arranged on concentric circles may be an odd number such as five as shown in FIG.
  • the parallel light generation units 13 may be arranged on a plurality of concentric circles.
  • FIG. 2 shows an example in which the optical fiber 14 and the pumping light source 15 are connected to all of the parallel light generators 13 # 1 to 13 # 4, but the present disclosure is not limited to this.
  • the optical fiber 14 may be connected to at least one of the parallel light generators 13 # 1 to 13 # 4.
  • FIG. 11 shows an example of the optical coupler according to the present embodiment.
  • the optical coupler according to the present embodiment uses a capillary-type optical component in which the circumferential direction of each parallel light generation unit 13 is covered with a capillary 31.
  • FIG. 12 shows an example of the arrangement of the parallel light generator 13 in the capillary 31.
  • the capillary 31 is provided with a through-hole, and the parallel light generation unit 13 is arranged in the through-hole.
  • the end surface position z 31B on the other end side of the capillary 31, the end surface position z 13B on the other end side of the parallel light generation unit 13, and the end surface position z 11A on one end side of the light condensing unit 11 match.
  • the parallel light generation unit 13 is fixed by the capillary 31, the parallel light generation unit 13 and the capillary-type optical component including the capillary 31 are connected to the light collection unit 11, so that the parallel light generation unit 13 # 1 to # 13 can be connected to the light collector 11 at desired positions.
  • FIG. 13 shows a modification of the present embodiment.
  • a capillary type optical component in which the circumferential direction of the optical fiber 14 shown in FIGS. 11 and 12 is covered with a capillary 41 is used.
  • a capillary-type optical component in which the circumferential direction of the optical fiber 14 is covered with the capillary 41 it is possible to easily connect the optical fiber 14 to the parallel light generators 13 # 1 to 13 # 4.
  • the method of manufacturing a capillary-type optical component including the parallel light generating unit 13 and the capillary 31 is arbitrary.
  • a through-hole equal to the number of the parallel light generating portions 13 is provided in a glass rod serving as a base material of the capillary 31, and a refractive index distribution type lens is inserted into each through-hole, and is melt-drawn. Then, polished and cut to length becomes lens length L 13.
  • a capillary-type optical component including the parallel light generation unit 13 and the capillary 31 can be manufactured.
  • FIG. 14 shows an example of the optical coupler according to the present embodiment. 5, the parallel light PL 13 when the beam diameter of the # 1 into parallel light PL 13 # 3 are different, 1/4 pitch shifting the lens length L 11 of the gradient index lens included in the condensing unit 11 from the focal plane If it is shorter or longer than the above, a difference occurs between the beam widths of the propagation lights PL 11 # 1 and PL 11 # 3 . Therefore, the optical coupler according to the present embodiment is different from the optical coupler according to the second embodiment in the lens diameter of the parallel light generation unit 13.
  • the lens length L 13 and refractive index distribution coefficient of the parallel light generating section 13 is arbitrary.
  • the parallel light generator 13 has a refractive index distribution coefficients as either parallel light generator 13 the refractive index distribution type lenses lens length L 13 are the same.
  • FIG. 15 shows an example of an arrangement of the parallel light generation unit 13 on the end face 11A.
  • the parallel light generators 13 # 1, 13 # 2, and 13 # 3 have a common first diameter
  • the parallel light generators 13 # 4, 13 # 5, and 13 # 6 have a larger diameter than the first diameter. It has a small common second diameter.
  • the core diameter of the optical fiber 14 connected to the parallel light generators 13 # 1, 13 # 2, 13 # 3 is the same as the optical fiber 14 connected to the parallel light generators 13 # 4, 13 # 5, 13 # 6. May be larger than the core diameter.
  • the parallel light generators 13 # 1, 13 # 2, and 13 # 3 have a larger lens diameter than the parallel light generators 13 # 4, 13 # 5, and 13 # 6, the parallel light beams incident on the condenser 11
  • the width of the parallel light generators 13 # 1, 13 # 2, 13 # 3 is larger than the width of the parallel light generators 13 # 4, 13 # 5, 13 # 6.
  • the distribution of the propagation light PL 11 # 1 ⁇ PL 11 # 6 at the end face 11B An example is shown below.
  • PL 11 # 4 to PL 11 # 6 with low beam intensity are arranged in the gap between PL 11 # 1 to PL 11 # 3 with high beam intensity.
  • the parallel light generating units 13 having different lens diameters to the end face 11A, the light intensity distribution on the end face 11B can be made closer to a flat top.
  • the present disclosure also includes a configuration in which the capillary 31 is not provided and the parallel light generation unit 13 is directly connected to the end surface 11A of the light collection unit 11, as illustrated in FIG. Note that the distribution as shown in FIG. 16 may be obtained by providing a difference in the intensity of the parallel light emitted from the parallel light generation unit 13.
  • FIG. 17 shows an example of the optical coupler according to the present embodiment.
  • FIG. 17 When shifting the parallel light PL 13 # 1 of incident angle theta 13 # 1 and the parallel light PL 13 # incident angle theta 13 # 3 of 3 from 0 degrees at 5, as shown in FIG. 18, the propagating light PL 11 # 1 And PL 11 # 3 does not converge on the optical axis OA 11 at the focal plane.
  • the incident angle of at least one parallel light is shifted from 0 degree in the second embodiment.
  • the lens length L 13 and refractive index distribution coefficient of the parallel light generating section 13 is arbitrary.
  • the parallel light generator 13 has a refractive index distribution coefficients as either parallel light generator 13 the refractive index distribution type lenses lens length L 13 are the same.
  • FIG. 19 shows an example of the arrangement of the parallel light generator 13 in the capillary 31.
  • the capillary 31 is provided with a through-hole, and the parallel light generation unit 13 is arranged in the through-hole.
  • the end face 11A of the condensing part 11 and the end face 31B of the capillary 31 on the condensing part 11 side are joined, and the normal of the end face 31B of the capillary 31 on the condensing part 11 side and the optical axis OA of the parallel light generating part 13 angle theta 13 and 13 is equal to the incident angle theta 13 # 1 and theta 13 # 3 parallel light PL 13 # 1 and PL 13 # 3 shown in FIG. 19. That is, the optical axis OA13 of the parallel light generation unit 13 has an inclination with respect to the normal to the end surface 11A of the light collection unit 11.
  • Lens length L 13 of the on the optical axis OA 13 parallel light generator 13 is 1/4 the pitch. Both ends of the parallel light generating section 13 are perpendicular to the optical axis OA13. For this reason, the parallel light generator 13 in which the optical fiber 14 is connected to the optical axis OA 13 of the one end 13A is arranged in the through hole of the capillary 31 and is fixed with a refractive index matching agent to convert the parallel light into the incident angle ⁇ 13. The light can be incident on the light condensing unit 11.
  • the position z 13B of the optical axis OA 13 of the end surface 13B of the collimated light generation unit 13 is disposed on the optical fiber 14 side of a position z 31B of the end surface 31B of the capillary 31.
  • the position z 13A of the optical axis OA 13 at the end face 13A of the collimated light generation unit 13 is disposed on the optical fiber 14 side of a position z 31A of the end surface 31A of the capillary 31. This facilitates setting of the angle of the parallel light generator 13 with respect to the capillary 31.
  • FIG. 20 shows a second arrangement example of the parallel light generation unit 13 in the capillary 31.
  • both ends of the parallel light generator 13 are arranged on the same plane as both ends of the capillary 31.
  • the lens length L 13 of the on the optical axis OA 13 parallel light generator 13 is 1/4 the pitch.
  • a through hole is provided in the base material of the capillary 31, the base material of the parallel light generation unit 13 is disposed in the through hole, and the melt drawing is performed so as to have a lens diameter of the parallel light generation unit 13.
  • lens length L 13 of the on the optical axis OA 13 of the light generator 13 it is possible to produce by grinding to separate so that a desired length. For this reason, the incorporation of the parallel light generating unit 13 into the capillary 31 can be omitted, and the manufacture is easy.
  • the parallel lights PL 13 # 1 and PL 13 # 3 are located on the optical axis OA 11 such that the propagation lights PL 11 # 1 and PL 11 # 3 cross the optical axis OA 11 before reaching the focal plane.
  • the incident angles ⁇ 13 # 1 and ⁇ 13 # 3 are incident toward the present invention, the present disclosure is not limited thereto.
  • the propagation light PL 11 # 1 and PL 11 # 3 cross the optical axis OA 11 after reaching the focal plane, and are directed away from the optical axis OA 11.
  • the incident angles ⁇ 13 # 1 and ⁇ 13 # 3 may be incident.
  • the present embodiment also shows an example in which the circumferential direction of the parallel light generating unit 13 is covered with the capillary 31, the present disclosure is not limited to this.
  • the present disclosure also includes a configuration in which the capillary 31 is not provided and the parallel light generation unit 13 is directly connected to the end surface 11A of the light collection unit 11, as illustrated in FIG.
  • FIG. 23 shows an example of the optical coupler according to the present embodiment.
  • the capillary 31 shown in FIG. 17 has a tapered shape.
  • the arrangement of the parallel light generation unit 13 in the capillary 31 is preferably configured as shown in FIG. This makes it possible to employ the following manufacturing method in which the incorporation of the parallel light generating unit 13 into the capillary 31 can be omitted.
  • a through hole is provided in the base material of the capillary 31, the base material of the parallel light generation unit 13 is arranged in the through hole, and melt drawing is performed so that the lens diameter of the parallel light generation unit 13 becomes equal to a desired incident angle.
  • melt drawing is performed so that the lens diameter of the parallel light generation unit 13 becomes equal to a desired incident angle.
  • a double clad fiber having two clad layers is used as an optical fiber for a high-power fiber laser.
  • a double clad fiber is used as one optical fiber 12 connected to the other end 11B of the light collecting unit 11.
  • FIG. 24 shows an example of the optical coupler according to the present embodiment.
  • the inner clad CL 12 covers the periphery of the core CR 12
  • the outer clad covers the periphery of the inner clad CL 12 .
  • the double clad fiber amplifies the propagation light of the core CR 12 by propagating the pump light in the inner clad CL 12 and enables laser oscillation.
  • the optical fiber 12 When the optical fiber 12 is used as an optical fiber for laser oscillation, a 100% reflection film for laser oscillation is provided on the end face 12A of the optical fiber 12. Therefore, when the excitation light from the excitation light source 15 is incident on the core CR 12 , the excitation light is reflected by the 100% reflective film provided on the end face 12 ⁇ / b> A of the optical fiber 12, and the excitation light is not propagated into the core CR 12 , The light is reflected by the light source 15 and causes a failure of the excitation light source 15. Therefore, when connecting a double-clad fiber laser oscillator as the optical fiber 12, as shown in FIG.
  • the present disclosure by using the lens length L 11 of the gradient index lens provided in the light collecting unit 11, the incident angle of parallel light from the parallel light generating unit 13 to the light collecting unit 11, or a combination thereof, The excitation light from the light generation unit 13 can be selectively made incident on the inner clad CL 12 of the optical fiber 12. For this reason, the present disclosure makes it possible to efficiently use the excitation light from the excitation light source 15 by efficiently causing the excitation light from the excitation light source 15 to enter the inner clad CL 12 of the optical fiber 12, and to further use the fiber laser. And high reliability can be realized.
  • FIG. 26 shows an example of the optical coupler according to the present embodiment.
  • a multi-core fiber is connected as the optical fiber 12 to the other end 11 ⁇ / b> B of the light collector 11. Accordingly, in the present disclosure, by using a multi-core fiber as the optical fiber 12, the propagation light of the plurality of optical fibers 14 is fan-in to the optical fiber 12, which is a multi-core fiber, and the propagation light of each core 42 provided in the optical fiber 12 is transmitted. Can be fanned out to a plurality of optical fibers 14.
  • the optical fiber 12 includes cores CO 12 # 1 , CO 12 # 2 , CO 12 # 3 , and CO 12 # 4 .
  • each of the propagating lights PL 11 # 1 , PL 11 # 2 , PL 11 # 3 , and PL 11 # 4 incident from the end face 11A of the light condensing section 11 has a separate core at the other end 11B. The light is incident on CO 12 # 1 to CO 12 # 4 .
  • the lens length L 11 of the gradient index lens provided in the light collecting unit 11 the incident angle of parallel light from the parallel light generating unit 13 to the light collecting unit 11, or a combination thereof.
  • the propagation lights PL 11 # 1 , PL 11 # 2 , PL 11 # 3 , and PL 11 # 4 from the light generation unit 13 can be made incident on the individual cores CO 12 # 1 to CO 12 # 4 .
  • the lens length L 11 of the gradient index lens provided in the condensing portion 11 is preferably 1/4 pitch, or a length obtained by adding an integer multiple of a half pitch to it.
  • the incident position and the incident direction of each light on the end surface 11A of the condensing unit 11 are set such that the propagation lights PL 11 # 1 to PL 11 # 4 are incident on the individual cores CO 12 # 1 to CO 12 # 4. Is done.
  • the propagating lights do not intersect inside the condensing unit 11. Thereby, crosstalk of each propagating light inside the condensing unit 11 can be prevented. Therefore, like the incident angles ⁇ 13 # 1 and ⁇ 13 # 3 shown in FIG. 26, the incident direction of each light incident from the end face 11A of the light condensing unit 11 is set to a direction away from the optical axis OA 11. Is preferred.
  • each light incident from the end face 11 ⁇ / b> A of the light condensing unit 11 may be set in parallel with the optical axis OA 11 .
  • the propagation mode of each core provided in the optical fiber 12 may be a single mode or a multimode.
  • the present disclosure can be applied to the laser processing industry and the information and communication industry.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

Le but de la présente invention est d'obtenir un coupleur optique apte à effectuer un branchement/couplage optique point à multipoint ou multipoint à multipoint sans l'utilisation d'une fibre optique ayant un NA particulièrement élevé. La présente invention concerne un coupleur optique comprenant : une partie condensation (11) qui reçoit une pluralité de rayons émis par l'intermédiaire d'une pluralité de fibres optiques (14) à une extrémité (11A) d'une lentille à gradient d'indice et permet à la pluralité de rayons d'entrer dans une seule fibre optique (12) connectée à l'autre extrémité (11B) de la lentille à gradient d'indice ; et des collimateurs (13) agencés entre la partie condensation (11) et la pluralité de fibres optiques (12) et servant à former les rayons provenant de la pluralité de fibres optiques (12) en des rayons parallèles à l'aide d'une lentille à gradient d'indice et à faire entrer les rayons parallèles à ladite extrémité (11A) de la partie condensation (11).
PCT/JP2019/030156 2018-08-02 2019-08-01 Coupleur optique Ceased WO2020027253A1 (fr)

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JP2020534734A JP7213499B2 (ja) 2018-08-02 2019-08-01 光結合器

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JP2018145833 2018-08-02
JP2018-145833 2018-08-02

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