WO2024084561A1 - Procédé de conception de système de transmission optique et dispositif de conception - Google Patents

Procédé de conception de système de transmission optique et dispositif de conception Download PDF

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Publication number
WO2024084561A1
WO2024084561A1 PCT/JP2022/038672 JP2022038672W WO2024084561A1 WO 2024084561 A1 WO2024084561 A1 WO 2024084561A1 JP 2022038672 W JP2022038672 W JP 2022038672W WO 2024084561 A1 WO2024084561 A1 WO 2024084561A1
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WIPO (PCT)
Prior art keywords
light
optical fiber
irradiation
optical
parameters
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PCT/JP2022/038672
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English (en)
Japanese (ja)
Inventor
誉人 桐原
聖 成川
勝久 田口
亜弥子 岩城
和秀 中島
隆 松井
千里 深井
悠途 寒河江
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日本電信電話株式会社
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Priority to PCT/JP2022/038672 priority Critical patent/WO2024084561A1/fr
Publication of WO2024084561A1 publication Critical patent/WO2024084561A1/fr

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    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • 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

Definitions

  • This disclosure relates to a method and device for designing an optical transmission system that includes bundled optical fibers as optical transmission paths.
  • Non-Patent Document 1 Mobile sterilization robot
  • the product of Non-Patent Document 1 is an autonomous mobile robot that irradiates ultraviolet light.
  • the robot can irradiate ultraviolet light while moving around a room in a building such as a hospital room, thereby automatically sterilizing a wide area without human intervention.
  • Non-Patent Document 2 Freestanding Air Purifier
  • the product in Non-Patent Document 2 is a device that is installed on the ceiling or a predetermined location in a room and circulates the air in the room while sterilizing, etc.
  • Non-Patent Document 3 is a portable device equipped with an ultraviolet light source. A user can take the device to a desired area and irradiate ultraviolet light. Therefore, the device can be used in various places.
  • Non-Patent Document 1 irradiates high-power ultraviolet light, so the device is large-scale and expensive. Therefore, the product of Non-Patent Document 1 has a problem that it is difficult to realize an economical system.
  • the product of Non-Patent Document 2 sterilizes the circulated indoor air, and therefore cannot irradiate the location where sterilization is desired with ultraviolet light directly.
  • Non-Patent Document 3 cannot irradiate ultraviolet light onto, for example, narrow pipes or areas where people cannot enter.
  • the products described in non-patent documents have a problem in that they lack versatility in terms of being able to irradiate ultraviolet light at any location.
  • (3) Operability The product of Non-Patent Document 3 is portable and can irradiate ultraviolet light in various locations. However, in order to obtain sufficient sterilization effects at the target location, the user is required to have skills and knowledge, and there are problems with operability.
  • an ultraviolet light irradiation system 300 using optical fibers as shown in FIG. 1 can be considered.
  • ultraviolet light is transmitted from the ultraviolet light source unit 11a using a thin and easily bendable optical fiber, and the ultraviolet light output from the tip of the optical fiber 14 is irradiated to the irradiation target area AR where pinpoint sterilization is desired. Since ultraviolet light can be irradiated to any location simply by moving the irradiation unit 13 at the tip of the optical fiber 14, the versatility of the above issue (2) can be resolved. In addition, since there is no need to move or set up the ultraviolet light source, and no skill or knowledge is required of the user, the operability of the above issue (3) can also be resolved.
  • an optical distribution unit 12 such as an optical splitter in the optical transmission path 16 and configuring a system of P-MP (Point to Multipoint) such as FTTH (Fiber To The Home), multiple locations can be sterilized by sharing a single light source. Therefore, the economics of the above issue (1) can also be resolved.
  • P-MP Point to Multipoint
  • FTTH Fiber To The Home
  • Coupled efficiency means the ratio of the power input to the optical fiber (optically coupled to the optical fiber core) to the output power of the light source.
  • Figure 2(A) Since the light-emitting surface of an LED is larger than that of a laser, even if one tries to couple the light output from the LED to a single-core optical fiber, the core area in the cross section is narrow, and most of the light is not coupled, resulting in low coupling efficiency ( Figure 2(A)).
  • FIG. 3A is a diagram for explaining how the light L1 from the light source unit 11 is irradiated onto one end of the bundle optical fiber 36, how the bundle optical fiber 36 is separated into each single-core optical fiber 51a at the other end to become the path 14, and how the light propagating therethrough is emitted (the irradiation target area ARn is located at the end of the emitted light).
  • the bundle optical fiber 36 is a bundle of multiple single-core optical fibers 51a.
  • the light L1 from the light source unit 11 is irradiated onto one end (the coupling portion) of the bundle optical fiber 36, but the illuminance is not uniform on the irradiation surface (light spot) (there is a power deviation). Specifically, the illuminance is high near the center of the light spot, and low around the light spot. 3A, when the size of one end of the bundle optical fiber 36 is larger than the size 51a of the light spot, the light spot may only partially hit the core of the single-core optical fiber 51a on the periphery of the bundle optical fiber 36.
  • the present invention aims to provide a design method for calculating the parameters of an optical transmission system that satisfies the requirements for an optical transmission system that uses a light source such as an LED and a bundled optical fiber as an optical transmission path.
  • the design method of the present invention uses the parameters of the optical transmission system to calculate the optical power output by each irradiation unit, and adjusts the parameters so that the time integral of the optical power becomes the energy required by each irradiation target area.
  • the design method according to the present invention includes the steps of: A light source that outputs light; a bundle optical fiber in which a plurality of optical fibers are bundled and which transmits the light; A plurality of irradiation units each irradiating an irradiation target area with the light; the optical fiber separated from the bundle optical fiber, the optical fiber having a plurality of paths for propagating the light to each of the irradiation units;
  • a method for designing an optical transmission system having The present invention is characterized in that the parameters are adjusted so that the power of the light output by each of the irradiation units, which is calculated using parameters of the optical transmission system, becomes a value that takes into account the energy required for each of the irradiation target areas.
  • the design device comprises: A light source that outputs light; a bundle optical fiber in which a plurality of optical fibers are bundled and which transmits the light; A plurality of irradiation units each irradiating an irradiation target area with the light; the optical fiber separated from the bundle optical fiber, the optical fiber having a plurality of paths for propagating the light to each of the irradiation units;
  • a design apparatus for designing an optical transmission system having The present invention is characterized in that the parameters are adjusted so that the power of the light output by each of the irradiation units, which is calculated using parameters of the optical transmission system, becomes a value that takes into account the energy required for each of the irradiation target areas.
  • the parameters are: The power P in of the light output by the light source, the number I of the optical fibers bundled into the optical fiber bundle; a coupling efficiency C i of the light coupled to each of the optical fibers bundled in the optical fiber bundle (i is an identifier for identifying the optical fiber); The number n of the irradiation units, The distance L n of the optical path from one end of the bundle optical fiber to which the light is coupled through the path to the irradiation unit, and
  • E n required for each of the irradiation target areas is E n
  • the irradiation time T n for each of the irradiation target areas is T n
  • the propagation loss per unit length in the optical path is C Loss , [Formula (1)]
  • E n P in ⁇ C i ⁇ L n ⁇ C Loss ⁇ T n
  • the parameter is adjusted so that
  • the specific design policy for making the adjustments is as follows: (1) The power of the light output from each of the irradiation units P in ⁇ C i ⁇ L n ⁇ C Loss and adjusting said parameters so that (2) Adjusting the parameters so that the irradiation time T n in equation (1) is minimized in any one of the irradiation target areas N. (3) Adjusting the parameters so that the sum of the irradiation times T n in equation (1) for all of the irradiation target areas N is minimized.
  • the present invention can provide a design method for calculating the parameters of an optical transmission system that satisfies the requirements for an optical transmission system that uses a light source such as an LED and a bundled optical fiber as an optical transmission path.
  • FIG. 1 is a diagram illustrating a problem to be solved by the present invention.
  • FIG. 1 is a diagram illustrating a problem to be solved by the present invention.
  • FIG. 1 is a diagram illustrating a problem to be solved by the present invention.
  • FIG. 1 is a diagram illustrating a design apparatus according to the present invention.
  • 1 is a flowchart illustrating a design method according to the present invention.
  • 1A to 1C are diagrams illustrating the effects of an optical transmission system designed by a design method according to the present invention.
  • FIG. 4 is a diagram illustrating a design device 200 for designing an optical transmission system 301 according to the present embodiment.
  • the optical transmission system 301 includes: A light source unit 11 that outputs light L1; a bundle optical fiber 36 in which a plurality of optical fibers are bundled and which transmits the light; A plurality of irradiation units 13 each irradiating a light beam L2 onto an irradiation target area; a plurality of single-core optical fibers 51 a which are optical fibers separated from the bundle optical fiber 36 and which propagate light to each of the irradiation units 13; has.
  • the light source unit 11 is, for example, an LED, and outputs light L1.
  • the light L1 is ultraviolet light, visible light, infrared light, or modulated light obtained by modulating any of these lights.
  • the bundle optical fiber 36 is an optical transmission path in which a plurality of single-core optical fibers 51a are bundled together as described in Fig. 3A.
  • the light L1 outputted from the light source unit 11 is inputted to one end T1 of the bundle optical fiber 36.
  • Each optical fiber 51a included in the bundle optical fiber 36 propagates the inputted light L1 to a separation unit T2 at the other end.
  • the separation section T2 is a section for separating each of the single-core optical fibers 51a bundled in the bundle optical fiber 36.
  • each of the single-core optical fibers 51a is separated at the separation section T2 and becomes a route 14 to each irradiation target area.
  • An irradiation unit 13 is disposed at the tip of each of the separated paths 14.
  • the light L1 propagated to the irradiation unit 13 is irradiated from each irradiation unit 13 to an irradiation target area (shown as irradiated light L2 in FIG. 4).
  • the design device 200 is a device that calculates the parameters of the optical transmission system 301 according to this design policy. In other words, the design device 200 adjusts the parameters so that the power of the light L2 output by each irradiation unit 13, calculated using the parameters of the optical transmission system 301, becomes a value that takes into account the energy required for each irradiation target area (for example, the ultraviolet light energy required for inactivation).
  • the parameters are: The power P in of the light L1 output from the light source unit 11, The number I of optical fibers 51a bundled into the optical fiber bundle 36; Coupling efficiency C i of the light L1 coupled to each of the optical fibers 51 a bundled in the optical fiber bundle 36 (i is an identifier for identifying the optical fiber 51 a); the number n of irradiation units 13 (n is an integer from 1 to N); and the distance L n of the optical path from one end T 1 of the bundle optical fiber 36 to which the light L 1 is coupled, through the paths 14 , to each of the irradiation units 13 .
  • FIG. 5 is a flowchart illustrating a design method performed by the design device 200.
  • E n the energy required for each irradiation target area ARn
  • T n the irradiation time for each irradiation target area ARn
  • C Loss the propagation loss per unit length in the optical path
  • This design method is for an optical transmission system 301 having a light source unit 11 which is an LED, an optical fiber bundle 36, a path 14 after the bundle is separated, and an irradiation unit 13, and includes the following processes.
  • Step S01 A design policy is established (performed by the designer).
  • the design policy may be, for example, a policy to make the intensity of light propagating through the optical fibers 51a included in the bundle optical fiber 36 uniform, to have a certain degree of deviation (the intensity of light propagating through the optical fibers 51a on the periphery is smaller than the intensity of light propagating through the optical fibers 51a near the center), or to propagate light through some of the optical fibers 51a.
  • Step S02 The following parameters are set.
  • the output power (P in ) of the light source unit 11 is set.
  • the number of cores (the number of optical fibers 51a) I of the bundle optical fiber 36 is set.
  • the coupling efficiency (C i ) of the light L1 to each optical fiber 51 a at one end T1 of the bundle optical fiber 36 is acquired.
  • “i” is an identifier for identifying each optical fiber 51 a at one end T1.
  • the identifier i can be expressed by the coordinates or location r l,m (l: number of layers, m: address) of the core.
  • the coupling efficiency (C i ) can be adjusted, for example, by the core diameter and numerical aperture of the optical fiber 51 a.
  • the coupling efficiency (C i ) can also be adjusted by the spot diameter and illuminance distribution of the light L1 from the light source unit 11.
  • the total number (N) of irradiation target areas ARn is set.
  • the distances (L n ) to the irradiation unit 13 of the bundle optical fiber 36 and the paths 14 after the separation unit T2 are set.
  • C Loss 0.3 may be used.
  • the energy E n is, for example, an estimated cumulative energy value required for inactivating the irradiation target area, and is set taking into account the area of the irradiation target area and the irradiation time T n .
  • Step S03 Perform numerical calculations using equation (1).
  • Step S04 It is confirmed whether the calculation result is in accordance with the design guidelines. Specifically, it is whether the desired energy E n is irradiated to the irradiation target area. Note that the energy irradiated to the irradiation target area does not necessarily have to be equal to the energy E n , and may be an energy that is close to the energy E n . The degree of approximation is determined according to the design guidelines. If the calculation result does not comply with the design policy ("No" in step S04), the parameters are changed and the process is repeated from step S02. On the other hand, if the calculation result complies with the design policy ("Yes" in step S04), step S05 is carried out.
  • Step S05 Determine each parameter, assign a single path 14 to each irradiation unit 13, and complete the optical transmission system 301.
  • E n P outn ⁇ T n
  • E n P in ⁇ C i ⁇ L n ⁇ C Loss It can be expressed as:
  • the calculation is performed taking into consideration the weighting of the power deviation according to the state of the bundle optical fiber 36, the path 14, and the irradiation target area AR that each irradiation unit 13 is responsible for.
  • step S03 becomes a complex system calculation having multiple parameters (P in , C i , N, L n , C Loss , E n ), and it is possible to obtain results that satisfy the desired design policy (desired effect).
  • the algorithm may utilize any prior art, for example, a multi-objective optimization method.
  • the design device 200 can design an optical transmission system 301 as shown in FIG. 6A, due to an illuminance deviation of the light L1 irradiated to one end T1 of the bundle optical fiber, a power deviation occurs in the light L2 irradiated from the irradiation unit 13.
  • the design device 200 performs a design in which, for example, in a desired irradiation target area, an outer core (optical fiber 51a arranged on the outside) of the bundle optical fiber 36 is assigned to the path 14(1) to irradiate low-power light L2 in a location where low power is sufficient, and a core near the center of the bundle optical fiber 36 (optical fiber 51a arranged near the center) is assigned to the path 14(2) to irradiate high-power light L2 in a location where high power is required.
  • the light L1 from the light source unit 11 can be efficiently coupled to the bundle optical fiber 36 and irradiated onto the irradiation target area, so that wasteful power consumption of the light source unit 11 can be reduced.
  • the design device 200 can design the irradiation unit 13 to irradiate light L2 of the same power based on the relationship between coupling efficiency and distance (propagation loss). By designing in this way, it is possible to achieve even illumination of the target area with light.
  • the optical system 11c capable of adjusting the optical spot of the light L1 from the light source unit 11, in comparison with the optical transmission system 301 described in FIG. 4.
  • the optical system 11c makes it easy to adjust the coupling efficiency (C i ).
  • the light source unit 11 is an LED.
  • the light source unit 11 is not limited to an LED, and may be a light source (for example, an incandescent lamp or a discharge lamp) having the following optical characteristics. - There is variation in wavelength, amplitude, or phase. ⁇ Light is scattered. ⁇ It is a natural release.
  • Optical system 11 Light source unit 11a: Ultraviolet light source unit 11c: Optical system 12: Light distribution unit (equal branching) 13, 13-1, ..., 13-n, ..., 13-N: Irradiation unit 14: Path (each single-core optical fiber 51a bundled in the bundle optical fiber 36) 16: Optical transmission path 36: Bundle optical fiber 51a: Single-core optical fiber 200: Design device 300, 301: Optical transmission system L1, L2: Light Lc: Size of optical spot AR1, AR2, ..., ARn, ..., ARN: Irradiation target area

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Pour résoudre les problèmes, le but de la présente invention est de fournir un procédé de conception pour calculer des paramètres de système de transmission optique satisfaisant aux conditions requises pour un système de transmission optique à l'aide d'une source de lumière telle qu'une DEL et une fibre optique groupée en tant que trajet de transmission optique.　Un procédé de conception selon la présente invention conçoit un système de transmission optique 301 comprenant une source de lumière 11 qui émet de la lumière L1, une fibre optique groupée 36 obtenue par regroupement d'une pluralité de fibres optiques et transmettant la lumière L1, une pluralité d'unités de rayonnement 13 émettant chacune de la lumière L2 vers chaque zone cible de rayonnement, et une pluralité de fibres optiques à âme unique 51a séparées de la fibre optique groupée 36 et propageant la lumière vers chaque unité de rayonnement 13, le procédé de conception étant caractérisé par l'ajustement des paramètres du système de transmission optique 301 de telle sorte que la puissance de la lumière L2 délivrée par chaque unité de rayonnement 13 et calculée à l'aide des paramètres est une valeur prenant en compte l'énergie requise pour chaque zone cible de rayonnement.
PCT/JP2022/038672 2022-10-18 2022-10-18 Procédé de conception de système de transmission optique et dispositif de conception WO2024084561A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0430105A (ja) * 1990-05-26 1992-02-03 Matsushita Electric Works Ltd ファイバ光源装置
JP2000501548A (ja) * 1995-11-29 2000-02-08 ファーライト コーポレーション ユニバーサル遠隔照明システム
JP2003322730A (ja) * 2002-04-30 2003-11-14 Sumitomo Electric Ind Ltd バンドルファイバ、これを用いた光源装置およびその製造方法
US20060140558A1 (en) * 2004-12-29 2006-06-29 Michaloski Paul F Optical fiber bundles and devices including them
JP2015212688A (ja) * 2014-04-18 2015-11-26 Ｄｒｃ株式会社 光照射装置と光透過特性の測定方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0430105A (ja) * 1990-05-26 1992-02-03 Matsushita Electric Works Ltd ファイバ光源装置
JP2000501548A (ja) * 1995-11-29 2000-02-08 ファーライト コーポレーション ユニバーサル遠隔照明システム
JP2003322730A (ja) * 2002-04-30 2003-11-14 Sumitomo Electric Ind Ltd バンドルファイバ、これを用いた光源装置およびその製造方法
US20060140558A1 (en) * 2004-12-29 2006-06-29 Michaloski Paul F Optical fiber bundles and devices including them
JP2015212688A (ja) * 2014-04-18 2015-11-26 Ｄｒｃ株式会社 光照射装置と光透過特性の測定方法

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