WO2023053363A1 - レンズユニット、光導波路デバイス、および光送信装置 - Google Patents

レンズユニット、光導波路デバイス、および光送信装置 Download PDF

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Publication number
WO2023053363A1
WO2023053363A1 PCT/JP2021/036194 JP2021036194W WO2023053363A1 WO 2023053363 A1 WO2023053363 A1 WO 2023053363A1 JP 2021036194 W JP2021036194 W JP 2021036194W WO 2023053363 A1 WO2023053363 A1 WO 2023053363A1
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WO
WIPO (PCT)
Prior art keywords
optical waveguide
optical
lens unit
lens
optical fiber
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/JP2021/036194
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English (en)
French (fr)
Japanese (ja)
Inventor
圭 加藤
秀樹 一明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Osaka Cement Co Ltd
Original Assignee
Sumitomo Osaka Cement Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Osaka Cement Co Ltd filed Critical Sumitomo Osaka Cement Co Ltd
Priority to PCT/JP2021/036194 priority Critical patent/WO2023053363A1/ja
Priority to CN202180094739.1A priority patent/CN116888517A/zh
Priority to US18/555,920 priority patent/US12607810B2/en
Priority to JP2023550927A priority patent/JP7758045B2/ja
Publication of WO2023053363A1 publication Critical patent/WO2023053363A1/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
    • G02B6/26—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
    • G02B6/26—Optical coupling means
    • G02B6/30—Optical coupling means for use between fibre and thin-film device
    • 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
    • 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
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • 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
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4206—Optical features
    • 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
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
    • 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
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/4236—Fixing or mounting methods of the aligned elements
    • G02B6/4244—Mounting of the optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 

Definitions

  • optical modulation elements In high-speed/large-capacity optical fiber communication systems, optical transmitters incorporating waveguide-type optical elements that perform optical modulation (hereinafter referred to as optical modulation elements) are often used.
  • an optical modulation element using LiNbO 3 (hereinafter also referred to as LN) having an electro-optic effect as a substrate uses a semiconductor material such as indium phosphide (InP), silicon (Si), or gallium arsenide (GaAs). It is widely used in high-speed/large-capacity optical fiber communication systems because it can realize broadband optical modulation characteristics with less loss of light compared to conventional modulation elements.
  • optical modulation module for integration has been proposed.
  • the optical waveguide is formed on the substrate so that the optical input end and the optical output end of the optical waveguide are arranged on one side of the substrate constituting the optical modulation element.
  • FIG. 9 is a trihedral view showing an example of the configuration of a lens unit similar to the conventional lens means described in Patent Document 1.
  • FIG. 10 is a diagram showing an example of arrangement when optically coupling an optical waveguide and an optical fiber using the lens unit shown in FIG.
  • FIG. 9 is a front view of the lens unit 90, the left figure is a side view of the lens unit 90 seen from the left side of the front view, and the upper figure is a lens unit seen from above the front view. 90 is a side view of FIG.
  • the substrate 94 on which the optical waveguide 93 is formed is placed inside the housing (not shown). Fixed. Both ends of the lens unit 90 (for example, left and right hatched portions in the front view shown in FIG. 9) are clamped by clamp jigs 97a and 97b, and 97c and 97d (hereinafter collectively referred to as clamp jigs 97).
  • clamp jigs 97 are clamped by clamp jigs 97a and 97b, and 97c and 97d (hereinafter collectively referred to as clamp jigs 97).
  • the lens unit 90 is held in the thickness direction, and the lens unit 90 is aligned at a proper position so that the power of the light incident from the optical waveguide 93 and output from the optical fiber 95 is maximized.
  • the thickness L90 of the holding portion 92 depends on the NA (Numerical Aperture) of the optical waveguide 93. need to be small. Also, the NA of the optical waveguide 93 increases as the mode field diameter of the optical waveguide 93 decreases.
  • an object of the present invention is to improve the mechanical strength of a lens that optically couples an optical waveguide provided on a substrate and an optical fiber.
  • One aspect of the present invention is a lens unit that optically couples an optical waveguide provided on a substrate and an optical fiber, the lens unit including a lens portion and a holding portion that holds the lens portion. and the holding portion has a larger thickness than other portions of the holding portion measured in the direction of the optical axis along one side surface of the lens portion that is not a surface through which the optical axis passes.
  • a lens unit having a thick portion is arranged along one direction, and the thick portion of the holding portion extends along the arrangement direction of the lens portions.
  • the holding portion further has a thickness measured in the direction of the optical axis on the other side surface facing the one side surface with the lens portion interposed therebetween. has a thicker portion than the thickness of the portion of According to another aspect of the present invention, the thickness of the thick portion on the other side surface of the holding portion is thinner than the thickness of the thick portion on the one side surface. According to another aspect of the invention, the thickened portion has a sloped portion whose thickness continuously decreases toward the lens portion.
  • Another aspect of the present invention includes an optical waveguide element having an optical waveguide provided on a substrate, a housing for accommodating the optical waveguide element, and an input optical fiber for propagating input light and output light of the optical waveguide element.
  • the optical waveguide element is an optical modulation element that modulates and outputs input light from the input optical fiber, and an electronic device for driving the optical waveguide element is provided inside the casing. have a circuit.
  • an optical transmitter comprising any one of the optical waveguide devices described above and an electronic circuit for generating an electrical signal for causing the optical waveguide element to perform a modulating operation.
  • FIG. 1 is a trihedral view showing the configuration of a lens unit 10 according to the first embodiment of the present invention.
  • the lower right figure is a front view of the lens unit 10
  • the left figure is a side view of the lens unit 10 seen from the left side of the front view
  • the upper figure is a view from above the front view.
  • 3 is a side view of the lens unit 10;
  • the holding portion 12 is not a surface through which the optical axis 13 of the lens portion 11 passes in a range not including the lens portion 11 (that is, the lens surface 121 and the support surface).
  • the holding portion 12 is not a surface through which the optical axis 13 of the lens portion 11 passes in a range not including the lens portion 11 (that is, the lens surface 121 and the support surface).
  • the thick portion 12a (hatched portion in the figure) whose thickness L11 measured in the direction of the optical axis 13 is greater than the thickness L10 of the other portion of the holding portion 12.
  • the thick portion 12a includes, for example, the entire side surface 123 .
  • the thickness L10 of the holding portion 12, which is the distance from the support surface 122 to the lens portion 11, is maintained at a constant value, and the thick portion 12a having a larger thickness L11 allows The mechanical strength of the lens unit 10 as a whole can be improved.
  • the lens unit 10 for example, in the alignment work when optically coupling the optical waveguide and the optical fiber using this, the lens unit 10 can be clamped by holding the thick portion 12a with a clamp jig. It is possible to prevent damage such as deformation and breakage from occurring.
  • the lens unit 10 is mounted, for example, with the side surface 123 along the thick portion 12a facing the opening direction of the case 15 (upward in the figure).
  • the thick portion 12a of the lens unit 10 is gripped by clamp jigs 18a and 18b and inserted into the case 15 from above in the figure.
  • the lens unit 10 is gripped in a direction orthogonal to the direction of the optical axis 13 of the lens unit 10 from the side surfaces 125 and 126 of the lens unit 10, similar to the clamp jigs 98a and 98b shown in FIG. It can be a thing.
  • the position of the lens unit 10 is adjusted by the clamping jigs 18a and 18b, and the supporting surface 122 is adhesively fixed to the end of the optical waveguide element 14 after the adjustment.
  • the portions other than the thick portion 12a are thinner than the thick portion 12a. Therefore, as shown in FIG. can be inserted under As a result, it is possible to prevent the size of the case 15 from increasing due to the presence of the thick portion 12a.
  • FIG. 3 is a diagram showing the configuration of a lens unit 20 according to a first modified example.
  • the lower right figure is a front view of the lens unit 20
  • the left figure is a side view of the lens unit 20 seen from the left side of the front view
  • the upper figure is a view from above the front view.
  • 3 is a side view of the lens unit 20;
  • FIG. 3 the same reference numerals as those in FIG. 1 are used to denote the same constituent elements as those of the lens unit 10 shown in FIG. 1, and the above description of FIG. 1 is used.
  • the lens unit 20 has the same configuration as the lens unit 10 shown in FIG. It extends along the direction in which the lens portions 11 are arranged.
  • the lens portion 11 and the holding portion 22 of the lens unit 20 are integrally constructed of, for example, the same material, and the lens portion 11 is formed on the lens surface 221, which is one surface of the holding portion 22. It is A supporting surface 222 of the holding portion 22 facing the lens surface 221 is supported by being adhesively fixed to an end surface of a substrate on which an optical waveguide is formed (hereinafter also referred to as an optical waveguide substrate), for example.
  • the thick portion 22a is measured in the direction of the optical axis 13 along one side surface 223 that is not the surface through which the optical axis 13 of the lens portion 11 passes (that is, is not the lens surface 221 and the support surface 222).
  • the thickness L21 is formed to be larger than the thickness L20 of the other portion of the holding portion 22, and is provided in the portion not including the lens portion 11. As shown in FIG.
  • the thickness L20 of the holding portion 22, which is the distance from the supporting surface 222 to the lens portion 11, is maintained at a constant value, and the thickness L21, which is greater than this, is maintained.
  • the mechanical strength of the lens unit 20 as a whole can be improved by the thick portion 22a.
  • the thick portion 22a is formed to extend in the arrangement direction of the lens portions 11, so the bending strength along the arrangement direction is improved. Therefore, in the lens unit 20, it is possible to prevent the support surface 222 from being curved due to stress from the clamping jig during alignment, for example, and the adhesion to the optical waveguide substrate being deteriorated.
  • lens units 11 to be arranged is three in the example of FIG.
  • FIG. 4 is a diagram showing the configuration of a lens unit 30 according to a second modified example. 4, the lower right figure is a front view of the lens unit 30, the left figure is a side view of the lens unit 30 seen from the left side of the front view, and the upper figure is a view from above the front view. 3 is a side view of the lens unit 30; FIG. 4, the same reference numerals as those in FIGS. 1 and 3 are used for the same constituent elements as those shown in FIGS. invoke.
  • the lens unit 30 has the same configuration as the lens unit 20 shown in FIG.
  • the holding portion 22-1 has a configuration similar to that of the holding portion 22, but in addition to the thick portion 22a provided along the side surface 223, the other side surface 224 facing the side surface 223 with the lens portion 11 interposed therebetween is provided.
  • a thick portion 22b is provided.
  • the thickness L22 of the thick portion 22b is, for example, thinner than the thickness L21 of the thick portion 22a (L22 ⁇ L21).
  • the thickness L22 of the thick portion 22b is formed thinner than the thickness L21 of the thick portion 22a. If it is necessary to dispose the optical assembly 17 as shown in FIG. 2, a place for arranging such an optical assembly 17 can be secured on the side of the thick portion 22b, as in the configuration shown in FIG.
  • 2nd Embodiment is an optical waveguide device comprised using the lens unit 20 or 30 which concerns on the modification of 1st Embodiment mentioned above.
  • FIG. 5 is a diagram showing an example of the configuration of an optical waveguide device 50 according to the second embodiment. 6 is a cross-sectional view of the optical waveguide device 50 shown in FIG. 5 taken along line XI-XI.
  • An optical waveguide device 50 shown in FIG. 5 includes, as an example, the lens unit 30 shown in FIG.
  • FIGS. 5 and 6 the same reference numerals as those shown in FIG. 4 are used for the same constituent elements as those shown in FIG. 4, and the above description of FIG. 4 is used.
  • the optical waveguide device 50 includes an optical waveguide element 51 having an optical waveguide 51b provided on a substrate 51a, a housing 52 accommodating the optical waveguide element 51, and an input for propagating the input light and the output light of the optical waveguide element 51. and an optical fiber 53 and an output optical fiber 54 .
  • a lens unit 30 is arranged between the optical waveguide element 51 and the input optical fiber 53 and the output optical fiber 54 .
  • the housing 52 is composed of, for example, a case 521 which is a hexahedron and has an open surface (the surface shown in FIG. 5), and a cover 522 which covers the open surface of the case 521 . Although only part of the cover 522 is shown in FIG. 5, it should be understood that the cover 522 is configured to cover the entire opening of the case 521.
  • the optical waveguide element 51 is, for example, a folded optical modulation element that performs DP-QPSK modulation, in which an optical waveguide 51b, which is a convex waveguide, is formed on a substrate 51a using LN.
  • DP-QPSK modulators can be constructed using so-called nested Mach-Zehnder optical waveguides.
  • a signal electrode (not shown) for controlling light waves propagating through the optical waveguide 51b is formed on the substrate 51a according to the prior art.
  • These signal electrodes are connected to signal pins 57 provided in the case 521 via a relay board 56 arranged in the case 521 .
  • the light propagation direction of the optical waveguide 51b of the optical waveguide element 51 is folded back on the substrate 51a, and one light input end and two light output ends of the optical waveguide 51b are arranged on one end surface of the substrate 51a.
  • the sum of the number of incident lights entering the optical waveguide element 51 and the number of outgoing lights emitted from the optical waveguide element 51 is 3, and the lens unit 30 has the same number of lens portions 11 as this.
  • the light incident from the input optical fiber 53 is collimated by the lens 532 and then condensed by one lens portion 11 of the lens unit 30 and coupled to the light input end of the optical waveguide element 51 .
  • the two emitted lights emitted from the light output end of the optical waveguide element 51 are two linearly polarized lights, collimated by the other two lens portions 11 of the lens unit 30, and then polarized by the optical assembly 55. to form a single light beam.
  • the optical assembly 55 includes a beam shift prism that translates the optical axis of the input light from the input optical fiber 53 and polarization-combines the two emitted lights from the optical waveguide 51b, according to the conventional technology for DP-QPSK modulators. may include a half-wave plate and a polarization combining prism for.
  • the polarization-combined light beams output from optical assembly 55 are collected by lens 542 and coupled into output optical fiber 54 .
  • the lens unit 30 is arranged so that the side surface 223 along the thick portion 22a faces the opening of the case 521 (that is, the upper side in FIG. 6). Thereby, the lens unit 30 is held by a clamping jig or a suction jig lowered from the opening of the case 521 during the alignment work in the manufacturing process of the optical waveguide device 50, and its position is adjusted. After that, the support surface 222 of the lens unit 30 is fixed to the end surface of the optical waveguide element 51 with an optical adhesive.
  • the optical assembly 55 is arranged close to the lens section 11 to a position where it enters under the thick section 22 a of the lens unit 30 . That is, the optical assembly 55 and the thick portion 22a along the side surface 223 of the lens unit 30 have portions that overlap each other when viewed from the opening of the case 521 (the hatched portion in FIG. 5 and the thick portion 22a in FIG. 6). The range indicated by symbol A shown in ).
  • the lens unit 30 Since the optical waveguide device 50 having the above configuration is configured using the lens unit 30, the lens unit 30 is prevented from being deformed or damaged during the alignment work of the optical system during manufacturing. Manufacturing yield can be improved.
  • the optical assembly 55 can be mounted so as to have a portion overlapping the thick portion 22a of the lens unit 30 in a plan view seen from the opening of the case 521. Even if there is, an increase in the length dimension of the case 521 can be suppressed.
  • the optical waveguide device 50 may be configured using the lens unit 20 instead of the lens unit 30 . Even when the lens unit 20 is used, the same effects as those of the optical waveguide device 50 described above can be obtained.
  • FIG. 7 is a diagram showing the configuration of an optical waveguide device 60 according to the third embodiment. 7, the same components as in the optical waveguide device 50 shown in FIGS. 5 and 6 are denoted by the same reference numerals as in FIGS. Use the description.
  • the optical waveguide device 60 shown in FIG. 7 has the same configuration as the optical waveguide device 50 shown in FIG. As described with reference to FIG. 5, the optical waveguide element 51 is an optical modulation element that modulates and outputs the input light from the input optical fiber 53, such as a DP-QPSK modulator.
  • the drive circuit 61 is implemented, for example, in the form of an integrated circuit (IC).
  • the drive circuit 61 generates a high-frequency electric signal for driving the optical waveguide element 51 based on, for example, a modulated signal externally supplied via the signal pin 57, and transmits the generated high-frequency electric signal to the substrate of the optical waveguide element 51. Output to a signal electrode (not shown) formed on 51a.
  • the optical waveguide device 60 having the above configuration uses the lens unit 30 having the thick portion 22a as in the optical waveguide device 50 according to the second embodiment, the length dimension of the case 521 can be increased. While suppressing this, it is possible to prevent the lens unit 30 from being deformed or damaged during manufacturing, thereby improving the manufacturing yield.
  • the lens unit 20 may be used in place of the lens unit 30, similarly to the optical waveguide device 50 shown in FIG. Even when the lens unit 20 is used, the same effects as those described above can be obtained.
  • FIG. 8 is a diagram showing the configuration of an optical transmission device 70 according to this embodiment.
  • This optical transmitter 70 has an optical waveguide device 50 , a light source 71 for emitting light to the optical waveguide device 50 , a modulator driver 72 , and a modulation signal generator 73 .
  • the modulation signal generator 73 is an electronic circuit that generates an electrical signal for causing the optical waveguide element 51 of the optical waveguide device 50 to perform a modulation operation.
  • the modulation signal generator 73 generates a modulation signal, which is a high-frequency signal, for causing the optical waveguide element 51 to perform an optical modulation operation according to the transmission data given from the outside, and outputs the modulation signal to the modulator driving section. 72.
  • the modulator driver 72 amplifies the modulated signal input from the modulated signal generator 73 and outputs a high-frequency electric signal (driving signal) for driving the signal electrode of the optical waveguide element 51 included in the optical waveguide device 50. do.
  • An optical waveguide device 60 having a driving circuit 61 corresponding to the modulator driving section 72 can be used instead of the optical waveguide device 50 and the modulator driving section 72 .
  • the lens unit 20 or 30 according to the second and third embodiments described above suppresses an increase in the size of the housing 52 and improves the manufacturing yield. Since 50 or 60 is used, cost can be reduced without increasing size.
  • the lens portion 11 is configured with a convex curved surface, but the present invention is not limited to this.
  • the lens portion 11 may be a Fresnel lens having a saw-toothed cross section, or a refractive index distribution lens configured to change the refractive index according to the distance from the optical axis center.
  • the lens portion 11 may be configured with a concave curved surface depending on the optical design between the optical waveguide and the optical fiber.
  • the lens units 10, 20, and 30 are formed by press-working glass heated to a softening point or higher to form the lens portion 11 and the holding portions 12 and 22, or 22-1 are configured integrally, but the configuration is not limited to this.
  • the lens units 10, 20, 30 may be made by pressing transparent plastic.
  • the lens units 10, 20, and 30 may be configured by combining the separately manufactured lens portion 11 and the holding portions 12, 22, or 22-1.
  • the thick portions are provided on one or two side surfaces of each holding portion, but the thick portions are provided on three or more side surfaces of the holding portion. They may be provided independently or in series.
  • a lens unit for optically coupling an optical waveguide provided on a substrate and an optical fiber comprising a lens portion and a holding portion for holding the lens portion, wherein the holding portion has a thick portion along one side surface of the lens portion that is not the surface through which the optical axis passes, the thickness of the holding portion measured in the direction of the optical axis is greater than that of other portions of the holding portion.
  • lens unit According to the lens unit of configuration 1, it is possible to increase the mechanical strength and prevent deformation and damage of the lens unit during operations such as alignment.
  • (Configuration 2) The lens according to Configuration 1, including a plurality of the lens portions arranged along one direction, wherein the thick portion of the holding portion extends along the arrangement direction of the lens portions. unit.
  • the lens unit of configuration 2 it is possible to prevent the lens unit from being bent along the direction in which the lens portions are arranged, thereby preventing, for example, the adhesion between the lens unit and the end face of the optical waveguide substrate from deteriorating. be able to.
  • the thickness measured in the direction of the optical axis on the other side surface facing the one side surface with the lens portion interposed therebetween is greater than the thickness of the other portion of the holding portion. 3.
  • (Arrangement 4) The lens unit according to Arrangement 3, wherein the thickness of the thick portion of the holding portion on the other side surface is thinner than the thickness of the thick portion on the one side surface.
  • two thick portions are provided to further improve the mechanical strength, and for example, when disposing other parts such as an optical assembly between the optical waveguide and the optical fiber in the housing. By arranging these other parts near the thin thick portion, it is possible to suppress an increase in the size of the housing due to the provision of the thick portion.
  • (Structure 6) An optical waveguide element having an optical waveguide provided on a substrate, a housing for accommodating the optical waveguide element, and an input optical fiber and an output optical fiber for propagating the input light and the output light of the optical waveguide element and a lens unit according to any one of configurations 1 to 5 arranged between the optical waveguide element and the input optical fiber and the output optical fiber. According to the optical waveguide device of configuration 6, it is possible to prevent the lens unit from being deformed or damaged during manufacturing while suppressing an increase in the housing size, thereby improving the manufacturing yield.
  • the optical waveguide element has, on one end surface of the substrate, an optical input end of the optical waveguide that receives the input light and an optical output end of the optical waveguide that outputs the output light, and the input
  • the optical fiber and the output optical fiber are both fixed to one surface of the housing, and the lens unit arranged between the optical waveguide element and the input optical fiber and the output optical fiber is the optical waveguide element.
  • the optical waveguide device according to configuration 7 comprising the lens portions in a number equal to the sum of the number of incident lights entering the waveguide element and the number of outgoing lights emitted from the optical waveguide element.
  • the optical waveguide element having the optical input end and the optical output end on one end surface of the substrate, the input optical fiber and the output optical fiber are combined into one lens unit with improved mechanical strength. can be optically coupled to improve manufacturing yield.
  • the optical waveguide element is an optical modulation element that modulates and outputs input light from the input optical fiber, and an electronic circuit that drives the optical waveguide element is provided inside the housing.
  • the optical waveguide device according to any one of 6 to 9. According to the optical waveguide device of configuration 10, since the electronic circuit for driving the optical waveguide element, which is the optical modulation element, is accommodated in the housing, excellent optical modulation characteristics can be realized.
  • Driver circuit 70 Optical transmitter 71 Light source 72 Modulator driver 73 Modulated signal generator.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Couplings Of Light Guides (AREA)
PCT/JP2021/036194 2021-09-30 2021-09-30 レンズユニット、光導波路デバイス、および光送信装置 Ceased WO2023053363A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2021/036194 WO2023053363A1 (ja) 2021-09-30 2021-09-30 レンズユニット、光導波路デバイス、および光送信装置
CN202180094739.1A CN116888517A (zh) 2021-09-30 2021-09-30 透镜单元、光波导器件及光发送装置
US18/555,920 US12607810B2 (en) 2021-09-30 2021-09-30 Lens unit, optical waveguide device, and optical transmission device
JP2023550927A JP7758045B2 (ja) 2021-09-30 2021-09-30 光導波路デバイス、および光送信装置

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Application Number Priority Date Filing Date Title
PCT/JP2021/036194 WO2023053363A1 (ja) 2021-09-30 2021-09-30 レンズユニット、光導波路デバイス、および光送信装置

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