WO2014034458A1 - 光モジュールと光コネクタとの接続構造 - Google Patents
光モジュールと光コネクタとの接続構造 Download PDFInfo
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- WO2014034458A1 WO2014034458A1 PCT/JP2013/072068 JP2013072068W WO2014034458A1 WO 2014034458 A1 WO2014034458 A1 WO 2014034458A1 JP 2013072068 W JP2013072068 W JP 2013072068W WO 2014034458 A1 WO2014034458 A1 WO 2014034458A1
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- optical
- diffraction grating
- optical connector
- optical module
- module
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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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12004—Combinations of two or more optical elements
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/1228—Tapered waveguides, e.g. integrated spot-size transformers
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/124—Geodesic lenses or integrated gratings
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/125—Bends, branchings or intersections
-
- 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
- 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
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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
- G02B6/24—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
- G02B6/4228—Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements
- G02B6/423—Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements using guiding surfaces for the alignment
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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
- G02B6/24—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
- G02B6/424—Mounting of the optical light guide
- G02B6/4242—Mounting of the optical light guide to the lid of the package
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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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B2006/12083—Constructional arrangements
- G02B2006/12107—Grating
Definitions
- the present invention relates to a connection structure between an optical module and an optical connector.
- optical module Silicon photonics technology
- Non-Patent Document 1 as a connection structure between such an optical module and an optical fiber, a 45-degree mirror and an optical fiber are integrated on the surface of an optical module in which a lens is provided on a surface-emitting / receiving optical element. A structure for connecting an optical connector is disclosed.
- Non-Patent Document 2 as an optical connection structure in which an optical waveguide using a silicon-based material such as silicon or silicon nitride as a waveguide core is connected in the vertical direction to the optical module, a diffraction grating is formed on the optical waveguide side,
- a structure is disclosed in which the optical fiber is tilted about 10 degrees and connected to the optical module.
- Non-Patent Document 3 also discloses a structure in which converted optical axes are inclined with respect to a vertical direction, and diffraction gratings having the same structure are connected to each other so that their optical axes are aligned.
- an object of the present invention is to provide a connection structure between an optical module and an optical connector that can be easily and surely worked and can save space when connecting an optical fiber and an optical module. It is.
- the present invention employs the following means in order to solve the above problems. That is, the present invention includes an optical module having a first optical waveguide formed along the surface of a substrate, a second optical waveguide optically coupled to the first optical waveguide, and the light And an optical connector mechanically connected to the module, wherein the optical module is provided at a connection surface to which the optical connector is connected and an end of the first optical waveguide, A first diffraction grating that converts an optical axis direction of one optical waveguide to a direction toward an opposing surface of the optical connector, wherein the second optical waveguide is connected to the optical connector in the optical connector.
- the optical connector is provided at an end portion of the second optical waveguide, and the optical axis direction of the second optical waveguide is set along the connection surface of the optical module.
- Direction to A second diffraction grating for conversion wherein the optical module and the optical connector are mechanically connected in a state where the opposing surface of the optical connector is opposed to the connection surface of the optical module.
- the second diffraction grating are optically coupled to face each other.
- the first diffraction grating and the second diffraction grating face each other in a state where the optical module and the optical connector are mechanically connected with the connection surface of the optical module facing the connection surface. I tried to do it.
- the first optical waveguide of the optical module and the second optical waveguide of the optical connector are optically coupled via the first diffraction grating and the second diffraction grating.
- the second diffraction grating and the second optical waveguide are provided in the optical connector, it is only necessary to connect the optical connector to the optical module, and these connection operations can be performed easily and reliably. it can.
- the second optical waveguide is provided along the facing surface facing the connection surface in the optical connector, space saving can be achieved.
- FIG. 1 is a diagram illustrating a connection structure between the optical module 20A and the optical connector 30A.
- a plate-shaped optical connector 30A is opposed to a connection surface 20a formed on one surface of the optical module 20A, and these are mechanically detachably connected. Is done.
- an optical module 20A includes a substrate 21 made of silicon or the like, an optical waveguide (first optical waveguide) 22 formed on the substrate 21, a driver IC (Integrated Circuit) 23, And a module mold 24 made of resin that covers the substrate 21, the optical waveguide 22, and the driver IC 23.
- the substrate 21 may be formed using an SOI (Silicon on Insulator) substrate.
- the core layer (first core portion) 22 a of the optical waveguide 22 is formed in parallel with the surface 21 a of the substrate 21.
- the core layer 22a is made of, for example, silicon, and has a linearly continuous optical waveguide core 25, a diffraction grating (first diffraction grating) 26, a tapered waveguide core 27, an optical active element 28, and a light emitting element 29. And are provided.
- the core layer 22a is covered with a clad layer (first clad portion) 22b made of silicon dioxide or the like.
- the diffraction grating 26 has a rectangular shape in plan view, for example, and is provided at the tip of the optical waveguide core 25.
- the diffraction grating 26 has a width larger than the width of the optical waveguide core 25.
- the diffraction grating 26 diffracts light propagated in a direction parallel to the surface 21a of the substrate 21 via the optical waveguide core 25 and the tapered waveguide core 27, and the optical axis direction of the optical connector 30A is diffracted. The light is converted to a direction toward the facing surface 30a, and the light whose optical axis direction is converted is emitted from the connection surface 20a.
- the tapered waveguide core 27 is provided between the optical waveguide core 25 and the diffraction grating 26, and is formed so that the core width gradually increases in a tapered shape from the optical waveguide core 25 toward the diffraction grating 26.
- the optical active element 28 is provided in an intermediate portion of the optical waveguide core 25.
- a driver IC 23 is flip-mounted on the optical active element 28, and the optical active element 28 and the driver IC 23 are electrically connected via connection bumps 261 made of solder or the like. Connected.
- the light emitting element 29 is disposed on the outer peripheral edge of the substrate 21 and connected to the base end of the optical waveguide core 25.
- two or more optical waveguide cores 25 are provided in an array, and the optical waveguide cores 25 extend in parallel to each other, and the tapered waveguide core 27, the diffraction grating, and the like. 26 are arranged in parallel in the direction along the connection surface 20a of the optical module 20A.
- the plurality of optical waveguide cores 25 are connected to one light emitting element 29.
- the optical module 20A is formed with two or more fitting pins (engaging portions) 50 protruding from the connection surface 20a in a direction orthogonal to the connection surface 20a.
- the fitting pins 50 are disposed on both sides of the board 21.
- the fitting pin 50 may have, for example, a tapered shape whose outer diameter gradually decreases as it goes to the tip.
- the optical connector 30A includes an optical waveguide (second optical waveguide) 31 provided so as to continue along the facing surface 30a on the side facing the optical module 20A, and the optical waveguide 31. And a connector mold 32 for covering.
- the optical waveguide 31 includes a linearly continuous optical waveguide core 33, a tapered waveguide core 34, and a diffraction grating (second diffraction grating) 35 on a core layer (second core portion) 31a. Yes.
- the core layer 31a is covered with a clad layer (second clad portion) 31b.
- the optical waveguide core 33 is desirably formed using a flexible waveguide having flexibility.
- the optical waveguide 31 is preferably formed by using a polymer material in which the core layer 31a and the clad layer 31b have different refractive indexes (refractive index of the clad layer 31b ⁇ refractive index of the core layer 31a) or the like.
- the optical waveguide core 33 can also be formed using an optical fiber.
- the optical waveguide cores 33 can be compared with each other as compared with the optical fiber.
- the spacing can be designed relatively freely, and the optical waveguide core 33 and the cladding layer 31b can be bent freely, so that the fixing strength of the optical connector 30A can be relaxed. Needless to say, the optical connector 30A may be connected to an optical fiber.
- the tapered waveguide core 34 is provided between the optical waveguide core 33 and the diffraction grating 35, and is formed such that the core width gradually increases in a tapered shape from the optical waveguide core 33 toward the diffraction grating 35.
- the diffraction grating 35 has, for example, a rectangular shape in plan view, and is provided at the tip of the optical waveguide core 33 via a tapered waveguide core 34.
- the diffraction grating 35 has a width dimension larger than the width of the optical waveguide core 33.
- the core diameter of the optical waveguide core 33 may be equal to or larger than the width of the diffraction grating 35.
- the diffraction grating 35 diffracts light incident from the outside and converts the optical axis direction into a direction in which the tapered waveguide core 34 and the optical waveguide core 33 are continuous.
- a fitting hole (engaged portion) 51 into which each fitting pin 50 of the optical module 20A is inserted is formed in the facing surface 30a facing the connection surface 20a of the optical module 20A.
- the diffraction grating 26 converts the optical signal propagated through the core layer 22a of the optical waveguide 22 into a diffracted light by converting the optical axis thereof.
- the diffraction grating 35 has a function of coupling diffracted light to the core layer 31 a of the optical waveguide 31.
- the diffraction gratings 26 and 35 are separated from each other, the beam diameter is widened and the optical coupling efficiency is lowered. For this reason, it is preferable to give the diffraction gratings 26 and 35 a condensing function.
- the diffracted light can be collimated (parallel) light or condensed light, and even if the diffraction gratings 26 and 35 are separated from each other, optical coupling between them becomes easy.
- the diffracted light it is determined whether the diffracted light is collimated light or condensed light depending on the refractive index difference between the core layers 22a and 31a of the optical waveguides 22 and 31 and the clad layers 22b and 31b. It is possible to select appropriately within the design range.
- the shapes of the diffraction gratings 26 and 35 are obtained by using a time domain difference method (Finite Difference Time Domain, FDTD) or the like.
- FDTD Time Domain Time Domain
- the path length of light changes as light passes through the diffraction gratings 26 and 35, and the shape of the diffraction gratings 26 and 35 is changed based on the resulting time difference until the light reaches. This is a known technique for determining.
- the pitch of the diffraction gratings 26 and 35 the optical axis of the diffracted light is tilted (for example, about 10 degrees) in order to suppress the influence of reflection, and the diffraction efficiency of the optical signal propagated through the core layers 22a and 31a is increased.
- Non-Patent Document 4 T.A. Suhara et al. , IEEE Journal of Quantum Electronics, Volume QE22, No. 6, pp. 845-867 June 1986 (FIG. 23)
- continuous light output from the light emitting element 29 of the optical module 20 ⁇ / b> A propagates through the optical waveguide 22 and is modulated by the optical active element 28 according to the electric signal from the driver IC 23.
- the modulated light reaches the diffraction grating 26 as an optical signal S1 through the optical waveguide core 25 and the tapered waveguide core 27.
- the optical axis direction of the optical signal S1 is converted, and the optical signal S2 within the range of the optical field 41 is output from the optical module 20A along the optical axis 4 intersecting the connection surface 20a at a predetermined angle. Is done.
- the optical signal S2 output from the optical module 20A reaches the diffraction grating 35 of the optical connector 30A, and the optical axis direction is converted into an optical signal S3.
- the optical signal S3 is output to the outside via the tapered waveguide core 34 and the optical waveguide core 33 that constitute the optical waveguide 31.
- the diffraction grating 26 is provided in the optical waveguide 22 of the optical module 20A, and the diffraction grating 35 is provided in the optical waveguide 31 of the optical connector 30A, so that the optical module 20A and the optical connector 30A are mechanically connected.
- the diffraction gratings 26 and 35 are optically coupled in a state of facing each other. Thereby, the optical signal S2 emitted from the optical module 20A through the diffraction grating 26 is converted in the optical axis direction in the diffraction grating 35 on the optical connector 30A side, and the converted optical signal is opposed to the optical connector 30A. It propagates through the optical waveguide 31 that continues in the direction along 30a.
- the optical waveguide 31 of the optical connector 30A can be pulled out in the direction along the connection surface 20a with respect to the connection surface 20a of the optical module 20A. Therefore, space saving around the connecting portion between the optical module 20A and the optical connector 30A can be achieved. Further, since the optical waveguide 31 is incorporated in the optical connector 30A, the work can be easily and reliably performed.
- the diffraction gratings 26 and 35 are separated by at least the thickness of the driver IC 23.
- the diffraction gratings 26 and 35 have a condensing function, reliable optical coupling is possible even if the diffraction grating 26 of the optical module 20A and the diffraction grating 35 of the optical connector 30A are separated.
- the optical waveguide 22 of the optical module 20A and the optical waveguide 31 of the optical connector 30A can be separated from each other, so that the light emitting element 29, other driving elements, etc. are not limited to the driver IC 23.
- the optical connector 30A can be disposed on the optical module 20A mounted on the substrate 21. As a result, the degree of freedom in design increases, and the area of the package that combines the optical module 20A and the optical connector 30A can be reduced.
- the refractive index structure (refractive index ratio) between the diffraction grating 35 and the tapered waveguide core 34 of the core layer 31a of the optical connector 30B and the surrounding cladding layer 31b is the diffraction grating 26 of the optical module 20B.
- the refractive index structure (refractive index ratio) of the tapered waveguide core 27 and the surrounding cladding layer 22b is the same. That is, in the optical connector 30B and the optical module 20B, the diffraction grating 35 and the diffraction grating 26, the tapered waveguide core 34 and the tapered waveguide core 27, and the cladding layer 31b and the cladding layer 22b are formed of the same refractive index material. It is. Of course, different materials may be adopted as long as they have the same refractive index, but it is easy to form with the same material.
- the optical waveguide 31 of the optical connector 30B and the optical waveguide 22 of the optical module 20B are free from the influence of refraction at the boundary surface of each part due to the difference in refractive index. Becomes easy.
- the cladding layers 22b and 31b are formed in regions facing the light signal exit surface 26a of the diffraction grating 26 of the optical module 20C and the light signal entrance surface 35a of the diffraction grating 35 of the optical connector 30C, respectively.
- a gap (first recess) 61 and a gap (second recess) 62 that are notched to expose the exit surface 26a and the entrance surface 35a of the diffraction gratings 26 and 35 are formed.
- the diffraction gratings 26 and 35 can be made smaller. Furthermore, since the air, which is the same material, is filled in the gaps 61 and 62, the influence of refraction at the boundary surfaces of the respective parts due to the difference in refractive index between the optical module 20C and the optical connector 30C is eliminated. It becomes easy.
- FIG. 6 shows a connection structure between an optical module 20D having an optical waveguide 22 and an optical connector 30D having an optical waveguide 31, and the overall configuration is the same as the configuration shown in the first embodiment. To do.
- connection surface 20a of the optical module 20D includes a convex surface 71 along the surface 23a of the driver IC 23, a concave surface 72 set to the same height as the cladding layer 22b of the optical waveguide 22, and a convex portion. And a stepped portion 73 formed between the surface 71 and the recessed surface 72.
- the optical connector 30D is set to the same height as the clad layer 31b of the optical waveguide 31, and is formed through a convex surface 76 that faces the concave surface 72, and through the convex surface 76 and the stepped portion 77.
- the concave surface 72 and the convex surface 76 face each other, and therefore, compared with the configurations of the first to third embodiments.
- the diffraction gratings 26 and 35 are optically coupled in a close state. As a result, the influence of light scattering between the diffraction gratings 26 and 35 can be suppressed. Further, since the diffraction gratings 26 and 35 are optically coupled in the state of being close to each other, the tolerance of optical coupling between the diffraction gratings 26 and 35 is loosened, so that the optical module 20D and the optical connector 30D are connected. Optical coupling is possible even if the vertical positional accuracy is poor.
- the optical connector 30D includes the convex surface 76 and the concave surface 78.
- the diffraction grating 35 is disposed at a position facing the concave surface 72 of the optical module 20D.
- the shape and size may not include the concave surface 78 and the stepped portion 77.
- connection structure between the optical module and the optical connector of the present invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
- the diffraction gratings 26 and 35 are not used with a condensing function, and a configuration in which a diffraction grating having a condensing function is disposed between the diffraction grating 26 and the diffraction grating 35 is used. You may make it suppress scattering.
- the structure and the manufacturing process are complicated, and the additional diffraction grating having a condensing function is located on the surface of the optical module or optical connector, so that it is easy to get scratches and dirt, and the yield may deteriorate. There is sex.
- the use of the diffraction gratings 26 and 35 having a light collecting function can avoid such a problem.
- the fitting pins 50 and the fitting holes 51 are used.
- other configurations such as an engaging claw and an engaging recess to which the engaging claw is engaged may be used.
- the configurations described in the first to fourth embodiments can be appropriately combined.
- the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.
- the present invention can be applied to, for example, various apparatuses that perform data transmission using an optical signal.
- the present invention when connecting an optical fiber and an optical module, the work can be easily and reliably performed, and space can be saved.
- Optical modules 30A to 30D Optical connector 20a Connection surface 21 Substrate 21a Surface 22 Optical waveguide (first optical waveguide) 22a Core layer (first core part) 22b Cladding layer (first cladding part) 23 Driver IC (element) 23a Surface 24 Module mold 25 Optical waveguide core 26 Diffraction grating (first diffraction grating) 26a Emission surface 27 Tapered waveguide core 28 Optical active element 29 Light emitting element 30a Opposing surface 31 Optical waveguide (second optical waveguide) 31a Core layer (second core part) 31b Clad layer (second clad portion) 32 Connector mold 33 Optical waveguide core 34 Tapered waveguide core 35 Diffraction grating (second diffraction grating) 35a Incident surface 41 Optical field 50 Fitting pin (engaging part) 51 Fitting hole (engaged part) 61 Air gap (first recess) 62 Air gap (second recess) 71 Con
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Abstract
Description
非特許文献1には、このような光モジュールと光ファイバとの接続構造として、面発受光型の光素子上にレンズを設けた光モジュールに対し、その表面に45度ミラーと光ファイバを一体化した光コネクタを接続する構造が開示されている。
また、光ファイバの光モジュールへの接続に際し、光ファイバを光モジュールに対して所定の角度に調整し、さらにその角度を保持しなければならず、その難易度が高いうえに、光ファイバを保持するためのスペースも必要となる。
そこでなされた本発明の目的は、光ファイバと光モジュールとを接続するにあたり、作業を容易かつ確実に行い、しかも省スペース化を図ることのできる光モジュールと光コネクタとの接続構造を提供することである。
すなわち、本発明は、基板の表面に沿って形成された第1の光導波路を有する光モジュールと、前記第1の光導波路に光学的に結合される第2の光導波路を有するとともに、前記光モジュールに機械的に接続される光コネクタと、の接続構造であって、前記光モジュールは、前記光コネクタが接続される接続面と、前記第1の光導波路の端部に設けられ、前記第1の光導波路の光軸方向を前記光コネクタの対向面に向かう向きに変換する第1の回折格子と、を備え、前記光コネクタにおいて、前記第2の光導波路が、前記光コネクタにおいて前記接続面に対向する前記対向面に沿って設けられるとともに、前記光コネクタは、前記第2の光導波路の端部に設けられ、該第2の光導波路の光軸方向を前記光モジュールの前記接続面へ向かう向きに変換する第2の回折格子を備え、前記光モジュールの前記接続面に前記光コネクタの前記対向面を対向させて、前記光モジュールと前記光コネクタとを機械的に接続した状態で、前記第1の回折格子と前記第2の回折格子とが互いに対向して光学的に結合される。
図1は、光モジュール20Aと、光コネクタ30Aとの接続構造を示す図である。
この図1に示すように、光モジュール20Aと光コネクタ30Aは、光モジュール20Aの一面に形成された接続面20aに、プレート状の光コネクタ30Aを対向させ、これらが機械的に着脱可能に接続される。
この回折格子26は、光導波路コア25,テーパ導波路コア27を介して、基板21の表面21aと平行な方向に伝搬されてきた光を回折して、その光軸方向を、光コネクタ30Aの対向面30aに向かう向きに変換し、光軸方向が変換された光を接続面20aから出射させる。
嵌合ピン50は、例えば、先端部に行くにしたがいその外径が漸次縮小するテーパ形状としても良い。
ここで、回折格子26,35は距離が離れるとビーム径が広がり、光結合効率が下がってしまう。このため、回折格子26,35に集光機能を持たせるのが好ましい。これにより、回折光をコリメート(平行)光や集光光とすることができ、回折格子26,35どうしの距離が離れていても、これらの間での光結合が容易になる。なお、回折格子26,35において、光導波路22、31のコア層22a,31aとクラッド層22b,31bとの屈折率差に応じ、回折光をコリメート光とするか、集光光とするかを、設計の範囲で適宜選択することが可能である。
非特許文献4:T.Suhara et al.、IEEE Jounal of Quantum Electronics、第QE22巻、第6号、845-867頁 1986年6月 (図23)
回折格子26では、光信号S1の光軸方向が変換され、接続面20aに所定角度で交差する光軸4に沿って、光フィールド41の範囲内の光信号S2となって光モジュール20Aから出力される。
これにより、光モジュール20Aの接続面20aに対し、光コネクタ30Aの光導波路31を、接続面20aに沿った方向に引き出すことができる。したがって、光モジュール20Aと光コネクタ30Aとの接続部の周囲の省スペース化を図ることができる。
また、光導波路31が光コネクタ30Aに組み込まれているため、作業を容易かつ確実に行うことができる。
また、この構成を用いると、光モジュール20Aの光導波路22と、光コネクタ30Aの光導波路31とを離すことが可能となるため、ドライバIC23に限らず、発光素子29や、その他の駆動素子等を基板21上に実装した光モジュール20A上に、光コネクタ30Aを配置することが可能となる。これにより、設計の自由度が高まるとともに、光モジュール20Aと光コネクタ30Aとを合わせたパッケージの面積を抑えることが可能となる。
次に、本発明の第2の実施形態について説明する。以下に説明する第2の実施形態において、上記第1の実施形態と共通する構成については、図中に同符号を付してその説明を省略し、上記第1の実施形態との差異を中心に説明を行う。
図4に示すものは、光導波路22を有する光モジュール20Bと、光導波路31を有する光コネクタ30Bとの接続構造であり、全体的な構成は、上記第1の実施形態で示した構成と共通する。
次に、本発明の第3の実施形態について説明する。以下に説明する第3の実施形態において、上記第1の実施形態と共通する構成については、図中に同符号を付してその説明を省略し、上記第1の実施形態との差異を中心に説明を行う。
図5に示すものは、光導波路22を有する光モジュール20Cと、光導波路31を有する光コネクタ30Cとの接続構造であり、全体的な構成は、上記第1の実施形態で示した構成と共通する。
これにより、上記第1の実施形態のように、光モジュール20Cの回折格子26における光信号の出射面26aと、光コネクタ30Cの回折格子35における光信号の入射面35aのそれぞれに対向する領域が、クラッド層22b,31bで覆われている構成に比較し、回折格子26,35を小さくすることが可能となる。
さらに、空隙61,62に、同材料である空気が満たされることで、光モジュール20Cならびに光コネクタ30Cの屈折率差の違いに起因した各部の境界面での屈折の影響がなくなるため、設計が容易となる。
次に、本発明の第4の実施形態について説明する。以下に説明する第4の実施形態において、上記第1の実施形態と共通する構成については、図中に同符号を付してその説明を省略し、上記第1の実施形態との差異を中心に説明を行う。
図6に示すものは、光導波路22を有する光モジュール20Dと、光導波路31を有する光コネクタ30Dとの接続構造であり、全体的な構成は、上記第1の実施形態で示した構成と共通する。
一方、光コネクタ30Dは、光導波路31のクラッド層31bと同一高さに設定され、凹部面72に対向する凸部面76と、凸部面76と段部77を介して形成され、凸部面71と対向する凹部面78と、を有している。
なお、本発明の光モジュールと光コネクタとの接続構造は、図面を参照して説明した上述の各実施形態に限定されるものではなく、その技術的範囲において様々な変形例が考えられる。
例えば、上記第1~第4の実施形態では、回折格子26,35として集光機能を有したものを用いるのが好ましい、とした。しかし、回折格子26,35として集光機能を有したものを用いず、これら回折格子26と回折格子35との間に、集光機能を有した回折格子を配置する構成を用いて、光の散乱を抑えるようにしても良い。ただしその場合、構造および製造工程が複雑化し、さらに追設した集光機能を有する回折格子は光モジュールまたは光コネクタの表面に位置することになって傷や汚れがつきやすく、歩留まりが悪くなる可能性がある。これに対し、上記各実施形態で示したごとく、回折格子26,35として集光機能を有したものを用いれば、このような問題の発生を回避できる。
また、上記第1~第4の実施形態に記載の構成を適宜組み合わせることもできる。
これ以外にも、本発明の主旨を逸脱しない限り、上記実施形態で挙げた構成を取捨選択したり、他の構成に適宜変更したりすることが可能である。
20A~20D 光モジュール
30A~30D 光コネクタ
20a 接続面
21 基板
21a 表面
22 光導波路(第1の光導波路)
22a コア層(第1のコア部)
22b クラッド層(第1のクラッド部)
23 ドライバIC(素子)
23a 表面
24 モジュールモールド
25 光導波路コア
26 回折格子(第1の回折格子)
26a 出射面
27 テーパ導波路コア
28 光能動素子
29 発光素子
30a 対向面
31 光導波路(第2の光導波路)
31a コア層(第2のコア部)
31b クラッド層(第2のクラッド部)
32 コネクタモールド
33 光導波路コア
34 テーパ導波路コア
35 回折格子(第2の回折格子)
35a 入射面
41 光フィールド
50 嵌合ピン(係合部)
51 嵌合孔(被係合部)
61 空隙(第1の凹部)
62 空隙(第2の凹部)
71 凸部面
72 凹部面
73 段部
76 凸部面
77 段部
78 凹部面
Claims (7)
- 基板の表面に沿って形成された第1の光導波路を有する光モジュールと、前記第1の光導波路に光学的に結合される第2の光導波路を有するとともに、前記光モジュールに機械的に接続される光コネクタと、の接続構造であって、
前記光モジュールは、
前記光コネクタが接続される接続面と、
前記第1の光導波路の端部に設けられ、前記第1の光導波路の光軸方向を前記光コネクタの対向面に向かう向きに変換する第1の回折格子と、を備え、
前記光コネクタにおいて、
前記第2の光導波路が、前記光コネクタにおいて前記接続面に対向する前記対向面に沿って設けられるとともに、
前記光コネクタは、前記第2の光導波路の端部に設けられ、該第2の光導波路の光軸方向を前記光モジュールの前記接続面へ向かう向きに変換する第2の回折格子を備え、
前記光モジュールの前記接続面に前記光コネクタの前記対向面を対向させて、前記光モジュールと前記光コネクタとを機械的に接続した状態で、前記第1の回折格子と前記第2の回折格子とが互いに対向して光学的に結合される光モジュールと光コネクタとの接続構造。 - 前記第1の回折格子および前記第2の回折格子の少なくとも一方は、前記接続面または前記対向面から入出力する光の集光機能を有する請求項1に記載の光モジュールと光コネクタとの接続構造。
- 前記第1の光導波路の第1のコア部および前記第1の回折格子と、前記第1のコア部および前記第1の回折格子の周囲に設けられた第1のクラッド部との屈折率の比が、
前記第2の光導波路の第2のコア部および前記第2の回折格子と、前記第2のコア部および前記第2の回折格子の周囲に設けられた第2のクラッド部との屈折率の比と等しく設定されている請求項1または2に記載の光モジュールと光コネクタとの接続構造。 - 前記光モジュールは、前記第1の回折格子の表面を露出させる第1の凹部を有し、
前記光コネクタは、前記第2の回折格子の表面を露出させる第2の凹部を有する請求項1から3のいずれか一項に記載の光モジュールと光コネクタとの接続構造。 - 前記光モジュールは、前記基板または前記第1の光導波路上において、前記光コネクタが接続される側に実装された素子を備えている請求項1から4のいずれか一項に記載の光モジュールと光コネクタとの接続構造。
- 前記光モジュールは、
前記素子を覆うよう形成された凸部面と、
前記凸部面よりも前記基板に近い側に形成され、前記第1の回折格子に近接して形成された凹部面と、を有し、
前記光コネクタにおいて、前記凹部面に対向する位置に前記第2の回折格子が配置されている請求項5に記載の光モジュールと光コネクタとの接続構造。 - 前記光モジュールは、前記光コネクタに係合する係合部を有し、
前記光コネクタは、前記係合部が係合される被係合部を有する請求項1から6のいずれか一項に記載の光モジュールと光コネクタとの接続構造。
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