WO2023026963A1 - 光モジュール及び光通信デバイス - Google Patents
光モジュール及び光通信デバイス Download PDFInfo
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- WO2023026963A1 WO2023026963A1 PCT/JP2022/031300 JP2022031300W WO2023026963A1 WO 2023026963 A1 WO2023026963 A1 WO 2023026963A1 JP 2022031300 W JP2022031300 W JP 2022031300W WO 2023026963 A1 WO2023026963 A1 WO 2023026963A1
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- Prior art keywords
- optical
- ics
- fiber bundle
- power supply
- module
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Classifications
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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
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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
- G02B6/4246—Bidirectionally operating package structures
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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
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
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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
- G02B6/4266—Thermal aspects, temperature control or temperature monitoring
- G02B6/4268—Cooling
- G02B6/4269—Cooling with heat sinks or radiation fins
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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
- G02B6/4274—Electrical aspects
- G02B6/428—Electrical aspects containing printed circuit boards [PCB]
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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
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Definitions
- the present disclosure relates to an optical module that performs at least one of conversion from an optical signal to an electrical signal and vice versa, and an optical communication device that includes the optical module.
- Patent Document 1 A device that performs mutual conversion between an optical signal and an electrical signal is known (for example, Patent Document 1 below).
- a plurality of optical communication devices are attached to a host circuit board.
- Each optical communication device is configured to be capable of inputting and/or outputting multi-channel optical signals.
- optical signals can be transmitted by one host circuit board in the number of channels obtained by multiplying the number of channels of each optical communication device by the number of optical communication devices.
- Each optical communication device is attached to a host circuit board by a connector.
- An optical module includes a module substrate, multiple optical ICs, multiple fiber bundles, multiple optical connectors, at least one control IC, and at least one power supply IC. ing.
- the module substrate has a first surface extending in a first direction and a second direction orthogonal to the first direction.
- the plurality of optical ICs are mounted on the first surface at different positions in the first direction, and perform photoelectric conversion.
- the plurality of fiber bundles each have a plurality of optical fibers extending parallel to each other, and extend from the plurality of optical ICs to the first side in the second direction.
- the plurality of optical connectors are positioned at ends of the plurality of fiber bundles opposite to the plurality of optical ICs, and are connected to an external optical element so as to be capable of transmitting optical signals.
- the at least one control IC is mounted on the module substrate and controls at least one of the plurality of optical ICs.
- the at least one power IC is mounted on the module substrate and supplies power to at least one of the plurality of optical ICs.
- An optical communication device includes the above optical module and a motherboard electrically connected to the optical module.
- FIG. 1 is an exploded perspective view of an optical module according to an embodiment of the present disclosure
- FIG. FIG. 2 is an exploded perspective view of the optical module in FIG. 1 as seen from a direction different from that in FIG. 1
- FIG. 2 is a schematic diagram showing an example of the configuration of a part of the signal processing system of the optical module in FIG. 1
- FIG. 4 is a schematic plan view showing another example of arrangement of a plurality of optical ICs included in an optical module
- FIG. 4 is a schematic plan view showing still another example of the arrangement of a plurality of optical ICs included in an optical module
- FIG. 4 is a schematic plan view showing another example of the configuration of the signal processing system of the optical module
- FIG. 4 is an exploded perspective view showing another example of a cooling component included in the optical module; Sectional drawing in the VIIa-VIIa line of FIG. Sectional drawing in the VIIb-VIIb line of FIG.
- FIG. 7 is a side view of the cooling component of FIG. 6;
- FIG. 5 is a cross-sectional view showing still another example of a cooling component;
- FIG. 8B is a cross-sectional view showing the cooling component of FIG. 8A in a different state than FIG. 8A;
- FIGS. 1 to 3 will be described first, and then various other examples (FIGS. 4A to 8B) will be described.
- the description of the other examples basically only describes the differences from the previously described aspects (embodiments, etc.). Matters that are not particularly mentioned may be the same as or inferred from the previously described aspects. Also, the description of one aspect may be incorporated into other aspects as long as there is no contradiction.
- FIG. 1 is an exploded perspective view of an optical module 1 according to an embodiment of the present disclosure, viewed from the +z side.
- FIG. 2 is an exploded perspective view of the optical module 1 viewed from the -z side.
- the optical module 1 performs at least one of conversion from an optical signal to an electrical signal and conversion from an electrical signal to an optical signal.
- the optical module 1 is configured to be capable of inputting and/or outputting multi-channel optical signals.
- the optical module 1 is electrically connected to, for example, an external electronic device (for example, the motherboard 3 indicated by the dotted line in FIG. 2). Also, the optical module 1 is optically connected to an optical element (for example, an optical waveguide (not shown)) outside the optical module 1 .
- the optical module 1 is used for signal transmission between the mother board 3 and a mating device (not shown) connected to the tip of the optical waveguide (or a mating device having an optical waveguide; hereinafter the same). contribute. From another point of view, the optical module 1 contributes to the transmission of information between the motherboard 3 and the mating device.
- optical waveguides include those having a sheet-like or plate-like structure in addition to optical fibers.
- the optical module 1 may be optically connected to an external light emitting element or light receiving element without an external optical waveguide.
- expressions may be made on the premise that the optical module 1 is connected to an external optical waveguide.
- the mating device to be optically connected may be, for example, another electronic device that performs optical communication with the electronic device including the motherboard 3 or a device within the electronic device including the motherboard 3 .
- the optical module 1 does not substantially modify the information contained in the input and/or output optical signals, but only contributes to information transmission. Furthermore, the optical module 1 does not perform signal modulation and/or demodulation, signal frequency change, signal filtering, or signal AD conversion, but performs only photoelectric conversion and signal amplification. However, in the above description, at least part of the processing that is not performed by the optical module 1 may be performed by the optical module 1 . Also, the optical and/or electrical signals input to and/or output from the optical module 1 may be, for example, binary digital signals or other types of signals.
- the optical module 1 has, for example, the following components.
- ⁇ Module board 5 A plurality of (four in the illustrated example) optical ICs 7 that are mounted on the module substrate 5 and perform photoelectric conversion -
- a plurality of optical connectors 11 located on the opposite side of the plurality of optical ICs 7 of the plurality of fiber bundles 9
- At least one control IC 13 one in the illustrated example) that is mounted on the module substrate 5 and controls the plurality of optical ICs 7
- An electrical connector 17 mounted on the module substrate 5 and electrically connected to an external electronic device (here, the motherboard 3) for the optical module 1;
- ⁇ Passive components 19 mounted on the module substrate 5 - A cooling
- Each fiber bundle 9 has a plurality of (four in the illustrated example) optical fibers 23 extending parallel to each other.
- each optical IC 7 is capable of inputting and/or outputting multi-channel optical signals.
- the optical module 1 is capable of inputting and/or outputting optical signals with the number of channels obtained by adding up the number of channels of the plurality of optical ICs 7 .
- a plurality of optical ICs 7 are mounted on the module substrate 5, and a control IC 13, a power supply IC 15, and an electrical connector 17 are also mounted.
- the optical module 1 is thus configured. Therefore, compared with the structure etc. which mount optical IC7 to a circuit board with a connector, size reduction is achieved. Note that the optical module 1 does not have to include the passive component 19 and the cooling component 21 .
- the ICs (7, 13, 15, etc.) are mounted on the module substrate 5
- the ICs are mounted by a conductive bonding material (not shown) such as solder (including lead-free solder). It is joined to the module substrate 5 . Therefore, for example, a mode of detachably arranged on the module substrate 5 by means of a connector is not included in the mounting here.
- the number of ICs may be counted based on the unit of direct mounting on the module substrate 5 .
- the entirety of the plurality of optical ICs 7 is not conceptually treated as one IC.
- one optical IC 7 is not regarded as a plurality of ICs.
- the module substrate 5 is, for example, a flat member.
- the front and back of the flat plate are a first mounting surface 5a and a second mounting surface 5b, respectively, on which electronic components (optical IC 7, etc.) are mounted.
- the module substrate 5 is composed of, for example, a rigid printed wiring board.
- the basic configuration (excluding the specific configuration corresponding to the arrangement of the optical IC 7, etc.) may be various configurations, for example, it may be a known configuration. do not have.
- the printed wiring board may be a double-sided board or a multilayer board on which electronic components (here, the optical IC 7, etc.) can be mounted on both sides.
- the double-sided board has a plate-like insulator and conductor layers (not shown) overlapping both sides of the insulator.
- a multilayer board has a plate-like insulator and three or more conductor layers (not shown) located on both sides and inside the insulator.
- the conductor layers may be connected to each other by, for example, solid or hollow via conductors (not shown) penetrating part or all of the thickness of the insulator.
- the conductor layers on the front and back of the insulator may be partially covered with an insulating film (solder resist).
- the printed wiring board may be a single-sided board in which a conductor layer is formed only on one side of a plate-shaped insulator.
- the material of the insulator and the material of the conductor may be appropriate.
- the insulator may be composed of organic or inorganic materials, or a combination thereof. More specifically, the insulator may be, for example, a base material such as glass cloth impregnated with a resin, or may be ceramic.
- the conductor may be a metal such as copper.
- the conductor layer may be composed entirely of the same material, or may be composed of a laminate of two or more layers partially or wholly made of different materials.
- the via conductors may be entirely made of the same material, or may be made of different materials inside and outside.
- the conductors (conductor layers and via conductors) (not shown) of the module substrate 5 may include portions that play appropriate roles.
- the conductor may have lands on which various electronic components (7, 13, 15, 17 and 19) are mounted, and wires connecting the lands.
- the land may be a pad for surface mounting or may be for through-hole mounting.
- the conductor may include a portion that constitutes an electric element.
- Electronic elements are, for example, passive elements such as resistors, inductors or capacitors.
- the planar shape and various dimensions of the module substrate 5 may be appropriately set according to the number and size of electronic components (optical ICs 7, etc.) mounted on the module substrate 5.
- the planar shape of the module substrate 5 is a rectangular shape having four sides parallel to the x-direction or the y-direction.
- the length of each side of the module substrate 5 in plan view is 30 mm or more and 50 mm or less. If the module substrate 5 is not rectangular, each side of the smallest rectangle that includes the module substrate 5 may satisfy the above range of dimensions.
- optical IC 7 The configuration of the plurality of optical ICs 7 is, for example, the same as each other. Unlike the illustrated example, the configuration of at least some of the optical ICs 7 may be different from the configuration of the other optical ICs 7 internally and/or externally. For example, some of the optical ICs 7 may transmit optical signals and the remaining optical ICs 7 may receive optical signals. Moreover, the number of channels of some optical IC7 may differ from the number of channels of other optical IC7. In addition, in description of this embodiment, for convenience, it may be expressed on the assumption that the plurality of optical ICs 7 have the same configuration.
- the optical IC 7 is generally a thin rectangular parallelepiped component (the length in the z direction is shorter than the lengths in the x and y directions).
- a fiber bundle 9 (a plurality of optical fibers 23) extends from one surface (the surface on the +x side) of the rectangular parallelepiped.
- the optical IC 7 photoelectrically converts a plurality of optical signals transmitted through a plurality of optical fibers 23 .
- the optical IC 7 may have, for example, an electronic element (described later) such as a photoelectric conversion element, and a package 7a that houses the electronic element.
- the size of the optical IC 7 (package 7a) may be appropriately set according to the number and diameter of the optical fibers 23, the number and size of the internal electronic elements, and the like.
- the configuration of the package 7a of the optical IC 7 may be various configurations except that the optical fiber 23 is extended, and may be the same as a known configuration, for example.
- the material of the sealing portion 7b of the package 7a may be ceramic or resin.
- the package 7a may be surface-mounted (example shown) or through-hole mounted.
- the terminals 7c may be pins (example shown) or pads (or bumps bonded to pads).
- the shape and number of pins are arbitrary.
- the illustrated example shows a mode in which pins as terminals extend from two side surfaces along the xz plane. In the description of the embodiments, for the sake of convenience, expressions based on this aspect may be used.
- a plurality of optical ICs 7 are mounted together on the first mounting surface 5 a of the module substrate 5 . Moreover, the plurality of optical ICs 7 are mounted so that the directions in which the fiber bundles 9 extend are the same, for example. The plurality of optical ICs 7 are mounted at different positions in a direction (y-direction) perpendicular to the direction in which the fiber bundles 9 extend, for example, so that the plurality of fiber bundles 9 do not overlap each other. In the illustrated example, the plurality of optical ICs 7 are arranged in a row in the y direction. In other words, the x-direction positions of the plurality of optical ICs 7 are the same. The array pitch is constant, for example.
- the positions of the electronic components in plan view are the same or different, for example, the position of the geometric center of the electronic components in plan view may be referred to.
- the number of optical ICs 7 may be any number of 2 or more. In the illustrated example, four optical ICs 7 are illustrated. This is only an example, and for example, the number of optical ICs 7 may be two, or may be ten or more. It does not matter if the number is odd or even.
- each optical IC 7 may be contained in one of the areas, or may span two or more areas.
- the center of each optical IC 7 may coincide with the center of the module substrate 5 in the x direction, or may be located on the +x side or the -x side.
- the center of the arrangement range in the y direction of the plurality of optical ICs 7 may coincide with the center of the module substrate in the y direction (example shown), or may be located on the +y side or the -y side.
- the pitch of the plurality of optical ICs 7 may be relatively small, and the length of the module substrate 5 in the y direction is the length of the arrangement range of the entire plurality of optical ICs 7 in the y direction. may be reduced.
- the pitch of the plurality of optical ICs 7 may be the minimum size that does not cause a short circuit between adjacent optical ICs 7 .
- the arrangement range of the entire plurality of optical ICs 7 in the y direction (for example, the minimum rectangular range including all the optical ICs 7) is 2/3 or more, 3/4 or more, or 4/4 of the length of the module substrate 5 in the y direction. /5 or more.
- the optical IC 7 may be mounted on the second mounting surface 5b. Also, there may be an optical IC 7 from which the fiber bundle 9 extends in a direction other than the +x side.
- the configurations of the plurality of fiber bundles 9 are, for example, identical to each other. Contrary to the illustrated example, the configuration of at least some fiber bundles 9 may differ from the configuration of other fiber bundles 9 .
- the number of optical fibers 23 included in some fiber bundles 9 may differ from the number of optical fibers 23 included in other fiber bundles 9 .
- the length of some fiber bundles 9 may be different from the length of the other fiber bundles 9 .
- the plurality of optical fibers 23 may be covered and bundled with a sheath, or may not be bundled.
- the drawings of the present disclosure illustrate embodiments without a sheath to better show that the fiber bundle 9 has optical fibers 23 .
- the plurality of optical fibers 23 may not be bundled, when the plurality of optical fibers 23 extend in parallel, the plurality of optical fibers 23 extend parallel to each other. does not require
- the number of optical fibers 23 included in each fiber bundle 9 may be any number of two or more. In the illustrated example, four optical fibers 23 are illustrated. This is only an example, and for example, the number of optical fibers 23 included in each fiber bundle 9 may be two, or may be ten or more. It does not matter if the number is odd or even.
- the arrangement of the optical fibers 23 in its cross section is arbitrary.
- all the optical fibers 23 are arranged in a line in one radial direction (y direction) of the optical fibers 23 at least inside the optical IC 7 and inside the optical connector 11 .
- the arrangement direction of the optical fibers 23 is, for example, the longitudinal direction of the side surface (+x side surface) of the optical IC 7, and from another viewpoint, the direction along the first mounting surface 5a of the module substrate 5.
- the optical fibers 23 may be arranged in two or more rows, or may be arranged in a manner not consistent with the concept of arrangement.
- each optical fiber 23 may be various configurations, for example, it may be a known configuration.
- the optical fiber 23 has a core and a clad that covers the core and has a higher refractive index than the core.
- the core and clad are made of translucent material (for example, quartz glass or plastic).
- the optical fiber 23 may further have a coating made of an appropriate material (for example, resin or fiber) covering the clad.
- the optical fiber 23 may be of single mode or of multimode.
- the diameter of the optical fiber 23 is arbitrary.
- the optical fiber 23 has some degree of flexibility, for example. As a result, the fiber bundle 9 has flexibility. Accordingly, the optical connector 11 can be oriented in various directions other than the orientation illustrated in the drawings. In the illustrated example, since the plurality of optical fibers 23 are arranged in the y-direction, deformation in the z-direction is relatively easy.
- the fiber bundle 9 is irremovably fixed to the optical IC 7. In other words, the fiber bundle 9 cannot be separated from the optical IC 7 unless the optical IC 7 is destroyed.
- the fiber bundle 9 and the sealing portion 7b are fixed by an adhesive or by direct contact and/or the sealing portion 7b is fixed by clamping the fiber bundle 9 .
- the optical connector 11 may be configured by fixing two or more members with screws or the like, and some or all of the members may be separable from the fiber bundle 9 .
- optical connector 11 is detachably connected to a mating connector (not shown) of an optical waveguide (not shown) outside the optical module 1 to optically connect the optical IC 7 and the external optical waveguide.
- the configurations of the plurality of optical connectors 11 are, for example, identical to each other. Unlike the illustrated example, the configuration of at least some optical connectors 11 may differ from the configuration of other optical connectors 11 .
- each optical connector 11 may be various configurations, for example, it may be a known configuration.
- the optical connector 11 and the mating connector may be positioned in the radial direction of the optical fiber 23 by inserting (fitting) one housing into the other housing, and/or a
- the optical fiber 23 may be positioned in the radial direction by inserting (fitting) the guide pin provided on the other side into the guide hole provided on the other side.
- the end face of the optical fiber 23 and the end face of the external optical waveguide may be directly opposed to each other, or may be optically connected via an optical component (for example, a lens) provided in at least one of the connectors. good.
- control IC The control IC 13 is mounted on the module substrate 5 and electrically connected to at least one optical IC 7 via conductors (wiring) of the module substrate 5 .
- the control IC 13 then inputs a control signal to at least one optical IC 7 .
- the specific operation of the optical IC 7 controlled by the control IC 13 may be various, and an example will be shown later with reference to FIG.
- the number of control ICs 13 is arbitrary. In the illustrated example, only one control IC 13 is provided, and one control IC 13 controls all the optical ICs 7 . Unlike the illustrated example, for example, the same number of control ICs 13 as the plurality of optical ICs 7 may be provided, and one control IC 13 may control only one optical IC 7 . Further, for example, even if the number of control ICs 13 that is two or more and is smaller than the number of the plurality of optical ICs 7 is provided, or the number of control ICs 13 that is larger than the number of the plurality of optical ICs 7 is provided, good.
- the number of optical ICs 7 to be controlled may differ among the control ICs 13 , or two or more control ICs 13 may perform mutually different controls for one optical IC 7 .
- the optical module 1 may have at least one control IC 13 that controls at least one optical IC 7 .
- the configurations of the plurality of control ICs 13 are identical to each other in terms of internal configuration and/or external configuration. There may be, or they may be different from each other.
- the configuration of the control IC 13 may be various configurations, and for example, it may be a publicly known configuration except for specific configurations corresponding to the contents of processing or the like.
- the description of the package 7a of the optical IC 7 described above may be applied to the package (reference numerals omitted) of the control IC 13 as long as there is no contradiction. Since the fiber bundle 9 does not protrude from the control IC 13 unlike the optical IC 7, pin-like terminals (reference numerals omitted) may be provided on four side surfaces of the control IC 13, unlike the illustrated example.
- the position where the control IC 13 is mounted is arbitrary.
- the control IC 13 is mounted on the first mounting surface 5a.
- the control IC 13 is mounted on the same mounting surface as the mounting surface on which the plurality of optical ICs 7 are mounted.
- one or more control ICs 13 may be mounted on the second mounting surface 5b.
- the plurality of control ICs 13 may be dispersedly mounted on the first mounting surface 5a and the second mounting surface 5b.
- the power supply IC 15 is mounted on the module substrate 5 and electrically connected to at least one optical IC 7 via conductors (wiring) of the module substrate 5 .
- the power supply IC 15 supplies power to at least one optical IC 7 .
- the number of power supply ICs 15 is arbitrary. In the illustrated example, only one power supply IC 15 is provided, and the one power supply IC 15 supplies power to all the optical ICs 7 . Unlike the illustrated example, for example, the same number of power supply ICs 15 as the plurality of optical ICs 7 may be provided, and one power supply IC 15 may supply power to only one optical IC 7 . Further, for example, even if the number of power supply ICs 15 that is two or more and is smaller than the number of the plurality of optical ICs 7 is provided, or the number of power supply ICs 15 that is larger than the number of the plurality of optical ICs 7 is provided, good.
- the power supply ICs 15 may have different numbers of optical ICs 7 to which power is supplied, or two or more power supply ICs 15 may supply different powers to one optical IC 7 .
- the optical module 1 may have at least one power supply IC 15 that supplies power to at least one optical IC 7 .
- the configurations of the plurality of power supply ICs 15 are identical to each other in terms of internal configuration and/or external configuration. There may be, or they may be different from each other.
- the configuration of the power supply IC 15 may be various configurations, and for example, it may be a known configuration except for a specific configuration corresponding to the content of the role or the like.
- the description of the package 7a of the optical IC 7 described above may be applied to the package (reference numerals omitted) of the power supply IC 15 as long as there is no contradiction.
- the power supply IC 15 does not extend the fiber bundle 9, so unlike the illustrated example, pin-shaped terminals (reference numerals omitted) may be provided on four side surfaces.
- the power supply IC 15 may be configured as, for example, a DC (Direct Current)/DC converter.
- the power supply IC 15 converts DC power supplied from the outside (motherboard 3 ) through the electrical connector 17 into DC power of an appropriate voltage or current, and supplies the DC power to the optical IC 7 .
- the power supply IC 15 may be a constant voltage power supply or a constant current power supply.
- the power supply IC 15 may be capable of supplying a plurality of types of power with different voltages or currents, or may be capable of supplying one type of power.
- the power supply IC 15 may be a converter other than the DC/DC converter.
- the power supply IC 15 may or may not contribute to power supply to the control IC 13 . Different from the illustrated example, another power supply IC may be interposed between the electrical connector 17 and the power supply IC 15 .
- the position where the power supply IC 15 is mounted is arbitrary.
- the power supply IC 15 is mounted on the first mounting surface 5a.
- the power supply IC 15 is mounted on the same mounting surface as the plurality of optical ICs 7 are mounted.
- one or more power supply ICs 15 may be mounted on the second mounting surface 5b (the surface on which the optical IC 7 is not mounted).
- the plurality of power supply ICs 15 may be dispersedly mounted on the first mounting surface 5a and the second mounting surface 5b.
- the electrical connector 17 is detachably connected to a mating connector (not shown) of the motherboard 3 (or a cable that mediates the motherboard 3 and the optical module 1) to electrically connect the module substrate 5 and the motherboard 3. connect to.
- the electrical connector 17 (from another point of view, the motherboard 3 connected to the electrical connector 17) is electrically connected to electronic components mounted on the module substrate 5 via conductors (wiring) of the module substrate 5. It is connected.
- the electrical connector 17 is connected to the optical IC 7, the control IC 13 and the power supply IC 15 directly or indirectly via other electronic elements.
- Other electronic elements are, for example, active elements or passive elements mounted on the module substrate 5 or passive elements constituted by conductors of the module substrate 5 .
- the number of electrical connectors 17 is arbitrary. In the illustrated example, only one electrical connector 17 is provided. Unlike the illustrated example, in a mode in which two or more electrical connectors 17 are provided, the two or more electrical connectors 17 may be connected to the same device (here, motherboard 3), or may be connected to different devices. may be connected to
- the position where the electrical connector 17 is mounted is arbitrary.
- the electrical connector 17 is mounted on the second mounting surface 5b (the surface on which the optical IC 7 is not mounted) and fits with the connector of the mating device in the z-direction.
- one or more electrical connectors 17 may be mounted on the first mounting surface 5a (the surface on which the optical IC 7 is mounted), or may be arranged on the edge of the module substrate 5.
- the electrical connector of the mating device may be fitted in the direction along the module substrate 5 .
- the plurality of electrical connectors 17 may be dispersedly mounted on the first mounting surface 5a and the second mounting surface 5b.
- each electrical connector 17 may be various configurations, for example, may be a known configuration.
- the electrical connector 17 and the mating connector may be positioned relative to each other by inserting (fitting) one housing into the other, and/or may be positioned relative to each other by contact between terminals.
- the electrical connector 17 and the mating connector may be electrically connected to each other by inserting a plurality of pin-shaped terminals of one connector into a plurality of tubular terminals of the other connector, or may be electrically connected to each other.
- a plurality of layered terminals formed on the surface of the substrate of one connector may be electrically connected to each other by coming into contact with leaf spring-like terminals provided in the concave portion of the other connector.
- Passive components 19 are, for example, resistors, capacitive elements or inductors.
- One passive component 19 may be interposed between any two of the electrical connector 17, the optical IC 7, the control IC 13, and the power supply IC 15 to contribute to impedance matching, for example.
- the number, function (resistor, capacitive element, inductor, etc.), shape (chip type, etc.), size, mounting method (surface mounting, through-hole mounting, etc.), mounting position, etc. of the passive components 19 are arbitrary.
- the cooling component 21 (heat sink) is made of a material with high heat conductivity. Also, the cooling component 21 is thermally connected to at least one of the module substrate 5 and the electronic components mounted on the module substrate 5, either directly or via another material (for example, grease). Thereby, the cooling component 21 contributes to improving the heat dissipation of the optical module 1 .
- Materials with high thermal conductivity include, for example, metals (eg, aluminum).
- the cooling component 21 may, for example, be integrally formed entirely of the same material.
- the cooling component 21 is arranged, for example, on the first mounting surface 5a side with respect to the module substrate 5 . Although not particularly shown, a cooling component arranged on the second mounting surface 5b side with respect to the module substrate 5 may be provided in place of or in addition to the cooling component 21 .
- the cooling component 21 may have a plurality of fins 21d.
- the plurality of fins 21d increase the surface area of the cooling component 21 and improve heat dissipation.
- a plurality of fins 21d protrude to the +z side (the side opposite to the first mounting surface 5a with respect to the cooling component 21) and extend along the first mounting surface 5a.
- the thickness (the length in the y direction in the illustrated example), the height (the length in the z direction), the length of extension (the length in the x direction in the illustrated example), and the direction of extension (from the x direction) of the plurality of fins 21d y-direction, etc.), pitch and number, etc. are arbitrary.
- a plurality of pins projecting to the +z side and two-dimensionally arranged on the xy plane may be provided.
- the cooling component 21 is configured to function also as a housing that protects the electronic components (7, 13, 15, etc.) mounted on the first mounting surface 5a.
- the cooling component 21 has a concave portion 21a formed on the surface facing the first mounting surface 5a.
- the cooling component 21 has an annular wall portion (from another point of view, four wall portions 21b along four sides) extending along the edges of the surface facing the first mounting surface 5a.
- the cooling component 21 is arranged on the first mounting surface 5a such that the top surfaces (surfaces on the -z side) of the four walls 21b abut against the first mounting surface 5a.
- An electronic component mounted on the first mounting surface 5a is accommodated in the recess 21a.
- a notch 21c is formed in the wall portion 21b on the +x side so as to lower the height of the wall portion 21b. This allows the fiber bundle 9 to extend outside the cooling component 21 .
- a plurality of cutouts 21c are formed, and one cutout 21c allows one fiber bundle 9 to extend.
- the number of notches 21c may be one or a plurality smaller than the number of fiber bundles 9, and one notch 21c may allow two or more fiber bundles 9 to extend.
- the shape and dimensions of the notch 21c are arbitrary. For example, the depth (length in the z direction) of the notch 21c may be smaller than the height (length in the z direction) of the wall portion 21b (example shown), or may be the same.
- the cooling component 21 contributes to the contact of the surface facing the first mounting surface 5a with the first mounting surface 5a and/or the electronic component mounted on the first mounting surface 5a (for example, the surface on the +z side thereof). It may have a convex portion 25 (25A to 25D).
- the wall portion 21 b may be regarded as an example of the convex portion 25 .
- the convex portion 25 may be provided even in a mode in which the cooling component 21 does not function as a housing.
- the shape and size of the convex portion 25 are arbitrary.
- the protrusion 25 is provided for each IC, but one protrusion 25 corresponds to two or more ICs (which may be of the same type or of different types). You can come in contact with me.
- the contact area between one protrusion 25 and one IC may or may not occupy most of the area (e.g., 80% or more) of the top surface of the IC (surface on the +z side).
- the convex portions 25B and 25C are in contact with most of the top surfaces of the control IC 13 and power supply IC 15 .
- the convex portion 25A is in contact with the top surface of the optical IC 7 within a range that overlaps with the processing portion 29 (see FIG. 3 described later) and does not overlap with the converting portion 27 (see FIG. 3 described later) in planar see-through. is 30% or more and less than 80% of the area of the top surface of the optical IC 7 .
- the convex portion 25D may not be provided, or conversely, may be provided over a wider range than the illustrated example.
- the cooling component 21 may be in direct contact with the object to be cooled (the first mounting surface 5a or the electronic component), or may be in indirect contact with the object to be cooled via another material.
- Other materials include, for example, grease.
- Other materials include a highly heat-conductive and elastic sheet that is attached to the convex portion 25 and/or the object to be cooled. Note that the sheet attached to the convex portion 25 may be regarded as part of the convex portion 25 .
- the grease and/or sheet may be arranged without providing the protrusion 25 to achieve thermal connection between the cooling component 21 and the object to be cooled. In this case, the contact object, contact area, etc. of the convex portion 25 described above may be used for the contact object, contact area, etc. of the grease and/or the sheet.
- the fixing of the cooling component 21 to the module substrate 5 may be done by an appropriate method. For example, they may be fixed by screws (not shown) (nuts if necessary) or by engaging claws.
- FIG. 3 is a block diagram showing an example of the configuration of the signal processing system of the optical module 1. As shown in FIG. Here, one optical IC 7, one control IC 13 and one power supply IC 15 are shown.
- the optical IC 7 has, for example, a conversion section 27 that directly performs photoelectric conversion, a processing section 29 that processes electrical signals related to the conversion section 27, and a sensor 31 that detects temperature.
- the conversion unit 27 has, for example, the same number of photoelectric conversion elements 33 as the number of channels (the number of optical fibers 23 connected to one optical IC 7).
- the photoelectric conversion element 33 is, for example, a laser diode for optical signal transmission or a photodiode for optical signal reception.
- the laser diode generates an optical signal corresponding to the electrical signal input from the processing unit 29 and outputs the optical signal to the optical fiber 23 .
- the photodiode generates an electrical signal corresponding to the optical signal input from the optical fiber 23 and outputs the electrical signal to the processing section 29 .
- the processing unit 29 has, for example, the same number of individual circuits 35 as the number of channels.
- the plurality of individual circuits 35 are individually (one-to-one) connected to the plurality of photoelectric conversion elements 33 .
- the individual circuit 35 is a drive circuit for optical signal transmission or an amplifier circuit for optical signal reception.
- the drive circuit outputs an electrical signal to the photoelectric conversion element 33 according to the electrical signal input from the outside of the optical module 1 through the electrical connector 17 .
- the amplifier circuit amplifies the electrical signal input from the photoelectric conversion element 33 and outputs it to the outside of the optical module 1 via the electrical connector 17 .
- the plurality of photoelectric conversion elements 33 may be manufactured as elements separated from each other and mounted on the same substrate, or may be manufactured on the same substrate.
- the plurality of individual circuits 35 may be fabricated as IC chips separated from each other and mounted on the same substrate, or may be fabricated in one IC chip.
- the conversion unit 27 and the processing unit 29 may be fabricated as separate chips and mounted on the same substrate, or may be fabricated on the same chip. The same applies to the sensor 31 as well.
- the positional relationship between the conversion unit 27 and the processing unit 29 when seen through a plane is also arbitrary.
- the conversion unit 27 may be located on the side where the fiber bundle 9 extends from the optical IC 7 (+x side in FIG. 1) with respect to the processing unit 29 .
- the cooling component 21 may directly or indirectly contact the top surface of the optical IC 7 within a range that overlaps the processing section 29 but does not overlap the conversion section 27 when seen from above.
- the cooling component 21 may abut on the top surface of the optical IC 7 in the range overlapping the conversion section 27 .
- the sensor 31 outputs an electrical signal corresponding to the temperature to the control IC 13.
- the control IC 13 controls the individual circuit 35 based on the temperature detected by the sensor 31 so as to compensate for characteristic changes in the photoelectric conversion elements 33 caused by temperature changes, for example. Specifically, for example, the individual circuit 35 biases the anode or cathode of the photoelectric conversion element 33 with a voltage or current corresponding to the value stored in its own register.
- the control IC 13 rewrites the value stored in the register according to the detection value of the sensor 31 . This reduces temperature-induced changes in the relative relationship between the intensity of the optical signal and the intensity of the electrical signal.
- the configuration, number and position of the sensors 31 are arbitrary.
- the sensor 31 is composed of a thermistor or a resistance temperature detector, and changes electrical resistance according to temperature.
- the sensor 31 may have only a transducer, or may have a circuit for performing predetermined processing (for example, amplification) in addition to the transducer. Further, only one sensor 31 may be provided in one optical IC 7 (example shown), or a plurality of sensors 31 may be individually provided in a plurality of photoelectric conversion elements 33 .
- a plurality of sensors 31 are provided in a number smaller than the number of photoelectric conversion elements 33, and the detection value of the nearest sensor 31 is used for each photoelectric conversion element 33, or the representative value of the detection values is used. good too.
- the example of the above processing may be modified as appropriate.
- the plurality of individual circuits 35 individually applied the bias to the plurality of photoelectric conversion elements 33 .
- one circuit that applies a common bias to the plurality of photoelectric conversion elements 33 may be provided.
- the control IC 13 may generate the bias instead of the processing unit 29 in the optical IC 7 generating the bias.
- control IC 13 is not interposed between the electrical connector 17 and the optical IC 7 in the illustrated example. In other words, the control IC 13 does not have the function of transmitting the electrical signal converted into the optical signal and/or the electrical signal converted from the optical signal. However, the control IC 13 may have such functions. Also, the control IC 13 may have other functions such as a function of monitoring the current applied to the photoelectric conversion element 33 .
- the optical module 1 includes the module substrate 5, multiple optical ICs 7, multiple fiber bundles 9, multiple optical connectors 11, at least one control IC 13, and at least one power supply IC 15.
- the module substrate 5 has a first surface (first mounting surface 5a) extending in a first direction (y direction) and a second direction (x direction) orthogonal to the first direction.
- the plurality of optical ICs 7 are mounted on the first mounting surface 5a at different positions in the y direction, and perform photoelectric conversion.
- the plurality of fiber bundles 9 each have a plurality of optical fibers 23 extending parallel to each other, and extend from the plurality of optical ICs 7 toward the first side (+x side) in the second direction.
- the plurality of optical connectors 11 are located at the ends of the plurality of fiber bundles 9 opposite to the plurality of optical ICs 7, and are connected to external optical elements (for example, optical waveguides (not shown)) so as to be capable of transmitting optical signals. be done.
- At least one control IC 13 is mounted on the module substrate 5 and controls at least one of the plurality of optical ICs 7 .
- At least one power supply IC 15 is mounted on the module substrate 5 and supplies power to at least one of the plurality of optical ICs 7 .
- the transmission band can be expanded.
- a plurality of optical ICs 7, control ICs 13, and power supply ICs 15 are all mounted on the module substrate 5 to form a module, miniaturization is achieved.
- the at least one control IC 13 may include only one control IC 13.
- One control IC 13 may control a plurality of (all) optical ICs 7 .
- the module substrate 5 can be miniaturized compared to a mode in which the same number of control ICs 13 as the plurality of optical ICs 7 are provided (this mode is also included in the technology according to the present disclosure). This is because, for example, packages are shared to reduce the volume occupied by the packages, and the gaps between packages for preventing short circuits between packages are eliminated.
- the at least one power supply IC 15 may include only one power supply IC.
- One power supply IC 15 may supply power to a plurality of optical ICs 7 .
- the module board 5 can be miniaturized in the same manner as in the case where only one control IC 13 is provided.
- the optical module 1 is in direct or indirect contact with the plurality of optical ICs 7 and the module substrate 5 and may further have a cooling component 21 for cooling them.
- the cooling component 21 covering a wide range covering the module substrate 5 dissipates heat from the plurality of optical ICs 7, and stable optical communication can be performed. Further, for example, by being in contact with both the plurality of optical ICs 7 and the module substrate 5, the temperature difference between the two can be reduced and the transitional period of temperature change can be shortened. As a result, for example, it is possible to reduce the possibility that the optical communication becomes unstable when the device including the optical module 1 is activated.
- FIG. 4A and 4B are schematic plan views showing another example and still another example of the arrangement of a plurality of optical ICs 7.
- FIG. 7 show an optical module 1A according to another example and an optical module 1B according to yet another example.
- At least one optical IC 7 is displaced in the x direction from one (one side) or two (both sides) optical ICs 7 adjacent in the y direction.
- the distance in the y direction can be reduced between the optical ICs 7 adjacent to each other in the order of arrangement in the y direction.
- adjacent optical ICs 7 can partially overlap the arrangement ranges in the y direction.
- the arrangement range in the y direction of the entire plurality of optical ICs 7 can be reduced.
- the interval (in the y direction) between adjacent optical ICs 7 for reducing the probability of short circuits is dead space, but such space can be reduced. As a result, miniaturization of the module substrate 5 is facilitated.
- a specific aspect of shifting the positions of the plurality of optical ICs 7 in the x direction as described above may be set as appropriate. For example, all of the optical ICs 7 may be shifted from the adjacent optical ICs 7 (FIG. 4B), or some of the optical ICs 7 may be shifted from the adjacent optical ICs 7 (FIG. 4A).
- the plurality of optical ICs 7 are shifted one by one to the opposite side.
- the plurality of optical ICs 7 are shifted one by one to the same side.
- the two or more optical ICs 7 are displaced to the same side one by one, the two or more optical ICs 7 are displaced one by one to the side opposite to the same side (furthermore, the above two types of displacement are repeated). mentioned.
- two or more (two in the illustrated example) optical ICs 7 on the central side and two or more (two in the illustrated example) optical ICs 7 on both sides are misaligned.
- two or more optical ICs 7 on one side in the y direction and at least one optical IC 7 on the other side in the y direction are arranged in the x direction.
- a mode of deviation is mentioned.
- the two optical ICs 7 arranged next to each other in the y-direction and displaced in the x-direction may overlap each other in the arrangement range in the y-direction as shown in the figure. region R1 may be formed), and unlike the illustrated example, they do not have to overlap each other. Even in the latter case, compared to the mode of FIG. 1, it is easier to reduce the arrangement range in the y direction of the entire plurality of optical ICs 7 .
- the pin-shaped terminals 7c may overlap each other (example shown in the figure), or the sealing portions 7b may overlap each other.
- the overlapping of the sealing portions 7b is based on the overlapping of the pin-shaped terminals 7c.
- the terminals 7c may be, for example, pins for through-hole mounting or pads or bumps for surface mounting. It does not have to be the premise of The size of the overlapping region R1 in the y direction is arbitrary.
- the two optical ICs 7 that form the overlapping region R1 and are displaced from each other in the x direction do not overlap each other in the arrangement range in the x direction, for example.
- the distance between the two in the x direction is arbitrary. It is also possible to overlap the arrangement ranges in the x direction between the two optical ICs 7 forming the overlapping region R1.
- the terminal 7c is a pin for surface mounting
- the terminal 7c closest to the +x side and the side surface of the sealing portion 7b on the +x side are separated by a predetermined distance.
- the arrangement ranges in the x direction may overlap each other by a length shorter than the above distance.
- the fiber bundle 9 extending from the optical IC 7 located on the -x side may extend so as not to overlap the optical IC 7 located on the +x side (illustration example), they may extend so as to partially overlap in the y direction. In the former case, the fiber bundle 9 may or may not be in contact with the optical IC 7 on the +x side in the y direction.
- the fiber bundle 9 extending from the optical IC 7 on the ⁇ x side overlaps the optical IC 7 on the +x side
- the fiber bundle 9 extending from the optical IC 7 on the ⁇ x side and the light on the +x side do not overlap each other.
- optical ICs 7 adjacent to each other in the y direction may have different external configurations, it may be rationally determined whether or not they are displaced from each other in the x direction.
- the geometric centers of the sealing portion 7b may be compared to determine whether or not they are shifted from each other.
- At least one of the plurality of optical ICs 7 includes one or two adjacent optical ICs 7 arranged in the first direction (y direction) and the second direction (x direction, the fiber bundle 9 The direction extending from the optical IC 7) may be misaligned.
- the optical IC 7 located on the +x side (the side where the fiber bundle 9 extends) of the adjacent optical IC 7 in the y direction restricts movement in the y direction of the fiber bundle 9 extending from the adjacent optical IC 7. It can function as a member for Therefore, not only can the size be easily reduced, but the optical IC 7 can also be used as a positioning member for the fiber bundle 9 . Also from this point of view, the size of the module substrate 5 can be reduced.
- the at least one optical IC 7 does not overlap the adjacent one or two optical ICs 7 in the arrangement range in the second direction (x direction) and is arranged in the first direction (y direction). Some of the ranges may overlap.
- the effect of reducing the arrangement range in the y direction of the entire plurality of optical ICs 7 is improved.
- the effect of facilitating miniaturization of the module substrate 5 is improved.
- FIG. 5 is a schematic plan view showing another example of the power supply IC 15. As shown in FIG. In other words, FIG. 5 shows an optical module 1C according to another example.
- the optical module 1C is an example of such a mode.
- a plurality of (three in the illustrated example) power supply ICs 15 (15A, 15B, and 15C) can supply power of different voltages (or currents), for example.
- each power supply IC 15 supplies power to a plurality of (for example, all) optical ICs 7 as indicated by dotted lines.
- Each optical IC 7 uses, for example, a plurality of types of power supplied from a plurality of power supply ICs 15A to 15C for different purposes.
- the optical IC 7 distributes a plurality of types of power to at least two or more of an internal core logic circuit, an I/O (input/output) circuit, an auxiliary logic circuit, a circuit that applies voltage to the photoelectric conversion element 33, and memory. you can
- the number of power types (in the illustrated example, the number of power supply ICs 15) is arbitrary. As described in the description of the embodiment, the mounting positions of the plurality of power supply ICs 15 are arbitrary.
- the layout of FIG. 4A is taken as an example of the layout of the optical ICs 7, but it is obvious that other layouts may be used.
- At least one power supply IC 15 may include two or more power supply ICs 15. Two or more power supply ICs 15 may supply power with different voltages. Each power supply IC 15 may supply power to a plurality of optical ICs 7 .
- each power supply IC 15 is shared by a plurality of optical ICs 7 . Therefore, it is possible to reduce the size of the optical module 1C compared to a mode (this mode is also included in the technology according to the present disclosure) in which the power supply IC 15 is provided for each optical IC 7 and for each voltage. Moreover, compared with the optical module 1 (FIG. 1) having only one power supply IC 15, for example, the configuration of the power supply IC 15 can be simplified, and the cost can be reduced.
- the optical ICs 7 may have different positions in the x direction (the direction in which the fiber bundle 9 extends).
- the lengths of the plurality of fiber bundles 9 are the same, the lengths of the plurality of fiber bundles 9 extending from the +x side end of the module substrate 5 are different from each other.
- the positions of the plurality of optical connectors 11 are different from each other. This difference may cause inconvenience depending on the configuration of equipment to which the plurality of optical connectors 11 are connected.
- a regulating member is provided for aligning the lengths of the plurality of fiber bundles 9 extending from the +x side end of the module substrate 5 .
- the cooling component is also used as the regulating member. Specifically, it is as follows.
- FIG. 6 is an exploded perspective view showing part of an optical module 1D according to another example.
- 7A is a cross-sectional view taken along line VIIa-VIIa of FIG. 6.
- FIG. 7B is a cross-sectional view taken along line VIIb-VIIb of FIG. 6.
- FIG. 7C is a side view of the optical module 1D viewed from the +x side (wherein the cross section of the fiber bundle 9 is shown).
- the arrangement shown in FIG. 4A is taken as an example of the arrangement of the plurality of optical ICs 7 .
- the arrangement of the plurality of optical ICs 7 may be another arrangement.
- the cooling component 121 included in the optical module 1D may have a plurality of fins 21d (or a plurality of pins) and convex portions 25, like the cooling component 21. FIG. However, illustration of such a part is omitted here.
- the fiber bundle 9 extending from the optical IC 7 located relatively on the -x side may be referred to as the first fiber bundle 9A.
- the fiber bundle 9 extending from the optical IC 7 located relatively on the +x side is sometimes called a second fiber bundle 9B.
- the optical connector 11 provided on the first fiber bundle 9A may be called a first optical connector 11A.
- the optical connector 11 provided on the second fiber bundle 9B may be called a second optical connector 11B.
- the first fiber bundle 9A extends substantially linearly from the optical IC 7 and reaches the end of the module substrate 5 on the +x side.
- the second fiber bundle 9B is bent in the middle and reaches the +x-side end of the module substrate 5 (in plan view). That is, the second fiber bundle 9B has a larger deviation from the linear shape than the first fiber bundle 9A, and the difference in length from the optical IC 7 to the end of the module substrate 5 is , is smaller than the difference in position in the x direction of the optical IC 7 to which both are connected (the position of the +x side side face).
- the difference in the path of the fiber bundle 9 as described above may be realized by bending in any direction, and in the illustrated example is realized by bending in the z-direction. Moreover, the number of bending times is also arbitrary.
- the cooling element 121 may define the path of the fiber bundle 9 in any number of positions. In the illustrated example, the first fiber bundle 9A extends linearly, but the first fiber bundle 9A may also be bent at an appropriate position. In another aspect, the cooling component 121 may define only the length over which the second fiber bundle 9B extends from the module substrate 5, and in addition the length over which the first fiber bundle 9A extends from the module substrate 5. may be specified.
- cooling component 121 may define (regulate) at least part of the path of at least part of the fiber bundle 9 .
- the cooling component 121 may define (regulate) at least part of the path of at least part of the fiber bundle 9 .
- the cooling component 121 has four wall portions 121b. Notches (121ca and 121cb) for extending the fiber bundle 9 to the outside of the cooling component 121 are formed in the wall portion 121b on the +x side.
- the notch 121cb corresponding to the second fiber bundle 9B cuts the wall portion 121b deeper (longer in the z direction) than the notch 121ca corresponding to the first fiber bundle 9A.
- the optical module 1D also has an auxiliary member 37 fixed to the module substrate 5. As shown in FIG.
- the auxiliary member 37 has a protrusion 37a that protrudes from the first mounting surface 5a of the module substrate 5 toward the +z side and is inserted into a portion of the notch 121cb on the ⁇ z side.
- the cooling component 121 when the cooling component 121 is attached to the module substrate 5, as shown in FIG. 7C, an opening for passing the first fiber bundle 9A is formed at the height of the first mounting surface 5a and the second fiber bundle 9B is formed. is formed on the +z side of the former opening. Both openings are, for example, of the same shape and size.
- the auxiliary member 37 may be regarded as a part of the cooling component 121 or may be regarded as a member separate from the cooling component 121 . In the following, for the sake of convenience, expressions based on the latter way of understanding will be used. In any case, the cooling component 121 functions as a regulating member that regulates the path of the fiber bundle 9.
- FIG. 7C an opening for passing the first fiber bundle 9A is formed at the height of the first mounting surface 5a and the second fiber bundle 9B is formed. is formed on the +z side of the former opening. Both openings are, for example, of the same shape and size.
- the auxiliary member 37 may be regarded as a part
- the cooling component 121 has a convex portion 121f that protrudes toward the -z side from the surface facing the first mounting surface 5a.
- the convex portion 121f abuts on the portion of the second fiber bundle 9B extending from the optical IC 7 to the notch 121cb from the +z side to regulate the path. Therefore, the second fiber bundle 9B bends to the +z side at the position of the convex portion 121f and extends into the notch 121cb.
- the second optical connector 11B is moved to the +x side as much as possible.
- the x-direction position of the first optical connector 11A and the x-direction position of the second optical connector 11B may, for example, substantially match.
- the difference between the two may be 1/3 or less or 1/5 or less of the x-direction positional difference between the optical IC 7 on the ⁇ x side and the optical IC 7 on the +x side.
- a state is assumed in which each of the first optical connector 11A and the second optical connector 11B is positioned on the +x side as much as possible. That is, unlike FIG. 7B, the second fiber bundle 9B is assumed to extend parallel to the x-direction from the opening position defined by the notch 121cb. At this time, the difference between the x-direction position of the first optical connector 11A and the x-direction position of the second optical connector 11B is, for example, the x-direction positions of the optical IC 7 on the -x side and the optical IC 7 on the +x side. less than the difference.
- the length of the fiber bundle 9 extending from the +x side end of the module substrate 5 in the state assumed here is an example of the extension length described later.
- the positions in the z direction when the first fiber bundle 9A and the second fiber bundle 9B extend from the +x side end of the module substrate 5 may be the same for the first fiber bundle 9A and the second fiber bundle 9B. That is, while the cutouts 121ca and 121cb have the same shape and size, the -z side surface of the cooling component 21 and/or the first mounting surface 5a are appropriately formed with convex portions to form the second fiber bundle 9B. The length extending from the +x side end of the module substrate 5 may be adjusted.
- FIGS. 8A and 8B are diagrams corresponding to FIGS. 7A and 7B showing still another example.
- the notch through which the first fiber bundle 9A and the second fiber bundle 9B pass is the notch 121ca shown in FIG. That is, the first fiber bundle 9A and the second fiber bundle 9B pass through apertures of the same height.
- a stopper 39 is provided on each of the first fiber bundle 9A and the second fiber bundle 9B. The length of the fiber bundle 9 from the optical connector 11 to the stopper 39 is the same between the first fiber bundle 9A and the second fiber bundle 9B. The position of the stopper 39 in the x direction is regulated by the opening formed by the notch 121ca. Cooling element 121 may define part of the path of fiber bundle 9 in this manner.
- the optical module 1D may have defining members (the cooling component 121 and the auxiliary member 37) that define at least a part of the path of at least one of the plurality of fiber bundles 9.
- the plurality of optical ICs 7 includes a first optical IC (optical IC 7 on the -x side) and a second optical IC positioned on the first side (the side where the fiber bundle 9 extends, the +x side) of the first optical IC. (Optical IC 7 on the +x side).
- the plurality of fiber bundles 9 may have a first fiber bundle 9A extending from the optical IC 7 on the -x side and a second fiber bundle 9B extending from the optical IC 7 on the +x side.
- the length of each fiber bundle 9 from the corresponding optical IC 7 to the corresponding optical connector 11 is called the total length.
- the length of each fiber bundle 9 that can extend from the +x side end of the module substrate 5 to the +x side in parallel with the first direction (x direction) is referred to as extension length.
- the first fiber bundle 9A and the second fiber bundle 9B may have the same total length as each other.
- the regulation member (cooling component 121 and auxiliary member 37) is such that the difference between the extension length of the first fiber bundle 9A and the extension length of the second fiber bundle 9B is the optical IC 7 on the -x side and the optical IC 7 on the +x side. At least a portion of the second fiber bundle 9B may be routed so as to be smaller than the positional difference in the x-direction of .
- the difference in the positions of the optical connectors 11 can be reduced, improving convenience. do.
- the need to make the lengths of the plurality of fiber bundles 9 different from each other in order to make the positions of the optical connectors 11 the same is reduced. be done.
- the configurations of the plurality of fiber bundles 9 and the like can be made the same, and productivity can be improved.
- the defining member as described above is in contact with the plurality of optical ICs 7 and may cool the plurality of optical ICs 7 . That is, at least part of the regulation member may be configured by the cooling component 121 .
- the cooling component 121 also as a regulation member, the simplification of the optical module 1D is achieved, and thus the miniaturization is achieved.
- the optical IC not only the fiber bundle but also wiring for transmitting electrical signals may extend.
- separate connectors may be provided for the fiber bundle and the wiring, or a common connector may be provided.
- the optical connector may double as an electrical connector.
- the cooling component may be a Peltier element instead of a heat sink.
- a different concept can be extracted from this disclosure than the concept of mounting a plurality of optical ICs, at least one control IC, at least one power supply IC and an electrical connector together on a module substrate.
- the technique of shifting the positions of a plurality of optical ICs in the second direction or adjusting the length of a plurality of fiber bundles with a cooling component is implemented by mounting a control IC and a power supply IC on a module substrate together with the optical ICs. This requirement does not have to be assumed.
- SYMBOLS 1 Optical module, 3... Mother board (external electronic device), 5... Module board, 5a... First mounting surface (first surface), 7... Optical IC, 9... Fiber bundle, 11... Optical connector, 13... Control IC, 15... power supply IC, 17... electric connector, 23... optical fiber.
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Abstract
Description
図1は、本開示の実施形態に係る光モジュール1を+z側から見た分解斜視図である。図2は、光モジュール1を-z側から見た分解斜視図である。
・モジュール基板5
・モジュール基板5に実装されており、光電変換を行う複数(図示の例では4つ)の光IC7
・複数の光IC7から延び出ている複数(光IC7と同数)のファイバ束9
・複数のファイバ束9の複数の光IC7とは反対側に位置している複数(ファイバ束9と同数)の光コネクタ11
・モジュール基板5に実装されており、複数の光IC7を制御する少なくとも1つ(図示の例では1つ)の制御IC13
・モジュール基板5に実装されており、複数の光IC7に電力を供給する少なくとも1つ(図示の例では1つ)の電源IC15
・モジュール基板5に実装されており、光モジュール1にとっての外部の電子デバイス(ここではマザーボード3)と電気的に接続される電気コネクタ17
・モジュール基板5に実装されている受動部品19
・複数の光IC7の冷却に寄与する冷却部品21(図示の例ではヒートシンク)
モジュール基板5は、例えば、平板状の部材である。平板の表裏は、それぞれ電子部品(光IC7等)が実装される第1実装面5a及び第2実装面5bとなっている。モジュール基板5は、例えば、リジッド式のプリント配線板によって構成されている。リジッド式のプリント配線板において、基本的な構成(光IC7等の配置に応じた具体的な構成を除いた構成)は、種々の構成とされてよく、例えば、公知の構成とされても構わない。
複数の光IC7の構成は、例えば、互いに同一である。図示の例とは異なり、少なくとも一部の光IC7の構成は、内部の構成的に、及び/又は外部に現れる構成的に、他の光IC7の構成と異なっていてもよい。例えば、一部の光IC7は、光信号を送信するものとされ、残りの光IC7は、光信号を受信するものとされてもよい。また、一部の光IC7のチャンネル数は、他の光IC7のチャンネル数と異なっていてもよい。なお、本実施形態の説明では、便宜上、複数の光IC7が互いに同一の構成である態様を前提とした表現をすることがある。
複数のファイバ束9の構成は、例えば、互いに同一である。図示の例とは異なり、少なくとも一部のファイバ束9の構成は、他のファイバ束9の構成と異なっていてもよい。例えば、一部のファイバ束9が含む光ファイバ23の数は、他のファイバ束9が含む光ファイバ23の数と異なっていてもよい。また、例えば、一部のファイバ束9の長さは、他のファイバ束9の長さと異なっていてもよい。
光コネクタ11は、光モジュール1の外部の光導波路(不図示)が有している相手コネクタ(不図示)に取り外し可能に接続されて、光IC7と外部の光導波路とを光学的に接続する。複数の光コネクタ11の構成は、例えば、互いに同一である。図示の例とは異なり、少なくとも一部の光コネクタ11の構成は、他の光コネクタ11の構成と異なっていてもよい。
制御IC13は、モジュール基板5に実装され、モジュール基板5の導体(配線)を介して少なくとも1つの光IC7と電気的に接続される。そして、制御IC13は、少なくとも1つの光IC7に制御信号を入力する。制御IC13が制御する光IC7の具体的な動作は種々のものとされてよく、後に図3を参照して一例を示す。
電源IC15は、モジュール基板5に実装され、モジュール基板5の導体(配線)を介して少なくとも1つの光IC7と電気的に接続される。そして、電源IC15は、少なくとも1つの光IC7に電力を供給する。
電気コネクタ17は、マザーボード3(又はマザーボード3と光モジュール1とを仲介するケーブル)が有している相手コネクタ(不図示)に取り外し可能に接続されて、モジュール基板5とマザーボード3とを電気的に接続する。電気コネクタ17(別の観点では電気コネクタ17と接続されるマザーボード3)は、モジュール基板5が有している導体(配線)を介して、モジュール基板5に実装されている電子部品と電気的に接続されている。例えば、電気コネクタ17は、光IC7、制御IC13及び電源IC15と直接的に又は他の電子素子を介して間接的に接続されている。他の電子素子は、例えば、モジュール基板5に実装されている能動素子若しくは受動素子、又はモジュール基板5の導体によって構成されている受動素子である。
受動部品19は、例えば、抵抗体、容量素子又はインダクタである。1つの受動部品19は、例えば、電気コネクタ17、光IC7、制御IC13及び電源IC15のうちのいずれか2つの間に介在して、インピーダンスの整合に寄与してよい。受動部品19の数、機能(抵抗体、容量素子又はインダクタ等)、形状(チップ型等)、大きさ、実装の方式(表面実装又はスルーホール実装等)、実装位置等は任意である。
冷却部品21(ヒートシンク)は、伝熱性が高い材料によって構成されている。また、冷却部品21は、モジュール基板5及びモジュール基板5に実装されている電子部品の少なくとも一方に対して直接的に又は他の材料(例えばグリース)を介して熱的に接続されている。これにより、冷却部品21は、光モジュール1の放熱性向上に寄与している。伝熱性が高い材料としては、例えば、金属(例えばアルミニウム)が挙げられる。冷却部品21は、例えば、その全体が同一材料によって一体的に形成されてよい。冷却部品21は、例えば、モジュール基板5に対して第1実装面5a側に配置されている。特に図示しないが、冷却部品21に代えて、又は加えて、モジュール基板5に対して第2実装面5b側に配置される冷却部品が設けられてもよい。
図3は、光モジュール1の信号処理系の構成の一例を示すブロック図である。ここでは、1つの光IC7、1つの制御IC13及び1つの電源IC15が示されている。
以上のとおり、光モジュール1は、モジュール基板5と、複数の光IC7と、複数のファイバ束9と、複数の光コネクタ11と、少なくとも1つの制御IC13と、少なくとも1つの電源IC15と、を有してよい。モジュール基板5は、第1方向(y方向)及び該第1方向に直交する第2方向(x方向)に広がる第1面(第1実装面5a)を有している。複数の光IC7は、y方向の位置を互いに異ならせて第1実装面5aに実装されており、光電変換を行う。複数のファイバ束9は、互いに並列に延びている複数の光ファイバ23をそれぞれ有しており、複数の光IC7から第2方向の第1側(+x側)へ延び出ている。複数の光コネクタ11は、複数のファイバ束9の複数の光IC7とは反対側の端部に位置しており、外部の光学要素(例えば不図示の光導波路)と光信号を伝達可能に接続される。少なくとも1つの制御IC13は、モジュール基板5に実装されており、複数の光IC7の少なくとも1つを制御する。少なくとも1つの電源IC15は、モジュール基板5に実装されており、複数の光IC7の少なくとも1つに電力を供給する。
以下、光モジュール1の種々の別の例について説明する。
図4A及び図4Bは複数の光IC7の配置の別の例及び更に別の例を示す模式的な平面図である。換言すれば、これらの図は、別の例に係る光モジュール1A及び更に別の例に係る光モジュール1Bを示している。
図5は、電源IC15に係る別の例を示す模式的な平面図である。換言すれば、図5は、別の例に係る光モジュール1Cを示している。
図4A及び図4Bに示したように、光IC7は、x方向(ファイバ束9が延び出る方向)の位置が互いに異なっていてもよい。このような態様において、複数のファイバ束9の長さが互いに同一である場合においては、複数のファイバ束9は、モジュール基板5の+x側の端部から延び出る長さが互いに相違する。ひいては、複数の光コネクタ11の位置が互いに相違する。この相違は、複数の光コネクタ11が接続される機器の構成等によっては、不都合を生じることがある。そこで、以下に述べる例では、複数のファイバ束9がモジュール基板5の+x側の端部から延び出る長さを揃えるための規定部材を設ける。また、以下に述べる例では、冷却部品が上記の規定部材として兼用される。具体的には、以下のとおりである。
Claims (10)
- 第1方向及び該第1方向に直交する第2方向に広がる第1面を有しているモジュール基板と、
前記第1方向の位置を互いに異ならせて前記第1面に実装されている、光電変換を行う複数の光ICと、
互いに並列に延びている複数の光ファイバをそれぞれ有しており、前記複数の光ICから前記第2方向の第1側へ延び出ている複数のファイバ束と、
前記複数のファイバ束の前記複数の光ICとは反対側の端部に位置しており、外部の光学要素と光信号を伝達可能に接続される複数の光コネクタと、
前記モジュール基板に実装されており、前記複数の光ICの少なくとも1つを制御する、少なくとも1つの制御ICと、
前記モジュール基板に実装されており、前記複数の光ICの少なくとも1つに電力を供給する、少なくとも1つの電源ICと、
を有している光モジュール。 - 前記複数の光ICにおいて、少なくとも1つの光ICは、前記第1方向における配置順が隣となる1つ又は2つの光ICと、前記第2方向の位置がずれている
請求項1に記載の光モジュール。 - 前記少なくとも1つの光ICは、前記隣となる1つ又は2つの光ICと、前記第2方向の配置範囲が重複しておらず、かつ前記第1方向における配置範囲の一部同士が重複している
請求項2に記載の光モジュール。 - 前記少なくとも1つの制御ICは、1つの制御ICのみを含み、
前記1つの制御ICは、前記複数の光ICを制御する
請求項1~3のいずれか1項に記載の光モジュール。 - 前記少なくとも1つの電源ICは、1つの電源ICのみを含み、
前記1つの電源ICは、前記複数の光ICに電力を供給する
請求項1~4のいずれか1項に記載の光モジュール。 - 前記少なくとも1つの電源ICは、2以上の電源ICを含み、
前記2以上の電源ICは、互いに異なる電圧の電力を供給し、かつ各電源ICが前記複数の光ICに電力を供給する
請求項1~4のいずれか1項に記載の光モジュール。 - 前記複数の光IC及び前記モジュール基板に直接又は間接に接しており、これらを冷却する冷却部品を更に有している
請求項1~6のいずれか1項に記載の光モジュール。 - 前記複数のファイバ束のうちの少なくとも1つのファイバ束の少なくとも一部の経路を規定する規定部材を更に有しており、
前記複数の光ICは、
第1光ICと、
前記第1光ICよりも前記第1側に位置している第2光ICと、を有しており、
前記複数のファイバ束は、
前記第1光ICから延び出ている第1ファイバ束と、
前記第2光ICから延び出ている第2ファイバ束と、を有しており、
各ファイバ束の、対応する光ICから対応する光コネクタまでの長さを全長と呼称し、各ファイバ束の、前記モジュール基板の前記第1側の端部よりも前記第2方向に平行に前記第1側へ延び出ることができる長さを延出長さと呼称するときに、
前記第1ファイバ束及び前記第2ファイバ束は互いに同じ全長を有しており、
前記規定部材は、前記第1ファイバ束の延出長さと、前記第2ファイバ束の延出長さとの差が、前記第1光IC及び前記第2光ICの前記第1方向における位置の差よりも小さくなるように、少なくとも前記第2ファイバ束の少なくとも一部の経路を規定する
請求項1~7のいずれか1項に記載の光モジュール。 - 前記規定部材は、前記複数の光ICに接しており、前記複数の光ICを冷却する
請求項8に記載の光モジュール。 - 請求項1~9のいずれか1項に記載の光モジュールと、
前記光モジュールと電気的に接続されるマザーボードと、
を有している光通信デバイス。
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