WO2011065384A1 - 光デバイス - Google Patents
光デバイス Download PDFInfo
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- WO2011065384A1 WO2011065384A1 PCT/JP2010/070943 JP2010070943W WO2011065384A1 WO 2011065384 A1 WO2011065384 A1 WO 2011065384A1 JP 2010070943 W JP2010070943 W JP 2010070943W WO 2011065384 A1 WO2011065384 A1 WO 2011065384A1
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- Prior art keywords
- substrate
- electrode
- optical device
- optical
- optical waveguide
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/37—Non-linear optics for second-harmonic generation
- G02F1/377—Non-linear optics for second-harmonic generation in an optical waveguide structure
- G02F1/3775—Non-linear optics for second-harmonic generation in an optical waveguide structure with a periodic structure, e.g. domain inversion, for quasi-phase-matching [QPM]
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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
- G02B6/4272—Cooling with mounting substrates of high thermal conductivity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
- G02F1/3505—Coatings; Housings; Supports
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/02—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 fibre
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/30—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 grating
- G02F2201/307—Reflective grating, i.e. Bragg grating
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/20—LiNbO3, LiTaO3
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/36—Micro- or nanomaterials
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/60—Temperature independent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
Definitions
- the present invention relates to an optical device in which an optical element in which an optical waveguide is formed is bonded on a substrate.
- An optical waveguide formed in an optical element or the like is a structure for confining light in the optical waveguide and guiding the light to a necessary place using a difference in refractive index between the optical waveguide portion and its periphery.
- the material used for the optical waveguide has a large refractive index, and characteristics such as size and refractive index may change due to thermal expansion or thermo-optic effect due to temperature. For this reason, measures for keeping the temperature of the optical waveguide constant are generally taken.
- a crystalline material such as lithium niobate (LiNbO 3 : LN) or lithium tantalate (LiTaO 3 : LT) is used.
- Polarization inversion is performed to give a wavelength conversion function in the crystal. This device is often used in combination with a laser diode (LD). The polarization inversion period is determined according to the wavelength to be converted. If the polarization inversion period is shifted due to the temperature, the wavelength conversion efficiency is lowered.
- a temperature control means is adopted so as to keep the temperature of the optical waveguide constant.
- a temperature control means is adopted so as to keep the temperature of the optical waveguide constant.
- Patent Document 1 by forming a thin film heater on an optical waveguide and heating the optical waveguide with this thin film heater, the temperature of the optical waveguide becomes constant regardless of the surrounding environment. To prevent a decrease in the wavelength conversion efficiency of the second harmonic generation element.
- a thin film heater is formed of a conductive film formed on an optical element, and temperature control is performed by heating the optical waveguide by passing a current through the conductive film. Therefore, in order to supply current to the thin film heater, it is necessary to form an electrode on the optical element and separately provide wiring for conducting connection with the electrode.
- the optical element is used by being mounted on a substrate or the like. For this reason, it is necessary to provide a region for mounting on the optical element.
- the conventional technique has a problem that the area of the optical element using an expensive crystal material is increased. Further, the conventional technique has a problem that the steps for mounting the optical element and conducting connection of the thin film heater are complicated.
- the optical device of the present invention adopts the configuration described below.
- the optical waveguide and the thin film heater for heating the optical waveguide are formed on the surface facing the substrate of the optical element,
- the optical element and the substrate are joined by a first joining portion and a second joining portion made of a metal material, and the thin film heater and the wiring on the substrate are connected via the first joining portion and the second joining portion.
- Conductive connection Further, the first joint and the second joint are positioned with the optical waveguide interposed therebetween.
- the first and second joints serve as joints between the optical device and the substrate, and serve as electrical connection points for supplying current to the thin film heater.
- the optical device of the present invention includes a first electrode and a second electrode formed on the thin film heater, and a first metal wiring and a second metal formed on the substrate.
- the first electrode and the first metal wiring are bonded to form a first bonding portion
- the second electrode and the second metal wiring are bonded to form a second bonding portion. It is characterized by forming.
- the optical device of the present invention includes a plurality of first electrodes, a plurality of second electrodes, a plurality of first metal wirings, and a plurality of second metal wirings in addition to the above-described configuration.
- Each first electrode and each first metal wiring are joined to form a first joint, and each second electrode and each second metal wiring are joined to each other. Two junctions are formed.
- a plurality of thin film heaters are formed in the optical element, and any one of the first electrodes and any one of the second electrodes are formed on each thin film heater. It is characterized by that. If each of the first joint and the second joint is one, the current supply to the thin film heater is two. Therefore, the current is supplied to the entire thin film heater, and the current cannot be supplied to a desired place. However, there are a plurality of joints, and it is possible to control the temperature at a desired position by supplying a current from a predetermined external position.
- the optical device of the present invention is characterized in that the metal material forming the first joint portion and the second joint portion of the optical device according to the present invention is Au. Since the connection part is an intermetallic joint between Au and Au, electrical conduction is possible.
- the optical device of the present invention is characterized in that, in addition to the above-described configuration, the first joint portion and the second joint portion of the optical device of the present invention have a micro-bump structure.
- contact is not a surface contact but a point contact, so that a metal clean surface necessary for metal-to-metal bonding can be easily obtained at the time of bonding, so that bonding is facilitated.
- the optical device of the present invention is characterized in that, in addition to the above-described configuration, the substrate and the optical element are bonded by surface activated bonding at the bonding portion. Bonding is achieved by activating the micro bump surface and the opposite surface with plasma. Therefore, it is possible to perform bonding at a low temperature instead of a bonding method in which heat is applied like bonding between Au and Sn. Become.
- the optical device of the present invention is characterized in that, in addition to the above-described configuration, the thin film heater of the optical device of the present invention is formed of a transparent electrode. Considering only the function as a thin film heater, there is no need for a transparent electrode. However, since there is a waveguide that guides light in the vicinity of the thin film heater, if this thin film heater is not transparent to light when it is irradiated with powerful light such as a laser, it absorbs light energy. Can be damaged.
- the optical device of the present invention is formed of indium oxide (ITO), zinc oxide (ZnO), tin oxide or a film doped with impurities in addition to the above-described structure. It is characterized by that.
- the optical device of the present invention is characterized in that the optical element in the optical device of the present invention is a wavelength conversion element that converts the wavelength of light guided through the optical waveguide.
- the optical element in the optical device of the present invention is a wavelength conversion element that converts the wavelength of light guided through the optical waveguide.
- a laser beam having a wavelength in the near-infrared region may be used, and a second harmonic generation (SHG) element may be used as the wavelength conversion element.
- SHG second harmonic generation
- the optical device of the present invention includes, on the substrate, a laser diode, an optical waveguide that guides the light emitted from the laser diode, and a wavelength conversion element that converts the wavelength of the light guided through the optical waveguide.
- the fiber Bragg grating is provided along the optical axis direction of the optical waveguide, is made of a material having good thermal conductivity, includes a base substrate on which the substrate is mounted, and the base substrate is located on one end side.
- the fiber Bragg is bonded to the substrate on which the laser diode is mounted, and a space is formed between the wavelength conversion element and the fiber Bragg grating between the substrate and the other end side.
- An end portion of the grating supports the substrate using a support base having good thermal conductivity.
- the heat of the laser diode can be efficiently radiated to the base substrate.
- a space is formed below the wavelength conversion element and the fiber Bragg grating and is not easily affected by the heat of the laser diode.
- the first electrode and the second electrode provided in the wavelength conversion element are respectively positioned at end positions of the wavelength conversion element with the optical waveguide interposed therebetween.
- an oxide film having a predetermined height is formed on a portion of the substrate where the first metal wiring and the plurality of second metal wirings are provided.
- the space height between the wavelength conversion elements is increased. According to this configuration, the height of the space between the substrate and the optical element can be increased, and the thermal conductivity can be decreased.
- the substrate is provided with a portion where the material of the substrate is processed into a porous shape in a portion where the first metal wiring and the plurality of second metal wirings are provided, It is characterized by low conductivity.
- the optical device of the present invention is provided with a plurality of the first electrode and the second electrode divided along the optical waveguide, and the divided first electrodes and the second electrodes. Is provided with an intrusion prevention wall made of the same material as the first electrode and the second electrode and electrically insulated from the first electrode and the second electrode. Further, the adhesive is prevented from entering the adhesive when the wavelength conversion element is fixed to the substrate. According to this configuration, the first electrode and the second electrode are divided to reduce the bonding area with the substrate.
- the optical element can be bonded using an adhesive, and the intrusion prevention wall is provided inside the adhesive. To prevent intrusion.
- the optical device of the present invention is characterized in that a plurality of grooves that do not penetrate are formed on the lower surface of the substrate. According to this configuration, the thermal resistance of the substrate can be increased by the plurality of grooves.
- the optical device of the present invention is characterized in that a recess is formed in the lower surface of the substrate leaving an edge of the substrate. According to this configuration, the thermal resistance of the substrate can be increased by the plurality of grooves.
- the wavelength conversion element has a heater provided in parallel along the optical waveguide, and a lead-out portion connected to the heater from the first electrode and the second electrode.
- the first electrode, the second electrode, and the lead-out portion are made of the same material, and the first electrode and the second electrode are connected to the first metal wiring and the second electrode of the substrate. It is used for joining with metal wiring and is also used as an electrode of the heater. According to this configuration, the temperature of the optical waveguide can be controlled by providing the heater along the optical waveguide, and it is not necessary to individually derive the heater electrodes.
- the substrate and the optical element are joined by a joint portion made of a metal material, and the thin film heater is conductively connected through the joint portion, thereby eliminating the need to separately provide a wiring for the conductive connection. It is possible to reduce the size by eliminating an extra area on the optical element, and to simplify the manufacturing process.
- FIG. 1 is an explanatory diagram illustrating a configuration of an optical device according to a first embodiment of the present invention.
- FIG. 2 is an explanatory diagram showing the configuration of the optical device according to the second embodiment of the present invention.
- FIG. 3 is an explanatory diagram showing the configuration of the optical device according to the third embodiment of the present invention.
- FIG. 4 is a front view showing the configuration of the optical device according to the fourth embodiment of the present invention.
- FIG. 5 is a front view showing the configuration of another optical device according to the fourth embodiment of the present invention.
- FIG. 6 is a front view showing the configuration of another optical device according to Embodiment 4 of the present invention.
- FIG. 7-1 is a side view showing a bonding structure between the wavelength conversion element and the substrate.
- FIG. 7-2 is a side view showing a bonding structure between the wavelength conversion element and the substrate.
- FIG. 7C is a side view of the bonding structure between the wavelength conversion element and the substrate.
- FIG. 8-1 is a side view showing the configuration of the optical device according to the fifth embodiment of the present invention.
- FIG. 8B is a top view of the optical device shown in FIG.
- FIG. 8C is a side view illustrating the configuration of another optical device according to the fifth embodiment.
- FIG. 9A is a front view illustrating the configuration of the optical device according to the sixth embodiment.
- FIG. 9-2 is a front view illustrating the configuration of another optical device according to the sixth embodiment.
- FIG. 9C is a front view of the configuration of another optical device according to the sixth embodiment.
- FIG. 9A is a front view illustrating the configuration of the optical device according to the sixth embodiment.
- FIG. 9-2 is a front view illustrating the configuration of another optical device according to the sixth embodiment.
- FIG. 9C is a
- FIG. 10A is a plan view illustrating the structure of the heater.
- FIG. 10-2 is a side view illustrating the structure of the heater.
- FIG. 10C is a side view of the polarization inversion electrode.
- FIG. 11A is an explanatory diagram of detecting the voltage applied to the heater through a plurality of divided electrodes.
- FIG. 11B is an explanatory diagram of detecting the voltage applied to the heater through the plurality of divided electrodes.
- FIG. 1 is an explanatory diagram illustrating a configuration of an optical device 20 according to a first embodiment of the present invention.
- FIG. 1A is a cross-sectional view of the optical device 20.
- FIG.1 (b) is a top view of the optical device 20, and shows the state seen from the downward direction of Fig.1 (a).
- FIG. 1B shows only some members constituting the optical device 20.
- FIG. 1A shows a cross section of a portion indicated by AA ′ in FIG.
- the optical device 20 has a configuration in which an optical element 6 on which an optical waveguide 8 for guiding light is formed is bonded to a substrate 2.
- an optical element 6 on which an optical waveguide 8 for guiding light is formed is bonded to a substrate 2.
- the optical waveguide 8 is formed on the surface of the optical element 6 facing the substrate 2.
- the optical waveguide 8 a case where the optical element 6 is formed of LiNbO 3 (lithium niobate, LN: Lithium Niobate) will be described. In this case, a method called a proton exchange (PE) method is often used.
- PE proton exchange
- the optical element made of LiNbO 3 is immersed in pyrophosphoric acid in a state where the position where the PE method is desired to be performed (the place where the optical waveguide is formed) is opened, so that Li in LiNbO 3 and pyrophosphoric acid Ion exchange between protons. Thereafter, annealing is performed to stabilize the optical characteristics. The shape of this ion exchange region is controlled by the opening width, annealing time, and the like.
- the optical waveguide 8 thus formed has a higher refractive index than the surrounding LiNbO 3 and can easily guide light.
- a polarization inversion region is formed in the optical waveguide 8 in order to convert the wavelength of light incident from one end of the element as a fundamental wave.
- the domain-inverted region refers to a region in which the polarization states of LiNbO 3 constituting the optical element 6 are different from each other by 180 ° with a specific period. This period is designed as a wavelength conversion element according to the wavelength to be used, the temperature environment to be used, etc., and is formed with a period of about several ⁇ m.
- the polarization is reversed in a direction different from the spontaneous polarization by 180 °. There are several methods for reversing the polarization, but there is typically a high electric field application method in which a high electric field is applied to reverse the polarization direction.
- a transparent conductive film is formed as the thin film heater 4 on the surface where the optical waveguide 8 is formed.
- an indium oxide (ITO) film can be used as the transparent conductive film for forming the thin film heater 4.
- ITO indium oxide
- the thin film heater 4 by forming the thin film heater 4 with a conductive film that is transparent to the light guided through the optical waveguide 8, strong light such as a laser is guided through the optical waveguide 8, and the thin film heater 4 is generated by this strong light. Even when the light is irradiated, damage to the thin film heater 4 due to absorption of this light can be suppressed.
- a transparent conductive film for forming the thin film heater 4 a similar effect can be expected by using zinc oxide (ZnO), tin oxide, or a film doped with impurities in addition to the indium oxide (ITO) film.
- a first electrode 10a located on one side with respect to the waveguide 8 and a second electrode 10b located on the other side are formed.
- the first metal wiring 16 a and the second metal wiring 16 b are formed on the substrate 2.
- micro bumps 18 are formed at positions corresponding to the first electrode 10a and the second electrode 10b formed in the optical element 6.
- the first electrode 10a and the second electrode 10b formed on the optical element 6 and the first metal wiring 16a and the second metal wiring 16b formed on the substrate 2 are made of, for example, gold (Au). Formed as a material.
- the first electrode 10a and the second electrode 10b formed using this gold (Au) as a material, and the first metal wiring 16a and the second metal wiring 16b are bonded by, for example, room temperature activation bonding. .
- This room temperature activation bonding is performed by exposing the micro bumps 18 on the first metal wiring 16a and the second metal wiring 16b and the surfaces of the first electrode 10a and the second electrode 10b to argon (Ar) plasma. By activating and applying pressure at a low temperature, the microbumps 18 are crushed and the clean surfaces are exposed, and each microbump 18 is bonded to the first electrode 10a and the second electrode 10b by metal-to-metal bonding. .
- the first electrode 10 a located on one side of the waveguide 8 and the first metal wiring 16 a form a first joint 12, and the waveguide 8
- the second electrode 10b located on the other side and the second metal wiring 16b form the second bonding portion 14.
- the optical element 6 is bonded to the substrate 2 by the first bonding portion 12 and the second bonding portion 14. At this time, the first junction 12 and the second junction 14 are not located directly under the waveguide 8 but are located on both sides of the waveguide 8. It is possible to avoid weighting 8.
- the first metal wiring 16 a is electrically connected to the thin film heater 4 through the first joint 12, and the second metal wiring 16 b is connected to the thin film heater 4 through the second joint 12. Electrically connected. Therefore, by passing a current between the first metal wiring 16a and the second metal wiring 16b, a current flows through the thin film heater 4 as shown by the applied current 27 in FIG. Heat is transmitted to the optical waveguide 8 and the optical waveguide 8 is heated, and temperature control becomes possible.
- the substrate 2 and the optical element 6 are joined by the first joint 12 and the second joint 14 made of a metal material, and these joints are made.
- the thin film heater 4 is conductively connected through the section.
- FIG. 2 is an explanatory diagram showing the configuration of the optical device 30 according to the second embodiment of the present invention.
- FIG. 2A is a cross-sectional view of the optical device 30.
- FIG. 2B is a plan view of the optical device 30 and shows a state seen from below in FIG. For the sake of explanation, FIG. 2B shows only some members constituting the optical device 30.
- FIG. 2A shows a cross section of a portion indicated by BB ′ in FIG.
- the optical device 30 according to the second embodiment of the present invention has a configuration in which the optical element 6 in which the optical waveguide 8 for guiding light is formed is bonded to the substrate 2.
- the optical device 30 of Example 2 is different from the optical device 20 of Example 1 in the electrodes formed on the optical element 6 and the metal wiring formed on the substrate 2.
- a plurality of first metal wirings (in the example shown in FIG. 2B, the first metal wirings 16a1, 16a2, and 16a3) are formed on the substrate 2.
- a plurality of second metal wirings (second metal wirings 16b1, 16b2, and 16b3 in the example shown in FIG. 2B) are formed on the substrate 2.
- the optical device 30 includes a plurality of first electrodes (in the example shown in FIG. 2B, the first electrodes 10a1, 10a2, and 10a3) on the thin film heater 4 of the optical element 6. Is formed. Further, in the optical device 30, a plurality of second electrodes (second electrodes 10b1, 10b2, 10b3 in the example shown in FIG. 2B) are formed on the thin film heater 4 of the optical element 6.
- the first metal wirings 16a1, 16a2, 16a3 and the second metal wirings 16b1, 16b2, 16b3 are formed in the optical element 6 and correspond to the first electrodes 10a1, 10a2, 10a3 and the second electrodes 10b1, 10b2, 10b3.
- Micro bumps 18 are formed at the positions.
- the first electrodes 10a1, 10a2, 10a3, the second electrodes 10b1, 10b2, 10b3, the first metal wires 16a1, 16a2, 16a3 and the second metal wires 16b1, 16b2, 16b3 are made of, for example, gold (Au) And bonded as shown in FIG. 2 by room temperature activation bonding.
- the first electrode 10a1, 10a2, 10a3 and the first metal wiring 16a1, 16a2, 16a3 form the first joint portion 12, and the second electrode 10b1, 10b2, 10b3 and the first metal wiring 16b1, 16b2,
- the second joint portion 14 is formed by 16b3.
- the optical element 6 is bonded to the substrate 2 by the first bonding portion 12 and the second bonding portion 14.
- first metal wirings 16a1, 16a2, and 16a3 are electrically connected to the thin film heater 4 through the first joint portion 12, respectively, and the second metal wirings 16b1, 16b2, and 16b3 are respectively connected to the second metal wirings 16b1, 16b2, and 16b3. It is electrically connected to the thin film heater 4 through the joint 14.
- the region 22 of the thin film heater 4 generates heat, and the optical waveguide 8 The area is heavily heated.
- the region 24 of the optical waveguide 8 is preferentially heated, so that the first metal wiring 16a3 and the second metal wiring 16
- the applied current 28c between 16b3 By flowing the applied current 28c between 16b3, the region 26 of the optical waveguide 8 is preferentially heated.
- the optical device 30 can optimally heat the optical waveguide 8 by selecting and combining the metal wirings through which current flows.
- the optical waveguide 8 is positioned on the side facing the substrate 2, and the thin film heater 4 is formed on the waveguide 8, so that the optical waveguide 8 is on the opposite side of the substrate 2.
- the effect of temperature control by heating the optical waveguide 8 by the thin film heater 4 can be increased.
- the optical waveguide 8 is positioned on the side facing the substrate 2, the height of the optical element can be adjusted with reference to the upper surface of the substrate 2. Therefore, height adjustment with the light emitting element can be easily performed in optical coupling with other light emitting elements such as a laser diode.
- FIG. 3 is an explanatory diagram showing the configuration of the optical device 40 according to the third embodiment of the present invention.
- a sectional view of the optical device 40 of the third embodiment is the same as the sectional view of the optical device 30 of the second embodiment shown in FIG.
- FIG. 3 is a plan view of the optical device 40 and shows only a part of members constituting the optical device 40.
- the optical device 40 of Example 3 has a configuration in which an optical element 6 in which an optical waveguide 8 for guiding light is formed is bonded to a substrate 2.
- the optical device 40 of Example 3 is different from the optical device 30 of Example 2 in the shape of the thin film heater 4 formed on the optical element 6.
- a plurality of thin film heaters are formed on the substrate 2.
- thin film heaters 4a, 4b, and 4c are formed on the substrate 2.
- the first electrode 10a1 and the second electrode 10b1 are formed on the thin film heater 4a
- the first electrode 10a2 and the second electrode 10b2 are formed on the thin film heater 4b.
- a first electrode 10a3 and a second electrode 10b3 are formed on the heater 4c.
- the first metal wiring 16a1 is electrically connected to the thin film heater 4a via the first bonding portion 12, and the second metal wiring 16b1 is connected to the thin film heater 4a via the second bonding portion 14. And electrically connected.
- the first metal wiring 16a2 is electrically connected to the thin film heater 4b through the first joint 12, and the second metal wiring 16b2 is connected to the thin film heater 4b through the second joint 14. And electrically connected.
- the first metal wiring 16a3 is electrically connected to the thin film heater 4c via the first joint 12, and the second metal wiring 16b3 is connected to the thin film heater 4c via the second joint 14. Electrically connected.
- the optical device 40 having such a configuration, for example, as shown in FIG. 3, by applying a current between the first metal wiring 16 a 1 and the second metal wiring 16 b 1, it is applied only to the region 22 of the thin film heater 4.
- the current 28a flows to generate heat, and only this region of the optical waveguide 8 is heated.
- the applied current 28b flows only in the region 24 of the thin film heater 4 to generate heat, and only this region of the optical waveguide 8 is heated. Is done.
- the applied current 28c flows only in the region 26 of the thin film heater 4 to generate heat, and only the region 26 of the optical waveguide 8 is heated.
- the optical device 40 by applying the applied current 28a between all the first metal wirings 16a1, 16a2, 16a3 and all the second metal wirings 16b1, 16b2, 16b3, it is possible to heat all the regions of the optical waveguide 8. it can.
- the plurality of thin film heaters 4a, 4b, and 4c are formed, and the thin film heaters 4a, 4b, and 4c are different from each other. By being connected to, it becomes possible to reliably perform partial heating of the optical waveguide 8 as compared with the optical device 30 of the second embodiment.
- an example of an optical waveguide formed by the PE method has been shown. However, the same effect can be expected even when a different optical waveguide forming method is used.
- An example is a ridge type optical waveguide. Instead of increasing the refractive index of a part of LiNbO 3 as in the PE method, an optical waveguide is created by processing LiNbO 3 itself, and the difference in refractive index between LiNbO 3 and the surrounding air is used. Thus, the light is guided.
- FIG. 4 is a front view showing the configuration of the optical device 50 according to the fourth embodiment of the present invention.
- a temperature control structure of the optical element will be described.
- a laser diode (LD) 51, a wavelength conversion element (PPLN) 52, and a fiber Bragg grating (FBG) 53 are mounted as a plurality of optical elements.
- the thin film heater 4 described above is provided below the wavelength conversion element 52.
- the substrate 2 is made of, for example, silicon (Si).
- the substrate 2 is provided on a metal base substrate 55 having good heat conduction characteristics.
- the temperature control shown in FIG. 1) The temperature of the optical element on the substrate 2 is made constant so that the wavelength of the wavelength conversion element 52 and the conversion wavelength of the FBG 53 are aligned. 2)
- the heat generated from the LD 51 is radiated to the outside and kept at the external environmental temperature + 5 ° C.
- the thin film heater 4 in the part of the wavelength conversion element 52 is constantly heated to the maximum environmental temperature + 5 ° C.
- the base substrate 55 is devised for bonding to the substrate 2.
- the portion of the substrate 2 on which the LD 51 is mounted is bonded to the base substrate 55 over the length L1 of the LD 51.
- the portion ahead of the LD 51 that is, the portion of the substrate 2 on which the wavelength conversion element 52 and the FBG 53 are provided, forms a space 56 between the base substrate 55 over the length L2 to insulate.
- the concave portion 55 a is formed on the base substrate 55 by grinding or the like, and a portion to be bonded to the substrate 2 is not provided.
- a support base 57 having good thermal conductivity is provided at the end of the FBG 53, and the FBG 53 is supported by the support base 57.
- the support base 57 is not limited to the one having thermal conductivity according to the design of the thermal control, and one having heat insulation may be used.
- the heat generation of the LD 51 is directly radiated from the substrate 2 to the base substrate 55 or is transmitted only in the length direction on the substrate 2.
- the temperature in the length direction (horizontal direction in the figure) of the substrate 2 has a temperature gradient as shown.
- the LD 51 is controlled to 45 ° C. by heat radiation.
- heat from the LD 51 is transmitted in the length direction of the substrate 2 and the temperature gradually decreases.
- the thin film heater 4 constantly controls heating so that the wavelength conversion element 52 is 45 ° C., thereby compensating for the temperature gradient.
- a plurality of optical elements (LD 51, wavelength conversion element 52, FBG 53) on the substrate 2 are fixed at a predetermined temperature with a simple structure in which the recess 55a is formed in the base substrate 55. Can be retained.
- FIG. 5 is a front view showing the configuration of another optical device 50 according to the fourth embodiment of the present invention.
- the structure of the optical device shown in FIG. 5 is the same as that of FIG. 4, and the temperature control is different.
- Heat generated from the LD 51 is radiated to the outside and kept at the external environmental temperature + 5 ° C. 2)
- the temperatures of the wavelength conversion element 52 and the FBG 53 are controlled to be the same as LD + 5 ° C. 3)
- the wavelength conversion element 52 is corrected and heated by the thin film heater 4 so that the wavelength of the FBG 53 and the conversion wavelength of the wavelength conversion element 52 coincide.
- the wavelength of the FBG 53 is selected in advance so that the wavelength of the FBG 53 and the conversion wavelength of the wavelength conversion element 52 coincide only by heating.
- a plurality of optical elements (LD 51, wavelength conversion element 52, FBG 53) on the substrate 2 can be held at a constant temperature with a simple structure in which the recess 55a is formed in the base substrate 55. Further, the temperature of the optical device 50 can be changed according to the external environment temperature.
- FIG. 6 is a front view showing the configuration of another optical device 50A of Embodiment 4 of the present invention.
- the heat generated by the LD 51 is radiated to the outside as much as possible. 6 differs from the structure shown in FIG. 5 in that the above-described thin film heater 4 is provided below the wavelength conversion element 52 and the FBG 53. Further, the front surface of the lower surface of the base substrate 55 is bonded to a radiator 58 that is at ambient temperature. For this reason, the heat generated from the LD 51 is radiated to the radiator 58 via the substrate 2 and is radiated to the external environment via the radiator 58.
- FIGS. 7-1 to 7-3 are side views showing the joint structure between the wavelength conversion element 52 and the substrate 2, respectively. As shown in these drawings, a space is formed between the substrate 2 and the space immediately below the wavelength conversion element 52 for heat insulation. With the structure shown in FIGS. 7-1 to 7-3, the wavelength conversion element 52 is maintained at a constant temperature at a high temperature.
- a space portion 71 corresponding to the height H1 of the first electrode 10a and the first metal wiring 16a (the second electrode 10b and the second metal wiring 16b) is formed.
- an oxide film 72 is formed on the substrate 2 where the first metal wiring 16a and the second metal wiring 16b are formed.
- the height H2 of the space 71 can be formed higher by the height of the oxide film 72.
- a recess 74 is formed by etching or the like in the substrate 2 between the first metal wiring 16a and the second metal wiring 16b.
- the height H3 can be formed high.
- the wavelength conversion element 52 is configured to increase the thermal resistance Rw to the side portions (both side portions with the optical waveguide 8 in the center). With the structure shown in FIGS. 8-1 to 8-3, the wavelength conversion element 52 is kept at a constant temperature at a high temperature.
- FIG. 8-1 is a side view showing the configuration of the optical device 80 according to the fifth embodiment of the present invention.
- the first electrode 10a and the second electrode 10b which are fixed portions of the optical device, are arranged at both ends of the wavelength conversion element 52, and the first electrode 10a, the second electrode 10b, The distance L between is increased. Further, the height H of the wavelength conversion element 52 is formed low. Thereby, the thermal resistance with the optical waveguide 8 part provided in the center is increased, and the optical waveguide 8 part is thermally insulated.
- FIG. 8-2 is a top view of the optical device 80 shown in FIG. 8-1.
- the joint portion of the wavelength conversion element 52 to the substrate 2 is divided. That is, the first electrode 10a and the second electrode 10b are partially formed in a direction along the length direction of the optical waveguide 8 when viewed from the top.
- the first electrode 10a and the second electrode 10b are formed in a rectangular shape and separated in the length direction of the optical waveguide 8, and the first metal wiring 16a on the substrate 2 side and the second electrode 10b are separated from each other. To the metal wiring 16b.
- the area of the joint which is a portion that conducts heat to the substrate 2 is reduced.
- the low-heat conductive adhesive 81 is used and both ends of the wavelength conversion element 52 are arranged in the length direction. It is made to adhere to the substrate 2. Thereby, the fixed intensity
- the first electrode 10a and the second electrode 10b are divided in the length direction of the wavelength conversion element 52, but a plurality of divided first electrodes 10a (a plurality of second electrodes 10b).
- An intrusion prevention wall 82 made of the same metal material (Au) as those of the first electrode 10a and the second electrode 10b is provided between the first electrode 10a and the second electrode 10b.
- the intrusion prevention wall 82 itself is formed by etching or the like simultaneously with the first electrode 10a and the second electrode 10b in a state where they are electrically insulated. By providing this intrusion prevention wall 82, it is possible to prevent intrusion into the adhesive 81 (in the direction of the optical waveguide 8 shown in FIG. 8-2).
- the intrusion prevention wall 82 is formed as thin as possible in width W so as not to affect the heat.
- an oxide film 72 shown in FIG. 7-2 is provided in addition to the structure shown in FIGS. 8-1 and 8-2, and the gap between the wavelength conversion element 52 and the substrate 2 is provided. It is good also as a structure which increases height and increases thermal resistance.
- FIG. 8-3 is a side view illustrating the configuration of another optical device 80 according to the fifth embodiment.
- a nanocrystal portion 83 formed by microcrystalline silicon in a porous shape is formed on the upper surface side of the substrate 2 made of silicon at a predetermined height H (about 10 ⁇ m).
- a first metal wiring 16 a and a second metal wiring 16 b are formed on the nanocrystal portion 83.
- This nanocrystal portion 83 can increase the thermal resistance.
- FIGS. 9-1 to 9-3 Next, the configuration of the optical device 90 according to the sixth embodiment of the present invention will be described with reference to FIGS. 9-1 to 9-3.
- the thermal resistance RL in the length direction of the substrate 2 (the optical axis direction of the optical waveguide 8) is increased.
- FIG. 9A is a front view illustrating the configuration of the optical device 90 according to the sixth embodiment. In the structure shown in FIG. 9A, the portion of the substrate 2 on which the LD 51 is mounted is bonded to the base substrate 55 over the length L1 of the LD 51, as described with reference to FIG.
- the portion ahead of the LD 51 forms a space 56 between the base substrate 55 over the length L2 to insulate.
- a support base 57 with good thermal conductivity is provided at the end of the FBG 53, and the FBG 53 is supported by the support base 57.
- a support member 91 made of a heat insulating material is provided on the base substrate 55 at the end portion position of the substrate 2 to support the end portion of the substrate 2.
- the substrate 2 is thinly formed by etching or the like.
- the LD 51 part directly radiates heat from the substrate 2 to the radiator 58 via the base substrate 55.
- the support member 91 is not limited to the one having thermal conductivity according to the design of the thermal control, and one having heat insulation may be used.
- FIG. 9-2 is a front view illustrating the configuration of another optical device 90 according to the sixth embodiment. For convenience, only the substrate 2 is shown. A plurality of grooves 92 are formed in the lower surface of the substrate 2. The groove 92 is provided without penetrating up to the top of the substrate 2 in order to maintain the strength of the substrate 2. The opening of the groove 92 can be any shape such as a circle or a square.
- FIG. 9-3 is a front view showing the configuration of another optical device 90 of the sixth embodiment.
- a recess 93 is formed in the lower surface of the substrate 2.
- the recess 93 is provided by hollowing out the inside leaving the edge of the substrate.
- Example 7 FIGS. 10-1 and 10-2 Next, the configuration of the optical device 100 according to the seventh embodiment of the present invention will be described.
- FIG. 10A is a plan view illustrating the structure of the heater
- FIG. 10B is a side view illustrating the structure of the heater.
- the first electrode 10a and the second electrode 10b made of Au are divided into a plurality of parts (see FIG. 8-2). Then, from the plurality of first electrodes 10 a side, lead portions 101 a made of the same Au are provided toward the optical waveguide 8, respectively, and a heater made of Au in parallel along the optical waveguide 8 is provided at the tip of the lead portion 101 a.
- a lead-out portion 101b made of Au is provided from each of the plurality of second electrodes 10b toward the optical waveguide 8, and a heater 102b made of Au in parallel along the optical waveguide 8 is provided at the tip of the lead-out portion 101b. Is provided.
- the optical waveguide 8 is provided in the convex ridge portion, but the optical waveguide 8 is not limited to being provided in the ridge structure portion.
- the heaters 102a and 102b can be disposed close to the optical waveguide 8, and the optical waveguide 8 is directly heated by the heaters 102a and 102b. I can do it now.
- the first electrode 10a and the second electrode 10b which are the electrodes of the wavelength conversion element 52, are shared as the electrodes of the heaters 102a and 102b.
- the waveguide 8 can be efficiently heated most recently, and the temperature of the optical waveguide 8 can be controlled constant.
- the first electrode 10a, the second electrode 10b, the lead-out portions 101a and 101b, and the heaters 102a and 102b can be easily patterned with the same material (for example, Au), and the same electrode as the electrode to be joined
- the material can also function as a heater, and it is not necessary to individually derive the electrodes of the heaters 102a and 102b.
- the pattern size can be adjusted to a resistance value suitable for pulse width modulation control such as 5V.
- a resistance value suitable for pulse width modulation control such as 5V.
- the resistance ratio of Au ⁇ 2.35 ⁇ 10 ⁇ 8 ⁇ m
- L 1 ⁇ 10 ⁇ 3 m
- A 2 ⁇ 0.5 ⁇ 10 ⁇ 12 m 2 .
- 5 V when 5 V is applied as pulse width modulation, it is 1.06 W at 235 mA, so the length of the derivation units 101 a and 101 b may be about 2 mm.
- FIG. 10-3 is a side view showing the electrode for inversion of polarization.
- the width of the polarization inversion electrode 105 is not provided over the entire width of the wavelength conversion element 52 but with a predetermined width W1 corresponding to the ridge portion of the optical waveguide 8.
- the polarization inversion electrode 105 is formed of an ITO film.
- Reference numeral 106 denotes an adhesive layer. Thereby, the heat conduction in the electrode 105 part for polarization inversion by the ITO film can be reduced.
- FIGS. 11A and 11B are explanatory diagrams for detecting the applied voltage of the heater through a plurality of divided electrodes.
- the temperature control can be performed in a block manner using the plurality of first electrodes 10a and second electrodes 10b described above, the applied voltage between the electrodes at this time is accurately determined by a general four-terminal method as shown in the figure. Can be detected.
- a plurality of first electrodes 10a will be described as an example.
- FIG. 11A when detecting the voltage applied to the heater 102a2 (R2), the voltage V is detected by the pair of first electrodes 10a2 and 10a3 of the heater 102a2.
- a current may be supplied from both the adjacent electrodes 10a2 and 10a3 10a1 and 10a4.
- the voltage applied to the heater 102a3 (R3) is detected, the voltage V is detected by the pair of first electrodes 10a3 and 10a4 of the heater 102a3.
- a current may be supplied from both the adjacent electrodes 10a3 and 10a4 10a2 and 10a5.
- the optical device according to the present invention has a waveguide for guiding light, and is an element having both mounting and temperature control functions with a minimum mounting area.
- the structure can be applied to an element and the size is reduced.
- Optical element 8 Optical waveguide 10a, 10a1, 10a2, 10a3 First electrode 10b, 10b1, 10b2, 10b3 Second electrode 12 First joint 14 Second joint Part 16a, 16a1, 16a2, 16a3 First metal wiring 16b, 16b1, 16b2, 16b3 Second metal wiring 18 Micro bump 20, 30, 40 Optical device 22, 24, 26 Region 27, 28a, 28b, 28c Applied current 51 Laser diode (LD) 52 Wavelength Conversion Element 53 Fiber Bragg Grating (FBG) 55 Base substrate 55a Concave portion 56 Space portion 57 Support base 58 Radiator 101a, 101b Lead-out portion 102a, 102b Heater
- LD Laser diode
- FBG Fiber Bragg Grating
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Abstract
Description
まず、本発明の実施例1の光デバイスの構成について説明する。図1は、本発明の実施例1の光デバイス20の構成を示す説明図である。図1(a)は光デバイス20の断面図である。図1(b)は光デバイス20の平面図であり、図1(a)の下方から見た状態を示す。説明のため、図1(b)では光デバイス20を構成する一部の部材のみを示す。また、図1(a)は、図1(b)のA-A’で示す箇所の断面を示す。
次に、本発明の実施例2の光デバイスの構成について説明する。図2は、本発明の実施例2の光デバイス30の構成を示す説明図である。図2(a)は光デバイス30の断面図である。図2(b)は光デバイス30の平面図であり、図2(a)の下方から見た状態を示す。説明のため、図2(b)では光デバイス30を構成する一部の部材のみを示す。また、図2(a)は、図2(b)のB-B’で示す箇所の断面を示す。
次に、本発明の実施例3の光デバイスの構成について説明する。図3は、本発明の実施例3の光デバイス40の構成を示す説明図である。実施例3の光デバイス40の断面図は、図2(a)に示す実施例2の光デバイス30の断面図と同じになるので、省略する。図3は光デバイス40の平面図であり、光デバイス40を構成する一部の部材のみを示す。
次に、本発明の実施例4の光デバイスの構成について説明する。図4は、本発明の実施例4の光デバイス50の構成を示す正面図である。実施例4では、光素子の温度制御の構造について説明する。基板2上には複数の光素子としてレーザダイオード(LD)51、波長変換素子(PPLN)52、ファイバーブラッググレーティング(FBG)53が搭載されている。図示のように、波長変換素子52の下部には上述した薄膜ヒータ4が設けられている。基板2は、例えばシリコン(Si)からなる。この基板2は、熱伝導特性の良好な金属製のベース基板55上に設けられている。
1)波長変換素子52の波長と、FBG53の変換波長をそろえるために、基板2上の光素子を温度一定にする。
2)LD51からの発熱は、外部に放熱して外部環境温度+5℃に抑える。
3)波長変換素子52の部分の薄膜ヒータ4により、最高環境温度+5℃まで常時加熱する。
次に、本発明の実施例4の他の光デバイスの構成について説明する。図5は、本発明の実施例4の他の光デバイス50の構成を示す正面図である。図5に示す光デバイスの構造は、図4と同様であり、温度制御が異なる。
1)LD51からの発熱は、外部に放熱して外部環境温度+5℃に抑える。
2)波長変換素子52、およびFBG53の温度は、LD+5℃と同じになるように制御する。
3)ただし、FBG53の波長と、波長変換素子52の変換波長が一致するように、薄膜ヒータ4により波長変換素子52を補正加熱する。加熱だけでFBG53の波長と、波長変換素子52の変換波長が一致するように、予めFBG53の波長を選択する。
次に、本発明の実施例4の他の光デバイスの構成について説明する。図6は、本発明の実施例4の他の光デバイス50Aの構成を示す正面図である。図6に示す構造では、LD51の発熱は、できるだけ外部に放熱するようにする。図6の構造において、図5に示した構造と異なる点は、波長変換素子52とFBG53の下部に上述した薄膜ヒータ4を設ける。また、ベース基板55の下面前面は、環境温度にある放熱器58に接合する。このため、LD51からの発熱は、基板2を介して放熱器58に放熱し、放熱器58を介して外部環境に放熱する。
次に、本発明の実施例5の光デバイスの構成について図8-1~図8-3を用いて説明する。実施例5では、波長変換素子52について、側部(光導波路8を中央とした両側部)への熱抵抗Rwを増やす構成としている。これら図8-1~図8-3に示す構造により、波長変換素子52を高温で一定温度に保つようにする。
次に、本発明の実施例6の光デバイス90の構成について図9-1~図9-3を用いて説明する。実施例6では、基板2の長さ方向(光導波路8の光軸方向)の熱抵抗RLを増やす構成としている。図9-1は、実施例6の光デバイス90の構成を示す正面図である。図9-1に示す構造では、図6で説明したと同様に、LD51が搭載された基板2の部分は、LD51の長さL1にわたってベース基板55に接合させる。また、LD51から先の部分、すなわち、波長変換素子52とFBG53が設けられた基板2の部分は、長さL2にわたってベース基板55との間に空間部56を形成して断熱する。FBG53の端部には、熱伝導性の良好な支持台57を設け、支持台57でFBG53を支持する。また、基板2の端部位置のベース基板55には、熱絶縁性材質からなる支持部材91を設け、基板2の端部を支持する。そして、基板2はエッチング等で薄く形成する。LD51部分は基板2からベース基板55を介して放熱器58に直接放熱する。ただし、この支持部材91は、熱制御の設計に応じて熱伝導性を有するものに限らず、断熱性を有するものを用いてもよい。
次に、本発明の実施例7の光デバイス100の構成について説明する。実施例7では、ヒータで光導波路8の直近を加熱する構成について説明する。図10-1は、ヒータの構造を説明する平面図、図10-2は、ヒータの構造を説明する側面図である。Auからなる第1の電極10aと、第2の電極10bは複数に分割して設ける(図8-2参照)。そして、この複数の第1の電極10a側からはそれぞれ光導波路8に向けて同じAuからなる導出部101aを設け、導出部101aの先端には、光導波路8に沿って平行にAuからなるヒータ102aを設ける。同様に、複数の第2の電極10b側からはそれぞれ光導波路8に向けてAuからなる導出部101bを設け、導出部101bの先端には、光導波路8に沿って平行にAuからなるヒータ102bを設ける。
4、4a、4b、4c 薄膜ヒータ
6 光素子
8 光導波路
10a、10a1、10a2、10a3 第1の電極
10b、10b1、10b2、10b3 第2の電極
12 第1の接合部
14 第2の接合部
16a、16a1、16a2、16a3 第1の金属配線
16b、16b1、16b2、16b3 第2の金属配線
18 マイクロバンプ
20、30、40 光デバイス
22、24、26 領域
27、28a、28b、28c 印加電流
51 レーザダイオード(LD)
52 波長変換素子
53 ファイバーブラッググレーティング(FBG)
55 ベース基板
55a 凹部
56 空間部
57 支持台
58 放熱器
101a、101b 導出部
102a、102b ヒータ
Claims (18)
- 光導波路が形成された光素子が基板に接合された光デバイスにおいて、
前記光素子の前記基板と向かい合う面に、前記光導波路と、前記光導波路を加熱する薄膜ヒータとが形成され、
前記光素子と前記基板とは、金属材料からなる第1の接合部と第2の接合部により接合され、
前記第1の接合部と前記第2の接合部を介して、前記薄膜ヒータと前記基板上の配線とが導通接続され、
前記第1の接合部と前記第2の接合部は、前記光導波路を挟んで位置することを特徴とする光デバイス。 - 前記薄膜ヒータの上に形成された第1の電極および第2の電極と、
前記基板上に形成された第1の金属配線および第2の金属配線と、を備え、
前記第1の電極と前記第1の金属配線とが接合して前記第1の接合部を形成し、
前記第2の電極と前記第2の金属配線とが接合して前記第2の接合部を形成することを特徴とする請求項1に記載の光デバイス。 - 複数の前記第1の電極と、複数の前記第2の電極と、複数の前記第1の金属配線と、複数の前記第2の金属配線と、を備え、
前記各第1の電極と前記各第1の金属配線とがそれぞれ接合して、前記第1の接合部を形成し、
前記各第2の電極と前記各第2の金属配線とがそれぞれ接合して、前記第2の接合部を形成することを特徴とする請求項2に記載の光デバイス。 - 前記光素子に複数の前記薄膜ヒータが形成され、
前記各薄膜ヒータ上に、いずれかの前記第1の電極およびいずれかの前記第2の電極が形成されたことを特徴とする請求項2に記載の光デバイス。 - 前記金属材料はAuであることを特徴とする請求項1に記載の光デバイス。
- 前記接合部はマイクロバンプ構造を有することを特徴とする請求項1に記載の光デバイス。
- 前記基板と前記光素子とは、前記接合部により表面活性化接合で接合されたことを特徴とする請求項1に記載の光デバイス。
- 前記薄膜ヒータは透明電極で形成されたことを特徴とする請求項1に記載の光デバイス。
- 前記薄膜ヒータは、酸化インジウム(ITO)、または酸化亜鉛(ZnO)、酸化スズやこれらに不純物をドープした膜で形成されたことを特徴とする請求項8に記載の光デバイス。
- 前記光素子は、前記光導波路を導波する光を波長変換する波長変換素子であることを特徴とする請求項1に記載の光デバイス。
- 前記基板には、レーザダイオードと、前記レーザダイオードから出射された光を導波する光導波路と、前記光導波路を導波する光を波長変換する波長変換素子と、ファイバーブラッググレーティングとが前記光導波路の光軸方向に沿って設けられ、
熱伝導性の良好な材質からなり、前記基板が搭載されるベース基板を備え、
前記ベース基板は、一端側に位置する前記レーザダイオードが搭載された基板に接合されるとともに、前記波長変換素子から前記ファイバーブラッググレーティングまでの間には、前記基板との間に空間部が形成され、他端側に位置する前記ファイバーブラッググレーティングの端部が熱伝導性の良好な支持台を用いて前記基板を支持することを特徴とする請求項1に記載の光デバイス。 - 前記波長変換素子に設けられた第1の電極および第2の電極は、前記光導波路を挟み、前記波長変換素子の端部位置にそれぞれ位置することを特徴とする請求項10に記載の光デバイス。
- 前記基板には、前記第1の金属配線と、複数の前記第2の金属配線が設けられる部分に、所定高さの酸化膜を形成し、前記基板と前記波長変換素子との間の空間高さを高くしたことを特徴とする請求項2に記載の光デバイス。
- 前記基板には、前記第1の金属配線と、複数の前記第2の金属配線が設けられる部分に、基板の材料をポーラス状に加工した箇所を設け、熱伝導性を低くしたことを特徴とする請求項2に記載の光デバイス。
- 前記第1の電極および前記第2の電極を前記光導波路に沿って分割して複数設け、
分割された前記第1の電極間、および前記第2の電極間には、前記第1の電極および前記第2の電極と同じ材質からなり、かつ前記第1の電極および前記第2の電極と電気的に絶縁された侵入防止壁を設け、
前記侵入防止壁により、前記波長変換素子を前記基板に固着する際の接着剤の内部への侵入を防止したことを特徴とする請求項13に記載の光デバイス。 - 前記基板の下面には、貫通しない複数の溝を形成したことを特徴とする請求項1に記載の光デバイス。
- 前記基板の下面には、当該基板の縁部を残して凹部を開口形成したことを特徴とする請求項1に記載の光デバイス。
- 前記波長変換素子は、
前記光導波路に沿って平行に設けられるヒータと、
第1の電極および第2の電極から前記ヒータに接続される導出部を有し、
前記第1の電極と前記第2の電極と前記導出部は同一の材質によりなり、前記第1の電極と前記第2の電極を前記基板の第1の金属配線および第2の金属配線との接合に用いるとともに、前記ヒータの電極として兼用することを特徴とする請求項11に記載の光デバイス。
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US20120243825A1 (en) | 2012-09-27 |
CN102667578B (zh) | 2015-09-23 |
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