WO2005121855A1 - 光導波路型モジュール - Google Patents
光導波路型モジュール Download PDFInfo
- Publication number
- WO2005121855A1 WO2005121855A1 PCT/JP2005/010517 JP2005010517W WO2005121855A1 WO 2005121855 A1 WO2005121855 A1 WO 2005121855A1 JP 2005010517 W JP2005010517 W JP 2005010517W WO 2005121855 A1 WO2005121855 A1 WO 2005121855A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical waveguide
- light receiving
- receiving element
- light
- wiring board
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4228—Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements
- G02B6/4232—Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements using the surface tension of fluid solder to align the elements, e.g. solder bump techniques
Definitions
- the present invention relates to an optical waveguide module used for optical communication, particularly wavelength multiplex transmission.
- optical waveguide modules have been studied and commercialized as structures that can be made smaller and less expensive.
- FIG. 1 shows the structure of a first conventional example of an optical waveguide module (for example, disclosed in JP-A-2001-133666 and JP-A-2001-305365).
- a wavelength filter plate 102 having a filter film 103 and a light-shielding film 104 is fixed by a resin 106 to an end face of the optical waveguide substrate 100 on which the optical waveguide 101 is formed, on the light receiving element 107 side.
- the filter film 103 transmits light of a wavelength received by the light receiving element 107 and reflects light of other wavelengths.
- the light shielding film 104 of the wavelength filter plate 102 has an opening 105 through which light received by the light receiving element 107 passes.
- the wavelength filter plate 102 is positioned with respect to the optical waveguide substrate 100 such that the optical axis of the optical waveguide 101 and the opening 105 are aligned.
- This optical waveguide substrate 100 is fixed to a ceramic substrate 111 by solder 112.
- the light receiving element 107 is joined to a light receiving element carrier 109 by solder 110.
- the light receiving element carrier 109 is joined to the ceramic substrate 111 by solder 113.
- the position accuracy of the light receiving region 108 of the light receiving element 107 with respect to the outer shape of the light receiving element carrier 109 and the ceramics The relative positional accuracy between the optical waveguide substrate 100 and the light receiving element carrier 109 bonded to the optical substrate 111 determines the relative positional accuracy between the optical axis of the optical waveguide 101 and the optical axis of the light receiving element 107.
- a light emitting element (not shown) is mounted on the optical waveguide substrate 100.
- the light emitting element emits light having a wavelength different from the wavelength received by the light receiving element 107 and propagates the light through the optical waveguide 101.
- Light emitted from the light emitting element and propagated through the optical waveguide 101 is almost reflected by the filter film 103 of the wavelength filter plate 102. Therefore, unnecessary light incident on the light receiving element 107 can be reduced. Further, a small amount of unnecessary light generated by leakage light emitted from the light emitting element and not incident on the optical waveguide 101 propagates through the optical waveguide substrate 100 and passes through the filter film 103. Propagation to the light receiving element 107 can be prevented.
- FIG. 2 shows the structure of a second conventional example of an optical waveguide module (for example, see Japanese Unexamined Patent Application Publication No.
- a wavelength filter plate 123 is inserted in the middle of the optical waveguide 121 formed on the optical waveguide substrate 120.
- the wavelength filter plate 123 transmits light of the first wavelength that is received and emitted by the light receiving element 125 and the light emitting element 126, and reflects light of other wavelengths.
- Only the light of wavelength ⁇ 1 passes through the wavelength filter plate 123, and the light of other wavelengths is reflected by the wavelength filter plate 123 and guided to the reflection port 124.
- the optical waveguide 121 is branched into two so as to be optically coupled to the light receiving element 125 and the light emitting element 126 at the end of the wavelength filter plate 123.
- the light receiving element 125 and the light emitting element 126 are mounted on the optical waveguide substrate 120 such that the optical axes of the two branched optical waveguides 121 coincide with each other. Leakage light emitted from the light emitting element 126 and not incident on the optical waveguide 121 propagates through the optical waveguide 121 but is blocked at the light shielding groove 127, so that leakage light from the light emitting element 126 propagates to the reflection port 124. Can be prevented.
- the above-mentioned conventional optical waveguide module has the following problems.
- the relative positional accuracy between the optical axis of the light receiving element 107 and the optical axis of the optical waveguide 101 depends on the light receiving area 108 of the light receiving element 107 with respect to the outer shape of the light receiving element carrier 109.
- Positional accuracy and light reception with optical waveguide substrate 100 fixed to ceramic substrate 111 It is determined by the positional accuracy of the element carrier 109.
- the wavelength filter plate 102 needs to be accurately fixed so that the light transmitted from the optical waveguide 101 and transmitted through the filter film 103 is not blocked and the position of the opening 105 is matched with the light.
- the optical waveguide module used for wavelength multiplex transmission must be assembled so that the optical axis deviation is small (error ⁇ 5 to about 10 xm).
- At least three high-precision assembling steps (the step of attaching the light receiving element 107 to the light receiving element carrier 109 and the step of fixing the optical waveguide substrate 100 and the light receiving element carrier 109 to the ceramic substrate 111) And a step of attaching the wavelength filter plate 102 to the optical waveguide substrate 100), and therefore, an expensive high-precision assembly device is required.
- two wiring forming steps (a step of forming electric wiring between the light receiving element 107 and the light receiving element carrier 109 and a step of forming electric wiring between the light receiving element carrier 109 and the ceramic substrate 111) are required. is there.
- the edge-incident type light receiving element 125 is more expensive than a general plane-illuminated light-receiving element, and the types of usable products are extremely small at present.
- the optical waveguides 100 and 121 and the light receiving elements 107 and 125 must be connected to each other unless the assembling step and the wiring forming step are completed.
- the force at which the connection is appropriate, and whether or not (satisfies the desired performance) cannot be determined. Therefore, a general active alignment method, such as a general active alignment method, is required for the optical axis alignment process when assembling the optical module. That is, while emitting light from the optical waveguide to the light receiving element, a current is applied to the light receiving element, and while monitoring the optical coupling efficiency, the relative positions of the two are adjusted so that the light receiving element and the optical waveguide have the best positional relationship. There is a problem that a method of fixing the two after adjustment cannot be adopted. Disclosure of the invention
- An object of the present invention is to solve the above-mentioned problems and to provide a small-sized optical waveguide type module which is easy to mount and assemble and has low manufacturing cost.
- the present invention relates to a wiring board having electric wiring formed on at least one surface, a light receiving element mounted on the wiring board such that a light receiving region faces the surface having the electric wiring formed thereon,
- the base material of the wiring board transmits light of a wavelength received by the light receiving element.
- a wavelength filter that reflects light other than the wavelength received by the light receiving element is disposed between the base material of the wiring board and the optical waveguide.
- An opening larger than the outer shape of the core of the optical waveguide is formed at a position facing the light receiving region, and the end of the optical waveguide on the optical waveguide substrate and the light receiving region of the light receiving element are optically connected via a wavelength filter and the opening. Connected to The door and Features.
- the light receiving element is mounted on the wiring board, and the wiring board is directly attached to the end face of the optical waveguide board. Therefore, as long as the relative positional relationship among the three members of the light receiving element, the wiring board, and the optical waveguide board is high, the mounting process of other components does not require much high precision. Therefore, compared with the conventional configuration in which the light receiving element and the optical waveguide substrate are independently mounted on the substrate, the number of steps requiring strict accuracy is reduced.
- the wavelength filter may be in the form of a film formed on the surface of the wiring board opposite to the surface on which the light receiving element is mounted. In that case, the number of parts is small, the configuration is simple, and the mounting work is easy.
- the wavelength filter may be in a plate shape disposed between the surface of the wiring substrate opposite to the surface on which the light receiving element is mounted and the optical waveguide substrate. In that case, it is generally manufactured and used without the need to prepare a special wiring board on which a film-like wavelength filter is formed.
- the plate-shaped wavelength filter that is used can be arbitrarily selected and used, so that it is efficient, the production cost can be kept low, and it is practical.
- the opening of the electric wiring is formed at a position facing the light receiving area over a wider range than the outer shape of the light receiving area.
- the plate-shaped wavelength filter blocks light unnecessary to be received by the light receiving element.
- An opening larger than the outer shape of the core of the optical waveguide may be formed at a position of the light shielding film facing the light receiving region of the light receiving element. According to this configuration, the relative positional accuracy in the step of attaching the light receiving element and the wiring board may be further reduced, so that the manufacturing is further facilitated and the manufacturing cost is reduced.
- the opening of the electric wiring and the opening formed in the base material may communicate with each other to form a hole penetrating the wiring board. In this case, it is easier to manufacture the through hole than in the case where the opening is formed only in the electric wiring.
- the wiring substrate may be formed using a flexible dielectric as a base material.
- the wiring board is bent at a portion other than the portion where the light receiving element is mounted, and the surface of a part of the wiring board is substantially parallel to the optical axis of the optical waveguide.
- such a configuration is often desired in which the optical axis of the optical waveguide is often parallel to the wiring board at the end of the optical module.
- a flexible dielectric as the base material of the wiring board and bending the wiring board on which the optical element is mounted halfway, the optical axis of the optical waveguide and the wiring board at the end of the optical module are parallel. Configuration can be realized.
- flexible wiring boards based on polymers and the like are widely used in many electronic devices and are very inexpensive boards. By using such wiring boards, inexpensive modules have been realized. There are also benefits.
- the integrated circuit chip may be mounted on the wiring board in the vicinity of the light receiving element.
- a flexible wiring board based on a polymer or the like is suitable for mounting such an integrated circuit.
- the number of steps requiring strictly high-precision assembly can be reduced as compared with the related art, and the wiring step for the light receiving element is not required. Therefore, the manufacturing is simple and the manufacturing cost can be reduced. Also, since the wiring substrate is directly fixed to the optical waveguide substrate, expensive ceramics are used. The components such as the backing substrate and the light receiving element carrier are not required, and the manufacturing cost can be reduced because the number of components is small. Further, in the optical waveguide module of the present invention, a general and inexpensive planar incident type light receiving element can be used. Since an expensive optical waveguide substrate does not require a space for mounting a light receiving element, the cost can be reduced by reducing the size of the optical waveguide substrate used.
- the optical waveguide module of the present invention electric wiring is completed when the light receiving element is mounted on the wiring board. Therefore, before bonding to the optical waveguide board, the characteristic inspection of the light receiving element is performed to eliminate defective products. can do. Therefore, since only a good light receiving element needs to be joined to the optical waveguide substrate, the expensive optical waveguide substrate can be effectively used without wasting. Furthermore, since the active alignment method can be used as a method for matching the optical axis of the optical waveguide with the optical axis of the light receiving element, it is possible to improve the optical coupling efficiency.
- the optical waveguide substrate and the wiring substrate can be fixed to the same substrate, and a simple optical module structure can be realized.
- FIG. 1 is a cross-sectional view showing the structure of a first conventional example of an optical waveguide module.
- FIG. 2 is a perspective view showing a structure of a second conventional example of an optical waveguide module.
- FIG. 3 is a cross-sectional view showing an optical waveguide module according to the first embodiment of the present invention.
- FIG. 4 is a plan view of an example in which the optical waveguide module shown in FIG. 3 is applied to a transmission / reception module.
- FIG. 5 is a cross-sectional view illustrating an optical waveguide module according to a second embodiment of the present invention.
- FIG. 6 is a cross-sectional view showing a modification of the optical waveguide module according to the second embodiment of the present invention.
- FIG. 7 is a cross-sectional view showing an optical waveguide module according to a third embodiment of the present invention.
- FIG. 8 is a sectional view showing an optical waveguide module according to a fourth embodiment of the present invention.
- FIG. 3 is a diagram showing an optical coupling structure between an optical waveguide and a light receiving element of the optical waveguide module according to the first embodiment of the present invention, which is cut along a plane passing through an optical axis of a core of the optical waveguide. It is sectional drawing.
- a wiring board 7 having a thickness of 50 ⁇ m is composed of a base 5, surface electric wiring 4, and a filter film (film-like wavelength filter) 6.
- the base material 5 has a property of transmitting light having a wavelength ⁇ ⁇ (for example, 1.55 zm) received by the light receiving element 9.
- the filter film 6 is formed on the back side of the surface electrical wiring 4, and has a property of transmitting light of wavelength ⁇ 1 received by the light receiving element 9 and reflecting light of other wavelengths.
- the surface electrical wiring 4 is formed with an opening 8 having a diameter of 100 zm which is larger than the core 3 of the optical waveguide.
- a plane-incidence type light receiving element 9 is mounted on the surface electric wiring 4 by flip-chip mounting using gold stud bumps 11 having a height of about 20 zm.
- the light receiving area 10 of the light receiving element 9 faces the wiring board 7.
- the mounting accuracy of the light receiving element 9 with respect to the wiring board 7 is such that the light receiving area 10 of the light receiving element 9 having a diameter of 80 ⁇ ⁇ ⁇ ⁇ ⁇ falls within the range of the opening 8 having a diameter of 100 / im, specifically, an error of about ⁇ 10 ⁇ . Is good.
- the surface of the wiring substrate 7 on the filter film 8 side is fixed to the end surface of the optical waveguide substrate 1 with a resin 12.
- the optical axis of the core 3 of the optical waveguide 2 coincides with the center of the light receiving area 10 of the light receiving element 9 with an error of ⁇ 5 to: 10 / im.
- the base material 5 of the wiring board 7 is made of a flexible material such as a polymer. Therefore, as shown in FIG. 3, the mounting portion of the light receiving element 9 of the wiring board 7 is fixed to the end face of the optical waveguide board 1 by the resin 12 as described above, and the bent portion 13 is bent substantially at a right angle.
- the substrate region 16 of 7 is fixed together with the optical waveguide substrate 1 on the substrate 14 by the resin 15.
- a signal amplification IC (integrated circuit chip) 17 for amplifying a light receiving signal of the light receiving element 9 is mounted on the substrate region 16 by using a bump 18.
- the light receiving element 9 is fixed to the wiring board 7 by the bumps 11, and then the wiring board 7 and the optical waveguide board 1 are aligned and fixed to each other. At this time, a current is caused to flow through the light receiving element 9 while emitting light from the optical waveguide 2 to the light receiving element 9, and while monitoring the optical coupling efficiency, both light receiving elements 9 and the optical waveguide 2 are placed in the best positional relationship.
- the wiring substrate 7 is , A so-called active alignment method. Therefore, the positioning and fixing of the light receiving element 9 and the optical waveguide 2 can be performed easily and with high precision.
- the light receiving element 9 can be fixed to the wiring board 7 after the wiring board 7 and the optical waveguide board 1 are aligned and fixed.
- connection with other members is performed immediately and the connection to the substrate region 16 of a component such as the signal amplification IC 17 starts. Can be easily and reliably mounted.
- the mounting position of the signal amplification IC 17 may be a position parallel to the light receiving element 9 (a position facing the end face of the optical waveguide substrate 1). In that case, by bringing the signal amplification IC 17 close to the light receiving element 9, even a weak electric output signal of the light receiving element can be transmitted to the signal amplifier IC 17 and amplified.
- the mounting of the signal amplification IC 17 may be performed before fixing the substrate region 16 to the substrate 14 or may be performed after fixing the substrate region 16 to the substrate 14.
- the number of assembling steps for forming an optical coupling structure between the optical waveguide 2 and the light receiving element 9 can be reduced as compared with the related art, and in particular, the number of assembling steps requiring high accuracy is reduced. Become. Therefore, manufacturing becomes very easy. Specifically, as long as the relative positional relationship among the three members of the light receiving element 9, the wiring substrate 7, and the optical waveguide substrate 1 is high, not so high accuracy is required for the mounting process of other components.
- the light receiving element 107 and the optical waveguide substrate 100 are independently mounted on the substrate 111, and the relative positional relationship between the light receiving element 107, the light receiving element carrier 109, the optical waveguide substrate 100, and the substrate 111 is determined. Each must have high precision. In this embodiment, the number of steps requiring strict accuracy is reduced as compared with the conventional configuration.
- the number of components that does not require the provision of a wavelength filter plate separately from the wiring board is reduced as compared with the conventional case. Furthermore, it is not necessary to use expensive materials (ceramics, etc.) that were required in the past for higher precision, and materials that are cheaper than before can be used. Therefore, manufacturing costs can be reduced.
- a general and inexpensive light-receiving element 9 of a plane incidence type can be used.
- the cost can be reduced by reducing the size of the optical waveguide substrate 1 to be used.
- FIG. 4 shows a case where the optical coupling structure between the optical waveguide and the light receiving element of the optical waveguide module according to the first embodiment of the present invention is applied to an optical waveguide type transmission / reception module used for wavelength division multiplexing transmission. It is a top view of the example which did.
- two optical waveguides 2 for the transmission port 20 and the common port 21 are formed on the optical waveguide substrate 1.
- the two optical waveguides 2 intersect with each other at an end on the light receiving element 9 side at an angle of 10 ° to 30 °.
- a light emitting element 19 and an optical fiber 22 are mounted on an end of the optical waveguide substrate 1 opposite to the light receiving element 9 side.
- the optical axis of the core 3 of the optical waveguide 2 for the transmission port 20 and the optical axis of the light emitting element 19 coincide with an error of about ⁇ 1 ⁇ m.
- the optical axis of the core 3 of the optical waveguide 2 for the common port 21 and the optical axis of the optical fiber 22 coincide with an error of about ⁇ 2 ⁇ m.
- the light having a wavelength of 1 2 (for example, 1.3 zm) emitted from the light emitting element 19 propagates through the optical waveguide 2 for the transmission port 20 and is reflected by the filter film 6, and further, the optical waveguide for the common port 21.
- the light propagates through the waveguide 2 and is guided to the optical fiber 22 and transmitted to the outside of the optical waveguide module.
- light of wavelength 1 transmitted from the outside by the optical fiber 22 propagates through the optical waveguide 2 for the common port 21, passes through the filter film 6, and is guided to the light receiving region 10 of the light receiving element 9.
- the light emitted from the light emitting element 19 includes a small amount of light having the wavelength ⁇ 1, and propagates through the optical waveguide 2 for the transmission port 20 and passes through the filter film 6.
- the optical axis of the optical waveguide 2 for the transmission port 20 and the optical axis of the optical waveguide 2 for the common port 21 are mutually 10.
- the center of the light receiving area 10 of the light receiving element 9 and the opening 8 are arranged so as to face the optical axis of the optical waveguide 2 for the common port 21. Therefore, light transmitted through the filter film 6 from the optical waveguide 2 for the transmission port 20 is blocked by the surface electric wiring 4 and does not enter the light receiving region 10. Further, unnecessary light that is irregularly reflected in the optical waveguide module is also blocked by the surface electrical wiring 4 and is prevented from entering the light receiving element 9.
- FIG. 5 is a diagram showing an optical coupling structure between an optical waveguide and a light receiving element of the optical waveguide module according to the second embodiment of the present invention, which is cut along a plane passing through an optical axis of a core of the optical waveguide. It is sectional drawing.
- a wiring board 32 having a thickness of 50 ⁇ m is composed of a base material 31 and surface electric wiring 30. It is made.
- the base material 31 has transparency to light having a wavelength ⁇ (for example, 1.55 / im) received by the light receiving element 9.
- An opening 33 having a diameter of 100 ⁇ larger than the core 3 of the optical waveguide 2 is formed in the surface electric wiring 30 of the wiring board 32.
- a plane-incidence type light receiving element 9 is flip-chip mounted on the surface electric wiring 30 by using a gold stud bump 11 having a height of about 20 zm.
- the light receiving area 10 of the light receiving element 9 faces the wiring board 32.
- the mounting accuracy of the light receiving element 9 with respect to the wiring board 32 is such that the light receiving area 10 of the light receiving element 9 having a diameter of 80 ⁇ m falls within the range of the opening 33 having a diameter of 100 ⁇ m, specifically, an error of about ⁇ 10 zm. good.
- a wavelength filter plate (plate-like wavelength filter) 34 having a filter film 35 is fixed to an end face of the optical waveguide substrate 1 with a resin 36.
- the filter film 35 has a characteristic of transmitting light of wavelength 11 received by the light receiving element 9 and reflecting light of other wavelengths.
- the surface of the wiring board 32 opposite to the surface on which the light receiving element 9 is mounted is fixed to the wavelength filter plate 34 by a resin 37.
- the optical axis of the core 3 of the optical waveguide 2 coincides with the center of the light receiving region 10 of the light receiving element 9 with an error of ⁇ 5 to: 10 / im.
- the other configuration is the same as that of the first embodiment, and the description is omitted.
- the number of assembling steps for configuring the optical coupling structure between the optical waveguide 2 and the light receiving element 9 is not much different from the conventional one. However, it is not necessary to fix the wavelength filter plate 34 to the waveguide substrate 1 with high accuracy. Further, for the same reason as in the first embodiment, it is possible to reduce the number of steps requiring high-precision assembly. They reduce manufacturing costs.
- the wavelength filter plate 34 that has been generally manufactured and used can be arbitrarily selected and used, so that it is efficient, the manufacturing cost can be reduced, and It is a target.
- FIG. 6 shows a modification of the second embodiment.
- a double-sided wiring board 39 including a base 31, a front surface electrical wiring 30, and a back wiring board 38 may be used, and the back wiring board 38 may be provided with a pinhole 38a.
- FIG. 7 is a diagram showing an optical coupling structure between an optical waveguide and a light receiving element of an optical waveguide module according to a third embodiment of the present invention, which is cut along a plane passing through an optical axis of a core of the optical waveguide. It is sectional drawing.
- a wiring board 42 having a thickness of 50 ⁇ m is composed of a base material 41 and surface electric wiring 40. It is made.
- the base material 41 has transparency for light of a wavelength ⁇ (for example, 1.55 / im) received by the light receiving element 9.
- the plane-illuminated light receiving element 9 is flip-chip mounted on the surface electric wiring 40 by using gold stud bumps 11 having a height of about 20 am.
- the light receiving area 10 of the light receiving element 9 faces the wiring board 42.
- the mounting accuracy of the light receiving element 9 with respect to the wiring board 42 may be such that the light receiving area 10 having a diameter of 80 zm of the light receiving element 9 falls within the range of the opening 43 having a diameter of 200 zm, specifically, an error of about ⁇ 60 xm.
- a wavelength filter plate (plate-like wavelength filter) 44 having a filter film 45 and a light-shielding film 46 is fixed to an end face of the optical waveguide substrate 1 with a resin 48.
- the finole film 45 has the property of transmitting light of wavelength ⁇ 1 received by the light receiving element 9 and reflecting light of other wavelengths.
- an opening 47 having a diameter of 100 zm larger than the core 3 of the optical waveguide is formed.
- the surface of the wiring board 42 opposite to the surface on which the light receiving element 9 is mounted is fixed to the wavelength filter plate 44 by a resin 49.
- the optical axis of the core 3 of the optical waveguide coincides with the center of the light receiving region 10 of the light receiving element 9 with an error of ⁇ 5 to: 10 / im. Note that other configurations are the same as those of the first and second embodiments, and thus description thereof is omitted.
- the number of assembly steps for forming an optical coupling structure between the optical waveguide and the light receiving element is not much different from the conventional one. However, it is not necessary to fix the light receiving element 9 to the wiring board 42 with high accuracy. Further, for the same reason as in the first embodiment, it is possible to reduce the number of steps requiring high-precision assembly. They reduce manufacturing costs.
- FIG. 8 is a diagram showing an optical coupling structure between an optical waveguide and a light receiving element of an optical waveguide module according to a fourth embodiment of the present invention, which is cut along a plane passing through an optical axis of a core of the optical waveguide. It is sectional drawing.
- a wiring board 52 having a thickness of 50 ⁇ m is composed of the base material 51 and the surface electric wiring 50.
- the base material 41 has a light shielding property for light having a wavelength ⁇ ⁇ (for example, 1.55 zm) received by the light receiving element 9.
- a through hole 53 having a diameter of 100 zm larger than the core 3 of the optical waveguide is formed.
- the through-hole 53 is formed by communication between an opening provided in the surface electric wiring 50 and an opening provided in the base material 51.
- the mounting accuracy of the light receiving element 9 with respect to the wiring board 52 may be such that the light receiving area 10 having a diameter of 80 zm of the light receiving element 9 falls within the range of the through hole 53 having a diameter of 100 zm, specifically, an error of about ⁇ 10 zm.
- a wavelength filter plate (plate-shaped wavelength filter) 54 having a filter film 55 is fixed to an end surface of the optical waveguide substrate 1 with a resin 56.
- the filter film 55 has a characteristic of transmitting light of wavelength 11 received by the light receiving element 9 and reflecting light of other wavelengths.
- the surface of the wiring board 52 opposite to the surface on which the light receiving element 9 is mounted is fixed to the wavelength filter plate 54 by a resin 57.
- the optical axis of the core 3 of the optical waveguide coincides with the center of the light receiving region 10 of the light receiving element 9 with an error of ⁇ 5 to: 10 zm.
- the number of assembling steps for forming an optical coupling structure between the optical waveguide 2 and the light receiving element 9 is not much different from the conventional one.
- the through hole 53 is relatively large, it is not necessary to fix the wavelength filter plate 54 to the waveguide substrate 1 with high accuracy. Further, for the same reason as in the first embodiment, it is possible to reduce the number of steps requiring high-precision assembly. As a result, manufacturing costs are reduced.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
- Light Receiving Elements (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006514550A JPWO2005121855A1 (ja) | 2004-06-09 | 2005-06-08 | 光導波路型モジュール |
US11/628,848 US7403676B2 (en) | 2004-06-09 | 2005-06-08 | Optical waveguide module |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-171551 | 2004-06-09 | ||
JP2004171551 | 2004-06-09 |
Publications (1)
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WO2005121855A1 true WO2005121855A1 (ja) | 2005-12-22 |
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PCT/JP2005/010517 WO2005121855A1 (ja) | 2004-06-09 | 2005-06-08 | 光導波路型モジュール |
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US (1) | US7403676B2 (ja) |
JP (1) | JPWO2005121855A1 (ja) |
CN (1) | CN100492079C (ja) |
WO (1) | WO2005121855A1 (ja) |
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JP2010243770A (ja) * | 2009-04-06 | 2010-10-28 | Nitto Denko Corp | 光電気混載モジュールの製造方法およびそれによって得られた光電気混載モジュール |
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JP2008139492A (ja) * | 2006-11-30 | 2008-06-19 | Fujitsu Ltd | 光モジュール |
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JP2010243770A (ja) * | 2009-04-06 | 2010-10-28 | Nitto Denko Corp | 光電気混載モジュールの製造方法およびそれによって得られた光電気混載モジュール |
Also Published As
Publication number | Publication date |
---|---|
US7403676B2 (en) | 2008-07-22 |
CN100492079C (zh) | 2009-05-27 |
JPWO2005121855A1 (ja) | 2008-04-10 |
CN101002123A (zh) | 2007-07-18 |
US20080037927A1 (en) | 2008-02-14 |
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