WO2007116998A1 - 光ケーブルモジュール - Google Patents
光ケーブルモジュール Download PDFInfo
- Publication number
- WO2007116998A1 WO2007116998A1 PCT/JP2007/057836 JP2007057836W WO2007116998A1 WO 2007116998 A1 WO2007116998 A1 WO 2007116998A1 JP 2007057836 W JP2007057836 W JP 2007057836W WO 2007116998 A1 WO2007116998 A1 WO 2007116998A1
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- WIPO (PCT)
- Prior art keywords
- optical waveguide
- optical
- light emitting
- light
- waveguide
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 361
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
Definitions
- the present invention relates to an optical module for optical data transmission, and more particularly to an optical cable module having flexibility and a method of manufacturing the same.
- optical communication networks capable of high-speed, large-capacity data communication have been expanded. In the future, this optical communication network is expected to be installed in consumer products.
- optical data transmission cable optical cable
- this optical cable it is desirable to use a film optical waveguide in consideration of flexibility.
- An optical waveguide is formed of a core having a large refractive index and a cladding having a small refractive index provided in contact with the periphery of the core, and an optical signal incident on the core is completely formed at the boundary between the core and the cladding. It propagates while repeating reflection.
- the film optical waveguide has flexibility because the core and cladding become flexible polymer material.
- the film light guide having this flexibility As an optical cable, it is necessary to align and optically couple with a photoelectric conversion element (light receiving / emitting element).
- the light emitting / receiving element converts an electric signal into an optical signal and transmits it, receives an optical signal and converts it into an electric signal, and uses a light emitting element on the light input side and a light receiving element on the light output side.
- This alignment requires precision because it affects the light coupling efficiency.
- FIG. 16 shows a configuration example of an optical cable module formed by optically coupling a film light guide and a light emitting and receiving element.
- the optical cable module 100 shown in FIG. 16 is configured to include an optical waveguide 101, a light emitting / receiving element 102, and a support substrate 103 at the light incident side or the light emitting side end portion thereof.
- the optical waveguide 101 is fixed to the supporting substrate 103 by adhesion or the like near its end, and the relative positional relationship between the end of the optical waveguide 101 and the light emitting / receiving element 102 is in a fixed state.
- the supporting substrate 103 has a level difference such that the mounting surface of the light emitting / receiving element 102 and the fixing surface (adhesive surface) of the optical waveguide 101 are different from each other.
- the end face of the optical waveguide 101 is not perpendicular to the optical axis (the central axis along the longitudinal direction of the core portion), and is obliquely cut to form an optical path conversion mirror.
- the signal light transmitted through the core portion of the optical waveguide 101 is reflected by the optical path conversion mirror, and the traveling direction is changed to be emitted toward the light emitting / receiving element 102.
- Patent documents 1 and 2 disclose a configuration in which a resin having a high refractive index is filled in a gap between a light emitting element and an optical waveguide, and the resin is used to adhere and fix the optical waveguide. In this configuration, undesired interface reflection is suppressed by the above-mentioned resin layer, and the light coupling efficiency can be improved.
- Patent Document 1 Japanese Patent Publication No. 2000-214351 (publication date: August 2000, 4th)
- Patent Document 2 Japanese Patent Publication No. 2000-9968 (Publication date: 14 January 2000)
- Patent Document 3 Japanese Patent Publication No. 2004-233687 (publication date: August 19, 2004)
- the distal end portion of the optical waveguide 101 protrudes toward the optical axis direction with respect to the support region of the optical waveguide 101 in the support substrate 103 while applying a force.
- the optical waveguide 101 is a highly flexible film optical waveguide, it is possible that the stagnation as shown in FIG. There is sex.
- the optical signal from the light emitting element 102 can not be reliably applied to the optical path conversion mirror of the optical waveguide 101 on the light input side, There is a possibility that an optical signal can not be introduced to the core portion of the waveguide 101.
- the optical signal output from the optical waveguide 101 does not reach the center of the light receiving element 102, which causes an optical loss in optical coupling between the optical waveguide and the light receiving and emitting element. That is, at the tip of the optical waveguide 101 on both the light input side and the light output side. If excessive stagnation occurs, transmission failure of the optical signal occurs.
- the present invention has been made in view of the above problems, and an object thereof is to provide an optical cable module capable of achieving stable coupling between an optical waveguide and a light emitting and receiving element.
- an optical cable module comprises an optical waveguide having a core part surrounded by a cladding layer and a light emitting / receiving element on a supporting substrate
- the optical waveguide comprises an optical path conversion mirror for converting the direction of the optical path of the optical signal transmitted through the core portion, and the emission surface of the light in the optical waveguide or the incident surface of the light to the optical waveguide is
- the waveguide is disposed so as to face the light receiving surface or the light emitting surface of the light emitting / receiving element, and from the end of the support surface supporting the optical waveguide on the support substrate to the center of the optical path conversion mirror in the core portion of the optical waveguide
- the above-mentioned light emitting / receiving element means a light emitting element on the light incident side to the optical waveguide and a light receiving element on the light emitting side of the optical waveguide.
- the load w per unit length of the optical waveguide is Although it is determined by the mass per square) X (gravity acceleration + maximum usable acceleration value), the allowable angle ⁇ max of the waveguide tip drooping angle ⁇ is about 1.0 °. Therefore, in the optical cable module, the waveguide protrusion amount L is
- the waveguide tip can be suppressed within an allowable angle of 1.0 °, and the amount of stagnation generated in the optical waveguide is a transmission failure of the optical signal. Not allowed, can be limited to a degree.
- another optical cable module includes an optical waveguide having a core part surrounded by a cladding layer and a light emitting / receiving element on a supporting substrate.
- a cable module wherein an exit surface of light in the optical waveguide or an incident surface of light to the optical waveguide is disposed to face a light receiving surface or a light emitting surface of the light emitting / receiving element,
- the waveguide is a support surface of the optical waveguide on the support substrate, and the end on which the light input and output surface of the optical waveguide exists and the protrusion of the optical waveguide on the end and
- a reinforcing member is provided on the surface on the side where there is no light or light input / output surface.
- the reinforcing member is disposed on the upper surface (the surface on which the light input / output surface does not exist) or the lower surface (the surface on which the light input / output surface exists) of the optical waveguide.
- the generation of stagnation in the optical waveguide can be suppressed, and the amount of stagnation generated in the optical waveguide can be limited to the extent that transmission defects of the optical signal are not generated.
- still another optical cable module is an optical cable comprising an optical waveguide having a core part surrounded by a cladding layer and a light emitting / receiving element on a supporting substrate.
- the optical waveguide includes an optical path conversion mirror for converting the direction of an optical path of an optical signal transmitted through the core portion, and a light emitting surface of the optical waveguide or a light to the optical waveguide Is disposed so as to face the light receiving surface or the light emitting surface of the light emitting / receiving element, and the light emitting / receiving element is sealed with a sealing resin, and the light receiving surface or the light emitting surface of the light emitting / receiving element An air gap is provided between the surface of the sealing resin on the surface and the output surface or the incident surface of the optical waveguide, and the end force of the supporting surface of the supporting substrate for supporting the optical waveguide.
- Core of waveguide In the department When the waveguide projection amount L up to the center of the optical path conversion mirror and the width of the fillet generated in the sealing resin in the optical
- the fillet fillet means that the applied sealing resin before curing swells due to surface tension at the interface with the support substrate (interface perpendicular to the optical axis of the optical waveguide), and the surface receives and emits light. It refers to a portion that is hardened without being parallel to the light emitting and receiving surface of the device.
- the fillet width F of the sealing resin refers to the width in the direction of the optical axis of the optical waveguide in a region where the angle between the surface of the sealing resin and the light emitting / receiving surface of the light emitting / receiving element is 5 ° or more.
- the fillet may be applied to the area on the light emitting and receiving surface of the light emitting and receiving element to adversely affect the transmission of the optical signal (such as a reduction in transmission efficiency). be able to.
- FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view showing a drooping of an optical waveguide generated in an optical cable module.
- FIG. 2 is a cross-sectional view showing an essential configuration of the optical cable module.
- FIG. 3 shows an embodiment of the present invention, and is a cross-sectional view showing an essential configuration of an optical cable module.
- FIG. 4 shows an embodiment of the present invention, and is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 5 shows an embodiment of the present invention and is a cross-sectional view showing an example of attachment of a reinforcing member in an optical waveguide.
- FIG. 6 shows an embodiment of the present invention, and is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 7 shows an embodiment of the present invention, and is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 8 shows an embodiment of the present invention, and is a cross-sectional view showing an essential configuration of an optical cable module.
- FIG. 9 is a view showing a state in which sealing resin is applied to the support surface of the optical waveguide in the optical cable module.
- FIG. 10 which shows an embodiment of the present invention, is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 11 is a cross-sectional view showing a main part configuration of an optical cable module, showing an embodiment of the present invention.
- FIG. 12 shows an embodiment of the present invention, and is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 13 shows an embodiment of the present invention and is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 14 shows an embodiment of the present invention and is a cross-sectional view showing the main configuration of an optical cable module.
- FIG. 15 is a view showing a state of a sealing resin at the time of curing in the optical cable module.
- FIG. 16 is a cross-sectional view showing the main configuration of a conventional optical cable module.
- FIG. 17 is a view showing the drooping of the optical waveguide in the conventional optical cable module.
- FIG. 18 is a cross-sectional view showing an example of a structure of an optical cable module in which an optical waveguide is mounted on a light emitting / receiving element sealed.
- FIG. 19 is a cross-sectional view showing a structural example of an optical cable module in which an optical waveguide is mounted on a light emitting / receiving element sealed.
- FIG. 20 (a) is a cross-sectional view showing a structural example of an optical cable module in which an optical waveguide is mounted after sealing a light emitting / receiving element.
- FIG. 20 (b) is a cross-sectional view showing a structural example of an optical cable module in which an optical waveguide is mounted on a light emitting / receiving element sealed.
- the optical cable module 1 shown in FIG. 2 includes an optical waveguide 10, a light emitting / receiving element 11, a sealing resin 12 and a support substrate 13 roughly in the vicinity of the end thereof.
- the end of the optical waveguide 10 is fixed to the support substrate 13 by bonding or the like, and the relative positional relationship between the end of the optical waveguide 10 and the light emitting / receiving element 11 is fixed.
- the optical cable module 1 may be provided with an electrical wiring and an electrical connection portion in order to facilitate extraction of the electrical signal output from the light emitting / receiving element 11.
- the light emitting / receiving element 11 is a light emitting element such as a laser diode at the light incident side end to the light waveguide 10 and is a light receiving element such as a photodiode at the light emitting side end from the optical waveguide 10.
- the optical waveguide 10 is composed of a core portion 10A, an upper cladding layer 10B, and a lower cladding layer IOC. That is, the optical waveguide 10 has a laminated structure in which the core portion 10A is sandwiched between the upper cladding layer 10B and the lower cladding layer 10C.
- the optical signal transmitted by the optical waveguide 10 travels in the core portion 10A while being reflected at the interface between the core portion 10A and the upper cladding layer 10B or at the interface between the core portion 10A and the lower cladding layer 10C. .
- the longitudinal direction (optical axis direction) of the optical waveguide 10 is taken as the X axis direction, the lamination direction of the core 10A, the upper cladding layer 10B, and the lower cladding layer 10C.
- the Y-axis direction also coincides with the normal line direction of the mounting surface of the light emitting / receiving element 11 on the support substrate 13.
- the end face of the optical waveguide 10 is not perpendicular to the optical axis (X-axis), and is obliquely cut to form an optical path conversion mirror 10D. Specifically, the end face of the optical waveguide 10 is perpendicular to the XY plane and inclined so as to form an angle 0 (0 ⁇ 90 °) with respect to the X axis.
- the signal light transmitted through the core section 10 is reflected by the optical path conversion mirror 10D, and its traveling direction is changed to make the optical path conversion mirror 10 D Emitting surface force is emitted toward the light receiving element 11.
- a signal emitted from the light emitting element 11 is incident from the incident surface of the optical path conversion mirror 10D, and then reflected by the optical path conversion mirror 10D to change its traveling direction to change the core. Part 10 is transmitted.
- the light exit surface (or entrance surface) of the optical waveguide 10 is provided with an optical path conversion mirror 10D, so that the lower cladding layer 10C (the upper cladding layer 10B may be And the light receiving surface (or light emitting surface) of the light emitting / receiving element 11 is disposed to face the light emitting surface (or light incident surface) of the optical waveguide 10.
- the inclination angle ⁇ of the light path conversion mirror 10D is usually set at 45 ° so that the alignment between the light path conversion mirror 10D and the light emitting / receiving element 11 is easy.
- the inclination angle ⁇ of the light path conversion mirror 10D is not limited to 45 °. If the inclination angle ⁇ of the light path conversion mirror 10D is smaller than 45 °, the light emitting / receiving element 11 is sealed. It is easy to arrange in the area where the fillet of fat 12 does not occur, which is preferable.
- the inclination angle ⁇ of the optical path conversion mirror 10D is preferably set in the range of 35 ° to 50 °.
- the optical path conversion mirror may have a mirror part externally attached to the end of the optical waveguide 10.
- the sealing resin 12 One of the roles of the sealing resin 12 is to protect the light emitting / receiving element 11 from dust and moisture by sealing the light emitting / receiving element 11 and to improve the reliability of the optical cable module 1. Besides, the sealing resin 12 also has the function of preventing the diffusion of the optical signal transmitted between the optical waveguide 10 and the light emitting / receiving element 11 and suppressing the optical loss due to the diffusion of the optical signal.
- transparent resins such as epoxy resins, acrylic resins, silicone resins and urethane resins having a high refractive index can be suitably used. Further, the refractive index of the sealing resin 12 is larger than that of air, and it is effective if it is a material.
- the sealing resin 12 does not fill the entire gap between the optical waveguide 10 and the light emitting / receiving element 11, and it is not between the sealing resin 12 and the optical waveguide 10.
- the light emitting / receiving element 11 is mounted on the surface 13 a of the support substrate 13, and the sealing resin 12 has a predetermined thickness. After application, cure. Thereafter, the optical waveguide 10 is adhered and fixed on the surface 13 b of the support substrate 13.
- the amount of protrusion of the optical waveguide 10 is defined as follows so that a defect in transmission of the optical signal does not occur due to the stagnation of the optical waveguide 10. .
- the waveguide protrusion amount is L (m)
- the waveguide tip drooping angle is 0 (°)
- the second moment of area of the waveguide is Iz (m 4 )
- the longitudinal elastic modulus of the waveguide is E (Pa).
- the waveguide protrusion amount L is set to the end force of the support surface 13b supporting the optical waveguide 10 up to the center of the light path conversion mirror 10D in the core portion 10A.
- the waveguide tip drooping angle ⁇ is the light output of the optical waveguide 10 in a state where the light exit surface (or light incident surface) at the tip of the optical waveguide 10 and the light waveguide 10 have no stagnation (droop).
- the load w per unit length of the waveguide is determined by (mass per unit length of waveguide) x (gravity acceleration + maximum usable acceleration maximum value).
- the waveguide tip drooping angle ⁇ (°) is given by the following equation (1).
- the allowable angle ⁇ max of the waveguide tip drooping angle ⁇ is about 1.0 °. Therefore, in the optical cable module 1, the waveguide protrusion amount L is
- the waveguide protrusion amount L is defined in the range of 400 / z m or less. Note that a value of 20 m / s 2 is used as the actual usable acceleration maximum value.
- the amount of stagnation generated in the optical waveguide 10 can be set to a level that does not cause the transmission failure of the optical signal. Can be limited. Thereby, stable coupling between the optical waveguide and the light emitting and receiving element can be achieved.
- the amount of stagnation generated in the optical waveguide 10 is limited by specifying the amount of protrusion of the optical waveguide 10. It is possible to reduce the stagnation generated in the waveguide 10.
- another configuration example for reducing stagnation generated in the optical waveguide 10 will be described.
- FIG. 3 shows a configuration in which the occurrence of stagnation in the optical waveguide 10 is suppressed by arranging the reinforcing member 14 a on the upper surface of the optical waveguide 10 (the surface on which the light input / output surface does not exist).
- the reinforcing member 14a may be configured to have a plate-like reinforcing plate attached to the optical waveguide 10, or may be configured to apply a high curing resin to the optical waveguide 10 and to cure it. In the case where the highly cured resin is applied and cured, it may be cured while being held in a state in which no stagnation occurs in the optical waveguide 10.
- FIG. 4 is a configuration in which the generation of stagnation in the optical waveguide 10 is suppressed by arranging the reinforcing member 14 b on the lower surface of the optical waveguide 10 (the surface on the side where the light input / output surface exists). is there.
- the reinforcing member 14b may be a light transmitting member, and a plate-like reinforcing plate may be attached to the optical waveguide 10 in the same manner as the reinforcing member 14a, or a high curing resin may be applied to the optical waveguide 10 It may be configured to be cured.
- the reinforcing members may be provided on the side surfaces of the optical waveguide 10 or may be provided on any of a plurality of surfaces that do not need to be shown (for example, light Both the reinforcing member 14a on the upper surface of the waveguide 10 and the reinforcing member 14b on the lower surface of the optical waveguide 10 may be provided). Also, the reinforcing member need not be disposed on the entire mounting surface of the optical waveguide 10. For example, the configuration may be provided on both sides of the mounting surface of the optical waveguide 10 (see FIG. 5) or at the tip of the mounting surface.
- force that seals the light emitting / receiving element 11 with the sealing resin 12 usually generates a fillet in the sealing resin 12.
- the term “fillet” means that the applied sealing resin 12 before curing is raised by surface tension at the interface with the support substrate 13 (the interface perpendicular to the X axis), and the surface receives light emission. It refers to the cured part without being parallel to the light emitting and receiving surface of the element 11
- the amount of protrusion of the optical waveguide 10 Is preferably prescribed.
- the sealing resin fillet width F refers to the width in the X-axis direction of the region where the angle between the surface of the sealing resin 12 and the light emitting / receiving surface of the light emitting / receiving element 11 is 5 ° or more. Then, in the optical cable module 1, the waveguide protrusion amount L is set to a size equal to or larger than the sealing resin fillet width F. That is,
- the waveguide projection amount L may be defined as 100 m or more, preferably 130 m or more.
- the inclination angle of the light path conversion mirror 10D It is possible to make the configuration smaller than 45 °. That is, when the inclination angle ⁇ of the light path conversion mirror 10D is reduced, the light emitting / receiving element 11 is disposed in a region not affected by the force of the fillet of the sealing resin 12 as shown by the one-dot chain line in FIG.
- the light path conversion mirror 10D formed at the tip of the optical waveguide 10 is not present immediately above the light emitting / receiving element 11
- the light of the optical waveguide 10 and the light emitting / receiving element 11 You can get a bond.
- the inclination angle ⁇ of the light path conversion mirror 10D is smaller than 45 °, the above effect is more preferably 35 ° or more and 40 ° or less than the force to be obtained.
- the light emitting / receiving element 11 is disposed in the fillet generation region on the surface of the sealing resin 12 It is also possible to use a configuration that uses refraction at an angle of the surface of the fillet for light coupling between the path 10 and the light emitting / receiving element 11. In this configuration, the light emitting / receiving element 11 can be disposed closer to the support surface side of the optical waveguide 10 in the support substrate 13, and the waveguide protrusion amount L of the optical waveguide 10 can be further reduced by / J. .
- the sealing resin 12 is formed to have a gap with the optical waveguide 10, in the optical cable module 1, after curing the sealing resin 12, the sealing resin 12 is formed on the support substrate 13.
- the optical waveguide 10 is fixed.
- the sealing resin 12 may force the support surface 13 b of the optical waveguide 10 on the support substrate 13.
- accurate positioning of the optical waveguide 10 is achieved. It is obvious that we can not do it. Therefore, it is necessary to prevent the sealing resin 12 from coming into contact with the support surface 13 b of the optical waveguide 10 on the support substrate 13.
- various configurations and methods for preventing the sealing resin 12 from coming into contact with the support surface 13b of the optical waveguide 10 in the support substrate 13 will be described.
- a recess or a protrusion is formed on the contact surface 13 c (surface perpendicular to the X axis) of the support substrate 13 with the sealing resin 12. It is conceivable to set one. That is, the reason that the sealing resin 12 is applied to the surface 13 b of the support substrate 13 is that the sealing resin 12 spreads along the surface 13 c by its surface tension, and the concave and convex portions are provided on the surface 13 c. Can prevent the sealing resin 12 from spreading to the surface 13 b. The same effect can be obtained by providing a step on the surface 13c as shown in FIGS. 12 and 13 instead of providing the recess and the protrusion.
- the sealing resin 12 forms a fillet on the inner wall of the support substrate 13, and a problem occurs such that the sealing surface can not be formed flat.
- the fillet may be rolled up to the lower surface of the optical waveguide 10. If sealing of the light emitting / receiving element 11 is performed to mount the optical waveguide 10 in order to avoid this problem, the sealing resin 12 exudes to the fine irregularities formed at the time of molding on the upper surface of the support substrate 13. The adhesion between the optical waveguide 10 and the support substrate 13 is impaired. Especially when silicone-based resin is used as the sealing resin 12, the above-mentioned problems occur remarkably because the silicone-based resin has high wettability.
- the amount of protrusion of the optical waveguide 10 is increased to optically couple at a place where the sealing surface is flat, or the sealing surface is lowered to the upper surface of the support substrate 13.
- the tip of the optical waveguide 10 becomes mechanically unstable, and in the case of the latter, there is a problem that the light coupling efficiency is lowered.
- the above-described problem can be solved at once by forming the step in the horizontal direction on the inner wall of the support substrate 13. That is, if a step is formed on the inner wall of the support substrate 13, the sealing surface of the sealing resin 12 can be flattened at the position of the step, so the amount of protrusion of the optical waveguide 10 is increased.
- the tip of the optical waveguide 10 can be optically coupled with a mechanically stable amount of protrusion, and can be optically coupled with a small air gap with a flat sealing surface. Furthermore, the sealing resin 12 can be prevented from leaking out to the upper surface of the support substrate 13 (mounting surface of the optical waveguide 10).
- a stepped surface of at least one recess may be formed in the inner wall of the support substrate 13 in the horizontal direction.
- the same sealing resin 12 as in the case of forming a step on the inner wall of the support substrate 13 forms a fillet on the inner wall of the support substrate 13 and the upper surface of the support substrate 13 Can prevent the sealing resin 12 from staining.
- the amount of protrusion (the length of the portion not fixed to the upper surface of the support substrate 13) of the optical waveguide 10 can be made smaller than that of the structure of forming the step shown in FIG. And a more stable light coupling structure can be realized.
- the optical cable module includes the optical waveguide having the core portion surrounded by the cladding layer and the light emitting / receiving element on the supporting substrate, and the optical waveguide is And an optical path conversion mirror for converting the direction of the optical path of the optical signal transmitted through the core portion, wherein the emission surface of the light in the optical waveguide or the incident surface of the light to the optical waveguide It is disposed to face the light receiving surface or the light emitting surface of the element, and the waveguide projection from the end of the support surface supporting the optical waveguide on the support substrate to the center of the optical path conversion mirror in the core portion of the optical waveguide.
- the amount L the load per unit length of the optical waveguide is w
- the second moment of area of the optical waveguide is Iz
- the longitudinal elastic coefficient of the optical waveguide is E
- the light exit surface (or light entrance surface) at the tip of the optical waveguide, and the light exit surface (or light entrance surface) of the optical waveguide in a state where stagnation (drooping) occurs in the optical waveguide If the angle between the waveguide and the tip of the waveguide is ⁇ ,
- the load w per unit length of the optical waveguide can be determined by (mass per unit length of the waveguide) x (gravity acceleration + maximum usable acceleration value), but the waveguide tip sag angle ⁇ allowance The angle ⁇ max is around 1.0 °. Therefore, in the optical cable module, the waveguide protrusion amount L is
- the waveguide tip can be suppressed within an allowable angle of 1.0 °, and the amount of stagnation generated in the optical waveguide is a transmission failure of the optical signal. Not allowed, can be limited to a degree.
- the waveguide projection amount L is preferably 400 ⁇ m or less.
- Another optical cable module is an optical cable module including an optical waveguide having a core portion surrounded by a cladding layer and a light emitting / receiving element on a supporting substrate as described above.
- the light emitting surface is disposed to face the light receiving surface or the light emitting surface of the light emitting / receiving element, and the optical waveguide is a protrusion of the support surface force of the optical waveguide on the support substrate.
- the light input / output surface side and the Z or light input / output surface do not exist, and a reinforcing member is provided on the side surface.
- the reinforcing member on the upper surface (the surface on which the light input / output surface does not exist) or the lower surface (the surface on which the light input / output surface exists) of the optical waveguide, The generation of stagnation can be suppressed, and the amount of stagnation generated in the optical waveguide can be limited to a degree that does not cause transmission failure of the optical signal.
- still another optical cable module is an optical cable module including an optical waveguide having a core portion surrounded by a cladding layer and a light emitting / receiving element on a supporting substrate.
- the optical waveguide includes an optical path conversion mirror for converting the direction of the optical path of the optical signal transmitted through the core portion, and the light exit surface of the optical waveguide or to the optical waveguide is provided.
- the light incident surface is disposed to face the light receiving surface or the light emitting surface of the light emitting / receiving element, and the light emitting / receiving element is sealed with a sealing resin, and the light receiving surface of the light receiving / emitting element is Alternatively, an air gap is provided between the surface of the sealing resin on the light emitting surface and the light emitting surface or the light incident surface of the optical waveguide, and the end of the supporting surface for supporting the optical waveguide in the supporting substrate. From the core of the optical waveguide If waveguides projecting amount to the center of the road-conversion mirror one L, and the width of the waveguide optical axis direction of the fillet generated in the sealing ⁇ and F,
- the fillet fillet means that the applied sealing resin before curing swells due to surface tension at the interface with the support substrate (interface perpendicular to the optical axis of the optical waveguide), and the surface receives and emits light. It refers to a portion that is hardened without being parallel to the light emitting and receiving surface of the device.
- the fillet width F of the sealing resin refers to the width in the direction of the optical axis of the optical waveguide in a region where the angle between the surface of the sealing resin and the light emitting / receiving surface of the light emitting / receiving element is 5 ° or more. Do.
- the waveguide protrusion amount L is preferably 100 m or less.
- a recess or a protrusion may be formed on the surface of the support substrate in contact with the surface of the sealing resin.
- a step may be formed on the surface of the support substrate in contact with the surface of the sealing resin.
- the sealing resin is formed to have an air gap between it and the optical waveguide, in the optical cable module, after curing the sealing resin, the optical waveguide is formed on the supporting substrate. It is supposed to fix the At this time, if the sealing resin reaches the supporting surface of the optical waveguide on the supporting substrate, accurate positioning of the optical waveguide can not be performed.
- the sealing resin is applied to the supporting surface because the sealing resin spreads along the surface of the supporting substrate in contact with the sealing resin due to the surface tension of the sealing resin. According to the above configuration, the sealing resin can be extended to the supporting surface of the optical waveguide in the supporting substrate by providing the concave portion, the convex portion or the step on the contact surface with the sealing resin in the supporting substrate. Can be prevented.
- a member having higher wettability than the support substrate is attached to the surface of the support substrate in contact with the surface of the sealing resin, or the sealing is performed.
- the surface of the support substrate in contact with the surface of the resin may be coated with a material that improves the surface wettability.
- the light emitting and receiving element is sealed with a sealing resin, and the surface of the sealing resin on the light receiving surface or the light emitting surface of the light emitting and receiving element;
- An air gap is provided between the light exit surface or the light entrance surface of the optical waveguide, and the inclination angle of the optical path conversion mirror is the angle formed with respect to the optical axis of the core portion of the optical waveguide. Can be set to an angle smaller than 45 °.
- the light emitting and receiving element is disposed in the area from the force of the fillet of the sealing resin, and the amount of protrusion of the optical waveguide is small (the optical path conversion mirror formed at the tip of the optical waveguide is Even in the state where it does not exist immediately above the light emitting / receiving element), it is possible to obtain optical coupling between the optical waveguide and the light emitting / receiving element. That is, the amount of protrusion of the optical waveguide can be reduced, and the amount of stagnation generated in the optical waveguide can be reduced.
- the light emitting and receiving element can be disposed in an area where the fillet occurs in the sealing resin.
- the refraction at the angle of the fillet surface can be used in the optical coupling between the optical waveguide and the light emitting / receiving element.
- the light emitting / receiving element can be further disposed on the support surface side of the optical waveguide in the support substrate, and the waveguide protrusion amount L of the optical waveguide can be further reduced.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Integrated Circuits (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008509900A JP4407768B2 (ja) | 2006-04-07 | 2007-04-09 | 光ケーブルモジュール |
US12/295,786 US7657140B2 (en) | 2006-04-07 | 2007-04-09 | Optical cable module |
CN2007800126116A CN101416088B (zh) | 2006-04-07 | 2007-04-09 | 光缆模块 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-106984 | 2006-04-07 | ||
JP2006106984 | 2006-04-07 |
Publications (1)
Publication Number | Publication Date |
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WO2007116998A1 true WO2007116998A1 (ja) | 2007-10-18 |
Family
ID=38581271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/057836 WO2007116998A1 (ja) | 2006-04-07 | 2007-04-09 | 光ケーブルモジュール |
Country Status (5)
Country | Link |
---|---|
US (1) | US7657140B2 (ja) |
JP (1) | JP4407768B2 (ja) |
KR (1) | KR100999685B1 (ja) |
CN (2) | CN101416088B (ja) |
WO (1) | WO2007116998A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010204209A (ja) * | 2009-02-27 | 2010-09-16 | Omron Corp | 光伝送モジュール、電子機器、及び光伝送モジュールの製造方法 |
JP2014026106A (ja) * | 2012-07-26 | 2014-02-06 | Nippon Telegr & Teleph Corp <Ntt> | 集積型光モジュール |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100953486B1 (ko) * | 2005-12-28 | 2010-04-16 | 오므론 가부시키가이샤 | 광모듈 |
KR101023337B1 (ko) * | 2006-01-11 | 2011-03-18 | 오므론 가부시키가이샤 | 광케이블 모듈 및 그것을 이용한 기기 |
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- 2007-04-09 CN CN2007800126116A patent/CN101416088B/zh not_active Expired - Fee Related
- 2007-04-09 JP JP2008509900A patent/JP4407768B2/ja not_active Expired - Fee Related
- 2007-04-09 US US12/295,786 patent/US7657140B2/en not_active Expired - Fee Related
- 2007-04-09 KR KR1020087021567A patent/KR100999685B1/ko not_active IP Right Cessation
- 2007-04-09 WO PCT/JP2007/057836 patent/WO2007116998A1/ja active Application Filing
- 2007-04-09 CN CN2010101153218A patent/CN101788704B/zh not_active Expired - Fee Related
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JP2014026106A (ja) * | 2012-07-26 | 2014-02-06 | Nippon Telegr & Teleph Corp <Ntt> | 集積型光モジュール |
Also Published As
Publication number | Publication date |
---|---|
US7657140B2 (en) | 2010-02-02 |
JP4407768B2 (ja) | 2010-02-03 |
JPWO2007116998A1 (ja) | 2009-08-20 |
KR20080091846A (ko) | 2008-10-14 |
US20090110350A1 (en) | 2009-04-30 |
KR100999685B1 (ko) | 2010-12-08 |
CN101788704A (zh) | 2010-07-28 |
CN101788704B (zh) | 2012-08-08 |
CN101416088A (zh) | 2009-04-22 |
CN101416088B (zh) | 2010-06-16 |
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