EP2076804A2 - Surface warp resistant optical devices - Google Patents
Surface warp resistant optical devicesInfo
- Publication number
- EP2076804A2 EP2076804A2 EP07843851A EP07843851A EP2076804A2 EP 2076804 A2 EP2076804 A2 EP 2076804A2 EP 07843851 A EP07843851 A EP 07843851A EP 07843851 A EP07843851 A EP 07843851A EP 2076804 A2 EP2076804 A2 EP 2076804A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- optical component
- peripheral portion
- component
- central
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
-
- 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
Definitions
- the present invention relates to optical devices and to optical devices that include features for increasing the surface warp resistance of the optical devices.
- Fiber optic technology is increasingly employed in the transmission of data over communication networks.
- Networks employing fiber optic technology are known as optical communication networks, and are typically characterized by high bandwidth and reliable, high-speed data transmission.
- a fiber optic transceiver includes one or more optical sub-assemblies ("OSAs”) having an optical transducer.
- OSAs optical sub-assemblies
- TOSAs transmitter optical sub-assemblies
- ROSAs receiver optical sub-assemblies
- a TOSA receives an electrical data signal and converts the electrical data signal into an optical data signal for transmission onto an optical network.
- a ROSA receives an optical data signal from the optical network and converts the received optical data signal to an electrical data signal for further use and/or processing. Both the ROSA and the TOSA include specific optical components for performing such functions.
- a typical TOSA includes an optical transmitter such as a light emitting diode or a laser diode for transmitting an optical signal to an optical fiber or optical waveguide.
- the optical transmitter is typically covered by an at least partially transparent cap that protects the optical transmitter while allowing the optical transmitter to transmit the optical signal to the optical cable.
- the cap may include a lens for focusing the optical signal transmission.
- a typical ROSA includes an optical receiver, such as a PIN photodiode or avalanche photodiode ("APD").
- the optical receiver is typically covered by an at least partially transparent cap that protects the optical receiver and allows the optical receiver to receive an optical signal from an optical cable.
- the cap may include a lens for focusing the optical signal transmission received from the optical cable.
- the lens and other optical components are often press fit into the corresponding OSA.
- the compression force may alter the surface profile of the optical component. This may be especially significant if the optical component uses soft or deformable material, such as plastic.
- the OSA while the OSA is operating the optical components may be subjected to large amounts of thermal energy.
- the thermal energy causes the optical component to expand relative to the holder, resulting in compressive forces on the optical component due to differences in the coefficients of thermal expansion (CTE) of the holder and the optical component, which may result in stress on the surfaces of the optical component. Stress on the surfaces of the optical component may result in a change in the reflective index and/or birefringence of the materials. Such changes may interfere with the efficient operation of the optical component by changing the focus spot size, the position of the image and/or the quality of the image.
- CTE coefficients of thermal expansion
- an optical component includes a central optical surface proximate an optical axis, a peripheral portion extending radially from the central optical surface, and a stepped portion between the central optical surface and the peripheral portion.
- the stepped portion may be formed to raise the central optical surface above the peripheral portion.
- an optical component in another example, includes an optical surface having an optical axis extending therethrough, a peripheral portion adjacent the optical surface, and a boundary portion adjacent the peripheral portion. In such an example, at least a portion of the peripheral portion defines a recess between the boundary portion and the optical surface.
- optical sub-assembly includes an opto-mechanical holder and an optical component secured to the opto-mechanical holder.
- the optical component may include a central optical surface proximate an optical axis, a peripheral portion extending radially from the central optical surface, and a stepped portion between the central optical surface and the peripheral portion in which the stepped portion is formed to raise the central optical surface above the peripheral portion.
- Figure 3B discloses aspects of the optical sub-assembly of Figure 3A
- Figure 4A discloses an optical device configured to manage backreflection in the optical sub-assembly of Figures 3 A and 3B
- Figure 4B discloses aspects of a design methodology for the optical device of Figure 4A.
- an optical component includes at least one optical surface, a peripheral portion, and a boundary portion.
- the optical component has at least one stepped portion between the peripheral member and the optical surface that raises the optical surface relative to the peripheral portion to form a raised optical surface.
- Such a configuration may at least partially isolate the raised optical surface from stresses that act on other portions of the raised optical surface.
- the boundary portion may be raised relative to both the peripheral portion and the raised optical surface, such that a relief is formed between the raised optical surface and the boundary portion. Such a configuration may allow the boundary portion to provide both axial and radial protection to the raised optical surface.
- Optical components with raised optical surfaces can be implemented in a variety of OSAs, including any of the OSAs that are integrated into optoelectronic transceiver and transponder modules.
- optical components with raised optical surfaces can be implemented in any OSA irrespective of the data rate, operating wavelength, transmission standard, case temperature range, connector type, module type, or reach of the OSA.
- Figs. IA- ID illustrate an optical component 10.
- Fig. IA illustrates a top perspective view
- Fig. IB illustrates a bottom perspective view
- Fig. 1C illustrates a plan view
- Fig. ID illustrates a cross-sectional view taken along section A-A from Fig. 1C.
- the optical component 10 will be described as a generally concentric optical component that is concentric about an axis 11, which may be aligned with an optical axis of an assembly of which the optical component is a part.
- an axial dimension may generally correspond to a depth dimension
- the radial component may generally correspond to a width dimension.
- one side of the optical component 10 will be described. This description may apply equally to the other side of the optical component 10.
- optical components may include flat, spherical, and/or aspherical surfaces to form lenses, prisms, or other type of optical device.
- the optical component 10 generally includes a raised optical surface 12 proximate a central portion, such as a raised lens surface or a raised prism surface.
- a peripheral portion 13 is illustrated as extending radially from the raised optical surface 12.
- the raised optical surface 12 may be raised and separated from the peripheral portion 13 by a stepped portion 14. Accordingly, the stepped portion 14 provides axial separation between the raised optical surface 12 and the peripheral portion 13.
- the optical component 10 further includes a boundary portion 15.
- the boundary portion 15 may extend both laterally and axially from the peripheral portion 13.
- the boundary portion 15 may be sized to extend axially beyond the raised optical surface 12 resulting in a gap between the raised optical surface 12 and the boundary portion 15.
- the extension of the boundary portion 15 beyond the raised optical surface 12 may allow the boundary portion 15 to protect the raised optical surface 12.
- the extension of the boundary portion 15 radially beyond the peripheral portion 13, as well as the configuration of the peripheral portion 13 and the stepped portion 14 may reduce the effects of thermal and/or mechanical stress on the performance of the optical component 10 by reducing stress in the raised optical surface 12. Such stresses may be due to compressive and/or thermal forces present when the optical component is operating while secured to an optical sub-assembly.
- Fig. 2 illustrates a cross-sectional view of the optical component 10 secured to an opto-mechanical holder 20.
- the optical component 10 may be press fit and/or bonded to the optical mechanical holder. Stresses in the optical component may be due, at least in part, to a difference in size between the optical mechanical holder 20 and the optical component 10. For example, mechanical stresses may occur in press fitting the optical component 10 to the opto-mechanical holder 20.
- a press fit may be realized when the outer dimension of the optical component 10 is slightly larger than the inner dimension of the opto-mechanical holder 20. The difference in dimension results in a compressive force that secures the optical device at a desired location and orientation relative to the opto-mechanical holder 20.
- Thermal stress may occur when the optical component 10 and/or the optomechanical holder 20 are heated.
- some portion of the light may be absorbed by the optical component 10.
- the optical component 10 heats up and expands.
- the opto- mechanical holder 20 may not absorb as much light and/or may be made of a material that expands less with a given temperature difference than the optical component.
- Other thermal conditions may cause the opto-mechanical holder 20 to cool and/or contract more rapidly than the optical component 10. These and other differences may result in the opto-mechanical holder 20 being smaller than the optical component 10. The result may be additional compressive forces on the optical component 10, which results in stress in the optical component 10.
- the configuration of the optical component 10 may reduce the effect such stress has on the raised optical surface 12.
- the stress may first compresses the boundary portion 15.
- the boundary portion 15 is separated from the raised optical surface 12 by a gap.
- stress is transferred from the boundary portion 15 to other parts of the optical component 10 is transferred to the peripheral portion 13.
- the stresses that may be transferred from the peripheral portion 13 to the rest of the optical component may be influenced by the stepped portion 14.
- stress from the peripheral portion may be concentrated at or near the inner limits of the stepped portion 14. This may be due, in part, to the abrupt change of geometry of the part at the stepped portion 14. Regardless of the cause, the configuration of the optical component 10 reduces the stress that acts on the raised optical surface 12.
- the configuration of the optical component helps reduce the stress on the optical surface as well as helping to achieve a more uniform surface deformation when subjected to temperature increases, temperature decreases, and/or compressive forces resulting from press fitting or other operations. Accordingly, the configuration of the optical component helps reduce the stress on the optical surface as well as helping to achieve a more uniform surface deformation, regardless of the source of the stress.
- Figures 3 A and 3B disclose an example OSA 100.
- the OSA 100 is a transmitter optical sub-assembly (TOSA).
- the OSA 100 could be a receiver optical sub-assembly (ROSA) however, since example embodiments of the invention can be integrated into either a TOSA or a ROSA.
- the OSA 100 includes a barrel 102.
- the barrel 102 is connected to a TO-Can 104.
- the TO-Can 104 is partially disposed within the barrel 102.
- the TO-Can 104 includes a header 106 with multiple electrical leads 108 that are configured to electrically connect components of the TO-Can 104 with a printed circuit board and associated circuitry (not shown) of an optoelectronic transceiver or transponder module into which the OSA 100 is assembled.
- the leads 108 enable electrical power and electrical signals to be transmitted to and from the TO-Can 104.
- the TO-Can 104 also includes a cap 110 connected to the header 106.
- the cap 110 creates an air-tight evacuated enclosure 112 for various TO-Can components, as disclosed elsewhere herein.
- the TO-Can 104 also optionally includes a lens 114 partially disposed in the cap 110.
- the lens 1 14 illustrated in Figures 3 A and 3B includes a raised optical surface, a peripheral portion, and a boundary portion. A relief portion defined between the boundary portion and the raised optical surface.
- lens 114 is a ball lens
- lens 1 14 can be another type of lens including, but not limited to, a half-ball lens.
- the lens 1 14 can be removed where at least the corresponding portion of the cap 110 is light-transmissible, or the lens can be replaced with a window fitted in the cap 110.
- the example OSA 100 includes a first cavity 1 16 in open communication with a second cavity 1 17, both of which are defined by the barrel 102.
- the first and second cavities 1 16 and 117 can be evacuated or can contain some kind of gas such as air.
- the OSA 100 also includes an optical device 200 for managing backreflection.
- the optical device 200 is discussed in greater detail below in connection with Figures 4A and 4B.
- the optical device 200 is disposed within the second cavity 1 17.
- the OSA 100 further includes a third cavity 1 18 defined by the barrel 102.
- the third cavity 118 is opposite the second cavity 117. Proximate the third cavity 118 is a port 120.
- the port 120 is defined in one end of the barrel 102.
- the port 120 is configured to receive an optical connector, such as a fiber ferrule, in order to facilitate the coupling of an optical fiber to the OSA 100.
- the port 120 can be configured to receive an optical connector corresponding to an optical waveguide in order to facilitate the coupling of an optical waveguide to the OSA 100.
- the TO-Can may include various components.
- the TO-Can may include various components.
- the TO-Can may include various components.
- the TO-Can 104 of the OSA 100 includes a transmitter 122 disposed within the evacuated enclosure 112.
- the transmitter 122 can be any type of transmitter including, but not limited to, any of the transmitters listed in Appendix A.
- the transmitter 122 can be a Fabry-Perot laser, DFB laser, or other edge emitter.
- the transmitter 122 can also be a VCSEL or LED.
- the transmitter 122 uses the electrical power supplied by the leads 108 to convert an electrical signal supplied by the leads 108 into a corresponding optical signal 150.
- the OSA 100 is configured such that the optical signal 150 generated by the transmitter 122 passes into the evacuated enclosure 112 and through the lens 114 which focuses the optical signal 150.
- the optical signal 150 then passes through the first cavity 1 16, through the optical device 200, through the third cavity 1 18, and into the port 120.
- an optical connector of an optical cable (not shown) is plugged into the port 120, the optical signal 150 can enter into the optical cable, and thereby be transported to another component through the optical cable.
- the optical device 200 bends the optical signal 150 one or more times before the signal enters the fiber or waveguide. Among other things, this bending reduces or avoids performance degradation of the transmitter 122 due to backreflection.
- FIG. 4A aspects of an example optical device 200 are disclosed in greater detail.
- a variety of means may be employed to perform the functions of the example optical device 200.
- the optical device 200 includes a raised optical surface.
- the optical device 200 further includes peripheral portion and a boundary portion.
- a relief portion is defined between the boundary portion and the raised optical surface.
- the configuration of the example optical device 200 comprises but one exemplary structural implementation of a means for managing back reflection.
- any light-transmissible device capable of twice bending an optical signal could be used in place of the optical device 200.
- the example optical device 200 can either be separately or integrally formed with the barrel 102.
- the optical device 200 can be formed from the same material as the barrel 102, or from a different material than the barrel 102, depending on the needs of a particular application.
- the optical device 200 can be formed from any light- transmissible material including, but not limited to, any light transmissible glass or plastic.
- any light transmissible glass or plastic for example, one or both of the optical device 200 and the barrel 102 can be formed from Ultem® plastic.
- the material from which the optical device 200 is formed must be light transmissible in order to allow the optical signal 150 to pass through the optical device 200.
- the optical device 200 includes two angled surfaces through which the optical signal 150 must pass in order to exit the OSA 100.
- the term "angled" as used herein refers to a surface that non-perpendicular with respect to the longitudinal axis of a defined optical path, for example, an OS A/optical axis 152.
- the OS A/optical axis 152 is defined as the path between the point on the surface of the transmitter 122 where the optical signal 150 is generated and the center point on the optical fiber or optical waveguide where the optical signal 150 is ultimately directed, as disclosed in Figure 4B
- the OS A/optical axis 152 in the example OSA 100 also corresponds with the longitudinal axis of the OSA 100.
- first and second surfaces 202 and 204 of the optical device 200 are angled with respect to the OSA/optical axis 152.
- One or both of the angled surfaces 202 and 204 can be planar, spherical, or aspherical, or some combination thereof.
- the axis of the spherical surface will be tilted to the desired angle of the angled surfaces 202 and 204.
- the use of a spherical or aspherical surface for one or both of angled surfaces 202 and 204 can combine the function of the lens 1 14 and the angled surface or surfaces, thus eliminating the need for the lens 1 14. Combinations of one or more of the above aspects could enable fine tuning of the surface profile such that the optimum spot size, coupling efficiency, backreflection reduction and alignment stability are achieved.
- the optical device 200 is positioned within the barrel 102 such that the optical signal 150 must pass through the optical device 200 in order to exit the OSA 100 through the port 120. Particularly, the optical signal 150 is incident first on the first surface 202 and then exits the optical device 200 through the second surface 204.
- the first angled surface 202 can optionally be coated with an anti-reflective coating to help reduce or avoid backreflection as the optical signal 150 passes through the first angled surface 202.
- the magnitude of the bending of the optical signal 150 by the optical device 200 is a function of the surface angles of the first and second surfaces 202 and 204.
- various desired effects can be achieved through variations to one or both of the surface angles of the first and second surfaces 202 and 204.
- the angle of the first angled surface 202 causes the optical signal 150 to be bent by "D" degrees off the OSA/optical axis 152.
- the angle of the second angled surface 204 causes the optical signal 150 to be bent so at approach any optical fiber plugged into the port 120 at an angle of "D" degrees off the OSA/optical axis 152.
- the angle "D" is within the numerical aperture of any optical fiber plugged into the port 120.
- Figure 4B aspects of a design methodology for the example optical device 200 are disclosed.
- the optical surfaces are illustrated as flat for ease of reference.
- the optical device may include a raised optical surface, a peripheral portion, and a boundary portion in which a stepped portion defines a relieved portion between the raised optical surface and the boundary portion.
- Figure 4B discloses an optical cable 210 positioned relative to the optical device 200 in the position that the cable 210 would be positioned were it plugged into the port 120 of the OSA 100 of Figures 3A-4A.
- Figure 4B discloses a first distance di and a second distance d 2 .
- the first distance di is defined as the distance along the y axis between the points where the optical signal 150 enters through the first surface 202 and exits through the second surface 204, respectively.
- the second distance d 2 is defined as the distance along the y axis between the point where the optical signal 150 exits through the second surface 204 and the point where the optical signal 150 is incident upon a face 206 of a fiber 208.
- the fiber 208 may comprise a portion of the optical cable 210 that is plugged into the port 120, as disclosed in Figures 3B and 4A.
- the first distance di is approximately equal to the second distance d 2; while, in other embodiments, the first distance di and the second distance d 2 are not equal.
- the angle ⁇ D(beta) is the angle between the first angled surface 202 and an imaginary surface substantially perpendicular to the OS A/optical axis 152.
- the magnitude of the angle ⁇ D of the first angled surface 202 is such that little or none of the backreflection generated as the optical signal 150 is incident upon the first angled surface 202 will be directed back toward the transmitter 122.
- the angle ⁇ D(alpha) is the angle between the second angled surface 204 and an imaginary surface perpendicular to the OS A/optical axis 152.
- the angles ⁇ D and ⁇ D are not equal while, in other embodiments, ⁇ D and ⁇ D are substantially equal to each other.
- the extent to which the optical signal 150 is bent by the optical device 200 is a function of the surface angles ⁇ D and ⁇ D of the first and second surfaces 202 and 204, respectively.
- the angles ⁇ 1 - ⁇ 5 (theta-subl through theta sub5) disclosed in Figure 4B are ultimately determined by the angles ⁇ D and ⁇ D and by the material from which the optical device 200 is formed.
- the relative values of the angles ⁇ D and ⁇ D are dictated in part by the need for the optical signal 150 to be incident upon the surface 206 proximate the center of the fiber 208 of the optical cable 210 and within the numerical aperture of the fiber 208.
- the normal lines 212, 214, 218, and 220 in Figure 2B are each pe ⁇ endicular to one of the angled surfaces 202 or 204 of the optical device 200.
- the optical device 200 is configured to cause the angle ⁇ 5 to be greater than 0°, the optical device 200 is also configured to ensure that the angle ⁇ 5 is not greater than the numerical aperture of the optical cable 210 that is connected to the OSA 100.
- the term "numerical aperture” refers to the maximum angle to the longitudinal axis of the fiber 208 at which light can be launched into and constrained within the fiber 208 of the optical cable 210.
- the longitudinal axis of the fiber 208 corresponds in this example to the OS A/optical axis 152.
- backreflection can be generated in some situations when the optical signal 150 is incident upon one or more surfaces within the OSA 100.
- backreflection 222 can be created when a portion of the optical signal 150 is reflected by the surface 206 of the fiber 208 of the optical cable 210 instead of passing through the surface 206 into the fiber 208.
- any backreflection 222 is directed at an angle ⁇ 6 toward the optical device 200.
- the angle ⁇ 6 is the angle between the backreflection 222 and the OSA/optical axis 152.
- the angle ⁇ is substantially equal to the angle ⁇ 5.
- the backreflection 222 is twice bent as it passes through the second and first angled surfaces 204 and 202. This bending, when combined with the effects of the initial angle ⁇ 6 , results in a final direction of travel 224 for the backreflection 222, where the direction of travel 224 is away from the transmitter 122 as disclosed in Figure 4B.
- the final direction of travel 224 of the backreflection 222 may be 5° off the longitudinal axis of the fiber 208.
- the example embodiments of the optical device disclosed herein can therefore manage the negative effects of backreflection in OSAs in several ways.
- the first angled surface of the optical device causes any backreflection generated at the first angled surface to be redirected such that the backreflection is directed away from a sensitive optoelectronic transmitter within the TOSA.
- the angled surfaces of the optical device cause any backreflection generated at the surface of an optical fiber or optical waveguide to likewise be redirected such that the backreflection is directed away from the TOSA' s transmitter.
- the angled surfaces of the optical device can redirect any backreflection generated within the ROSA away from the ROSA's port so that the backreflection does not travel as optical feedback through an optical cable or waveguide back to a sensitive optoelectronic transmitter in a distant TOSA.
- the example optical device disclosed herein can be integrally molded as part of a barrel of an OSA. Integrally forming the optical device as part of the barrel of an OSA enables the cost of the material from which the optical device is formed to be absorbed into the cost of the barrel. Also, integrally forming the optical device as part of the barrel of an OSA eliminates the cost of assembling the optical device into the OSA.
- multiple optical devices 200 could be included within a single OSA to further isolate any backreflection within the OSA.
- example embodiments having multiple optical devices 200 serially arranged within an OSA are possible and contemplated.
- the example optical device 200 can be used in conjunction with other known devices for reducing backreflection.
- the optical device 200 can be used in conjunction with a quarter wave plate in order to achieve desired effects with respect to optical isolation against backreflection.
- the quarter wave plate can be positioned anywhere between the laser 122 and the lens 114, between the lens 114 and the optical device 200, or between the optical device 200 and the optical fiber 208.
- the optical device 200 can be used in other optical applications.
- the optical device 200 can be used in a metal port of any optical component where backreflection may be a concern.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Optical Head (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82816606P | 2006-10-04 | 2006-10-04 | |
US97307007P | 2007-09-17 | 2007-09-17 | |
US11/864,687 US7572069B2 (en) | 2007-09-17 | 2007-09-28 | Surface warp resistant optical devices |
PCT/US2007/080461 WO2008043028A2 (en) | 2006-10-04 | 2007-10-04 | Surface warp resistant optical devices |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2076804A2 true EP2076804A2 (en) | 2009-07-08 |
EP2076804A4 EP2076804A4 (en) | 2013-07-10 |
Family
ID=40691376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07843851.2A Withdrawn EP2076804A4 (en) | 2006-10-04 | 2007-10-04 | Surface warp resistant optical devices |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2076804A4 (en) |
CN (1) | CN101535854B (en) |
TW (1) | TW200821647A (en) |
WO (1) | WO2008043028A2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010004414A1 (en) * | 1999-12-13 | 2001-06-21 | Gerhard Kuhn | Coupling configuration |
US20030147602A1 (en) * | 2002-02-01 | 2003-08-07 | Koji Takada | Optical link device |
JP2004361583A (en) * | 2003-06-03 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Optical module |
EP1998198A2 (en) * | 2007-05-14 | 2008-12-03 | Alps Electric Co., Ltd. | Optical coupling element and optical coupling unit |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3958891B2 (en) * | 1999-04-23 | 2007-08-15 | 矢崎総業株式会社 | Optical connector |
EP1722258A1 (en) * | 2005-05-13 | 2006-11-15 | STMicroelectronics S.r.l. | Optical radiation coupling module |
-
2007
- 2007-10-03 TW TW096137161A patent/TW200821647A/en unknown
- 2007-10-04 CN CN2007800358058A patent/CN101535854B/en active Active
- 2007-10-04 EP EP07843851.2A patent/EP2076804A4/en not_active Withdrawn
- 2007-10-04 WO PCT/US2007/080461 patent/WO2008043028A2/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010004414A1 (en) * | 1999-12-13 | 2001-06-21 | Gerhard Kuhn | Coupling configuration |
US20030147602A1 (en) * | 2002-02-01 | 2003-08-07 | Koji Takada | Optical link device |
JP2004361583A (en) * | 2003-06-03 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Optical module |
EP1998198A2 (en) * | 2007-05-14 | 2008-12-03 | Alps Electric Co., Ltd. | Optical coupling element and optical coupling unit |
Non-Patent Citations (1)
Title |
---|
See also references of WO2008043028A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN101535854B (en) | 2012-10-31 |
CN101535854A (en) | 2009-09-16 |
WO2008043028A2 (en) | 2008-04-10 |
WO2008043028A3 (en) | 2008-11-20 |
TW200821647A (en) | 2008-05-16 |
EP2076804A4 (en) | 2013-07-10 |
WO2008043028A9 (en) | 2008-05-22 |
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Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20090429 |
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