EP1476777A1 - Ferule de connexion de fibres optiques - Google Patents
Ferule de connexion de fibres optiquesInfo
- Publication number
- EP1476777A1 EP1476777A1 EP03742582A EP03742582A EP1476777A1 EP 1476777 A1 EP1476777 A1 EP 1476777A1 EP 03742582 A EP03742582 A EP 03742582A EP 03742582 A EP03742582 A EP 03742582A EP 1476777 A1 EP1476777 A1 EP 1476777A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical
- electrical
- port
- housing
- ferrule
- 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- Withdrawn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
-
- 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
-
- 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
- G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
-
- 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
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/424—Mounting of the optical light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
-
- 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
-
- 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
- G02B6/4256—Details of housings
- G02B6/426—Details of housings mounting, engaging or coupling of the package to a board, a frame or a panel
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4266—Thermal aspects, temperature control or temperature monitoring
- G02B6/4268—Cooling
- G02B6/4269—Cooling with heat sinks or radiation fins
Definitions
- the present invention relates to a ferrule for connection of optical fibers. It is intended to simplify the use of optical fibers whose interests are growing.
- An optical fiber is mainly used as a means of transporting information, in the form of light signals, normally digitized.
- This means of transport has the advantage of effectively resisting noise, in particular electromagnetic noise, and also allowing very high information rates.
- the processing in current computer devices being of electronic type, it is important to make an optoelectronic conversion of the light signals to be processed, at the input and at the output of the optical fiber.
- Various solutions have been devised to solve these conversion problems. In some solutions, it has been imagined to manufacture harnesses.
- the optical fiber or a layer of optical fiber is provided at its two ends (or at least at one of its ends), in a fixed manner, with an optoelectronic conversion device.
- the fiber delivers electrical or electronic signals at one or both ends while it can deliver optical signals at another end.
- the disadvantage presented by this type of solution is on the one hand the cost generated by this integration of means.
- the workability of the fiber is greatly reduced. Indeed, it is easily understood that the length of the fiber cannot be adjusted as easily as one would like, a fortiori if it is provided on either side with electronic conversion circuits crimped at the end of the fibers. In this case, it is not at all possible to lengthen or shorten it.
- the ferrule of the invention then generally has the shape of a parallelepiped of which one of the faces comprising the optical port serves to receive the removable end of the optical fibers, and of which a face opposite to this reception face carries an optoelectronic circuit of detection and / or emission as well as a control circuit.
- the casing of the ferrule carries contacts allowing the connection of this ferrule to an electronic circuit, in particular a printed circuit.
- the subject of the invention is therefore a ferrule for connection of optical fibers comprising an optical port on an input face to removably accommodate one or more terminations of optical fibers, optoelectronic circuits for converting optical signals into electrical signals, and or vice versa, placed on an outlet face opposite the inlet face and an electrical port for connection to an electronic circuit, characterized in that it comprises an optical path opening on the one hand directly to the optical port, and on the other hand directly on a detection or transmission part of the conversion circuits and in that the electrical port is placed on a connection face contiguous to the input and output faces.
- FIG. 1 a perspective representation, seen from below, of a connection ferrule according to the invention
- FIG. 2 a schematic representation, side view of the ferrule of Figure 1;
- FIG. 3 part of the ferrule of optical fiber connection of the invention, before installation of the optoelectronic conversion circuits;
- FIG. 4 a schematic representation of the preferred arrangement of an optoelectronic integrated circuit in the ferrule of the invention;
- FIG. 1 shows a ferrule 1 for connection of optical fibers according to the invention.
- This ferrule 1 includes an optical port 2 for removably receiving one or more optical fiber terminations.
- the optical fibers received are for example optical fibers such as 3 provided at their ends with a tip 4, preferably standardized.
- the fibers 3 may preferably be in an even number, one fiber serving for transmission in one direction, another in another.
- the fibers mounted in flexible ply can relate to any number of transmission paths, ideally but not only, four return transmission paths.
- the end pieces 4 are used to make a difference agreed in advance between the different terminations of the optical fibers of a sheet.
- the end piece 4 thus has a face 5 intended to abut against a face 6 of the ferrule 1.
- the face 6 is that which includes the optical port 2.
- the tip 4 is provided with pins 8 which engage in reservations made correspondingly in the face 6, also very precisely. Pins 8 are used to guide the terminations in the optical port.
- a housing 7 of the ferrule 1 is made of an insulating material.
- the housing 7 is molded.
- it is made of plastic, for example PBT, LCP or polyimide which holds well in temperature, or any other technical plastic material supporting assembly cycles of components by reflow.
- the housing 7 is also metallized to carry electrical tracks.
- Ferrule 1 also includes optoelectronic circuits 9 for converting optical signals into electrical signals and / or vice versa.
- the optoelectronic conversion circuits 9, at least of the detection and / or transmission circuits of these conversion circuits, are placed on one face 10 of the housing 7 opposite to the face 6 by which the optical fiber.
- the box 1 also includes an electrical port 11 represented here by a series of studs forming elevations on a face 12 of the box 1.
- the face 12 is contiguous on the one hand with the face 10 and on the other hand with the face 2.
- the optical signals from the optical fibers 3 travel an optical path 13 preferably rectilinear inside the housing 7 between the optical port 2, and therefore the immediate output of the fiber 3, and the conversion circuits 9 on which they produce a direct impact, or from which they come directly, in the two cases without reflection.
- the optical path 13 is materialized in the housing 7 by a solid, liquid or gaseous material transparent to light rays.
- the housing 7 is thus provided with grooves 13 whose orientation is preferably parallel to the pins 8 and is therefore substantially perpendicular to an exit face of the end piece 4 of the optical fibers. 3.
- grooves 13 are aligned so that at their other end 14 they are placed directly opposite and perpendicular to a face 15 for detecting optoelectronic circuits 9.
- the holding means constituted by the grooves 13 can be rectilinear.
- the waveguides replacing the interface fibers can be bent, recombined or separated according to a desired application.
- the integrated circuit 9 for optoelectronic detection or emission and for reshaping the signals is mounted generally on edge, perpendicular to a printed circuit 16 intended to come into contact with the electrical port 11.
- the elevation of the studs 17 in relief of the electrical port 11 also makes it possible to leave room for an air space 18, or for another material, between the integrated circuit 9 and the printed circuit 16 so as to ensure isolation and to guarantee the reliability of assembly of the component.
- the contacts 17 of the electric port can also be secured and electrically connected to a connector element, a counterpart of which is secured to the printed circuit 16 receiving the ferrule.
- the integrated circuit 9 For its electrical connection to the printed circuit 16, the integrated circuit 9 is connected to metallized studs 19 placed on the face 10 of the housing 2. It is connected to them by solder balls such as 20. The solder balls 20 are moreover connected to studs 21 for connection of the integrated circuit 9 itself even.
- the technique of electrical connection of the integrated circuit 9 by solder balls is a technique, called flip chip, in which a reflow of the solder balls is produced.
- the integrated circuit 9 is placed horizontally above the housing 7 after fitting solder balls 20. In this phase, the housing 7 is raised vertically with its face 10 above. Then the whole is brought to a reflow temperature, higher than 260 degrees.
- the solder balls 20 carry out on the one hand the electrical welding of the pads 19 to the pads 21.
- the surface tensions which develop in the solder they ensure an exact positioning of these pads 21 relative to to the pads 19. Therefore, if by construction of the integrated circuit 9 the pads 21 are placed precisely with respect to the access 15 for detection or emission of the electronic circuits 9, and if on the other hand the pads 19 are placed by construction precisely with respect to the outlet orifice 14 of the rectilinear path 13 in the housing 7, then the installation of the electronic circuit 9 is carried out on its own with great precision, in practice of the order of a micrometer. We are then in a configuration in which the alignment is perfect, with a technology well mastered and therefore the result is obtained at low cost.
- FIG. 3 shows the production of electrical tracks 22 making it possible to connect the pads 19 of the housing to the pads 17 of the electrical port 11.
- the metallized tracks 22 can be obtained in different ways. For example, the entire housing is metallized and the tracks 22 are etched there, on all of its faces, by wet etching or by dry etching (with a laser). As a variant, it is possible to carry out a selective attack on the surface of the housing 7, at the location of the tracks 22, so as to chemically activate at the location of these tracks the material of the surface of the housing 7.
- Tracks 22 can thus be produced which are deployed not only on one face 12 of the housing containing the studs 17 but also on one or more other contiguous faces of the housing.
- the tracks have an electrical continuity at the place of the change of face. If necessary, the edges 23 between two contiguous faces 10 and 12 can be rounded to promote the achievement of this electrical continuity.
- the electrical tracks can be of different lengths depending on the distance from the pad 17 that they connect to the face 10.
- the electronic circuit 9 must be supplied with electricity, must receive control or signaling signals, and must transmit signals to be converted optoelectrically or which have been converted optoelectrically.
- We will then choose to reserve tracks such as 24 and 25 whose route on the housing 7 is the longest to ensure electrical routing.
- Intermediate length tracks 26 will be used for the transmission of control or signaling signals, while the shortest tracks 22 will be used for the transmission of the signals detected or to be transmitted.
- the signals to be transmitted or the converted signals available on track 22 are very rapidly variable signals, their variation depends on the bit rate which can be of the order of several gigabits per second.
- the signals conveyed by the connections 26 are less rapidly variable, for example of the order of megahertz, while the signals on the connections 24 and 25 are continuous.
- Tracks 22 and 24 to 26 are preferably produced on external faces of the housing 7.
- FIG. 4 schematically shows in section the housing 7 as well as the electronic circuit 9. It also shows that the housing 7 is formed by two blocks 27 and 28 together.
- the two blocks 27 and 28 are parallelepipedal, like the box 7, and have a height, measured perpendicular to the printed circuit 16, half less than the height 29 of the whole box 7.
- the two blocks 27 and 28 have at the place 30 of their meeting means for making rectilinear optical paths.
- these means will be produced by the presence of V or U-shaped grooves formed in at least one of the two blocks 27 or 28, the other block being able to be deprived of grooves and to be flat.
- These grooves allow, if desired, to have sections of optical fibers or to deposit a resin polymer playing a role of optical waveguide, so as to ensure the light transparency of the housing 7 in their place.
- a step 31 at the level of the face 10 of the housing 7 allows the ends of the sections to be polished without damaging the metallized tracks.
- the housing is a single monoblock. It is then pierced with rectilinear holes in which are, or are not, placed the sections of optical fibers or waveguides.
- the manufacturing method of the housing 7 in two blocks 27 and 28 is preferred because it allows a simpler realization of the rectilinear optical paths.
- the precision of making a groove is greater than the precision of making a hole, the first being able to be much more rectilinear than the other.
- the realization in two blocks allows the realization of paths 13 in the form of a material molded in the grooves before joining the blocks.
- the metallized tracks such as 24 and 25 each produced in part on each of the blocks are joined, after the two blocks 27 and 28 are joined against each other, by electric bridges such as 32.
- These electric bridges are either simple welds, or used to set up complementary circuits, in particular electrical decoupling circuits to avoid the transmission of spurious electronic signals.
- the two blocks 27 and 28 are joined to each other by gluing, or by ultrasonic or laser welding, with or without the presence of optical fibers.
- optical fibers optionally at the location of the port 2 and the optical output 14 can be placed optical lenses. Or else quite simply the sections of optical fibers placed in the holes or in the grooves have rounded shapes at their ends providing a similar lens effect.
- the integrated circuit 9 for detection or transmission and conversion can preferably be produced in the form of two integrated circuits stacked one on the other.
- the integrated circuit 9 comprises a detection (or emission) circuit proper 33.
- the circuit 33 is formed on the basis of VCSEL type diodes.
- the circuit 9 also includes an integrated circuit 34 for analog-to-digital conversion.
- the integrated circuit 34 converts analog electrical signals produced by detector 33 to digital electrical signals, or vice versa if circuit 33 is a transmitter.
- the integrated circuit 33 is connected, by studs not shown, to the integrated circuit 34 by reflow solder balls 35, of the same type as the solder balls 20 so as to ensure precise positioning of this integrated circuit 33 relative to the integrated circuit 34.
- FIG. 5 shows the overall dimensions of the assembly formed by the housing 7 and the optoelectronic integrated circuit 9.
- a ferrule module according to the invention will have, to within 10%, a length of 5 mm, a width of 7 mm and a height of 2 mm.
- FIG. 5 also shows that an upper face 37 of the housing 7, opposite to the face 12 which carries the electrical port 11, can be used to set up other integrated circuits such as 38 in interconnection between, or on, electrical connection tracks.
- the circuits 38 will preferably be passive type circuits, mounted according to a CMS type technology - surface-mounted components.
- FIG. 6 schematically shows a box 7 connected to an electronic circuit 9.
- the electronic circuit 9 has a flat conversion circuit 34 whose surface is substantially parallel to the outlet face 10 of the box 7.
- This construction then allows the establishment of a radiator 39 pressed against the back of the integrated circuit 34, for example by means of an adhesive 40 for thermal transmission.
- an optoelectronic conversion circuit working at very high speed to ensure the flow transmitted by the optical fiber is an organ that produces a significant amount of heat.
- the fact of having placed the circuit integrated 34 on edge, perpendicular to a printed circuit 16 not shown, then makes it possible to place the radiator 39 in a useful manner with its thermal outlet plate perpendicular to the printed circuit 16.
- this assembly is placed in a holding box 41.
- the holding box 41 has on the one hand the optical port 2 and on the other by the electrical port 11, both being placed on faces perpendicular to each other of the housing 7.
- the large number of pads such as 17 allows the housing to be held on the circuit 16. If necessary, some of them are not functional for making electrical connections.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0202247 | 2002-02-21 | ||
| FR0202247A FR2836235B1 (fr) | 2002-02-21 | 2002-02-21 | Ferule de connexion de fibres optiques |
| PCT/EP2003/050021 WO2003071330A1 (fr) | 2002-02-21 | 2003-02-19 | Ferule de connexion de fibres optiques |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1476777A1 true EP1476777A1 (fr) | 2004-11-17 |
Family
ID=27636416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03742582A Withdrawn EP1476777A1 (fr) | 2002-02-21 | 2003-02-19 | Ferule de connexion de fibres optiques |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20050129370A1 (fr) |
| EP (1) | EP1476777A1 (fr) |
| FR (1) | FR2836235B1 (fr) |
| WO (1) | WO2003071330A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8263862B2 (en) * | 2009-02-07 | 2012-09-11 | Linden Photonics, Inc. | Hermetic electrical ports in liquid crystal polymer packages |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0314651A2 (fr) * | 1987-10-30 | 1989-05-03 | International Business Machines Corporation | Convertisseur électro-optique |
| US5367593A (en) * | 1993-09-03 | 1994-11-22 | Motorola, Inc. | Optical/electrical connector and method of fabrication |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US539200A (en) * | 1895-05-14 | Adjustable window-scaffold | ||
| US539848A (en) * | 1895-05-28 | Machine for coating paper with emulsion | ||
| US5168537A (en) * | 1991-06-28 | 1992-12-01 | Digital Equipment Corporation | Method and apparatus for coupling light between an optoelectronic device and a waveguide |
| US5416872A (en) * | 1993-07-06 | 1995-05-16 | At&T Corp. | Arrangement for interconnecting an optical fiber an optoelectronic component |
| US5539200A (en) * | 1994-11-03 | 1996-07-23 | Motorola | Integrated optoelectronic substrate |
| US5539848A (en) * | 1995-05-31 | 1996-07-23 | Motorola | Optical waveguide module and method of making |
| JP3150070B2 (ja) * | 1996-09-30 | 2001-03-26 | 日本電気株式会社 | 受光モジュール及びその製造方法 |
| JPH10319278A (ja) * | 1997-05-16 | 1998-12-04 | Nec Corp | 光結合回路 |
| EP1161700A2 (fr) * | 1999-03-16 | 2001-12-12 | Framatome Connectors International | Connecteur optoelectronique modulaire |
| US6243508B1 (en) * | 1999-06-01 | 2001-06-05 | Picolight Incorporated | Electro-opto-mechanical assembly for coupling a light source or receiver to an optical waveguide |
| US6634802B2 (en) * | 2001-08-09 | 2003-10-21 | International Business Machines Corporation | Optical-electronic array module and method therefore |
-
2002
- 2002-02-21 FR FR0202247A patent/FR2836235B1/fr not_active Expired - Fee Related
-
2003
- 2003-02-19 US US10/504,951 patent/US20050129370A1/en not_active Abandoned
- 2003-02-19 EP EP03742582A patent/EP1476777A1/fr not_active Withdrawn
- 2003-02-19 WO PCT/EP2003/050021 patent/WO2003071330A1/fr not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0314651A2 (fr) * | 1987-10-30 | 1989-05-03 | International Business Machines Corporation | Convertisseur électro-optique |
| US5367593A (en) * | 1993-09-03 | 1994-11-22 | Motorola, Inc. | Optical/electrical connector and method of fabrication |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003071330A1 (fr) | 2003-08-28 |
| US20050129370A1 (en) | 2005-06-16 |
| FR2836235A1 (fr) | 2003-08-22 |
| FR2836235B1 (fr) | 2004-07-02 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
Effective date: 20040730 |
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| AK | Designated contracting states |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FLERS, ALAIN Inventor name: ROSINSKI, BOGDAN Inventor name: STRICOT, YVES Inventor name: ZINDINE, EL MOSTAFA |
|
| 17Q | First examination report despatched |
Effective date: 20061004 |
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| 17Q | First examination report despatched |
Effective date: 20061004 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20071207 |