GB2049220A - Optical fiber terminator and means and method for centering optical fiber - Google Patents
Optical fiber terminator and means and method for centering optical fiber Download PDFInfo
- Publication number
- GB2049220A GB2049220A GB8013776A GB8013776A GB2049220A GB 2049220 A GB2049220 A GB 2049220A GB 8013776 A GB8013776 A GB 8013776A GB 8013776 A GB8013776 A GB 8013776A GB 2049220 A GB2049220 A GB 2049220A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terminal member
- outer coating
- connector
- core
- fiber optic
- 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.)
- Granted
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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3855—Details of mounting fibres in ferrules; Assembly methods; Manufacture characterised by the method of anchoring or fixing the fibre within the ferrule
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
- G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Means for and method of properly positioning optical fibers 14 with respect to connectors, for optically coupling fiber optic cables 12 wherein the cable includes an outer coating and an inner fiber core. A terminal member 18, 20 is provided which includes a body having a through hole extending axially therethrough. The through hole has a first portion 26 extending through a forward mating end of the terminal member, and is sized to snugly receive a length of the fibre core 14 to properly position the core with respect to the mating end of the terminal member. The through hole has a second portion 28, 30 rearwardly of the first portion which is sized sufficiently larger than the outer coating of the fiber optic cable to accommodate any eccentricity between the fiber core and the coating. The outer coating is fixedly secured within the second portion of the through hole. <IMAGE>
Description
SPECIFICATION
Optical fiber connector and means and method for centering optical fiber
BACKGROUND OF THE PRIOR ART
This invention relates generally to fiber optic connectors and, more specifically, to a separable in-line fiber optic connector for coupling a pair of fiber optic cables or a single fiber optic cable and a light source or detector. The terminal end surface of an inner fiber core for use in lightwave transmission must be flat and highly polished to minimize insertion losses.
The inner fiber core typically must also be axially, laterally, and angularly aligned within certain parameters to extablish an excellent optical coupling between two fiber optic cables. The success achieved in the developement and production of fiber cables has therefore focused strongly upon low loss connectors and couplers for such cables including inline connectors. The ability to design, manufacture, deploy and service a data transmission line, for instance, requires suitable connectors in order to assure the continued progress of the fiber optics field. Accordingly, connectors for this and other applications must be developed which can be used without any significant increase in insertion losses.
Many fiber optic connectors presently available are precision, expensive instruments providing very low insertion losses but they are designed for certain applications such as long distance applications in telephonic systems and in other applications requiring extremely low insertion losses where expensive low loss connectors may be employed. It has been found, however, that expensive low loss connectors are not always well suited for applications requiring a large number of connectors where very expensive connectors are not economically feasible.For instance, in such app Ii- cations as computers and other data transmission application, a large number of fiber optic cables are employed and there is a need for low cost, low loss fiber optic connectors which minimizes insertion losses due to off-centering of the fiber core relative to the connector or terminal member. It is well known in such applications to used low cost fiber optic cables in which the inner fiber core is often not concentric with the outer coating or cladding.
Of course, this non-concentricity has a tendnecy to lead to excessive insertion losses when a connector that utilizes the outer or cladding as a jigging surface is put into a data transmission line.
As stated above, alignment of the fiber core is important to minimize insertion losses, but most connectors which are effective to properly position or center the core with respect to the mating terminal end of the connector or terminal member are very expensive instrumants. This invention is directed to solving these problems by providing a new and improved fiber optic connector and means and method of centering or properly positioning optical fibers or inner fiber cores of fiber optics cables with respect to the mating terminal end of the connector.
BRIEF SUMMARY OF THE INVENTION
Accordingly, a principle object of the present invention is to provide a new and improved low cost, low loss, separable in-line fiber optic connector adapted for coupling a pair of fiber optic cables in a single fiber optic cable and a light source or detector.
Another object of the invention is to provide a fiber optic connector which includes new and improved, simple and inexpensive means associated with the connector for properly positioning or centering an optical fiber or fiber core of a fiber optic cable with respect to the mating end of the connector.
A further object of the invention is to provide a means or method of centering an optical fiber or fiber core of a fiber optic cable in a fiber optic connector.
In using optical fibers, such as a plastic clad silica fiber, the inner core or optical fiber often is not concentric with the outer diameter of the plastic cladding or outer coating. This non-concentricity leads to excessive insertion losses when a connector is put into a line that utilizes the outer diameter of the cladding or coating as a jigging means or surface. The present invention provides a fiber optic connector for optical coupling of a pair of fiber optic cables or a single fiber optic cable and a light source or detector, wherein the cable includes an outer coating and an inner fiber core which may or may not be concentric with the outer coating.The connector of the present invention mitigates against insertion losses by assuring that the fiber core is aligned with respect of the mating end of the connector, independently of the non-concentricity between the core and the outer diameter of the coating or cladding.
More particularly, the fiber optic connector of the present invention includes a terminal member having a through hole extending axially therethrough. The through hole has a first portion extending through a forward mating end of the terminal member. The first portion of the through hole is sized to snugly receive a length of the fiber core stripped of the outer coating to properly position the core with respect to the forward mating end of the terminal member. The through hole includes a second portion rearwardly of the first portion for receiving the outer coating. The second portion is sized sufficiently larger than the outer coating of the fiber optic cable to accommodate any eccentricity between the fiber core and the outer coating.Means is provided for fixedly securing the outer coating of the fiber optic cable within the second portion of the through hole to maintain the core properly positioned with respect to the forward mating end of the terminal member.
In the exemplary embodiment disclosed herein, the first portion of the through hole is formed in a reduced boss portion of the terminal member and protrudes outwardly from a body portion of the terminal member.
The means for fixedly securing the outer coating of the fiber optic cable within the second portion of the through hole comprises an epoxy material. After the epoxy hardens, the boss position is removed from the body portion of the terminal member, leaving the core properly positioned or centered in the terminal member, particularly with respect to the mating end of the terminal member. Of course, more than one through hole may be provided in a single terminal member body portion to accommodate a plurality of fiber optic cables.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the present invention which are believed to be novel are set forth with particularlity in the appended claims. The invention, together with the further objects and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings.In the drawings, like reference numerals identify like elements in the several figures, in which:
Figure 1 shows a front perspective view of the fiber optic connector of the present invention having a pair of fiber optic cables terminated therein with the centering or positioning boss removed;
Figure 2 is a vertical sectional view through the fiber optic connector and one of the through holes thereof, with the top portion of the connector removed;
Figure 3 is an end elevational view looking in the direction of arrows 3-3 of Fig. 2;
Figure 4 is a vertical sectional view similar to that of Fig. 2, with an inner fiber core of a fiber optic cable properly positioned so that a stripped portion of the core extends through the centering boss;;
Figure 5 is a vertical sectional view similar to that of Fig. 4, with epoxy material surrounding an outer coating of the fiber optic cable within the connector, with the top portion of the connector in proper position;
Figure 6 is a vertical sectional view taken generally along the line 6-6 of Fig. 5;
Figure 7 is a vertical sectional view similar to that of Fig. 5, with the centering boss and associated portions of the fiber optic cable removed, leading the inner fiber core properly positioned in the terminal member; and
Figure 8 ia an end elevational view looking generally in the direction of arrows 8-8 in
Fig. 7.
DETAILED DESCRIPTION OF THE INVEN
TION
Referring to the drawings in greater detail, a separable in-line fiber optic connector is shown generally designated 10 in Fig. 1 which is designed to receive and terminate a pair of fiber optic cables 1 2. However, the connector may be designed to receive and terminate a single fiber optic cable or a plurality thereof more than the two cables shown.
Referring to Figs. 4 and 5, the cable 12, prior to assembly to the hole is disposed adjacent to or rearwardly of the first portion 26 for receiving the outer coated or cladded portion 1 6 of the fiber optic cable 1 2. The second portion 28 of the through hole is oversized or sized sufficiently larger than the outer coating 1 6 to accommodate any eccentricity between the fiber core 14 and the outer diameter of the coating 1 6. The third portion 30 of the through hole is provided to accommodate the remaining, rearwardly extending portion of the fiber optic cable 1 2. Of course, it is contemplated that a through hole which would include only the first and second portions 26 and 28, respectively, may be utilized for centering purposes.
The assembly of the fiber optic cable 1 2 within the respective portions 26, 28 and 30 of the through hole is best seen by first referring to Fig. 4. After this step of assembly, means is provided in the form of an epoxy material 32 for fixedly securing the outer coating 1 6 within the second portion 28 of the through hole. The top half 20 of the body portion of the terminal member 10 then is placed in position as shown in Fig. 5. Upon hardening of the epoxy material 32, the outer coating 1 6 will be fixedly secured in place within the connector to maintain the fiber core
14 properly positioned or centered with respect to the forward mating end of face 24 or the terminal member 10.The top half 20 of the terminal member also will be fixed in place about the coating 1 6 of cable 1 2.
The next step of the present invention is shown best in Fig. 7 and comprises the procedure of removing the centering boss 22 and associated fiber core, or optical fiber 14 and plastic cladding, or outer coating of the fiber optic cable 1 2 as shown by the phantom lines in Fig. 7. After the boss and cable portions are removed, as by shearing, the fiber optic connector 10, is stripped so that a length of its inner fiber core 14 and a length of the cladding or outer coating 1 6 about the core -14 are exposed, as shown, in order to be properly received within the connector as described in greater detail hereinafter. The connector 10 includes a terminal member or body portion which includes a lower "half" 1 8 and an upper "half" 20.
Referring to Figs. 2 through 7, the body portion of the terminal member 10 initially is provided with a centering boss 22 molded
integrally with the forward or mating end 24 which is defined by the forward end of the lower half 1 8 of the body portion of the terminal member. The centering boss 22 is reduced in size and protrudes outwardly or forwardly of the terminal mating end 24. In the examplary embodiment of the invention, a centering boss 22 is provided for each fiber optic cable as best shown in the end elevational view of Fig. 3, but it is contemplated that a single boss may be provided for multiple fibers.
The terminal member 10 includes a through hole extending axially therethrough. The through hole includes a first portion 26 (see particularly Fig. 2), a second portion 28, and a third portion 30. The first portion 26 of the through hole extends through the centering boss 22 and is sized to snuggly receive the length of the fiber core 14 stripped of the outer coating 1 6 of the fiber optic cable 1 2 to properly position the core with respect to the forward mating end or face 24 of the terminal member 1 0. The second portion 28 of the through hole is disposed adjacent to or rearwardly of the first portion 26 for receiving the outer coated or cladded portion 1 6 of the fiber optic cable 1 2. The second portion 28 of the through hole is oversized or sized sufficiently larger than the outer coating 1 6 to accommodate any eccentricity between the fiber core 14 and the outer diameter of the coating 1 6. The third portion 30 of the through hole is provided to accommodate the remaining, rearwardly extending portion of the fiber optic cable 1 2. Of course, it is contemplated that a through hole which would include only the first and second portions 26 and 28, respectively, may be utilized for centering purposes.
The assembly the fiber optic cable 12 within the respective portions 26, 28 and 30 of the through hole is best seen by first referring to Fig. 4. After this step of assembly, means isprovided in the form of an epoxy material 32 for fixedly securing the outer coating 1 6 within the second portion of the terminal member 10 then is placed in position as shown in Fig. 5. Upon hardening of the epoxy material 32, the outer coating 1 6 will be fixedly secured in place within the connector to maintain the fiber core 1 4 properly positioned or centered with respect to the forward mating end or face 24 or the terminal member 10.The top half 20 of the terminal member also will be fixed in place about the coating 1 6 of cable 1 2.
The next step of the present invention is shown best in Fig. 7 and comprises the procedure of removing the centering boss 22 and associated fiber core or optical fiber and plastic cladding or outer coating 1 6 of the fiber optic cable 1 2 as shown by the phantom lines in Fig. 7.After the boss and cable portions are removed, as by shearing, the fiber optic cable 1 2 is properly positioned in the terminal member 10 with the core 14 properly centered with respect to the mating end or face 24, as shown in Fig. 6, not withstanding any eccentricity between the core 1 4 and the outer diameter of the outer coating 1 6. The end of the terminal member 10 then can be properly polished for in-line coupling of a pair of fiber optic cables or a single fiber optic cable and a light source or detector.
It is readily apparent from the above description of the present invention, including the overall fiber optic connector structure as well as the means and method of centering optical fibers, that the centering of the fiber core 14 with respect to the mating end of the terminal member 10 is not dependent upon the precise positioning of a jigging surface, such as the inner diameter of the through hole portion 28, as is prevalent in many fiber optic connectors presently available. In addition, other extraneous jigging means as is prevalent in many expensive optical fiber connectors or "instruments" is eliminated.Thus, with the present invention, it is contemplated to provide a fiber optic connector and centering means, wherein a terminal member simply includes first means for receiving the length of the fiber core 14 stripped of its outer coating 1 6 to properly position or center the core with respect to the mating end of the terminal member and second means for receiving the adjacent outer coated portion 1 6 of the fiber optic cable 1 2. Further, means for fixedly securing the outer coated portion 1 6 in the second means to maintain the fiber core 1 4 properly positioned with respect to the mating end of the terminal member 10 irrespective of any eccentricity between the fiber core 14 and the outer coated portion 1 6 is provided.
Epoxy material 32 has been shown as one form of providing the securing means.
While in the foregoing specification a detailed description of the invention has been set forth for purposes of illustration, variation of the details herein given may be made by those skilled in the art without departing from the spirit and scope of this invention.
Claims (14)
1. A method of properly positioning the inner fiber core of a fiber optic cable relative to the mating end of a fiber optic connector, wherein the inner core may or may not be concentric with the outer coating of the fiber optic cable, comprising the steps of: properly positioning a length of said core, stripped of said outer coating, with respect to said mating end of said connector; and securing a portion of said coating to said connector while said core is so properly positioned, thereby maintaining the proper positioning of said core in said connector with respect to said mating end thereof.
2. The method as claimed in Claim 1, including the step of stripping said outer coating from said length of said core prior to said positioning step.
3. The method as claimed in Claim 1, wherein said securing step includes bonding said outer coating portion to said connector by using an epoxy material or the like.
4. The method as claimed in Claim 1, wherein said fiber optic connector includes means for perforrning, said positioning step for said core, and including the step'of removing sai-Clpositioning means after said outer coating, portion is secured to said connector.
5. A fiber optic;connector for óptically coupling a pair of fiber optic cables or a single fiber optic cable and a light source or detector, wherein said cable includes an outer coating and an inner fiber core which may or may not be concentric with the outer coating, comprising: a terminal member having first means for receiving a length of said fiber core stripped of said outer coating and properly positioning said core with respect to a mating end of said termainal member, and having second means for receiving said outer coating of said fiber optic cable; and means for fixedly securing said outer coating of said fiber optic cable with respect to said means to thereby maintain said fibre core in said proper position with respect to said mating end of said terminal member irrespective of any eccentricity between said fiber core and said outer coating.
6. The connector as claimed in Claim 5, wherein said first means of said terminal member for receiving said fiber core comprises a through -hole extending through said mating end of said terminal member.
7. The connector as claimed in Claim 6, wherein said through hole of said first means is formed in a boss portion of said terminal member protruding ourwardly from a body portion of said terminal member, whereby said boss portion can readily be removed from said body portion leaving said fiber core properly positioned in said terminal member.
8. The connector as claimed in Claim 7, wherein said boss portion of said terminal member is formed integrally with said body portion.
9. The connector as claimed in Claim 5, wherein said securing means comprises an epoxy material or the like for bonding said outer coating to said terminal member while said fiber core is properly positioned with respect to said mating end of said terminal member.
1 0. The connector as claimed in Claim 5, wherein said second means of said terminal member for receiving said outer coating comprises a through hole sufficiently oversized with respect to said coating to accommodate any said eccentricity between said fiber core and said coating.
11. The connector as claimed in Claim 10, wherein said through hole of said second means is formed in a boss portion of said terminal member protruding outwardly from a body portion of said terminal member, whereby said boss portion can readily be removed from said body portion leaving said outer coating in said terminal member.
12. The connector as claimed in Claim 6, wherein said first means comprises a first portion of said through hole extending through a forward mating end of said terminal member, said first portion being sized to snugly receive a length of said fiber core stripped of said outer coating to properly position said core with respect to said forward mating end of said terminal member, and said second means comprises a second portion of said through hole rearwardly of said first portion for receiving said outer coating of said fiber optic cable, said second portion being sized sufficiently larger than said outer coating to accommodate any eccentricity between said fiber core and said outer coating.
13. The connector as claimed in Claim 12, wherein said first portion of said through hole is formed in a boss portion of said terminal member protruding ourwardly from a body portion of said terminal member, whereby said boss portion can readily be removed from said body portion leaving said fiber core properly positioned in said terminal member and wherein at least a length of said second portion of said through hole is disposed within said boss.
14. The connector as claimed in Claim 12, including a plurality of said through holes extending through said forward mating end of said terminal member and each having a first and a second portion sized to receive said fiber core and said outer coating respectively, of a fiber optic cable whereby each said fiber core is individually properly positioned with respect to said terminal member.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3726079A | 1979-05-09 | 1979-05-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2049220A true GB2049220A (en) | 1980-12-17 |
| GB2049220B GB2049220B (en) | 1983-06-15 |
Family
ID=21893366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8013776A Expired GB2049220B (en) | 1979-05-09 | 1980-04-25 | Optical fibre terminator and means and method for centering optical fibre |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS564114A (en) |
| CA (1) | CA1132388A (en) |
| DE (1) | DE3016521A1 (en) |
| FR (1) | FR2456335B1 (en) |
| GB (1) | GB2049220B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2503384A1 (en) * | 1981-04-03 | 1982-10-08 | Lignes Telegraph Telephon | Optical fibre bundle end protector - has elastomer sleeve with protruding flexible tubular sheaths to enclose individual fibres |
| EP0063506A1 (en) * | 1981-04-03 | 1982-10-27 | Lignes Telegraphiques Et Telephoniques L.T.T. | Protection device for open optical fibres at the end of a cable element, cable element with said device, and application of such a cable element |
| FR2506956A1 (en) * | 1981-05-26 | 1982-12-03 | Lignes Telegraph Telephon | Optical fibre bundle end protector - has elastomer sleeve with protruding flexible tubular sheaths to enclose individual fibres |
| GB2191871A (en) * | 1986-06-12 | 1987-12-23 | Plessey Co Plc | Optical fibre cable termination |
| GB2246875A (en) * | 1990-06-05 | 1992-02-12 | Seiko Instr Inc | Making an optic fibre-termination |
| GB2263558A (en) * | 1992-01-21 | 1993-07-28 | Methode Electronics Inc | Moulded plastics optic fibre ferrule |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553813A (en) * | 1983-05-16 | 1985-11-19 | International Business Machines Corporation | Fiber optic connector system for integrated circuit modules |
| US5109452A (en) * | 1990-07-16 | 1992-04-28 | Puritan-Bennett Corporation | Electrical-optical hybrid connector |
| FR2669155A1 (en) * | 1990-07-16 | 1992-05-15 | Puritan Bennett Corp | Hybrid electrooptical connector |
| DE29914825U1 (en) * | 1999-08-26 | 2000-06-08 | L & H Kabeltechnik Gmbh | Apparatus for performing a cable end surface finishing process |
| DE10131273C1 (en) * | 2001-06-28 | 2002-12-05 | Framatome Connectors Int | Light waveguide plug connector arrangement, has plug casing attached to one fiber end with plug casing components connected to each other irreversibly and movably by flexible straps |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2175547B1 (en) * | 1972-03-13 | 1978-12-08 | Fort Francois | |
| FR2313687A1 (en) * | 1975-03-28 | 1976-12-31 | Thomson Csf | CONNECTOR FOR OPTICAL FIBER HARNESS |
| DE2615389A1 (en) * | 1975-04-18 | 1976-10-21 | Bunker Ramo | OPTICAL-ELECTRONIC CONNECTION |
| GB1480445A (en) * | 1975-05-06 | 1977-07-20 | Standard Telephones Cables Ltd | Termination of optical fibres |
| DE2522804A1 (en) * | 1975-05-22 | 1976-12-02 | Siemens Ag | Connection device for incoming and outgoing optical fibre cable - has ends of optical fibres held in guiding device |
| US4133601A (en) * | 1975-11-21 | 1979-01-09 | Thomson-Csf | Optical fibers bundle positioning ferrule |
| US4045121A (en) * | 1976-01-22 | 1977-08-30 | The Deutsch Company Electronic Components Division | Optical fiber connector |
| FR2344853A1 (en) * | 1976-02-27 | 1977-10-14 | Thomson Csf | FIBER OPTIC CABLE INTERCONNECTION SHEET |
| NL172188C (en) * | 1977-02-11 | 1983-07-18 | Deutsch Co Elec Comp | SYSTEM FOR COUPLING AN OPTICAL FIBER TO AN OPTICAL COMPONENT THAT PROVIDES OR RECORDS OPTICAL ENERGY. |
| GB1576459A (en) * | 1977-04-28 | 1980-10-08 | Standard Telephones Cables Ltd | Optical fibres connectors |
| DE2837016C2 (en) * | 1978-08-24 | 1982-04-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method for centering optical fiber ends in socket tubes |
-
1980
- 1980-04-25 GB GB8013776A patent/GB2049220B/en not_active Expired
- 1980-04-29 DE DE19803016521 patent/DE3016521A1/en not_active Ceased
- 1980-05-07 FR FR8010351A patent/FR2456335B1/en not_active Expired
- 1980-05-08 JP JP6006380A patent/JPS564114A/en active Pending
- 1980-05-08 CA CA351,546A patent/CA1132388A/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2503384A1 (en) * | 1981-04-03 | 1982-10-08 | Lignes Telegraph Telephon | Optical fibre bundle end protector - has elastomer sleeve with protruding flexible tubular sheaths to enclose individual fibres |
| EP0063506A1 (en) * | 1981-04-03 | 1982-10-27 | Lignes Telegraphiques Et Telephoniques L.T.T. | Protection device for open optical fibres at the end of a cable element, cable element with said device, and application of such a cable element |
| US4697873A (en) * | 1981-04-03 | 1987-10-06 | Lignes Telegraphiques Et Telephoniques | Device for protecting optical fibers freed at the end of a cable element |
| FR2506956A1 (en) * | 1981-05-26 | 1982-12-03 | Lignes Telegraph Telephon | Optical fibre bundle end protector - has elastomer sleeve with protruding flexible tubular sheaths to enclose individual fibres |
| GB2191871A (en) * | 1986-06-12 | 1987-12-23 | Plessey Co Plc | Optical fibre cable termination |
| GB2191871B (en) * | 1986-06-12 | 1989-12-06 | Plessey Co Plc | Improvements relating to optical fibre cable termination |
| GB2246875A (en) * | 1990-06-05 | 1992-02-12 | Seiko Instr Inc | Making an optic fibre-termination |
| GB2246875B (en) * | 1990-06-05 | 1994-07-13 | Seiko Instr Inc | Method of making an optical fibre termination |
| US5464361A (en) * | 1990-06-05 | 1995-11-07 | Seiko Instruments Inc. | Method of making fiber termination |
| GB2263558A (en) * | 1992-01-21 | 1993-07-28 | Methode Electronics Inc | Moulded plastics optic fibre ferrule |
| GB2263558B (en) * | 1992-01-21 | 1995-09-13 | Methode Electronics Inc | Method of making a fiber optic connector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3016521A1 (en) | 1980-11-13 |
| GB2049220B (en) | 1983-06-15 |
| JPS564114A (en) | 1981-01-17 |
| FR2456335A1 (en) | 1980-12-05 |
| CA1132388A (en) | 1982-09-28 |
| FR2456335B1 (en) | 1986-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |