EP0110917A1 - Method for producing optical fiber access couplers and product produced thereby - Google Patents

Method for producing optical fiber access couplers and product produced thereby

Info

Publication number
EP0110917A1
EP0110917A1 EP19830901690 EP83901690A EP0110917A1 EP 0110917 A1 EP0110917 A1 EP 0110917A1 EP 19830901690 EP19830901690 EP 19830901690 EP 83901690 A EP83901690 A EP 83901690A EP 0110917 A1 EP0110917 A1 EP 0110917A1
Authority
EP
European Patent Office
Prior art keywords
fibers
length
fused
heat
rate
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Withdrawn
Application number
EP19830901690
Other languages
German (de)
French (fr)
Inventor
Kenneth M. Clark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of EP0110917A1 publication Critical patent/EP0110917A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/255Splicing of light guides, e.g. by fusion or bonding
    • G02B6/2552Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/02Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/028Drawing fibre bundles, e.g. for making fibre bundles of multifibres, image fibres
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/26Optical coupling means
    • G02B6/28Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2821Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
    • G02B6/2835Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers

Definitions

  • the present invention relates to fiber optic access couplers and, in particular, an improved coupler structure and an improved method for producing such structure.
  • an access coupler and its method of production is described as comprising a pair of multi-mode optical fibers having a biconical taper section which are twisted around one another and fused together along a predetermined length to provide optical coupling between the fibers.
  • Such an access coupler is produced by applying heat at a stationary point in space to the twisted fibers and moving both ends of the fibers outwardly from the point of fusion, so that the fibers taper down from their ends towards their fused centers.
  • softened glass from either or both ends contributes to the tapers in unknown and uncontrollable proportions.
  • the biconical tapers produced are steeper than what is desirable and, therefore, cause concentration of stress, prevent low tap ratios (e.g., 2% ) from being effectively produced, etc., a tap ratio being the measurement of percentages of the light transmitted to the fibers exiting from the coupler.
  • the rate at which a fiber tapers or necks-down due to the combined elongation as heat is applied should be less than 50%, the rate of taper being defined as the difference in diameters of the fiber as it exists prior to and after elongation, divided by the length of the taper between the unaffected and elongated portions of the fiber.
  • a quantative rate of taper is only approximate since the beginning and end points of the taper are not exactly determinable. Nevertheless, certain conclusions can be drawn therefrom in terms of stress concentration in the flexibility of a fiber and the ability to produce different tap ratios.
  • the length of the fused portion and the rate of taper also affect the ability to obtain a desired tap ratio.
  • typical fused lengths range from a minimum of 0.010 inch to approximately 0.100 inches. For a low tap ratio, e.g., 2% , a smaller fusion length is required, while for a larger tap ratio, e.g., towards 50%, a larger fused length is used.
  • a small tap ratio of 2% is provided when the fused length is about 0.005 Inches; however, while a short length may sufficiently couple the fibers to permit efficient transfer of light (that is, the losses are sufficiently low), the joint does not have enough physical strength to maintain the bond. On the other hand, if the fused length were extended to about 0.010 inch, the tap ratio would become considerably larger than 2% .
  • the present invention avoids and overcomes these and other problems by better control of the taper and the rate of taper. It has been discovered that, if the heat, with respect to the combined fibers, were moved at a percentage of the movement by which the fibers are elongated, the rate of taper could be made more gradual and less steep than heretofore obtained. Such a differential rate may be obtained. In at least two illustrative ways. In a first method, one end of the bundle of fibers is held stationary. Then, while heat is applied to soften the fibers, the heat is moved with respect to the fibers in the same direction as the other end of the fibers is pulled, with the movement of the heat being at a percent of the pulling exerted upon the fibers.
  • the heat may be held stationary while both ends of the bundle are moved away from each other, with one end being moved at a rate which is greater than that movement applied to the other end of the bundle.
  • the preferred ratio of fiber elongation to relative movement between the heat and the fibers has been found to be approximately a 4 to 1 ratio. Ratios greater or lesser than approximately 4 to 1 have not produced the lowest loss in such couplers.
  • FIG. 1 illustrates an optical fiber having a taper therein resulting from heating and elongation thereof
  • FIG. 2 is a first embodiment of a means for carrying out the Invention to form an access coupler of two or more fibers, with each fiber having a taper such as that illustrated in FIG. 1; and
  • FIG. 3 is a second embodiment of apparatus for carrying out the invention.
  • the improved access coupler of the present invention may be described in terms of the rate of taper of each fiber fused together to form the coupler. It is to be understood, however, that such a discussion relating to a rate of taper Is based upon what is presently thought to be the reasons for the improved access coupler of the present invention. Further investigation, therefore, may show that this explanation Is In error or should be modified.
  • the rate of taper of an individual fiber may be defined according to the following equation:
  • FIG. 2 diagrammatically illustrates an actual laboratory setup which was used to obtain the improved access couplers of the present Invention.
  • the entire apparatus was mounted on a fixed plate 10.
  • Immovably secured to plate 10 Is a fixed mount 12.
  • Spaced from mount 12 Is a slide 14 which is reciprocally received within a guide 16, in turn affixed to plate 10.
  • slide 14 has limited reciprocal motion towards and away from mount 12.
  • Secured to mount 12 and slide 14 are a pair of rotatable spools 18 and 20 which are intended to support a plurality of optical fibers 22.
  • the fibers are threaded through spool 18, extended through a coil 24 which acts as a source of heat, and finally threaded through spool 20.
  • fibers 22 are generally parallel to one another as originally threaded through spools 18 and 20 and extended through coll 24. As is conventional in the production of access couplers, it is desired that the fibers be twisted to a desired extent. To obtain the preferred twisting, one or both spools 18 and 20 are twisted in opposite directions from one another, after which a pair of clamps 26 and 28, respectively on mount 12 and slide 14, are clamped about the fibers to maintain them in their prescribed twisted condition. The precise distance between slide 14 and mount 12 is preset by a micrometer screw 30, which is secured to guide 16 and contacts a stop 32 on slide 14. A second micrometer screw 34 is mounted on plate 10 and is adjusted to provide a distance from its tip 35 to stop 32 to set the length at which fibers 22 are to be elongated when fused together.
  • a damper 36 secured to plate 10, Is attached to slide 14 by a connection 38 to ensure that, when slide 14 Initially moves, there is no sudden pull exerted upon the optical fibers which might otherwise fracture or separate them.
  • Coil 24 is mounted on and supported by a second slide 40, which is received within rails or other guiding means which, in turn, are secured to plate 10.
  • Slide 40 Is disposed to reciprocate parallelly and in the same direction with slide 14 so that coil 24 will move in parallel with fibers 22.
  • slides 14 and 40 are mechanically interconnected by a pulley arrangement so that they will move In unison but at different rates.
  • a wire 42 and pulleys interconnect the slides.
  • Wire 42 is secured to slide 14 at attachment 44 and extends about several pulleys 48, 50 and 52 to be attached at a tie-down 46 directly to plate 10. The wire extends about stationary pulleys 48 and 50, all of which are rotatably secured on plate 10.
  • a spring 54 is secured at its ends 56 to slide 40 and plate 10 to exert a common tensile force directly upon slide 40 and Indirectly through the pulley and wire arrangement upon slide 14.
  • FIG. 3 it Is further possible to adjust the ratio or rate of relative movement between the coil and the optical fibers and the lengthening or stretching of the fibers by use of the modification illustrated in FIG. 3.
  • This modification has been devised in part to prevent absolute movement of coil 24 because wires attached thereto are of large gauge and may cause undesired drag upon the slide, such as on slide 40 of FIG. 2. Therefore,
  • one end of optical fiber bundle 22 is affixed to a moveable plate 60 by a fixture 62.
  • Plate 60 Is adapted to move linearly In the direction of arrow M 2 .
  • Reciprocally received on plate 60 Is a slide 64 which moves according to the arrow denoted by indicium M 1 .
  • Optical fibers 22 secured to their respective plate and slide by spools 18 and 20 which may be the same as those depicted in FIG. 2.
  • Respective slidable motions of plate 60 and slide 64 are effected by Individual mechanisms 66 and 68, which comprise conventional motors and gearing.
  • Slide actuating mechanisms 66 and 68 are adapted, either through gearing or variable stepping motors, to cause plate 60 to slide in the direction of arrow M 2 at a rate which Is different from that of slide 64, moving in the direction of arrow M 1 .
  • M 1 moves faster than M 2 to produce the same relative elongation of fibers 22 and movement of fibers 22 with respect to coil 24.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Un coupleur d'accès amélioré est produit à partir d'au moins deux fibres optiques (22) qui sont également allongées sous tension par un coulisseau (14) mobile par rapport à un montage fixe (12) et sont fusionnées par de la chaleur appliquée sur une longueur commune aux deux fibres à l'aide d'une bobine chauffante (24). Un couplage amélioré est obtenu par une conicité graduelle des fibres en déplaçant la chaleur produite par la bobine par rapport aux fibres à une vitesse qui est un pourcentage de la vitesse d'allongement des fibres. Un rapport de quatre à un environ, correspondant à un allongement des fibres de quatre fois le déplacement de la bobine de fusion, s'est révélé produire les coupleurs d'accès ayant la perte la plus faible.An improved access coupler is produced from at least two optical fibers (22) which are also elongated under tension by a slider (14) movable relative to a fixed assembly (12) and are fused by applied heat over a length common to the two fibers using a heating coil (24). Improved coupling is achieved by gradual taper of the fibers by shifting the heat produced by the coil relative to the fibers at a speed which is a percentage of the speed of elongation of the fibers. A ratio of approximately four to one, corresponding to an elongation of the fibers of four times the displacement of the fusion coil, has been found to produce the access couplers having the lowest loss.

Description

METHOD FOR PRODUCING OPTICAL FIBER ACCESS COUPLERS AND PRODUCT PRODUCED THEREBY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to fiber optic access couplers and, in particular, an improved coupler structure and an improved method for producing such structure.
2. Description of the Prior Art and Background Considerations
In U.S. Patent No. 4,291,940, an access coupler and its method of production is described as comprising a pair of multi-mode optical fibers having a biconical taper section which are twisted around one another and fused together along a predetermined length to provide optical coupling between the fibers. Such an access coupler is produced by applying heat at a stationary point in space to the twisted fibers and moving both ends of the fibers outwardly from the point of fusion, so that the fibers taper down from their ends towards their fused centers. In this method, softened glass from either or both ends contributes to the tapers in unknown and uncontrollable proportions. In particular, It Is believed that the biconical tapers produced are steeper than what is desirable and, therefore, cause concentration of stress, prevent low tap ratios (e.g., 2% ) from being effectively produced, etc., a tap ratio being the measurement of percentages of the light transmitted to the fibers exiting from the coupler. Specifically, it is believed that the rate at which a fiber tapers or necks-down due to the combined elongation as heat is applied should be less than 50%, the rate of taper being defined as the difference in diameters of the fiber as it exists prior to and after elongation, divided by the length of the taper between the unaffected and elongated portions of the fiber. A quantative rate of taper is only approximate since the beginning and end points of the taper are not exactly determinable. Nevertheless, certain conclusions can be drawn therefrom in terms of stress concentration in the flexibility of a fiber and the ability to produce different tap ratios.
If the taper is too short and, therefore, too steep, a sudden change in the diameter of the fiber, or rate of taper, will result in a concentration of stresses in the fused fiber. If the stress concentration is too great, the fused joint may facture. On the other hand, a small cross-section of a fiber is more flexible and, therefore, can relieve bending moments exerted on the cross-section. In addition, the length of the fused portion and the rate of taper also affect the ability to obtain a desired tap ratio. In general, typical fused lengths range from a minimum of 0.010 inch to approximately 0.100 inches. For a low tap ratio, e.g., 2% , a smaller fusion length is required, while for a larger tap ratio, e.g., towards 50%, a larger fused length is used.
Utilizing conventional fusion methods, a small tap ratio of 2% is provided when the fused length is about 0.005 Inches; however, while a short length may sufficiently couple the fibers to permit efficient transfer of light (that is, the losses are sufficiently low), the joint does not have enough physical strength to maintain the bond. On the other hand, if the fused length were extended to about 0.010 inch, the tap ratio would become considerably larger than 2% .
Thus, since conventional fusion methods cannot resolve these problems, low tap ratios and reduced stress concentrations have not been obtainable.
SUMMARY OF THE INVENTION
The present invention avoids and overcomes these and other problems by better control of the taper and the rate of taper. It has been discovered that, if the heat, with respect to the combined fibers, were moved at a percentage of the movement by which the fibers are elongated, the rate of taper could be made more gradual and less steep than heretofore obtained. Such a differential rate may be obtained In at least two illustrative ways. In a first method, one end of the bundle of fibers is held stationary. Then, while heat is applied to soften the fibers, the heat is moved with respect to the fibers in the same direction as the other end of the fibers is pulled, with the movement of the heat being at a percent of the pulling exerted upon the fibers. In a second method, the heat may be held stationary while both ends of the bundle are moved away from each other, with one end being moved at a rate which is greater than that movement applied to the other end of the bundle. The preferred ratio of fiber elongation to relative movement between the heat and the fibers has been found to be approximately a 4 to 1 ratio. Ratios greater or lesser than approximately 4 to 1 have not produced the lowest loss in such couplers. Several advantages are derived therefrom. Better control of the steepness of the taper and the length of the fusion is obtained. Small tap ratios with minimum stress concentrations are provided. Coupling losses are minimized.
Other aims and advantages, as well as a more complete understanding of the present invention, will appear from the following explanation of exemplary embodiments and the accompanying drawings thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an optical fiber having a taper therein resulting from heating and elongation thereof; FIG. 2 is a first embodiment of a means for carrying out the Invention to form an access coupler of two or more fibers, with each fiber having a taper such as that illustrated in FIG. 1; and
FIG. 3 is a second embodiment of apparatus for carrying out the invention.
DETAILED DESCRIPTION OF THE INVENTION As described above, the improved access coupler of the present invention may be described in terms of the rate of taper of each fiber fused together to form the coupler. It is to be understood, however, that such a discussion relating to a rate of taper Is based upon what is presently thought to be the reasons for the improved access coupler of the present invention. Further investigation, therefore, may show that this explanation Is In error or should be modified. With reference to FIG. 1, the rate of taper of an individual fiber may be defined according to the following equation:
the rate of taper, where Φ1 is the diameter of the original fiber unaffected by elongation, Φ2 is the smaller fiber diameter which is reduced as a result of elongation, and L is the length of the taper between the terminations of the original and reduced fiber diameters. Such dimensions are illustrated in FIG. 1. Since the taper is not perfectly uniform and its commencement and ending are not perfectly defined, any measurements in the length L of the taper, In particular, are only approximate. However, it Is believed that a rate of taper in excess of 50% is too steep. Alternatively, rates of taper of less than 50% contribute to the improved couplers of the present invention.
FIG. 2 diagrammatically illustrates an actual laboratory setup which was used to obtain the improved access couplers of the present Invention. The entire apparatus was mounted on a fixed plate 10. Immovably secured to plate 10 Is a fixed mount 12. Spaced from mount 12 Is a slide 14 which is reciprocally received within a guide 16, in turn affixed to plate 10. Thus, slide 14 has limited reciprocal motion towards and away from mount 12. Secured to mount 12 and slide 14 are a pair of rotatable spools 18 and 20 which are intended to support a plurality of optical fibers 22. The fibers are threaded through spool 18, extended through a coil 24 which acts as a source of heat, and finally threaded through spool 20.
Initially, fibers 22 are generally parallel to one another as originally threaded through spools 18 and 20 and extended through coll 24. As is conventional in the production of access couplers, it is desired that the fibers be twisted to a desired extent. To obtain the preferred twisting, one or both spools 18 and 20 are twisted in opposite directions from one another, after which a pair of clamps 26 and 28, respectively on mount 12 and slide 14, are clamped about the fibers to maintain them in their prescribed twisted condition. The precise distance between slide 14 and mount 12 is preset by a micrometer screw 30, which is secured to guide 16 and contacts a stop 32 on slide 14. A second micrometer screw 34 is mounted on plate 10 and is adjusted to provide a distance from its tip 35 to stop 32 to set the length at which fibers 22 are to be elongated when fused together.
A damper 36, secured to plate 10, Is attached to slide 14 by a connection 38 to ensure that, when slide 14 Initially moves, there is no sudden pull exerted upon the optical fibers which might otherwise fracture or separate them.
Coil 24 is mounted on and supported by a second slide 40, which is received within rails or other guiding means which, in turn, are secured to plate 10. Slide 40 Is disposed to reciprocate parallelly and in the same direction with slide 14 so that coil 24 will move in parallel with fibers 22. As shown, slides 14 and 40 are mechanically interconnected by a pulley arrangement so that they will move In unison but at different rates. To accomplish this, a wire 42 and pulleys interconnect the slides. Wire 42 is secured to slide 14 at attachment 44 and extends about several pulleys 48, 50 and 52 to be attached at a tie-down 46 directly to plate 10. The wire extends about stationary pulleys 48 and 50, all of which are rotatably secured on plate 10. Another two pulleys 52 are rotatably secured to slide 40. Because of the mechanical arrangement of fixed pulleys 50 and moveable pulleys 52, there is a 4 to 1 mechanical advantage between slides 14 and 40. Specifically, slide 14 is capable of moving four times as fast as slide 40; therefore, optical fiber's 22 will be pulled by slide 14 four times as fast as coil 24 moves with respect to the fibers. The movement of the respective slides are shown by the arrows thereon denoted by indicia M1 and M2 in the relationship of M1 = 4M2. A spring 54 is secured at its ends 56 to slide 40 and plate 10 to exert a common tensile force directly upon slide 40 and Indirectly through the pulley and wire arrangement upon slide 14. Thus, the same force acts upon both slides to move them. While the preferred ratio or rate of movement between slides 14 and 40 is 4 to 1, which has proven to be most advantageous in producing the lowest loss couplers over other experimental ratios of 2 to 1, 3 to 1, and 5 to 1, it is recognized that other arrange ments of pulleys, in particular, different numbers of pulleys 50 and 52, will provide different ratios. For example, a third fixed pulley 50 may be utilized so that fixed point 46 of wire 42 will be on slide 40, rather than to plate 10, to vary the ratio, if that is what is desired.
It Is further possible to adjust the ratio or rate of relative movement between the coil and the optical fibers and the lengthening or stretching of the fibers by use of the modification illustrated in FIG. 3. This modification has been devised in part to prevent absolute movement of coil 24 because wires attached thereto are of large gauge and may cause undesired drag upon the slide, such as on slide 40 of FIG. 2. Therefore, In FIG. 3, one end of optical fiber bundle 22 is affixed to a moveable plate 60 by a fixture 62. Plate 60 Is adapted to move linearly In the direction of arrow M2. Reciprocally received on plate 60 Is a slide 64 which moves according to the arrow denoted by indicium M1. Optical fibers 22 secured to their respective plate and slide by spools 18 and 20 which may be the same as those depicted in FIG. 2. Respective slidable motions of plate 60 and slide 64 are effected by Individual mechanisms 66 and 68, which comprise conventional motors and gearing. Slide actuating mechanisms 66 and 68 are adapted, either through gearing or variable stepping motors, to cause plate 60 to slide in the direction of arrow M2 at a rate which Is different from that of slide 64, moving in the direction of arrow M1. According to the principles of the Invention, M1 moves faster than M2 to produce the same relative elongation of fibers 22 and movement of fibers 22 with respect to coil 24. Thus, the embodiment of FIG. 3 produces the same relative movements as that provided by the mechanism depicted in FIG. 2. In the embodiment of FIG. 3, however, it is easier to adjust the relative ratios of M1 to M2 in order to provide the most optimum relative movements, for example, having such ratios as 4.2 to 1 and 3.7 to 1, If these are found to be even more advantageous in producing even lower loss couplers. In order to detect the amount of heat generated by coll 24, a heat sensor 70, see FIG. 2, is positioned adjacent the coil.
Although the invention has been described with reference to particular embodiments thereof, it should be realized that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

Claims

CLAIMSWhat is Claimed is:
1. In an access coupler having two or more optic fibers fused together at a length thereof, with tapered sections bounding said fused length, the improvement in which said tapered sections have a rate of taper of less than 0.50.
2. The improvement according to Claim 1 in which said fused length Is in excess of 0.005 inches and said fused optic fibers have a tap ratio of less than 25?.
3. In an access coupler having two or more optic fibers fused together at a length thereof with tapered sections bounding said fused length, the Improvement in which said tapered sections have a rate of taper defined by the equation where Φ1 and Φ2 are the diameters of each fiber respectively prior to and following one of said tapered sections and L is the length of said one tapered section.
4. The improvement according to Claims 1 or 3 in which said fused lengths Include said fibers being twisted about one another.
5. In a method for producing an access coupler from at least two optic fibers in which the fibers are concurrently elongated under tension and fused together by heat applied thereto along a combined length thereof, the Improvement comprising the step of moving the heat with respect to the fibers at a rate which is different from the rate at which the fibers are elongated.
6. The improvement according to Claim 5 further comprising the steps of securing the combined fiber length at its respective ends, positioning the heat intermediate the secured ends, and placing the tension on only a first of the ends while holding the second of the ends stationary, said moving step comprising the step of moving the heat along the fiber length towards the first end.
7. The improvement according to Claim 5 further comprising the steps of securing the combined fiber length at Its respective ends and positioning the heat intermediate the secured ends, said moving step comprising the step of moving the ends away from each other at the differential rate.
8. The improvement according to Claims 5, 6 or 7 in which the differential rate is about 25%, so that the elongation causes the fibers at one of their ends to move about four times faster than the heat moves with respect to the fibers.
9. In a method for producing an access coupler from at least two optic fibers in which the fibers are concurrently elongated and bonded together by heat to form a fused length bounded by tapers, the Improvement wherein movement between the heat and the respective tapers is at a ratio greater than one to one.
10. The improvement according to Claim 9 further comprising the step of setting the ratio at approximately four to one.
EP19830901690 1982-06-07 1983-05-02 Method for producing optical fiber access couplers and product produced thereby Withdrawn EP0110917A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38598282A 1982-06-07 1982-06-07
US385982 1982-06-07

Publications (1)

Publication Number Publication Date
EP0110917A1 true EP0110917A1 (en) 1984-06-20

Family

ID=23523680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901690 Withdrawn EP0110917A1 (en) 1982-06-07 1983-05-02 Method for producing optical fiber access couplers and product produced thereby

Country Status (2)

Country Link
EP (1) EP0110917A1 (en)
WO (1) WO1983004409A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8328238D0 (en) * 1983-10-21 1983-11-23 Bicc Plc Optical fibre splicing
GB8808856D0 (en) * 1988-04-14 1988-05-18 Bicc Plc Optical fibre coupler manufacture
JPH02137806A (en) * 1988-11-18 1990-05-28 Japan Aviation Electron Ind Ltd Manufacture of optical fiber coupler

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291940A (en) * 1977-06-13 1981-09-29 Canadian Patents & Development Ltd. Low loss access coupler for multimode optical fiber distribution systems
JPS56153309A (en) * 1980-04-30 1981-11-27 Toshiba Corp Working device for tapered optical fiber
DE3034873A1 (en) * 1980-09-16 1982-03-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Tapering of optical waveguide fibres - by combined use of heating and drawing, where heater is driven along fibre during drawing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8304409A1 *

Also Published As

Publication number Publication date
WO1983004409A1 (en) 1983-12-22

Similar Documents

Publication Publication Date Title
US5216731A (en) Fused biconical taper fiber optic coupler station and fabrication techniques
EP0232520B1 (en) Method of making two guiding grooves that are exactly in line
US5092117A (en) Method of and an apparatus for producing an optical multi-fiber cable element
DE69916079T2 (en) METHOD AND DEVICE FOR TURNING A COATED OPTICAL FIBER DURING PULLING FROM A PRESENTATION
US5309536A (en) Process for producing an optical fiber coupler
US5305404A (en) Fiber optic coupler
US5102584A (en) Method of and apparatus for producing an optical multi-fibre cable element
EP0110917A1 (en) Method for producing optical fiber access couplers and product produced thereby
EP0440926A1 (en) Method for fabricating a basic element for information transmission cables with light waveguides
EP0521482A1 (en) Fiber coupler manufacturing apparatus having an automatic breaking test device
US6591041B2 (en) Optical fiber coupler, manufacturing method and apparatus thereof
US4204852A (en) Method of and apparatus for producing a glass fibre bundle for use in optical communications systems
DE3034873A1 (en) Tapering of optical waveguide fibres - by combined use of heating and drawing, where heater is driven along fibre during drawing
CN1016105B (en) Method for manufacturing single mode optical fibres by directional couplers
CN219641428U (en) Tensile testing device for processing layer-stranded optical cable
JPS63118705A (en) Optical fiber coupler producing device
GB2001050A (en) Method of and apparatus for producing a glass fibre bundle for use in optical communications systems
JPS5667806A (en) Manufacture for optical fiber bundle for image transmission
JP3140114B2 (en) Optical fixed attenuator
AU635085B2 (en) A method of and an apparatus for producing an optical multi-fibre cable element
SU1744677A1 (en) Installation for welding optical splitters
JPS60189706A (en) Branching device for multicore optical fiber
CN1890589A (en) Optical fiber coupler and process and device for producing the same
JPH07181355A (en) Vertical collecting device for optical fiber cable
US20030188555A1 (en) Fused bi-conical coupler pulling technique

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

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

18D Application deemed to be withdrawn

Effective date: 19840508

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CLARK, KENNETH M.