WO2004017115A1 - Virole pour fibre optique - Google Patents

Virole pour fibre optique Download PDF

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Publication number
WO2004017115A1
WO2004017115A1 PCT/SE2002/001355 SE0201355W WO2004017115A1 WO 2004017115 A1 WO2004017115 A1 WO 2004017115A1 SE 0201355 W SE0201355 W SE 0201355W WO 2004017115 A1 WO2004017115 A1 WO 2004017115A1
Authority
WO
WIPO (PCT)
Prior art keywords
ferrule
fiber
optical fiber
guide
fiber guide
Prior art date
Application number
PCT/SE2002/001355
Other languages
English (en)
Inventor
Anders Sjöberg
Original Assignee
Sjoeberg Anders
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 Sjoeberg Anders filed Critical Sjoeberg Anders
Priority to AU2002324389A priority Critical patent/AU2002324389A1/en
Priority to PCT/SE2002/001355 priority patent/WO2004017115A1/fr
Publication of WO2004017115A1 publication Critical patent/WO2004017115A1/fr

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
    • G02B6/3834—Means for centering or aligning the light guide within the ferrule
    • G02B6/3843—Means for centering or aligning the light guide within the ferrule with auxiliary facilities for movably aligning or adjusting the fibre within its ferrule, e.g. measuring position or eccentricity

Definitions

  • the invention relates to a fiberoptical ferrule and a method and a device for mounting an optical fiber or a fiber insert in such a ferrule.
  • optical fibers for transferring signals, i.e. in fiberoptical communication systems
  • alignment of the fibers is required. It means that the ends of the optical fibers have to be aligned with each other or with input/output surfaces of optical components. Without such an accurate alignment a too large attenuation can be obtained in splices between optical fibers or in the transition region between a fiber and an optical component.
  • connectors permanently attached to the ends of the fibers can be used.
  • Such connectors can in the typical case contain a guide sleeve, also called a ferrule, in particular a fiberoptical ferrule, to provide the accurate positioning, in particular in the transverse direction of the fibers.
  • the ferrule also has outer guiding surfaces for guiding the ferrule in relation to connectors that include the same type of ferrule, and also these guiding surfaces must be made with a high mechanical precision.
  • the precision of the ferrule and the fiber end retained therein must be so good that an attenuation of 0 - 0.5 dB in the splice or the transition region is obtained.
  • the high mechanical precision results in that the cost of a ferrule including an optical fiber mounted therein is relatively high.
  • an axial channel or axial hole or bore is provided for the optical fi- ber, the channel or bore having a diameter larger than that of the optical fiber or than the outer diameter of a fiber guide in which the fiber is mounted or is to be mounted and thus allows that the fiber can move somewhat laterally in the channel.
  • At least one recess or at least one hole extends through the material surrounding the channel in to the channel in a substantially radial direction. Using active manipulation through this recess or hole the optical fiber or fiber guide is moved in a controlled way to a desired lateral position in the channel while an adhesive or some similar curable mass has been introduced or is being introduced in the space between the fiber or the fiber guide and the walls of the channel.
  • the fiber or fiber guide respectively is maintained in the desired position until the adhesive or the curable mass has been transferred into a solid state, i.e. has been cured.
  • the manipulation through the hole can be accomplished using an arm of a tool, the arm introduced into the hole and capable of gripping the fiber or fiber guide, for example using vacuum such as in a vacuum chuck.
  • a plurality of recesses or holes can be used extending radially in to the channel and placed in the same plane perpendicular to the channel and the fiber or fiber guide. In these recesses or holes supporting arms belonging to the tool and cooperating with each other can be introduced to displace the fiber laterally to a desired position.
  • the desired position is determined by outer mechanical guide surfaces of the ferrule. Therefore, the ferrule can be manufactured having a not too high precision, in particular as to the diameter and the centering of the axial channel. The only requirement is that the axial channel or bore allows a displacement of an introduced fiber of fiber guide to for example a well centered position. Since thereby the manufacturing cost of the ferrule can be significantly reduced, also the total cost of the combined component fiber and ferrule mounted at an end thereof, i.e. generally a fiber including a mounted connector, is reduced.
  • the optical fiber can in some simple way be positioned having its end well located in the same plane as the front surface of the ferrule. It reduces the time required for polishing the end surface and the front surface. Also, due to this feature, the cost of the combined component fiber and ferrule is reduced.
  • a ferrule of the same type but having an adapted diameter of the channel can be used for receiving a fiber guide having the shape of for example a hole fiber acting as an accurate guide, as well as generally an inner guide sleeve for an optical fiber, which then can be detachably mounted in the hole in the hole fiber or fiber guide.
  • the ferrule can be made from transparent plastics material, for example curable plastics material, or also from for example metal.
  • the adhesive or curable mass surrounding the fiber in the channel can be the UV-curable type, i.e. the type that is cured when exposed to ultraviolet light.
  • Fig. 1 is a schematic side view partly in a cross sectional view of device for mounting an optical fiber in an accurately determined position in a ferrule
  • - Fig. 2 is a perspective view of the end of a positioning arm holding an optical fiber
  • - Fig. 3 is a side view, partly in a cross sectional view, showing parts corresponding to those illustrated in Fig. 2,
  • FIG. 4a and 4b are schematic views of the front side of a ferrule having an optical fiber located therein,
  • FIG. 5 is a schematic cross sectional view of a portion at the front surface of a ferrule having an optical fiber mounted therein,
  • Fig. 6a is a cross sectional view of a ferrule having a hole for positioning arms
  • FIG. 6b is a perspective view of the front portion of the ferrule of Fig. 6a.
  • Fig. 7 is a view similar to Fig. 1 but including a ferrule in which a hole fiber acting as a fiber guide is to be mounted in an accurately determined position.
  • a device for mounting an optical fiber 1 in a desired position in a ferrule 3 is shown.
  • the ferrule 3 is part of or forms an optical connector and includes at its front end an outer mechanical guide surface 5 having a cylindrical shape that at its rear end can continue into a cylindrical collar 7 having a larger diameter or generally into one or more cylindrical, concentric portions having larger or smaller diameters.
  • the guide surface 5 continues at the front end of the ferrule, for example through a conical surface or bevelling, into a front flat surface 6 that is perpendicular to the axis of the cylindrical surfaces.
  • the guide surface is in the use of the ferrule, when an optical fiber is attached therein, intended to cooperate with another connector having an identical cylindrical guide surface, not shown, and to be centered or aligned in relation thereto by for example mounting an elastic guide sleeve, not shown, on the guide surfaces and then the end surface 8 of the fiber 1 is placed at a corresponding surface in the other connector.
  • the ferrule can be made from for example some curable plastics material and it can, at least in the portion located inside the guide surface 5, be transparent to ultraviolet light.
  • the optical fiber 1 is over a portion 9 at its end rid of its protective polymer coating 10. Also, through all of the ferrule a through-hole or bore is provided extending along the axis of the outer cylindrical surfaces.
  • the through-hole has a front portion 13 having a diameter that somewhat exceeds the diameter of the naked optical fiber 9, e.g. by 10 - 50 %.
  • the through-hole also has a rear portion 15 having a diameter that is larger than that of the front portion 13 and that is also larger than the diameter of the coating 10 of the optical fiber.
  • transverse hole 17 is provided that extends from the guide surface 5 in to the front portion 13 of the axial hole 11.
  • transverse hole 17 In a first embodiment only one such transverse hole is provided that can optionally extend rectilinearly either only in to the axial hole 11, i.e. it can be a blind hole, or through all of the front portion of the ferrule, i.e. it can be a through-hole.
  • the end surface 8 of the optical fiber 1 must be mounted accurately centered in relation to the guide surface 5, i.e. the end surface 8 must have its center point exactly placed at the geometric axis of the guide surface.
  • the device includes a mechanic support part 17 having an inner cylindrical surface that is accurately adapted to the guide surface 5 so that the ferrule 3 can be mounted in the support part in an exact position.
  • a mechanical linear movement device 19 for axial movement is provided to grip, using a gripping surface 21, the optical fiber 1 at the protective coating 10 thereof at a distance of the fiber end 8 and to displace the fiber in a movement in directions parallel to the axis of the ferrule 3.
  • the gripping surface 21 is so located that a fiber 1 held by the gripping surface with its end portion can be moved into the ferrule 3 placed in the support part 17.
  • a detachable fiber holder not shown, can be used in which the fiber is securely held and which also can be securely placed and held by the axial movement device 19.
  • a movement device 23 for radial displacement is provided, including a motor 24 and a gripping surface or contact surface 25 for gripping the fiber at the naked portion 9 thereof through the transverse hole 17 or holes for moving the fiber in directions perpendicular to the axis of the ferrule 3 or in a plane perpendicular to the axis.
  • the motor 24 can be connected to at least one arm 26 which passes through the transverse hole 17 in to the naked optical fiber and which there at its end has the gripping surface or contact surface.
  • the gripping surface 25 is shown in greater detail in Figs. 2 and 3 and it has in the design illustrated there, a concave shape including part of a cylindrical surface, the diameter of which agrees with or is somewhat larger than the diameter of the naked fiber. It can be designed as a subatmospheric or vacuum chuck and then, a channel is provided, not shown, in the arm 26 which mouths in the gripping surface and is connected to a subatmospheric pressure source, not shown.
  • a light injection device 27 can inject light into the optical fiber at a portion extending from the end thereof to propagate along the fiber in the direction towards the end surface 8 and to pass out of the end surface.
  • the light transmitted from the end surface is by a lens system 29 imaged on the active surface of a camera 31 of CCD type.
  • the axial movement device 19, the transverse radial movement device 23 and in particular the motor 23 thereof and the CCD camera 31 are all electrically connected to a control unit 33, designed for example as a microprocessor or computer.
  • the optical fiber By the movement devices 19, 23 and detecting the light emitted from the fiber end the optical fiber can be moved to a position having its end surface 8 located substantially in the same plane as or insignificantly projecting from the front surface of the ferrule and centered in relation to the guide surface 5, as will now be briefly described.
  • a ferrule 3 is mounted in the mechanical support part 17 having its guide surface in contact with and enclosed by the corresponding inner surface of the support part. From an end portion of an optical fiber 1 the protective coating thereof is removed so that a naked portion 9 is formed at the end of the fiber. The fiber 1 is at its remaining coating 10 gripped in a region located not too far away from the naked portion of the gripping surface 21 of the axial movement device 19. It is activated by a signal from the control unit 13 and displaces the end portion of the fiber into the bore 11 of the ferrule 3. Preferably the fiber is moved so that its end surface is located somewhat outside the front surface 6 of the ferrule 3.
  • the end surface of the fiber can be observed in that image or those images that is/are generated on the active surface of the camera 31 by the lens system 29.
  • the lens system for a suitable setting of a lens system, not shown, the lens system for example being the microscope type, of the camera, interference fringes can be observed which can advantageously be utilized.
  • the electrical signals that correspond to the images are transferred to and analyzed by the control unit 33, in particular those portions of the signals which indicate the interference fringes.
  • the control unit provides a signal to the axial movement unit 19 to control the axial displacement and stop it when the end surface 8 of the fiber is located in an intended position.
  • the naked end portion 9 of the fiber extends into the front narrow portion 13 of the bore 11 and is located with some play in relation to the wall of the front portion of the bore.
  • the naked fiber portion is gripped by the gripping surface 25 of the arm 26 of the radial movement device 23 and the motor 24 of this movement device is activated by signals from the control unit for moving the arm and thereby the fiber end laterally.
  • the fiber end is displaced to a position that is centered in relation to the guide surface 5 of the ferrule, in a feedback manner.
  • the signals from the control unit are generated by automatic image processing of the video sig- nals from the camera 31 so that a feedback control is obtained.
  • FIGs. 4a and 4b schematic pictures of the front surface of the ferrule when placing the optical fiber in its position are shown.
  • the ferrule 3 shown in Figs. 4a and 4b has an axial bore 11, 13 that is not concentric with the guide surface 5.
  • the fiber When the fiber is introduced into the ferrule by the axial movement device 19 it obtains the position illustrated in Fig. 4a and is neither centered in the hole 11, 13 or in relation to the guide surface 5, the center of which is shown at 39.
  • the fiber By a lateral displacement obtained by a suitable activation of the motor 24 the fiber can obtain the well centered position as shown in Fig. 4b.
  • Images similar to those of Figs. 4a and 4b are captured by the camera 13 and are evaluated by the control unit 33.
  • an adhesive or curable mass 35 is introduced.
  • the adhesive or the mass can preferably also be introduced before the final positioning of the fiber and surface 8, possibly also before the fiber is introduced in the axial bore 11.
  • the adhesive or mass is cured in a suitable way such as by exposing it to ultraviolet light which is conducted therein through the fiber, from for example the front end surface thereof.
  • the ferrule 3 can in its front portion be made from a material that is transparent to ultraviolet light, this facilitating the introduction of the ultraviolet light to the curable adhesive or mass.
  • the front portion of the ferrule can have a configuration as illustrated by the cross sectional view of Fig. 5.
  • the naked end of the fiber is here illustrated as somewhat projecting beyond the front surface 6 of the ferrule and the adhesive or mass 35 secures the end in a desired centered position.
  • the end surface 8 of the fiber can generally be located in the same plane as the front surface as has been mentioned above, even somewhat retracted in relation to or inside the end surface.
  • the end surface 8 of the fiber can be made to be located in a desired position axially in 5 relation to the front surface 6 of the ferrule, such as substantially in the same plan as it.
  • Such a position in the plane of the front surface allows that polishing the end surface in order to give it an intended shape and to make it be located accurately in the plane of the front surface can be made within a time period that is short compared to the time period which is required when using a conventional, direct mechanical guiding of the optical fiber by the axial bore to a centered posi-
  • the radial movement device 23 includes a plurality, such as three, arms 26' that are arranged in holes 17 in the same plane perpendicular to the axis of the ferrule and that are evenly distributed over the full turn, i.e. in the design shown forming an angle of
  • the arms 26' are here not required to have some gripping surfaces but can have smooth end surfaces 25' for engaging with and displacing an introduced optical fiber.
  • the arms 26' are connected to motors, not shown, for moving them and thereby an introduced optical fiber to a desired transverse position.
  • the device as described above can also be used for positioning a fiber guide or fiber insert in an accurately determined position in a ferrule, compare the published European Patent application 0 301 775.
  • a fiber insert can according to this European patent application comprise a hole fiber or channel fiber, also called fiber capillary, of substantially the same material as that of the optical fiber.
  • the ferrule 3' is used having an axial hole
  • the hole fiber 41 is, when positioned in the ferrule, supported by the front narrow part of a support rod 43 that at its rear end is held by the gripping surface 21 of the axial movement device 19.
  • the hole fiber 41 has such a length that it extends, after it has been placed in a desired axial position by the axial movement device with its
  • the support rod 43 is elastic and allows transverse displacement of the hole fiber using the radial movement device, not visible in Fig. 7.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

L'invention concerne une virole (3) pour fibre optique qui comporte un canal axial (11) pour fibre optique (1). Le canal a un diamètre supérieur à celui de la fibre optique. Un trou (17) se prolonge dans la virole à l'intérieur du canal. Un bras (26) permet de positionner dans une position latérale la fibre optique à l'intérieur du canal, et de la maintenir en position par exemple au moyen d'un adhésif (35). On peut aussi utiliser la virole de la même manière pour recevoir une fibre creuse agissant dans le trou comme un guide précis et comme un manchon de guidage interne pour la fibre optique. Il n'est pas nécessaire de fabriquer le canal axial avec une précision élevée, ce qui permet de réduire le coût de la fibre et de la virole montée. Enfin, la surface terminale (8) de la fibre peut être placée correctement de façon assez simple au plan de la surface frontale (6) de la virole, ce qui permet de réduire le temps requis par le polissage de la surface terminale de la fibre et de la surface frontale de la virole.
PCT/SE2002/001355 2002-07-04 2002-07-04 Virole pour fibre optique WO2004017115A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002324389A AU2002324389A1 (en) 2002-07-04 2002-07-04 Fiberoptical ferrule
PCT/SE2002/001355 WO2004017115A1 (fr) 2002-07-04 2002-07-04 Virole pour fibre optique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2002/001355 WO2004017115A1 (fr) 2002-07-04 2002-07-04 Virole pour fibre optique

Publications (1)

Publication Number Publication Date
WO2004017115A1 true WO2004017115A1 (fr) 2004-02-26

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Application Number Title Priority Date Filing Date
PCT/SE2002/001355 WO2004017115A1 (fr) 2002-07-04 2002-07-04 Virole pour fibre optique

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AU (1) AU2002324389A1 (fr)
WO (1) WO2004017115A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012054068A3 (fr) * 2010-07-30 2012-07-19 Tyco Electronics Corporation Procédé de préparation d'un ensemble ferrule
WO2015107435A1 (fr) * 2014-01-14 2015-07-23 Tyco Electronics (Shanghai) Co. Ltd. Système et procédé d'alignement pour l'étalonnage de la position d'une fibre optique dans le perçage d'une ferrule
WO2016162544A1 (fr) * 2015-04-10 2016-10-13 Ge Healthcare Bio-Sciences Ab Dispositif pour porter un guide de lumière, procédé de fabrication d'un tel dispositif et cellule d'écoulement optique incorporant un tel dispositif
EP2992373A4 (fr) * 2013-05-03 2017-07-12 Molex, LLC Ensemble de fibres optiques
US20220075125A1 (en) * 2012-02-20 2022-03-10 Commscope Technologies Llc Fiber optic connector, fiber optic connector and cable assembly, and methods for manufacturing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938895A (en) * 1974-08-19 1976-02-17 Gte Laboratories Incorporated Method for positioning an optical fiber
EP0301775A2 (fr) * 1987-07-31 1989-02-01 THOMAS & BETTS CORPORATION Méthode et appareil pour terminer une fibre optique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938895A (en) * 1974-08-19 1976-02-17 Gte Laboratories Incorporated Method for positioning an optical fiber
EP0301775A2 (fr) * 1987-07-31 1989-02-01 THOMAS & BETTS CORPORATION Méthode et appareil pour terminer une fibre optique

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012054068A3 (fr) * 2010-07-30 2012-07-19 Tyco Electronics Corporation Procédé de préparation d'un ensemble ferrule
US8573856B2 (en) 2010-07-30 2013-11-05 Tyco Electronics Corporation Method for preparing a ferrule assembly
US8961036B2 (en) 2010-07-30 2015-02-24 Tyco Electronics Corporation Ferrule assembly
US20220075125A1 (en) * 2012-02-20 2022-03-10 Commscope Technologies Llc Fiber optic connector, fiber optic connector and cable assembly, and methods for manufacturing
EP2992373A4 (fr) * 2013-05-03 2017-07-12 Molex, LLC Ensemble de fibres optiques
US10007062B2 (en) 2013-05-03 2018-06-26 Molex, Llc Optical fiber assembly
WO2015107435A1 (fr) * 2014-01-14 2015-07-23 Tyco Electronics (Shanghai) Co. Ltd. Système et procédé d'alignement pour l'étalonnage de la position d'une fibre optique dans le perçage d'une ferrule
US20160334583A1 (en) * 2014-01-14 2016-11-17 Tyco Electronics (Shanghai) Co. Ltd. Alignment system and method for calibrating position of optical fiber bore ferrule
US10215927B2 (en) 2014-01-14 2019-02-26 Commscope Telecommunications (Shanghai) Co. Ltd. Alignment system and method for calibrating position of optical fiber bore ferrule
WO2016162544A1 (fr) * 2015-04-10 2016-10-13 Ge Healthcare Bio-Sciences Ab Dispositif pour porter un guide de lumière, procédé de fabrication d'un tel dispositif et cellule d'écoulement optique incorporant un tel dispositif
US10261008B2 (en) 2015-04-10 2019-04-16 Ge Healthcare Bio-Sciences Ab Device for holding a light guide, method for manufacturing such a device and an optical flow cell incorporating such a device
EP3281050B1 (fr) * 2015-04-10 2021-12-01 Cytiva Sweden AB Dispositif pour porter un guide de lumière, procédé de fabrication d'un tel dispositif et cellule d'écoulement optique incorporant un tel dispositif

Also Published As

Publication number Publication date
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