WO2006067409A1 - Blown optical fibre multi-tube terminal connector - Google Patents

Blown optical fibre multi-tube terminal connector Download PDF

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Publication number
WO2006067409A1
WO2006067409A1 PCT/GB2005/004929 GB2005004929W WO2006067409A1 WO 2006067409 A1 WO2006067409 A1 WO 2006067409A1 GB 2005004929 W GB2005004929 W GB 2005004929W WO 2006067409 A1 WO2006067409 A1 WO 2006067409A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fibre
connector
tubes
tube terminal
terminal connector
Prior art date
Application number
PCT/GB2005/004929
Other languages
French (fr)
Inventor
Marek Hugh Mozolowski
Rosamund Carol Neat
John Kerry
Robert William Prentice
Scott James Harvey
Original Assignee
Brand-Rex Limited
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 Brand-Rex Limited filed Critical Brand-Rex Limited
Publication of WO2006067409A1 publication Critical patent/WO2006067409A1/en

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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
    • G02B6/52—Underground or underwater installation; Installation through tubing, conduits or ducts using fluid, e.g. air
    • 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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
    • 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
    • G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
    • G02B6/3826—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres characterised by form or shape
    • G02B6/3829—Bent or angled connectors
    • 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
    • G02B6/3874—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using tubes, sleeves to align ferrules
    • G02B6/3878—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using tubes, sleeves to align ferrules comprising a plurality of ferrules, branching and break-out means
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4471—Terminating devices ; Cable clamps
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4471—Terminating devices ; Cable clamps
    • G02B6/4478—Bending relief means

Definitions

  • This invention relates to connectors , and specifically to terminal connectors for tubes for carrying optical fibre .
  • Fibre optic cables are used in the communications industry for transmitting information by light through the individual fibres .
  • the fibres or cabled fibres are blown along lengths of tube .
  • Bundles of blown fibre tubes can be arranged in a cable or outer duct . This technique is described in EP0408266A2 (BICC & Corning) and EP0345043 (British Telecommunications) .
  • Tubes to carry optical fibres normally need to be connected, e . g . to further lengths of fibre optic tubes, or to a terminal device .
  • connection of two lengths of tubes in a cable via an inline joint is currently achieved by individual inline connectors of a type made by John Guest Connectors Ltd as described in WO03/023466A2 (Pirelli) .
  • the cable has a protective sheath which is stripped to expose the bare tubes, and using individual tube connectors to connect individual tubes to each other in a suitable housing .
  • Such j oints can be permanent or re-enterable .
  • a permanent joint involves placing a permanent closure around the j oint , sealing the j oint to the cable and thereby forming a watertight seal for the cable interstices .
  • a re-enterable j oint may be used where glands seal the cable to the j oint and the housing has a re-usable seal .
  • the sealing of the cable to the j oint can be via a mechanical means or simple heat shrink. Whichever method is used it is sometimes important to seal the j oints against the ingress of moisture . Furthermore when using a blown fibre method it is necessary to seal against high installation blowing pressures (up to lobar) and burst pressures (typically installation pressure multiplied by 2.5 , i . e . 25bar) .
  • the present invention provides a blown optical fibre multi-tube terminal connector comprising at least a first part arranged to receive and clamp onto a cable of tubes in an initially closely packed state, and a second part arranged to receive tubes in a splayed state wherein the tubes terminate in the second part at a spaced relationship where the spacing is greater than the spacing at the initially closely packed state, the arrangement being such that provision is made so as to connect the connector to a further element .
  • Figure 1 is a perspective view of a pair of fully assembled blown optical fibre multi-tube connectors .
  • Figure 2 is a partially expanded perspective view of a pair of blown optical fibre multi-tube connectors .
  • Figure 3 is a perspective view of all components of a pair of blown optical fibre multi-tube connectors .
  • Figure 4 and Figure 4a are a longitudinal cross section of a pair of blown optical fibre multi-tube connectors along the line A-A of Figure 1 , including the path of a single tube through the connector .
  • Figure 4b is a formulaic representation of the displacement of the tube from its original position and for the subsequent distance between the beginning and end of the bend in the connector .
  • Figure 5 is a longitudinal cross section of a connecting part formed into an ' elbow ' configuration.
  • Figure 1 shows a pair of connectors , comprising a first part arranged to receive and clamp onto a cable of tubes , a second part to receive splayed tubes , and a connecting part and connector locking ring to allow for connection to a further element .
  • Figure 2 shows a length of cable 1 terminating in connector 2 , and a second length of cable I 1 terminating in connector 2 ' .
  • Connecting part 3 links the two connectors thereby j oining the cables .
  • Figure 3 illustrates the separated components of the connector, and the connecting part .
  • the first part comprises gland slip ring 4 and gland body 5
  • the second part comprises alignment device 6 , sealing means
  • the connecting part 3 includes sealing means 9 and sealing retaining plate 10.
  • Connector locking ring 11 maintains the connection of the connector to a further element .
  • the gland body 5 is clamped onto a cable of tubes by means of gland slip ring 4.
  • the separated tubes then pass through the alignment device 6.
  • the separated tubes then pass through channels in the tube seating body 8.
  • the channels of the tube seating body 8 decrease in diameter at a point such that a shoulder is formed on which the terminal ends of the tubes sit .
  • the tube seating body 8 forms a multiple male plug interface with the connecting part 3. This arrangement ensures that each tube is connected sealingly to the next inline tube via tube seating body 8 and connecting part 3. Sealing means 7 is provided between the alignment device 6 and tube seating body 8 , and sealing means 9 and seal retaining plate 10 are provided between the tube seating body 8 and the connecting part 3. Sealing means 7 and 9 could comprise, for example, multiple 1 O 1 rings .
  • the connecting part 3 links one connector to another, or to a device, and connector locking ring 11 maintains the connection.
  • Figure 4 shows the route of a single tube through the connector.
  • the tube forms an 1 S ' bend as it passes through the gland body 5 and alignment device 6. All tubes except the central tube assume an ⁇ S ' bend, thus ensuring that the end of a tube is parallel to the same tube when in the bundle clamped by cable gripping gland 4.
  • Figure 4b provides a formulaic representation of shape required to be formed by the tube to allow an optical fibre to be installed by the blown fibre method.
  • the formula provides the displacement of the tube from its original position, and the subsequent distance between the beginning and end of the bend in the connector, using the centre line of the tube as a reference point .
  • the connecting part 3 may be formed in a particular configuration to provide a certain function .
  • Figure 5 shows the connecting part formed into an elbow . This configuration can be used when it is necessary to change the direction of the optical fibre cables , for example, to turn a corner .
  • a minimum bend radius must be maintained for multi-tube cables on changing direction.
  • the minimum bend radius for multi-tube cables is approximately ten times the diameter of the cable , e . g . a multi-tube cable comprising seven 5mm tubes and having an overall diameter of 20mm should not be subj ected to a bend radius of less than 200mm.
  • the minimum bend radius is reduced to 50mm.
  • the elbow contains pre-configured routes for the tubes at the correct radii , and provides a patch tube interface which allows a fibre optic multi-tube gland and multi-tube cable to be connected to either end. Therefore the space required to achieve the 90 ° bend is reduced compared with bending the cable as a whole .
  • the connecting part 3 and the tube seating body 8 may also be formed so as to provide a keyway.

Abstract

A multi-tube terminal connector (2) for connecting tubes into which optical fibres are to be installed by the blown fibre technique, comprising a first part arranged to receive and clamp onto a cable (1) of tubes in an initially closely packed state, and a second part arranged to receive tubes in splayed state, wherein the tubes terminate in the second part at a spaced relationship, the spacing being greater than the spacing at the initially closely packed state, and the arrangement being such that provision (3) is made so as to connect the connector to a further element.

Description

BLOWN OPTICAL FIBRE MULTI-TUBE TERMINAL CONNECTOR
This invention relates to connectors , and specifically to terminal connectors for tubes for carrying optical fibre .
Fibre optic cables are used in the communications industry for transmitting information by light through the individual fibres . During installation, in a method known as the blown fibre method, the fibres or cabled fibres are blown along lengths of tube . Bundles of blown fibre tubes can be arranged in a cable or outer duct . This technique is described in EP0408266A2 (BICC & Corning) and EP0345043 (British Telecommunications) .
Tubes to carry optical fibres normally need to be connected, e . g . to further lengths of fibre optic tubes, or to a terminal device .
The connection of two lengths of tubes in a cable via an inline joint is currently achieved by individual inline connectors of a type made by John Guest Connectors Ltd as described in WO03/023466A2 (Pirelli) . The cable has a protective sheath which is stripped to expose the bare tubes, and using individual tube connectors to connect individual tubes to each other in a suitable housing . Such j oints can be permanent or re-enterable . A permanent joint involves placing a permanent closure around the j oint , sealing the j oint to the cable and thereby forming a watertight seal for the cable interstices . A re-enterable j oint may be used where glands seal the cable to the j oint and the housing has a re-usable seal . The sealing of the cable to the j oint can be via a mechanical means or simple heat shrink. Whichever method is used it is sometimes important to seal the j oints against the ingress of moisture . Furthermore when using a blown fibre method it is necessary to seal against high installation blowing pressures (up to lobar) and burst pressures (typically installation pressure multiplied by 2.5 , i . e . 25bar) .
The current method of joining is time consuming and tedious due to the requirement to join each tube individually.
Accordingly the present invention provides a blown optical fibre multi-tube terminal connector comprising at least a first part arranged to receive and clamp onto a cable of tubes in an initially closely packed state, and a second part arranged to receive tubes in a splayed state wherein the tubes terminate in the second part at a spaced relationship where the spacing is greater than the spacing at the initially closely packed state, the arrangement being such that provision is made so as to connect the connector to a further element .
Reference will now be made to embodiments of the invention by way of example to the accompanying drawings .
Figure 1 is a perspective view of a pair of fully assembled blown optical fibre multi-tube connectors .
Figure 2 is a partially expanded perspective view of a pair of blown optical fibre multi-tube connectors .
Figure 3 is a perspective view of all components of a pair of blown optical fibre multi-tube connectors .
Figure 4 and Figure 4a are a longitudinal cross section of a pair of blown optical fibre multi-tube connectors along the line A-A of Figure 1 , including the path of a single tube through the connector .
Figure 4b is a formulaic representation of the displacement of the tube from its original position and for the subsequent distance between the beginning and end of the bend in the connector .
Figure 5 is a longitudinal cross section of a connecting part formed into an ' elbow ' configuration.
Figure 1 shows a pair of connectors , comprising a first part arranged to receive and clamp onto a cable of tubes , a second part to receive splayed tubes , and a connecting part and connector locking ring to allow for connection to a further element .
Figure 2 shows a length of cable 1 terminating in connector 2 , and a second length of cable I 1 terminating in connector 2 ' . Connecting part 3 links the two connectors thereby j oining the cables . Connecting ring 11
(covering connecting part 3) maintains the connection.
Figure 3 illustrates the separated components of the connector, and the connecting part . The first part comprises gland slip ring 4 and gland body 5 , and the second part comprises alignment device 6 , sealing means
7 , and tube seating body 8. The connecting part 3 includes sealing means 9 and sealing retaining plate 10. Connector locking ring 11 maintains the connection of the connector to a further element .
The gland body 5 is clamped onto a cable of tubes by means of gland slip ring 4. The separated tubes then pass through the alignment device 6. The separated tubes then pass through channels in the tube seating body 8. The channels of the tube seating body 8 decrease in diameter at a point such that a shoulder is formed on which the terminal ends of the tubes sit .
The tube seating body 8 forms a multiple male plug interface with the connecting part 3. This arrangement ensures that each tube is connected sealingly to the next inline tube via tube seating body 8 and connecting part 3. Sealing means 7 is provided between the alignment device 6 and tube seating body 8 , and sealing means 9 and seal retaining plate 10 are provided between the tube seating body 8 and the connecting part 3. Sealing means 7 and 9 could comprise, for example, multiple 1O 1 rings . The connecting part 3 links one connector to another, or to a device, and connector locking ring 11 maintains the connection.
Figure 4 shows the route of a single tube through the connector. As illustrated in Figure 4 and in detail in Figure 4a, the tube forms an 1 S ' bend as it passes through the gland body 5 and alignment device 6. All tubes except the central tube assume an λ S ' bend, thus ensuring that the end of a tube is parallel to the same tube when in the bundle clamped by cable gripping gland 4.
Figure 4b provides a formulaic representation of shape required to be formed by the tube to allow an optical fibre to be installed by the blown fibre method. The formula provides the displacement of the tube from its original position, and the subsequent distance between the beginning and end of the bend in the connector, using the centre line of the tube as a reference point .
The connecting part 3 may be formed in a particular configuration to provide a certain function . Figure 5 shows the connecting part formed into an elbow . This configuration can be used when it is necessary to change the direction of the optical fibre cables , for example, to turn a corner . To prevent tube kink or tube collapse, a minimum bend radius must be maintained for multi-tube cables on changing direction. The minimum bend radius for multi-tube cables is approximately ten times the diameter of the cable , e . g . a multi-tube cable comprising seven 5mm tubes and having an overall diameter of 20mm should not be subj ected to a bend radius of less than 200mm. However, by stripping the sheath from the cable and essentially treating each single 5mm tube as a separate entity, the minimum bend radius is reduced to 50mm. The elbow contains pre-configured routes for the tubes at the correct radii , and provides a patch tube interface which allows a fibre optic multi-tube gland and multi-tube cable to be connected to either end. Therefore the space required to achieve the 90 ° bend is reduced compared with bending the cable as a whole .
It may be possible for substitution of the connecting part 3 to occur after installation of the tubes and prior to blown installation of the fibre .
The connecting part 3 and the tube seating body 8 may also be formed so as to provide a keyway.
It is known from WO03/023466A2 (Pirelli) to have a carbon loaded radially inner surface to blown fibre tubes . This is provided to dissipate static charges . However, when such tubes are so provided in cables to be connected as in the present invention, the inner conducting surface of adj acent connected lengths of tube can be used to convey electrical signals from one tube length to another or from one tube length to a terminal device . The invention thus enables multiple conductor provision. For such an arrangement the tube seating body 8 and connecting part 3 require mutually conductive surfaces which can be provided on the shoulders of tube seating body 8 and connecting part 3 so that a conductive path is maintained through the connector . This could be achieved, for example , by introducing a carbon lining during manufacturing, or by application of a conductive paste to the connector components during assembly.

Claims

Claims
1. A blown optical fibre multi-tube terminal connector comprising at least a first part arranged to receive and clamp onto a cable of tubes in an initially closely packed state, and a second part arranged to receive tubes in splayed state wherein the tubes terminate in the second part at a spaced relationship where the spacing is greater than the spacing at the initially closely packed state, the arrangement being such that provision is made so as to connect the connector to a further element .
2. A blown optical fibre multi-tube terminal connector as claimed in claim 1 wherein the provision so as to connect the connector to a further element is made by a connecting part with axially aligned sealing provided between the second part and connecting part and between the connecting part and the further element, the arrangement being such that provision is made so as to maintain said connector, connecting part, and further element in position relative to one another.
3. A blown optical fibre multi-tube terminal connector as claimed in claim 2 wherein the provision so as to maintain the connector, connecting part and further element in position relative to one another is made by a connector locking ring.
4. A blown optical fibre multi-tube terminal connector as claimed in claims 2 or 3 wherein a pair of connectors are linked by a connecting part .
5. A blown optical fibre multi-tube terminal connector as claimed in claim 4 wherein the connecting part is shaped such that the tubes in the initially closely packed state received by one first part are axially misaligned, preferably at right angles, to the corresponding tubes in the other first part .
6. A blown optical fibre multi-tube terminal connector as claimed in any of the preceding claims wherein the tubes form an 1 S ' bend, the shape of the bend being determined by the formulae : f = 2 (εd - (εd cosα) ) + c where c = 0 for f ≤ εd and g = 2εd sinα R = εd
Where d = tube diameter and ε = optimum blowing parameter .
7. A blown optical fibre multi-tube terminal connector as claimed in any one of the preceding claims wherein the tubes terminate in a flat plane .
8. A blown optical fibre multi-tube terminal connector as claimed in any one of claims 1 to 6 wherein the centres of the tubes terminate in a curved plane .
9. A blown optical fibre multi-tube terminal connector as claimed in any one of the preceding claims wherein the ends of the tubes are spaced radially from an axial centre of the connector .
10. A blown optical fibre multi-tube terminal connector as claimed in any one of claims 2 to 9 wherein the connecting part and the second part are arranged so as to provide a keyway.
11. A blown optical fibre multi-tube terminal connector as claimed in any one of the preceding claims wherein a conductive path is maintained through the connector.
12. A blown optical fibre multi-tube terminal connector substantially as herein described, with reference to the accompanying drawings .
PCT/GB2005/004929 2004-12-22 2005-12-20 Blown optical fibre multi-tube terminal connector WO2006067409A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0428047.5 2004-12-22
GB0428047A GB2421640B8 (en) 2004-12-22 2004-12-22 Blown optical fibre multi tube terminal connector

Publications (1)

Publication Number Publication Date
WO2006067409A1 true WO2006067409A1 (en) 2006-06-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/004929 WO2006067409A1 (en) 2004-12-22 2005-12-20 Blown optical fibre multi-tube terminal connector

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WO (1) WO2006067409A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008037126B3 (en) * 2008-08-08 2010-03-11 Adc Gmbh Apparatus and method for sealing tubes of a blown fiber cable as it enters a sleeve

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047797A (en) * 1976-06-09 1977-09-13 International Telephone And Telegraph Corporation Fiber optic connector
GB1526682A (en) * 1977-01-25 1978-09-27 Itt Single optical fibre connector
JPS5562417A (en) * 1978-11-06 1980-05-10 Fujitsu Ltd Single core aggregate type optical fiber connector
EP0147231A2 (en) * 1983-12-27 1985-07-03 E.I. Du Pont De Nemours And Company Terminal device for optical fibers
GB2239104A (en) * 1989-11-28 1991-06-19 Kel Kk Multi-way electro-optic connectors
US5781678A (en) * 1995-01-25 1998-07-14 Sumitomo Electric Industries, Ltd. Optical fiber path joint member and method of blowing optical fiber
JP2000340306A (en) * 1999-05-26 2000-12-08 Sharp Corp Electronic apparatus
WO2004061509A1 (en) * 2002-12-30 2004-07-22 Corning Cable Systems Flexible, multi-fiber optic jumper

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Publication number Priority date Publication date Assignee Title
GB1219766A (en) * 1967-04-13 1971-01-20 Self Changing Gears Ltd Improvements in or relating to the connection of cabled tubes
GB8815741D0 (en) * 1988-07-01 1988-08-10 Bicc Plc Connecting device
GB2408393B (en) * 2002-01-31 2005-09-07 Uponor Innovation Ab Microduct bundle.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047797A (en) * 1976-06-09 1977-09-13 International Telephone And Telegraph Corporation Fiber optic connector
GB1526682A (en) * 1977-01-25 1978-09-27 Itt Single optical fibre connector
JPS5562417A (en) * 1978-11-06 1980-05-10 Fujitsu Ltd Single core aggregate type optical fiber connector
EP0147231A2 (en) * 1983-12-27 1985-07-03 E.I. Du Pont De Nemours And Company Terminal device for optical fibers
GB2239104A (en) * 1989-11-28 1991-06-19 Kel Kk Multi-way electro-optic connectors
US5781678A (en) * 1995-01-25 1998-07-14 Sumitomo Electric Industries, Ltd. Optical fiber path joint member and method of blowing optical fiber
JP2000340306A (en) * 1999-05-26 2000-12-08 Sharp Corp Electronic apparatus
WO2004061509A1 (en) * 2002-12-30 2004-07-22 Corning Cable Systems Flexible, multi-fiber optic jumper

Non-Patent Citations (2)

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Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 103 (P - 020) 23 July 1980 (1980-07-23) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15 6 April 2001 (2001-04-06) *

Also Published As

Publication number Publication date
GB2421640A (en) 2006-06-28
GB2421640A8 (en) 2007-11-20
GB2421640B8 (en) 2007-11-20
GB0428047D0 (en) 2005-01-26
GB2421640B (en) 2007-10-31

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