WO2000019258A1 - Procede d'installation d'un cable a fibres optiques dans un conduit - Google Patents

Procede d'installation d'un cable a fibres optiques dans un conduit Download PDF

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Publication number
WO2000019258A1
WO2000019258A1 PCT/GB1999/002140 GB9902140W WO0019258A1 WO 2000019258 A1 WO2000019258 A1 WO 2000019258A1 GB 9902140 W GB9902140 W GB 9902140W WO 0019258 A1 WO0019258 A1 WO 0019258A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
optical fibre
unit
fibre unit
lengths
Prior art date
Application number
PCT/GB1999/002140
Other languages
English (en)
Inventor
George Henry Platt Brown
Original Assignee
Mainetti Technology 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 Mainetti Technology Limited filed Critical Mainetti Technology Limited
Priority to AU46357/99A priority Critical patent/AU4635799A/en
Publication of WO2000019258A1 publication Critical patent/WO2000019258A1/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
    • G02B6/46—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
    • G02B6/502—Installation methods in fluid conducts, e.g. pipelines
    • 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

Definitions

  • optical fibre unit encompasses a unit comprising one or more, or a bundle, of reinforced or unreinforced optical fibres, or a bundle of optical fibres.
  • Optical fibres are used in an increasing number of signal transmission applications to replace cables containing electrical conductors, since an optical fibre unit has a much greater signal processing capacity per unit of volume than an electrical cable.
  • Optical fibre units are often installed in underground ducts, which may be existing ducts previously used to accommodate electrical cables .
  • One known method of installing an optical fibre unit in an underground duct is to blow a length of the fibre into the duct by means of a blowing head, the construction and operation of which will be known to persons skilled in the art.
  • the maximum length of fibre unit which can be installed in a single blowing operation is determined by a number of factors, such as the coefficient of friction between the fibre unit and the duct in which it is to be installed, the internal diameter of the duct, and the air pressure.
  • one prior art method is to blow a length of optical fibre unit into a length of duct not exceeding the maximum blowable length, and then repeat the process with successive lengths of duct.
  • the cost of skilled personnel to carry out the above blowing operations represents a significant proportion of the cost of installing optical fibre units.
  • the installation cost often represents a significant proportion of the cost of the fibre unit itself. It is therefore highly desirable to maximise the rate at which skilled personnel can install an optical fibre unit at a single location.
  • An optical fibre unit 1 is to be installed in first length 2 and second length 3 of duct, the two lengths of duct being accessible via a manhole 4 between the lengths of duct.
  • the optical fibre unit 1 is coiled in a fibre optic pan 5, the construction of which will be known to persons skilled in the art.
  • An example of such a fibre pan is described in WO88/10230 in the name of British Telecommunications PLC.
  • One end 6 of the optical fibre unit 1 is inserted into a blowing head 7 located in the manhole 4, and the fibre unit 1 is then blown into the first length 2 of duct until the end 6 of the unit 1 emerges at the opposite end of the length 2 of duct, for example in a further manhole 8.
  • the fibre pan 5 is then located at the opposite side of manhole 4, as shown in Figure lb, and the pan 5 is inverted to allow access to the opposite end 9 of the fibre unit 1. Great care needs to be taken when inverting the pan to ensure that the fibre unit is not damaged and does not become tangled.
  • the fibre unit 1 is then blown into the second length of duct 3 until the end 9 emerges from the opposite end of the second length 3 of duct .
  • the above method increases the length of optical fibre unit 1 that can be installed in a single location such as a manhole 4 compared with the prior art method discussed above.
  • the time taken to install the fibre unit into the two lengths of duct means that the installation costs still represent a significant proportion of the overall cost of the optical fibre unit .
  • Preferred embodiments of the present invention seek to overcome this disadvantage of the prior art.
  • preferred embodiments of the present invention seek to increase the rate at which optical fibre unit can be installed at a single location.
  • a method of installing an optical fibre unit in a duct comprising first and second lengths of duct comprising:
  • optical fibre unit By arranging the optical fibre unit in first and second lengths in a receptacle, this gives the advantage of providing access to both ends of the fibre unit. This in turn enables simultaneous, or partially simultaneous, blowing operations into two lengths of duct to be carried out at a single location. This significantly increases, potentially doubling, the rate at which optical fibre unit can be installed in a duct in a single blowing operation, thus significantly reducing installation cost.
  • said first and second lengths of said unit are coiled in said receptacle.
  • the method preferably further comprises the step of securing a point of said fibre unit intermediate said ends thereof to said receptacle .
  • the method further comprises the step of slowing the rate of blowing of the unit into said first and second lengths of duct when the unit is almost fully installed.
  • Figures la and lb are a schematic representation of a prior art method of blowing an optical fibre unit into two lengths of duct ;
  • Figure 2 is a schematic representation of two lengths of duct into which an optical fibre unit is to be installed by a method embodying the present invention
  • Figure 3 is a schematic illustration of a winding apparatus for transferring optical fibre unit between drums prior to installation by the method of the present invention
  • Figure 4 is a perspective view of a receptacle for receiving coiled lengths of optical fibre unit for use in the method of the present invention
  • Figure 5 is a schematic plan view of the coiled fibre unit in the receptacle of Figure 4.
  • a route in which a fibre optic unit 101 is to be installed consists of a first length of duct 102 leading to an exchange building or optical node 120, and a second length of duct 103 leading to a customer's premises 121.
  • the first length 102 and second length 103 of duct are separated by a manhole 104.
  • 950 metres of optical fibre unit 1 is to be installed in the first length 102
  • 1070 metres of the unit 1 is to be installed in the second length 103.
  • the optical fibre unit 101 is initially supplied on a supply drum 122 on which 5 kilometres of optical fibre unit 1 is wound. 950 metres of the unit 101 is initially unwound from supply drum 122 onto a further drum 123 by means of a fibre winder 124.
  • an intermediate point 125 on the fibre 101 which is intended to be finally located in the vicinity of manhole 104, is secured to the base of a fibre receptacle 126 by means of an adhesive tape 127.
  • a pair of fibre coilers 128 then coil 1070 metres of fibre unit 1 from drum 122 and 950 metres of fibre unit 101 from drum 123 into the receptacle 126 to form a pair of adjacent fibre coils 129.
  • the coilers 128 are then removed, and foam inserts (not shown) placed over the fibre coils 129 to hold the coils 129 in place, and the receptacle 126 then covered to enable it to be transported.
  • the receptacle 126 containing the fibre unit 101 is arranged adjacent manhole 104, together with two conventional fibre blowing heads (not shown) the construction of which will be well known to persons skilled in the art.
  • the free ends of the fibre coils 129 are then simultaneously blown into the first length 102 and second length 103 of duct, and the blowing rate is reduced towards the end of the blowing operation to minimise damage to the fibre unit 101 by over- tensioning of the unit 1.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

L'invention concerne un procédé d'installation d'un câble à fibres optiques dans un conduit comprenant un premier tronçon (102) et un second tronçon (103). Le procédé consiste à disposer le câble à fibres optiques, contenu dans un logement, dans le premier tronçon et le second tronçon et à placer le logement au niveau d'un point d'accès semblable à un trou d'homme (104) entre le premier tronçon (102) et le second tronçon (103) du conduit. Une première extrémité du câble à fibres optiques est introduite par soufflage dans le premier tronçon (102) du conduit à partir d'une extrémité de ce dernier au niveau du point d'accès (104) dans une première phase de soufflage. Une seconde extrémité du câble à fibres optiques est ensuite introduite par soufflage dans le second tronçon (103) du conduit à partir d'une extrémitée ce dernier au niveau du point d'accès (104) dans la seconde phase de soufflage. Au moins une partie de la première et de la seconde phases de soufflage est réalisée simultanément.
PCT/GB1999/002140 1998-09-30 1999-07-05 Procede d'installation d'un cable a fibres optiques dans un conduit WO2000019258A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46357/99A AU4635799A (en) 1998-09-30 1999-07-05 Method of installing optical fibre cable in a duct

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9821092.5 1998-09-30
GBGB9821092.5A GB9821092D0 (en) 1998-09-30 1998-09-30 Method of installing optical fibre unit in a duct

Publications (1)

Publication Number Publication Date
WO2000019258A1 true WO2000019258A1 (fr) 2000-04-06

Family

ID=10839602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002140 WO2000019258A1 (fr) 1998-09-30 1999-07-05 Procede d'installation d'un cable a fibres optiques dans un conduit

Country Status (3)

Country Link
AU (1) AU4635799A (fr)
GB (1) GB9821092D0 (fr)
WO (1) WO2000019258A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003040763A2 (fr) * 2001-11-09 2003-05-15 Ccs Technology, Inc. Installation de systemes de cable optique
WO2004074900A1 (fr) * 2003-02-20 2004-09-02 Emtelle Uk Limited Soufflage de cables a fibres optiques dans des conduits

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010230A1 (fr) * 1987-06-22 1988-12-29 British Telecommunications Public Limited Company Enroulement de fibres
FR2653946A1 (fr) * 1989-10-31 1991-05-03 Dehe Entreprises A Procede de deroulage et de mise en place d'un cable a fibres optiques et installation pour la mise en óoeuvre de ce procede.
WO1997003376A1 (fr) * 1995-07-12 1997-01-30 Mainetti Technology Limited Procede d'installation d'une unite de fibre optique dans un tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010230A1 (fr) * 1987-06-22 1988-12-29 British Telecommunications Public Limited Company Enroulement de fibres
FR2653946A1 (fr) * 1989-10-31 1991-05-03 Dehe Entreprises A Procede de deroulage et de mise en place d'un cable a fibres optiques et installation pour la mise en óoeuvre de ce procede.
WO1997003376A1 (fr) * 1995-07-12 1997-01-30 Mainetti Technology Limited Procede d'installation d'une unite de fibre optique dans un tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003040763A2 (fr) * 2001-11-09 2003-05-15 Ccs Technology, Inc. Installation de systemes de cable optique
WO2003040763A3 (fr) * 2001-11-09 2003-10-09 Ccs Technology Inc Installation de systemes de cable optique
WO2004074900A1 (fr) * 2003-02-20 2004-09-02 Emtelle Uk Limited Soufflage de cables a fibres optiques dans des conduits

Also Published As

Publication number Publication date
GB9821092D0 (en) 1998-11-18
AU4635799A (en) 2000-04-17

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