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France Telecom Etablissement Autonome De Droit Public

France Telecom

Societe Industrielle De Liaisons Electriques Silec

Acome Societe Cooperative De Travailleurs

Etac Francais (Centre National D'etude Des Telecommunications-Cnet)

Georges E Le Noane

Andre M Mathern

Gabrielle Morizur

Isabelle Hardy

Daniel Boscher

Philippe Grosso

Rene Le Marer

Gabrielle Perrin

Christian Lagreve

Rene Lemarer

Daniel Filliatre

Patrick Jamet

Dominique Brault

Philippe Trombert

Philippe Cheron

Dominique Pavy

Bernard G Nonclercq

The invention concerns an optical cable with continuous accessibility, comprising a closed protective sheath surrounding a cavity having in cross section two substantially perpendicular axes intersecting at the center of the cavity, and at least two optical fibers optionally organized in at least two modules and arranged such that they occupy the greater part of the cavity in the direction of the long axis but that they allow a clearance in the cavity in the direction of the shorter axis of the cavity.

Continuously accessible optical cable

The invention relates to apparatus for identifying and splicing at least one multicore optical fiber and including both a system for displaying each multicore fiber and a fiber splicing system. According to the invention at least one ring for surrounding each multicore fiber to be spliced has an outside envelope that is homothetic (geometrically similar) in shape to the outer envelope of each multicore optical fiber, with the outer outside envelope of each ring being designed to be marked as a function of analysis of the image of each multicore fiber as obtained by means of the display system.

Apparatus and a method for identifying and splicing multicore fibers

Small, high precision, multicore optical guides and process for the production of said guides. Such a guide includes elementary guides (G1 to G4) and a matrix (M) in which they are located. These elementary guides are very accurately positioned with respect to one another in the matrix and with respect to the external contours (5) thereof and have high precision geometrical characteristics. According to the process, manufacturing and machining of the blanks so as to obtain, after assembly, the chosen geometrical model for the multicore guide. They are assembled in accordance with this model, welded together by means of a bait and the assembly is drawn.

Small, high precision, multicore optical guides and process for the

According to the invention, a hollow silica bar (2) is produced with a thick wall and high geometrical precision, the bar is then cleaned and an oven (24) is used able to heat the silica to its melting temperature and with respect to which the bar is moved so as to embody an external thermic glazing of the bar, an internal vapor phase depositing a vitreous coating in this bar by making circulate inside it a mixture of suitable gaseous constituents, this coating being intended for the subsequent formation of the core of the optical fibers, and an area contraction of the bar, the various temperatures of the bar required to embody these operations being obtained by varying the temperature of the oven or speed of the bar with respect to the oven.

Method for producing optical fiber preforms and device to implement said

The telecommunications cable of the invention comprises a series of optical fibers which are preferably coated with respective colored identification layers, the fibers being split into modules each of which is enveloped by a thin supporting sheath that is easily torn, with different sheaths preferably being of different colors, the sheaths being in contact with the optical fibers, and a protective covering being in contact with the supporting sheaths.

Optical fiber telecommunications cable

A hollow silica bar is formed on a mandrel by an external deposition method using a plasma torch. The mandrel is removed and on the inner face of the bar is deposited a vitreous coating to be used for the subsequent formation of the core of the fibers. Deposition is obtained by means of a plasma column, formed in the bar as a result of an ultra-high frequency coupler able to inject a travelling surface wave into the plasma column.

Process for producing preforms for optical fibers

A composite reinforcing element, especially a reinforcing cable, having a core consisting of a thread of non-metallic material and being coated in a reinforced polymer, and a process for producing it.

Composite reinforcing elements and processes for producing them

A process for making a fiber optic coupler. An optical fiber reception block of rigid material that has orthogonal longitudinal and transversal planes of symmetry, an arcuate fiber receiving groove extending along the longitudinal plane of symmetry, and a plurality of reference surfaces is provided. An optical fiber is glued into the groove and the block is cut along a plane perpendicular to the longitudinal and transversal planes of symmetry to remove part of the fiber. The block is then cut in half along the transversal plane of symmetry, the two halves are superimposed in inverted positions and aligned by using a reference surface. This process forms a multibranch coupler that finds numerous applications in telecommunication systems.

Process for coupling optical fiber in reception block and coupler

The cable consists of a central core including helical grooves at its periphery and a composite sheath. Each groove receives at least one optical fibre. To obviate any distortion near the optical fibres as a result of cable laying and of high isostatic pressures in operation of the order of 8 daN/mm.sup.2, the center of the core is constituted by a strand of metal wires and by a metal grooved jacket therearound. The sheath comprises a metal inner jacket which closes the grooves but does not press on the fibres, an insulting jacket, a second metal jacket and an outer insulating jacket.

Optical fibre submarine cable

For continuous manufacture of optical fibers, bars of homogeneous silica-base material are welded in end to end relation. A silica cladding containing a proportion of index varying dopant which varies as the diameter of the cladding increases is progressively applied on a bar at a time to form successive preforms and the welded preforms are drawn out into fibers.

Method and apparatus for fabricating optical fibers

A method for on-site connection of two transmission cables comprising optical fibres, each cable having a protective armouring enclosing a central core provided with regularly spaced grooves on its periphery. Each groove holds a fibre provided with a thin sheath of uniform thickness. After the end of one of the cables has been bared over a given length, the uncovered fibres are moved towards the exterior and secured to a holder surrounding the cable. Thereafter the core is cut perpendicularly to its axis and a grooved portion of an extension core is secured thereto; the fibres are bent back into the grooves in the said portion, and the core portion and the fibres which it bears are cut and subsequently coated with a lubricant. The same operations are performed on the end of the other cable and the two cables are clamped together under a predetermined pressure. Various devices for the embodiment of the method are described.

Method for on-site connection of cables with optical fibres

Device for providing the end portions of the fibers of a flat optical fiber ribbon with connectors. It comprises an elongated connector having two adjacent inner surfaces defining a re-entrant orthogonal connector dihedron and two adjacent outer surfaces defining a projecting orthogonal connector dihedron and a third surface formed with at least a longitudinal groove, and a template having a first and a second adjacent surfaces defining a re-entrant orthogonal template dihedron. At least two members transverse to the template bear a first groove for receiving the sheathed part of the optical fiber and a second groove aligned with the first groove for receiving the stripped part of the fiber. The projecting connector dihedron is applied against the re-entrant template dihedron and the fiber is guided in the grooves on each side of its path along the connector groove, whereby it can be bonded to the connector in predefined position.

Device for terminating the fibers of an optical fiber ribbon with

Apparatus for on-site connection of two transmission cables comprising optical fibres, each cable having a protective armouring enclosing a central core provided with regularly spaced grooves on its periphery. Each groove holds a fibre provided with a thin sheath of uniform thickness. After the end of one of the cables has been bared over a given length, the uncovered fibres are moved towards the exterior and secured to a holder surrounding the cable. Thereafter the core is cut perpendicularly to its axis and a grooved portion of an extension core is secured thereto; the fibres are bent back into the grooves in the said portion, and the core portion and the fibres which it bears are cut and subsequently coated with a lubricant. The same operations are performed on the end of the other cable and the two cables are clamped together under a predetermined pressure. Various devices for on-site connection of cables with optical fibres are described.

Apparatus for on-site connection of cables with optical fibres

An adjustable connector assembly for a laser effect diode, a focussing lens and an optical fibre in an optical fibre transmission system comprising a tubular body generally symetrical about the axis. One end of the tubular body, namely the front end, is provided with an adjustable diode socket assembly means including a first adjustment means at the front end and a socket means for filtering the focussing lens. The other end of the tubular body is provided with a fibre assembly means including transverse second adjustment means so that the ends of the optical fibres may be adjustably positioned in the transverse or xy plane relative to the axial direction, the Z axis of the tubular body. Thus the luminous ray or beam diverted by the diode is adjustable by the first adjustment means at the front end which can vary the position of the diode to the focussing lens in the Z divertion, e.g., axial direction, the transverse or xy adjustment at the fibre optic ends being provided by the second adjustment means at the other end of the connector. The connector is characterized in that said first adjustment means (10) comprises a first socket (21) carrying said diode (D) and secured with tight friction in a second socket (22) insertable in a predetermined position in the body (1) and in which a third socket (23) carrying the lens (4) can slide with easy fit. The connector also comprises radial fingers (232) screwed in the third socket (23) for positioning the lens, said fingers being freely guided in the axia direction through slots (103) provided in the body (1) and displaceable or immobilizable in said axial direction by means of nuts (24) framing said fingers and screwed on the outer periphery of said body.

Adjustable connector assembly for laser effect diode, focussing lens and

Method for splicing optical fiber cables which applies to those cables having an axial core and fibers disposed around the core, parallel to the cable axis or having a slight slant with respect thereto. At the places where splicing will have to be made, when the cable is laid down, the jacket of the cable is removed the fibers are glued on the core and two half-shells are disposed round the glued fibers and encase them. The half-shells are bonded to the core and fibers by gluing under pressure. When the glue has set, the half-shells together with the fibers and cable core are sawn perpendicularly to the cable axis which gives two half-shell segments. These segments have registering bores and splicing is achieved by inserting calibrated columns or pins into these bores.

Growing community of inventors

Tregastel, France

Georges E Le Noane