Alcatel Fibres Optiques

Alcatel N.v.

Compagnie Generale D'electricite

Mars Actel

Alcatel Cable Interface

Claude Brehm

Jean-Yves Boniort

Andre Tardy

Philippe Dupont

Pierre Sansonetti

Jose Chesnoy

Jacques Auge

Bruno Lavigne

Lionel Vandenbulcke

Jean-Pierre Dumas

Pascale Nouchi

Roland Hakoun

Georges Roussy

Josiane Ramos

Bertrand Joly

Jacques Com-Nougue

Jean-Louis Brisset

Dominique Brouard

Pierre Lerner

Denis Robion

Henri Gagnaire

Olivier Mercereau

Yves Floury

A method of manufacturing a multi-core optical fiber, the method including assembling together a plurality of substantially identical single-core optical fiber preforms (2', 2'), referred to as 'single-core preforms', each of which includes a core bar (3) surrounded by a layer of optical cladding (4), so as to form a 'multi-core preform' (10) and drawing down the multi-core preform (10) so as to obtain the multi-core optical fiber. The assembly step includes securing the single-core preforms (2', 2') to one another by fusing them over their entire lengths or over portions thereof along their tangential lines of contact (T), without inserting the multi-core preform (10) into a holding tube. A vacuum is maintained in the preform during the drawing step, the vacuum being formed before or during the drawing step.

Method of manufacturing a multi-core optical fiber

A method of manufacturing a multi-core optical fiber, the method including assembling together a plurality of substantially identical polished single-core optical fiber preforms (2', 2'), referred to as 'single-core preforms', each of which includes a core bar (3) surrounded by a layer of optical cladding (4), so as to form a 'multi-core preform' (10), and drawing down the multi-core preform (10) so as to obtain the multi-core optical fiber. The assembly step includes securing the single-core preforms (2', 2') to one another by fusing them over their entire lengths or over portions thereof along their tangential lines of contact (T), without inserting the multi-core preform (10) into a holding tube. A vacuum is maintained in the preform during the drawing step, the vacuum being formed before or during the drawing step.

Method of applying an amorphous boron-based protective coating to an

Optical fiber coated with an amorphous boron protective layer, and a

Monomode optical fiber

A method of detecting variation in the diameter of an optical fiber includes the following steps:

Method of detecting variation in the diameter of an optical fiber and

The multiferrule for connecting optical fibers together has a series of internal capillary channels of transverse dimensions that are defined to leave substantial clearance for the fibers, at least in the two end portions of the channels where they open out into two end faces of the multiferrule. The multiferrule further includes middle necking in which the corresponding middle portions of the channels have their transverse dimensions reduced so as to leave only minimal clearance for the fibers, to enable them to be put into contact and connected together directly in this location. The multiferrule is applicable to making an optical fiber connector.

Multiferrule for connecting optical fibers together, a connector

A method of preparing a subassembly for connecting an integrated optical device (21) to an optical cable:

Preparation and execution methods for splicing an integrated optical

The method of manufacturing a multiferrule for optical fibers, the method consisting in fiber drawing a preform of silica that includes a plurality of mutually parallel channels, the method being characterized by the fact that said preform is made from a rod (1) of silica having a plurality of longitudinal grooves (3) uniformly distributed about an axis (2) and closed by at least one piece of silica (4) for defining said plurality of channels.

Method of manufacturing a multiferrule for optical fibers

A method of splicing two optical fiber cables uses a glass multi-ferrule having a series of parallel axis internal capillary channels opening onto respective end surfaces of the multi-ferrule and two exterior reference surfaces. An adhesive that is polymerized by ultraviolet light is introduced into these channels. The multi-ferrule is cut into three sections. The splicing is achieved by jointing the outermost two sections.

Method of splicing two optical fiber cables

Apparatus for heating a silica optical fiber in a fiber-drawing installation. The apparatus is disposed at the outlet of a fiber-drawing oven to raise the optical fiber to a temperature greater than 1000.degree. C. The apparatus is constituted by a microwave generator coupled to a resonant cavity formed by a helically-wound metal wire helix fixed at opposite ends to two short circuit metal plates respectively, with the optical fiber running substantially along the axis of the helix and the helix concentric about the running fiber.

Method and apparatus for heating a silica optical fiber in a

Apparatus for treating the surface of a body by corona discharge, the apparatus comprising:

Apparatus for surface treatment by corona discharge

The invention relates to a method of making multi-ferrules. It provides a method of making multi-ferrules from a vitreous material, the multi-ferrules having a series of cylindrical channels with parallel axes. The method is characterized in that it comprises the following steps:

Method of making multi-ferrules having a series of channels with

Optical fiber suitable for use in optical time domain reflectometry and method of manufacturing the fiber. The method of manufacturing the optical fiber suitable for use in optical time domain reflectometry includes, during drawing of the fiber (2), a thin continuous coating is deposited on the fiber. A part of the coating is thereafter removably ablated in the form of a helix (15) coaxial with the fiber by rotating a laser beam (17) in a plane orthogonal to the axis simultaneously with axial movement of the fiber.

Optical fiber suitable for use in optical time domain reflectometry and

A method of providing a preform for a polarization-maintaining optical fiber, starting from a basic preform (1) having two orthogonal planes of symmetry intersecting along its axis, and mechanically applying two discrete preformed oblong elements (15) of silica doped with boron oxide on the outside face of said basic preform symmetrically about the first plane (20), and two oblong elements of silica doped with titanium oxide on the outside face of said basic preform and symmetrically about the second plane (30). The shapes of the basic preform and the four oblong elements are selected to define a substantially solid cylinder.

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Montrouge, France

Claude Brehm