Abstract: An electroluminescent and photodetector diode comprises two electrodes made of materials which are transparent to a radiation of given frequency band, and, arranged between these two electrodes, a very thin layer of a material absorbing said radiation. This diode can be used in a busbar line.

Abstract: The invention relates to a manual and portable device for crimping ferrules onto bundles of optical fibres comprising a number of fibres such that these fibres may be hexagonally arranged. The device primarily comprises means for holding the ferrule in the tool, crimping means essentially consisting of an element supporting three knurled rollers which is capable of being rotated whilst the three knurled rollers, at the same time as rotating, may be moved progressively nearer the axis of the bundle until their spacing corresponds to the minimum cross-section of the bundle. The device may also comprise a release mechanism enabling the approach movement of the knurled rollers to be stopped when this cross-section is reached.

Abstract: The present invention relates to an end structure for a bundle of optical fibres arranged in a hexagon which comprises more particularly a cylindrical alignment member having one end which is adjacent to the end to be connected and comprises three regular points adapted to be fitted in three similar points of an identical end structure. This alignment member is previously angularly oriented relative to the bundle of fibres arranged in a hexagon so that its points have a given position relative to the hexagon formed by the fibres.

Abstract: A multichannel coupler for connecting a plurality of input fibers to a plurality of output fibers which comprises a mixing fiber coupled to the pluralities of fibers. This mixing fiber is cut along a transversal cut and the two parts thus obtained are secured end to end. At least one of the surfaces delimiting the cut is ground for having a better distribution of the transmitted light onto the output fibers.

Abstract: The invention relates to a positioning ferrule for an optical fibre providing an adjustable connection between two fibres. The positioning ferrule according to the invention comprises detecting means for detecting the uncoupled radiation in the down-side fibre and therefore transmitted in the sheath of the latter. The process for adjusting a connector comprising said ferrule comprises producing a relative displacement of the axes of two fibres so that the detected radiation is minimum. The invention is applicable to long-distance optical telecommunications employing monomode optical fibres.

Abstract: A brancher-mixer for optical fibres bundles enabling the luminous energy emanating from a transmitting bundle to be divided between two receiving bundles and essentially consisting of two monofibres laterally coupled at one of their ends to divide the luminous flux emanating from the transmitting bundle. The two monofibres are arranged in a common casing provided with mechanical connections to establish the optical connections to the three bundles of fibres.

Abstract: The invention provides a multi-channel optical coupler forming a single component which can be attached to the front panel of an equipment. A single central U-shaped optical fibre acts as a mixer waveguide. The terminal faces of this central waveguide are coplanar and optically connected to the single fibres or to the bunches of fibres, which constitute the incoming and outgoing channels, by two sets of single intermediate mixer fibres. Each intermediate fibre is equipped with a standard mechanical connecting element of detachable design, all these connecting elements being arranged in the same plane.

Abstract: This invention provides a coaxial cable of the type comprising a central electric conductor and a peripheral electrically conducting screen separated from one another by a solid dielectric, this cable further comprising optical fibres embedded in the dielectric and symmetrically distributed between the central conductor and the peripheral screen.

Abstract: The invention provides a substrate for positioning the end of one or more optical fibres in a reference plane. Each fibre is positioned by means of three right circular cylindrical dowels in a staggered arrangement on the flat trued face of a parallelepiped. The substrate may further comprise a single additional optical fibre bearing against the apertures of the transmission fibres and doing duty as a cylindrical lens for coupling each transmission fibre with the emissive zone of a laser diode.

Abstract: This invention provides an optical fibers bundles connector comprising a male member and a female member which can be plugged into one another. In one of these members is included a single fiber of the same diameter as the bundles which are to be connected, which distributes the luminous flux issuing from the emitter bundle to the receiver bundle. An embodiment having the external dimensions of "Socapex 072 NX 65" electrical connectors is specially described.

Abstract: A positioning terminal for an optical fibre or a bundle of optical fibres in which the position of the fibre or bundle is defined relatively to a right circular cylindrical external surface. The centering of the fiber or bundle of the axis of the external surface is achieved by compressing a deformable internal cylindrical body arranged in a coaxial hole and traversed by the fibre or bundle through an axial bore. In the case of a bundle, a compact hexagonal arrangement of the individual fibres ends is thus obtained, and by giving to the coaxial hole an hexagonal cross section, the orientation of the hexagonal arrangement can be marked on the terminal external surface. Methods for manufacturing such a terminal and for arranging it at the end of a fibre or bundle are also described.

Abstract: The present invention relates to a plug which makes it possible with the help of an interconnecting device to position and connect in pairs optical fibres pertaining to optical cables. The positioning of each optical fibre is achieved by a three-elements set of cylindrical rods 21 arranged in the bushing of the plug. Each rod of the three-elements set has two generatrices in contact with its two neighbors, and one generatrix in contact with the introduced optical fibre. A hardenable bonding medium is introduced for cementing together said bushing, said rods and said optical fibre.

Abstract: The invention relates to optical communications by bundles of optical fibres. More particularly, the invention relates to a branching fiber optic connector device for optically and mechanically connecting two bundles of optical fibres with a single optical fibre and for supplying an electrical signal characteristic of the incident optical energy obtained by extracting part of the radiation in said fibre by means of a photodiode sealed to said fibre after removal of the cladding over a surface corresponding to the detecting surface of the photodiode, the refractive index of the sealing material being higher than the refractive index of the cladding.

Abstract: The invention relates to a coupling device for an optical waveguide, using a hologram recorded in a photoresist layer arranged on a face of the waveguide, and capable of coupling a wave having a predetermined wafe front and travelling outside the waveguide and a plane wave travelling inside the guide. The invention also describes a holographic method for manufacturing such a coupling device.