Abstract: An optical coupler comprises at least one optical fiber (1), one laser (2), one photodiode (3), one focusing lens (30) for focusing on the fiber and one plate (41) which reflects the rays coming from the fiber (1) towards the photodiode (3). In order to prevent a ray sent out by the laser (2) from returning to the photodiode (3) after reflection on the input diopter (4) of the lens (30), the optical axis is broken at the height of this diopter (4) by means of a prism (5). The reflected rays do not return to the plate (41).

Abstract: The disclosure relates to integrated circuits of lasers, wherein the linear arrays are supplied in series, with a return of current through the substrate. When the substrate is semi-insulating, only the first epitaxially grown layer is conductive. To reduce its electrical resistance, a surface film of the substrate is made conductive by diffusion of a dopant. Application to power semiconductor lasers.

Abstract: The invention applies to a laser integrated circuit comprising at least one row of lasers (30) lying between two reflector strips (28). The lasers (18) are electrically connected in parallel. The light emission along the strip will be more uniform if the electrical current is distributed by two "combs" whose "teeth" are parallel to the laser ribbons (18) and interleaved with them. The terminal metallized area (44) for the first comb is deposited at the bottom of a recess (18) and the terminal metallized areas (45) for the second comb are on the surface of the row. Such a device finds particular application to the power supply for laser integrated circuits.

Abstract: The invention applies to a row of semiconductor lasers. To dissipate the heat generated during operation, this row of lasers is wired by a thick metal tape (11) brazed (points 12) to the mesas (9) which surround the laser cavities (2). The other electrical polarity is applied by the support plate (3) through the substrate (1).

Abstract: A method for the alignment of an optical fiber on the optical axis of a light-emitting or light-receiving semiconductor component uses only line contacts between the metal parts. With the component being fixed to a base provided with two grooves, and the fiber being provided with a sleeve, the position of the fiber is determined in polar coordinates by at least two plates which lie in grooves and form angles that are adjustable. The positions are fixed by laser soldering when the alignment is obtained. The device can be applied to optical heads.

Abstract: The disclosure relates to the field of optical components in which a fiber is aligned on a laser, LED or similar device. The fiber is fixed into a sleeve clamped by a "keyhole" shaped clamp. The optical component is fixedly joined to a base in which a slot is parallel to the optical axis of the component. The clips of the clamp are introduced into the slot which is designed to give three degrees of liberty. When the alignment is obtained in dynamic operation, the parts are fixed by solders made by laser. The device can be applied to optical heads.

Abstract: An optic head designed to be fitted into a hybrid circuit. This optic head includes at least one optoelectronic semiconductor assembly and one optic fiber in alignment. In order to attach it to a hybrid circuit, the elements are all mounted on a metal wafer which serves as a reference plane. The fiber is brazed or bonded to the wafer by means of a metal tube which supports a lens. Optic head has a second optoelectronic assembly also fixed to the metal wafer, a dichroic mirror or a semi-reflecting plate sends the light beam back to the second assembly. A filter may be provided to improve the separation of the light beams. The present invention finds application to multiplexers, demultiplexers, duplexers and optic couplers.

Abstract: The disclosure concerns semiconductor lasers in which the current has to be localized, preferably in the emissive strip. In a laser having at least one emissive strip and a contact for current injection, the current is localized on the strip by means of an overdoped well that goes through the confinement layer with doping gradient. This confinement layer is doped to a level of 10.sup.18 at.cm.sup.-3 in the vicinity of the strip and to a level of 2.10.sup.17 at.cm.sup.-3 in the vicinity of the injection contact. The disclosed device can be applied to telecommunications and data processing by optical fibers.