Abstract: The invention relates to a device for making a comparison between N nominal wavelength values (&lgr;ei) and the wavelength values of optical signals coupled respectively to input ports (GEl) of a phasar whose structure comprises a grating (R) of guides (Gj). According to the invention, the phasar comprises two monitoring output ports (A,B) respectively placed about focal points corresponding to two interference orders of the grating (R) designed to collect the combination of the said signals, and its structure is designed so that the transmission function approximates to a triangular shape in order to widen the monitoring span. The invention applies notably to the wavelength 15 monitoring of a tuneable optical source.

Abstract: The invention relates to a device for making a comparison between N nominal wavelength values (&lgr;ei) and the wavelength values of optical signals coupled respectively to input ports (GE1) of a phasar whose structure comprises a grating (R) of guides (Gj) According to the invention, the phasar comprises two monitoring output ports (A,B) respectively placed about focal points corresponding to two interference orders of the grating (R) designed to collect the combination of the said signals, and its structure is designed so that the transmission function approximates to a triangular shape in order to widen the monitoring span. The invention applies notably to the wavelength 15 monitoring of a tuneable optical source.

Abstract: A wavelength tunable laser emission component includes on the same substrate an active emission section and a Bragg section that includes a waveguide in which is formed a plurality of individual Bragg gratings corresponding to particular Bragg wavelengths. The waveguide has an electro-absorbent structure, the subsections of the Bragg section each being voltage-controlled. The laser emission wavelength is tuned to one or other of the Bragg wavelengths of these subsections according to control voltages applied thereto.

Abstract: Sample grating distributed Bragg reflector laser, very widely matchable by phase variation, and a process for using this laser.This laser comprises an active section (32) and two sample grating sections (34, 36) placed on each side of the active section, respectively, each sample grating section comprising phase parts (48, 52) alternating with grating parts (50, 54), and means (62, 64, 70, 72) of injecting current into the phase parts and into grating parts independently for each sample grating section.Application to telecommunications by optical fibres.

Abstract: A wavelength-tunably distributed Bragg reflector laser having selectively activated virtual diffraction gratings including a semiconductor guide layer (4) between two other semiconductor confinement layers (6,8) of opposite dopings. A passive part of the laser has sections (SC1, SC2, SC3), each of which include a periodic arrangement (A) spatially modulating the distribution of the carriers or the electric field in the guide layer when a current is injected into the p-n junction formed by the two other layers or where the junction is reverse biased to create a diffraction grating. Each section has an effective optical index cooperating with the corresponding diffraction grating in order to give a predetermined Bragg wavelength for the section.

Abstract: Optical component having a plurality of Bragg gratings and process for the production of said component.According to the invention, an optical component is formed comprising a light guide and Bragg gratings which are formed in the guide and have predetermined Bragg wavelengths. This guide comprises a single diffraction grating (16) and zones (24, 26, 28, 30) associated with the Bragg gratings and. The zone have optical indices chosen so as to obtain, in cooperation with the diffraction grating, the Bragg wavelengths.