Abstract: The light emitter comprises a self-pulsating laser (2) producing a self-pulsating signal at a given self-pulsating frequency (fSP) and a modulator device (3) suitable for generating a frequency shift keyed signal (FSP) about a frequency corresponding to a subharmonic (fSP/n) of the self-pulsating frequency of the laser. The modulator circuit is designed to enable the self-pulsating signal to be synchronized by a harmonic of the generated encoded signal. The self-pulsating laser is modulated by a signal at a carrier frequency corresponding to a subharmonic (fSP/n) of the self-pulsating frequency of the laser, thus enabling phase noise to be eliminated from the self-pulsating signal (fSP) by ensuring perfect phase-locking between the self-pulsating signal and the modulated signal. Such an emitter is particularly suitable for application in a radiofrequency transmitter unit using a light medium.

Abstract: A stabilised gain semiconductor optical amplifier (CG-SOA) includes and active waveguide (1) comprising an amplification medium (2), extending in longitudinal (Z), lateral (X) and vertical (Y) directions, and coupled to a laser oscillation structure comprising at least two resonant cavities (13, 14) extending in first (D1) and second (D2) directions which are different from the longitudinal direction (Z) of the active waveguide (1) and arranged in such a way as to permit the establishment of laser oscillations having at least two different relaxation oscillation frequencies.

Abstract: An optical resonant cavity (50) defined between two mirrors (13′, 40), one of which (40) is a variable pitch Bragg reflector grating, is characterized in that a parameter CS of variation of the Bragg wavelength of the grating is such that the cavity resonates continuously from a first optical frequency to a second optical frequency higher than the first optical frequency. The invention can be used in particular to produce broadband band-pass filters with steep flanks, broadband amplifiers with no gain fluctuation, and continuous emission spectrum lasers and light-emitting diodes.

Abstract: A light pulse generator (1) having a distributed Bragg reflector is characterized in that the reflector is a sampled Bragg reflector grating (40) a plurality of reflection peaks, each peak corresponding to a reflection frequency value, the difference between consecutive reflection frequency values being equal to an integer multiple P of the difference between consecutive values of mode frequency at which an optical cavity formed between a rear face (13′) of an active layer and a reflection point of the reflector (40) is resonant. Very short pulses are thus obtained with low time jitter.

Abstract: An optical resonant cavity (50) defined between two mirrors (13′, 40), one of which (40) is a variable pitch Bragg reflector grating, is characterized in that a parameter CS of variation of the Bragg wavelength of the grating is such that the cavity resonates continuously from a first optical frequency to a second optical frequency higher than the first optical frequency. The invention can be used in particular to produce broadband band-pass filters with steep flanks, broadband amplifiers with no gain fluctuation, and continuous emission spectrum lasers and light-emitting diodes.