Abstract: The invention concerns the area of nonlinear fiber and integrated optics, to be exact the area of completely optical switches, modulators and optical transistors, in which solitons are used. The technical problem of the invention is the diminution of pump energy fed into optical waveguide, and also increase of sharpness and depth of switching, and gain of optical transistor, and switching speed as well. One variant of the method consists in that into input of tunnel-coupled waveguides having cubic nonlinearity and the second-order dispersion, they feed radiation as fundamental solitons or pulses close to them in amplitude and in shape with various maximum intensity, which is in limits from 0.6IMup to 1.4IM, where IM is the critical intensity. In other variants of the method additionally into the input of the same or other waveguide they feed radiation, which intensity is much less comparable with the soliton's intensity. In particular, this radiation can be as solitons.

Abstract: The invention has improved parameters when compared iwth prior art devices; pump power was decreased by four orders of magnitude and amplification of signal was increased by two orders of magnitude. The main features of the invention are the following. A nonlinear optical waveguide is made on the basis of a layered MQW-type structure, where unidirectional distributively coupled waves (Ip, Is), e.g. coupled waves having orthogonal polarizations, interact. The wavelength of optical radiation is chosen close to the wavelength of resonance in the structure. Input/output elements, taking into account the asymmetry of the cross section of the nonlinear optical waveguide, are mounted at the input and output of the nonlinear waveguide making up a compact nonlinear-optic module. A small electric current is injected across said nonlinear optical waveguide through electrodes, so as to increase the gain and decrease the pump optical power to a high degree.

Abstract: The invention has improved parameters when compared with prior art devices, pump power was decreased by four orders of magnitude and amplification of signal was increased by two orders of magnitude. The main features of the invention are the following. A nonlinear optical waveguide is made on the basis of a layered MQW-type structure, where unidirectional distributively coupled waves (Ip, Is), e.g. coupled waves having orthogonal polarizations, interact. The wavelength of optical radiation is chosen close to the wavelength of resonance in the structure Input/output elements, taking into account the asymmetry of the cross section of the nonlinear optical waveguide, are mounted at the input and output of the nonlinear waveguide making up a compact nonlinear-optic module. A small electric current is injected across said nonlinear optical waveguide through electrodes, so as to increase the gain and decrease the pump optical power to a high degree.

Abstract: The invention concerns to area of magneto-optics, nonlinear-optics, fiber optics. The invention allow to amplify Faraday effect drastically and obtain a high level of modulation of optical radiation at very small amplitudes of modulating variable current. So it provides a very high speed of modulation of optical radiation. It also gets an opportunity of reading the information with higher density of record. The modulator on the basis of magneto-optical Faraday effect contains optically connected: optical element made from magneto-optical material with means creating a variable magnetic field in it, a nonlinear-optical waveguide and a separator of waves having orthogonal polarizations. The possibility for rejection of atmosphere fluctuation and jamming is provided. The nonlinear-optical waveguide can be made on the basis MQW-type structure.

Abstract: The method for switching optical radiations having orthogonal polarization includes the steps of inserting a linearly polarized wave into the input of a birefringent object (an optical waveguide or crystal) and feeding a small polarized small optical signal is also orthogonally into the object. The polarization vector of the linearly polarized pumping signal or of the optical signal is directed along an optical axis of the birefringent object or at a small angle to the optical axis. The pumping intensity is selected to be higher than the threshold value I.sub.p, which is proportional to a difference between the effective refractive indices of orthogonally polarized radiations and inversely proportional to a cubic nonlinear coefficient of the object. In addition, the intensity of the optical signal radiation is varied from zero to a maximum value of <0.1 I.sub.p.