Abstract: An acousto-optical tunable filter, comprising planar optical waveguide (2) for propagation of light beam (14), and arranged sequentially along the path of the light radiation: a means for forming a light beam, transducer (16) of acoustic waves suited to generate acoustic wave (15) that is capable of interacting with the beam light waves and cause their diffraction within a predetermined wavelength range, and a means for selecting the diffracted portion of the light beam.

Abstract: An integrated optical filter device that is tunable with a narrow linewidth and fast operation, and that can be configured to perform a number of filtering functions, including pass-through and multi-channel drop functions, redirecting optical radiation of different wavelengths into different optical channels. The filter device is easy to fabricate inexpensively and reliably using existing technology and is compact and more densely packed than devices produced by the prior art, even for low refractive index materials, in that it uses substantially straight rather than curved strip optical waveguides. Wavelength tuning can be accomplished by means of a number of alternative control arrangements and configurations.

Abstract: A radiation beam expander includes planar optical waveguide (2) and stripe waveguide (3) provided with a set of unit reflectors (4) that overlap its aperture, and is arranged in the plane of planar waveguide (2), within said waveguide itself or in the vicinity thereof, with providing the possibility of transition of light beams (6′), reflected by unit reflectors (4), into planar waveguide (2). Angle of inclination and arrangement of unit reflectors (4) being selected such that phase difference on the operating radiation wavelength, for any pair of beams (6′) reflected from different unit reflectors (4), is essentially multiple of 2&pgr;.

Abstract: An integrated optical filter device that is tunable with a narrow linewidth and fast operation, and that can be configured to perform a number of filtering functions, including pass-through and multi-channel drop functions, redirecting optical radiation of different wavelengths into different optical channels. The filter device is easy to fabricate inexpensively and reliably using existing technology and is compact and more densely packed than devices produced by the prior art, even for low refractive index materials, in that it uses substantially straight rather than curved strip optical waveguides. Wavelength tuning can be accomplished by means of a number of alternative control arrangements and configurations.

Abstract: A radiation beam expander includes planar optical waveguide (2) and stripe waveguide (3) provided with a set of unit reflectors (4) that overlap its aperture, and is arranged in the plane of planar waveguide (2), within said waveguide itself or in the vicinity thereof, with providing the possibility of transition of light beams (6′), reflected by unit reflectors (4), into planar waveguide (2). Angle of inclination and arrangement of unit reflectors (4) being selected such that phase difference on the operating radiation wavelength, for any pair of beams (6′) reflected from different unit reflectors (4), is essentially multiple of 2&pgr;.