Abstract: Electrically controlled Fabry-Perot resonator elements are created in a semiconductor channel waveguide by etching two in-channel mirror facets (slots) and by positioning the resulting resonator core in the midregion of a P-I-N diode or field-effect transistor. A large number of FPs can be built monolithically on one semiconductor chip, with FPs connected by on-chip passive waveguides used for multiple on-chip time delays. The low-loss chips are coupled efficiently in end-fire fashion to a group of optical fibers that comprise the optical signal processing system. III-V quantum-well, superlattice, and n-i-p-i materials are preferred for the semiconductor devices, and a variety of electrooptical effects are available for use, including the quantum-confined Stark effect, phase-space absorption quenching, Wannier-Stark effect, plasma dispersion effect, and band-flattening.

Abstract: Apparatus is described for achieving wavelength selection. Furthermore, the apparatus exhibits very high wavelength resolution, stable operation and rapid returning. A bundle of multi-wavelength light, entering the device, is acoustooptically deflected. This is done by driving two orthogonal acoustic transducrs of the deflector with two suitable frequencies fx and fy. The light so deflected passes first through a wedge etalon having a taper along the X-axis and then through a second wedge etalon having a taper along the Y-axis. The pair of wedges forms two, single-cavity etalons. Depending on the choice of fx and fy, any wavelength within the wavelength range covered by the two, single-cavity etalons can be selected rapidly and accurately.

Abstract: A laminated glazing unit is disclosed having controllable transparency to visible light and a solar load reduction element which preferentially excludes infrared radiation while being substantially transparent to visible light. The solar load reduction element comprises a Fabry-Perot interference filter which includes a film stack deposited on the laminated surface of the outer ply of the glazing unit. The film stack includes at least a zinc oxide film followed by a silver metal film followed by a second zinc oxide film followed by a second silver metal film followed by a dielectric film which provides good long term adhesion durability to an adjacent laminating layer of PVB or like material. The dielectric film preferably is zinc oxide with a thin overcoat of chromium oxide, SiO.sub.2 or, alternatively, is tantalum pentoxide.