Abstract:
The present optical waveguide device, which improves the optical phase rotation efficiency with respect to activation voltage, includes: a substrate having electro-optic effects; a Mach-Zehnder optical waveguide formed on the substrate; and a signal electrode. The signal electrode is formed in an integrated manner such that an electric signal for applying the electric field travels from an upper part of either one of the two interference optical waveguides, which form the Mach-Zehnder optical waveguide, to an upper part of the other one of the two, and also, a periodical polarization characteristics region, in which regions opposite to each other in polarization are alternately arranged, being provided for a part of the other one of the interference optical waveguides on the substrate.
Abstract:
A method of fabrication of an electrooptical device comprises depositing a colloid system of anisometric particles onto at least one electrode and/or onto at least one substrate and/or onto at least one layer of an isotropic or anisotropic material to form at least one layer of an electrooptical material, externally aligning the colloid system to form a preferred alignment of the colloid system particles, drying the colloid system, and forming at least one electrode and/or at least one layer of an isotropic or anisotropic material on at least a portion of the layer of the electrooptical material.
Abstract:
An optical waveguide with at least a guiding lamina (10) of optical material bonded by direct interfacial bonding to a superstructure lamina (20) of optical material, in which regions of the guiding lamina have modified optical properties so as to define a light guiding path along the guiding lamina. In a particular example, a periodically poled LiNbO3 planar waveguide is buried in LiTaO3 by direct interfacial bonding and precision polishing techniques and used in an optical frequency doubling system.
Abstract:
The present invention relates generally to an apparatus that increases the conversion efficiency of optical parametric oscillators and also reduces overall system size and susceptibility to vibration. The first embodiment of the present invention incorporates a PPLN OPO architecture which includes mirrored coatings on the entry surface area and exit surface area of a monolithic nonlinear optical medium. The coatings act as mirrors, however, the mirrors are actually affixed to the PPLN element. In the first embodiment of the present invention, the PPLN element is a dual grated element. The second embodiment of the present invention uses a single grated PPLN element.
Abstract:
A phase shifter includes an optical waveguide, a plurality of impurity regions and a plurality of electrodes. The optical waveguide receives an optical input signal and outputs an optical output signal. The impurity regions include respective charge carriers. The impurity regions are disposed in contact with the optical waveguide at respective contact surface, where at least one of the contact surfaces has a zigzag pattern. The electrodes are connected to the respective impurity regions. Application of an electrical signal to at least one of the electrodes phase-shifts the optical output signal with respect to the optical input signal. Therefore, the phase shifter may efficiently vary a magnitude of the phase shift of the optical output signal.
Abstract:
There is provided a stable optical element having a fine, uniform, and wide-ranging domain inversion structure in a ferroelectric crystal. This includes a plurality of domain inversions (101) formed on an MgO:LiNbO3 substrate (100), and a groove (102) formed on the substrate surface between the domain inversions (101). The depth T′ of substantially all of the domain inversions (101) satisfies the relation T′
Abstract:
A wavelength converter device is provided for generating a converted radiation at frequency ωg through interaction between at least one signal radiation at frequency ωs and at least one pump radiation at frequency ωp, including an input for the at least one signal radiation at frequency ωs, a pump light source for generating the at least one pump radiation at frequency ωp, an output for taking out the converted radiation at frequency ωg, a structure for transmitting the signal radiation, including two optical resonators having a non-linear material, having an optical length of at least 40*λ/2, λ being the wavelength of the pump radiation, and resonating at the pump, signal and converted frequencies ωp, ωs and ωg, wherein by propagating through the structure, the pump and signal radiation generate the converted radiation by non-linear interaction within the optical resonators.
Abstract:
An attenuating counter-propagating (ACP) optical phase modulator introduces zero propagation delay. An optical field is modulated by an electromagnetic field. Within the ACP modulator, the optical field is propagated in an opposite direction to the propagation direction of the electromagnetic field. The electromagnetic field is attenuated within the ACP modulator. In an example embodiment, the length of the modulator is greater than the attenuation length of the electromagnetic field.
Abstract:
There is provided a stable optical element having a fine, uniform, and wide-ranging domain inversion structure in a ferroelectric crystal. This includes a plurality of domain inversions (101) formed on an MgO:LiNbO3 substrate (100), and a groove (102) formed on the substrate surface between the domain inversions (101). The depth T′ of substantially all of the domain inversions (101) satisfies the relation T′
Abstract:
An electrooptical device is provided comprising at least one substrate, at least one pair of electrodes and at least one layer of an electrooptical material. The electrooptical material represents an optically anisotropic thin crystal film and contains molecules having aromatic rings and possessing a lattice with an interplanar spacing (Bragg's reflection) of 3.4±0.2 Å along one of optical axes. The electrooptical material has anisotropic refractive indices and/or anisotropic absorption coefficients that are depended on an electric field strength.