60 results about "Optical logic gates" patented technology

Systems and methods for modulating light with light in high index contrast waveguides clad with graphene. Graphene exhibits a large nonlinear electro-optic constant χ³. Waveguides fabricated on SOI wafers and clad with graphene are described. Systems and methods for modulating light with light are discussed. Optical logic gates are described. Waveguides having closed loop structures such as rings and ovals, Mach-Zehnder interferometer, grating, and Fabry-Perot configurations, are described. Optical signal processing methods, including optical modulation at Terahertz frequencies, are disclosed. Optical detectors are described. Microelectromechanical and nanoelectromechanical systems using graphene on silicon substrates are described.

The invention relates to a full-optical logic gate (10), which can be reused to achieve opposite phase operations of an AND gate, an OR gate, an NOT gate, an NAND gate, an NOR gate, an XOR gate, an XNOR gate and combination thereof, and can also achieve a half adder. The full-optical logic gate comprises light input ports (2, 3) for receiving two control light signals respectively, a light input port (1) for receiving a synchronous light clock signal, a light output port (8) for outputting the result for expressing logic application, and a light output port (9) for outputting opposite phase operation. The full-optical logic gate is characterized by comprising a light combination device (4) and a nonlinear optical device (7), wherein the light combination device (4) is used for combining the two control light signals to generate corresponding combined signals with a wavelength division multiplexer or a polarization beam combiner; and the nonlinear optical device (7) is used for receiving the combined signals and the synchronous light clock signal and emitting two paths of light output signals mutual in opposite phase operations. The full-optical logic function depends on the characteristic of the nonlinear optical device, wherein the characteristic is selected so that the power of the output signals and the light power of the clock signal are redistributed and associated through the selected logic function.

A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency. The gating time and bandwidth of the present delayed optical logic gates is invariant to the delayed time of the delayed optical router because IN and OUT bandwidth across the nonlinear medium must be same. The present invention of delayed optical logic gates have potential to keep up ultra-high-bandwidth optical information processing using relatively slow electronic processing devices.

An all-optical linear feedback circuit for use, for example, as a maximal length pseudo random bit sequence generator includes an all-optical logic circuit that is capable of generating 2^N−1 bit maximal length pseudo random bit sequences on an optical channel at high data rates e.g. 80 Gbit/s. In the pseudo random bit sequence generator of the present invention, intensity-dependent phase modulation of at least one included semiconductor optical amplifier (SOA) is implemented. The maximum data rate is limited by the fast gain recovery time of the carriers in the SOA. An optical logic gate of the pseudo random bit sequence generator of the present invention may be constructed using various nonlinear elements that provide ultra-fast intensity-dependent phase modulation.

An optical data latch is formed on a substrate from a pair of optical logic gates in a cross-coupled arrangement in which optical waveguides are used to couple an output of each gate to an photodetector input of the other gate. This provides an optical bi-stability which can be used to store a bit of optical information in the latch. Each optical logic gate, which can be an optical NOT gate (i.e. an optical inverter) or an optical NOR gate, includes a waveguide photodetector electrically connected in series with a waveguide electroabsorption modulator. The optical data latch can be formed on a III-V compound semiconductor substrate (e.g. an InP or GaAs substrate) from III-V compound semiconductor layers. A number of optical data latches can be cascaded to form a clocked optical data shift register.

The invention is about the La-Mg-Ni alloy and the multiple alloy film which can change the color by the H2. The alloy firm has the low hydriding condition, the quick hidriding speed and the big photo-electricity character, good stability and long life. The alloy material forms the alloy film through the codeposition or deposition separately by the sputter method, then to form the nanometer alloy film after the annealing. The alloy film can be used for the H2 detector, temperature bulb, the building materials, the car back mirror, optical logic door, the satellite and the communication apparatus.

The invention discloses a track type micro-ring 2*4 thermo-optic switch prepared based on SOI material. The switch comprises a straight waveguide, a track type micro-ring waveguide prepared based on SOI material, and a thermal electrode arranged at the top layer. For the track type micro-ring waveguide, a bending waveguide and a short straight waveguide forms a closed track; coupling zones are formed between the track type micro-ring waveguide and direct waveguides; and the intersection parts of the direct waveguides employ multimode waveguide intersected structures. A digital electrical signal loaded by the thermal electrode arranged at the top layer is applied to realize rapid switching of optical channels. Therefore, simultaneous switching of the multi-input and multi-output optical signals can be realized; and the track type micro-ring 2*4 thermo-optic switch can be applied to working state detection of unit devices in the optical switch array, the optical routing, the optical logic gate design, and the integrated optical path.

Optical signal processor (1) comprising an optical waveguide loop (3), and first and second phase modulator loops (6, 7), each of the first and second phase modulator loops is in optical communication with the optical waveguide loop, and the first and second phase modulator loops each comprises a respective control signal input port (8, 9) to control phase modulation applied by the phase modulation loops, and the optical waveguide loop comprising two input ports (20a, 20b) to direct input signals (10, 11) in opposite senses in the optical waveguide loop and further comprising an output port (20c) to output resulting signals. The first and second phase modulator loops may comprise nonlinear optical loop mirrors. The processor may be an optical logic gate device.

The invention discloses an all-optical logic gate device based on resonant ring-MIM waveguide coherent regulation and control. The all-optical logic gate device comprises a silicon dioxide substrate plated with an Ag film, a resonant ring-MIM waveguide combined structure arranged on the substrate and formed by air slits, and at least two ports arranged on an MIM waveguide. Symmetric incident conditions are introduced into a single-side or double-side port, and a reasonable output end is arranged; all-optical coherence regulation and control can be realized on the resonant ring-MIM waveguide byadjusting the phase difference of incident light so as to design different logic gate functions including an AND gate, an OR gate, a NOT gate and an XOR gate, and simple switching between different logic gates under the same structure can be completed. The device has potential application prospects in the fields of optical signal processing technologies, ultra-compact photonic integrated devices,sensing technologies and the like.

The invention discloses an SOI-based broadband adjustable beam splitting ratio polarization rotary beam splitter, which comprises a waveguide layer, a thermode, a buffer layer, an input end and an output end, wherein the waveguide layer comprises three sections of tapering ridge waveguides, an S-shaped bent ridge waveguide, a straight waveguide, an Archimedes spiral bent ridge waveguide, a straight ridge waveguide and an output ridge waveguide, the waveguide layer is prepared from an SOI material, the thermode and the buffer layer are sequentially arranged above the waveguide layer, the thermode is prepared from a TiN material, and the temperature of the thermode can be changed by applying a voltage across the thermode. According to the invention, polarization rotation, beam splitting andbeam splitting ratio adjustment of an input optical signal can be realized, and the beam splitter can be applied to a polarization multiplexing system, a coherent light communication system, optical logic gate design and the like, and has the advantages of low insertion loss, simple process, strong reconfigurability, wide working bandwidth and the like.

The present invention provides an EIT-based photonic logic gate, which is constituted by EIT-based stack layers of periodic array of photonic crystal (PCs) layers and EIT (Electromagnetic Induced Transparent) material layers. The input probe signals are incident on the first photonic crystal layer, passing through one or more than one PCs-EIT interfaces and transmitted out from the last EIT material layer. Control filed as the enable signals are incident on each EIT layer to activate the optical logic gate. By varying the detune frequency of probe field and Rabi frequency of control field, its band gap structure can be adjusted. Henceforth, the tunable optical EIT-based photonic logic gate can be achieved as user required.

The invention discloses an optical logic gate device on the basis of coherent feedback, which comprises a laser, polarization beam splitters, a medium unit, logic control gates, an optical fiber coupling frame and a multimode optical fiber. Pump light emitted by the laser enters a first polarization beam splitter and is reflected to the medium unit; after the pump light is subjected to four-wave mixing in the medium unit, an output light beam is generated and is emitted by a second polarization beam splitter to form a ring-shaped light spot and two bright spots in the vertical direction; two beams of feedback light are generated from the bright spots by a third polarization beam splitter; and the feedback light is controlled by a first logic control gate and a second logic control gate, enters the first polarization beam splitter by the optical fiber coupling frame and the multimode optical fiber and is crossed with the pump light in the medium unit. According to the invention, an optical logic OR gate and an optical logic NOR gate can be simultaneously implemented; and the optical logic gate device has the advantages of high ascending speed, consistent logic level, capability of controlling strong light by weak light and the like. The invention also discloses a working method of the optical logic gate device on the basis of coherent feedback.

The invention provides a vortex light coding all-optical logic gate based on binary phase shift keying, and an implementation method thereof. The vortex light coding all-optical logic gate structure based on binary phase shift keying comprises a substrate 1, a nanometer metal film 2, an annular nanometer groove 2-1 and an output port 3. The output port 3 is positioned in the center of the annularnanometer groove 2-1. According to the specific implementation method, two beams of orthogonal vortex light are input from the lower surface of a substrate 1 to serve as input signals, and 1 and 0 ofan input logic state are defined by regulating and controlling the phase shift of the input signals. Vortex light excites surface plasmas (SPPS) in the annular nanometer groove 2-1, and the SPPs are transmitted along the surface of the nanometer metal film 2 and converged at the output port 3. Different SPPs intensity values at the output port 3 are respectively defined as different output logic states. Seven basic logic gate functions can be realized on a single structure by adjusting the relative phase difference of the input signals.