38results about How to "Low modulation voltage" patented technology

A field emission electron source includes a substrate, a first conductive electrode terminated to provide electrons, an emitting composite layer for emitting electrons, and a second electrode insulated from the emitter layer and terminated to extract electrons through vacuum space. The emitting composite layer lies between and parallel to the said first and the second electrodes, and comprises nano-structures embedded in a solid matrix. One end of the nano-structures is truncated and exposed at the surface of the emitter layer so that both the length and the apex of the nano-structure are regulated and the exposed nano-tips are kept substantially the same distance from the gate electrode. The embedding material is chosen to form triple junctions with the exposed tip to further enhance the field.

In a semiconductor optical modulator of this invention, each quantum-well layer and each barrier layer of a quantum-well structure serving as a light absorption layer are respectively made of In1-X-YGaXAlYN (0<=X, Y<=1, 0<=X+Y<=1) AND IN1-X'-Y'GaX'AlY'N (0<=X', Y'<=1, 0<=X'+Y'<=1). An electric field is being generated in the light absorption layer by spontaneous polarization.

A distance measuring device includes a light source emitting light, and an integrated electro-optic modulator arranged such that the emitted light passes through an optical waveguide of the electro-optic modulator in a first direction before being emitted from the distance measuring device, and after being reflected from a target passes through the electro-optic modulator in a second direction which is opposite to the first direction. The forward electro-optic response of a modulating region of the electro-optic modulator is the same as the backward electro-optic response, and a center of gravity of the modulation is independent of modulation frequency.

The invention relates to a symmetric quadrupole structure non-isolating support filed emission displayer with a bus electrode as the symmetric center. The displayer comprises an upper substrate and a lower substrate and is characterized in that the upper substrate is provided with lengthwise anodic electrodes and a pectination dielectric layer consisting of a transverse connecting strip and a plurality of lengthwise working strips; the lengthwise center of each anodic electrode is provided with the bus electrode; the upper edge of each anodic electrode is lengthwise and alternatively providedwith a fluorophor layer and an anodic separating dielectric layer; two lengthwise sides of each lengthwise working strip are respectively provided with a grid electrode so as to form an interdigitated counter electrode structure with the bus electrode as the symmetric center; the lower substrate is provided with transverse cathodic electrodes and lengthwise auxiliary electrodes; the upper edge ofeach cathodic electrode is transversely and alternatively provided with a current-limited resistance layer and a cathodic protective dielectric layer; the intersecting part of each auxiliary electrode and each cathodic electrode is isolated by the cathodic protective dielectric layer; and an isolating dielectric layer is arranged between the upper substrate and the lower substrate. The filed emission displayer not only has novel structure and simple process, but also has uniform images and low modulating voltage and is stable and reliable in electron emission.

The invention relates to diplopore polarized optical fiber phase modulator manufacturing method. It includes the following steps: inserting one end of the diplopore polarize optical fiber into the injector needle port and sealing, injecting hydrofluoric acid into the optical fiber micro-pore, enlarging the micro-pore to the need size by corrosion; putting the optical fiber into protective sleeve, exposing the need part, putting into hydrofluoric acid to corrode and gain two edge boring interlinked with the micro-pore; inserting tungsten filament into the micro-pore as electrode; adding high pressure to process heat polarizing. The produced diplopore polarized optical fiber phase modulator includes fiber core, optical fiber cladding, two micro-pores, and tungsten filament. There is one air gap between the tungsten filament and the optical fiber cladding. The method is convenient, has low cost. The phase modulator adopts full optical fiber structure which has low modulating voltage and little insertion loss.

The present invention relates to a quantum coder with phase modulated polarization state, decoder and polarization compensating method used in the quantum secret communication, four-state quantum coder and decoder are formed from a phase-polarization controller and a true random generator, and the six-state quantum coder and decoder are formed from two phase-polarization controllers and a synchronous trigger, in the quantum secret communication it utilizes the quantum coder and decoder to effectively compensate the polarization state distortion resulted in the course of signal transmission, so that its error code rate can be greatly reduced to 10 to the minus fifth, and its modulation speed can be up to several GHz from tens Hz.

The present invention relates to a quantum coder and decoder with phase modulated polarization state and their application method in the quantum secure communication. Four-state quantum coder or decoder is formed from a phase-polarization controller and a ture random generator, and can implement quantum secure communication using "two linear polarization states and two circular polarization states" four-state coded BB84 protocol; and six-state quantum coder or decoder is formed from two phase-polarization controllers and a synchronous trigger, and can implement six-state coded quantum secure communication.

The dielectric adjustable thin film based on the implanted nanowire electrode disclosed by the present invention has a titanium silicide conductive thin film layer, a titanium silicide conductive nanowire layer and a dielectric thin film layer sequentially deposited on the substrate from bottom to top. The thin film can be prepared by magnetron sputtering deposition method or sol-gel method. The dielectric adjustable film based on the implanted nanowire electrode of the present invention implants titanium silicide conductive nanowires into the dielectric film, makes full use of the huge fringe electric field of the nanowire electrode, and can obtain very high dielectric strength at an extremely low modulation voltage. The tunability is much lower than the modulation voltage of the dielectric tunable film without nanowire electrodes, which is only 1 / 6 to 1 / 10 of the normal situation. The dielectric adjustable film based on the implanted nanowire electrode of the invention has good compactness, few defects and low loss. The dielectric film implanted with titanium silicide conductive nano-electrodes is a high-performance dielectric tunable film with high tunability and low loss, and has a good application prospect.

The invention discloses a long-period waveguide grating and a waveguide preparation method, an optical modulator and an optical modulation method. The long-period waveguide grating comprises a lithium niobate substrate (5), a cladding slab waveguide (4), a buffer layer (2), and a coplanar waveguide electrode structure. The buffer layer (2) covers the upper surface of the cladding slab waveguide (4), and the lithium niobate substrate (5) covers the lower surface of the cladding slab waveguide (4). The coplanar waveguide electrode structure includes a signal electrode (6) and ground electrodes (7, 8). The signal electrode (6) covers the middle of the upper surface of the buffer layer (2). A core layer waveguide (3) is arranged in the middle of the upper surface of the cladding slab waveguide (4) and right below the signal electrode (6). The ground electrodes (7, 8) are located on the two sides of the signal electrode (6), and are in the same plane as the signal electrode (6). In addition, the invention discloses an optical modulator of the long-period waveguide grating based on periodic domain structure lithium niobate and an optical modulation method thereof. The long-period waveguide grating has the advantages of low modulation voltage, high modulation bandwidth, easy modulation, and the like.

The invention discloses a double-heterojunction PIN electro-optical modulator structure. The structure comprises an N-Sub-type substrate. A SiO2 buried layer is arranged at the upper portion of the N-Sub-type substrate. A P+ trap region and an N+ trap region are arranged on the two sides of the upper portion of the SiO2 buried layer respectively, and an intrinsic N-type germanium-silicon modulation region is arranged between the P+ trap region and the N+ trap region. A first electrode is arranged at the upper portion of the P+ trap region, a second electrode is arranged at the upper portion of the N+ trap region, and the upper portion of the first electrode, the upper portion of the intrinsic N-type germanium-silicon modulation region and the upper portion of the second electrode are covered with a SiO2 covering layer. The double-heterojunction PIN electro-optical modulator structure is a PIN electro-optical modulator high in carrier injection and low in modulating power consumption, and can replace a conventional silicon-substrate PIN electro-optical modulator structure; the smaller modulating power consumption can be obtained during electro-optical modulating, the photoelectric conversion efficiency is improved, the proportion of electricity elements in photoelectric integration is decreased, and convenience is brought to smaller-size development of photoelectric integration.

The invention relates to an atomic spin procession detecting method and an atomic spin precession detecting device based on electro-optic modulation. Alkali metal atoms in a spin-exchange relaxation free state are used for sensing an external magnetic field or angular rate, thereby generating atomic spin Larmor precession. An electro-optic modulator is used for performing electro-optic modulation on detected laser. Through output light strength detection by the electro-optic modulator and demodulation of a phase-locked amplifier, output light strength and frequency doubling signal strength are obtained. Finally a signal acquisition and processing circuit measures an atomic spin precession signal, and furthermore measurement to the external magnetic field or inertia can be realized. According to the atomic spin procession detecting method and the atomic spin procession detecting device, advantages such as simple modulation, small size, high sensitivity, low temperature effect and simple operation condition in the electro-optic modulator are exerted. The atomic spin procession detecting method and the atomic spin procession detecting device have relatively high sensitivity and relatively high stability. The novel atomic spin procession detecting method is based on an atomic spin effect and can be used for industrial integration and practical application of atomic spin sensing devices in future.

The invention discloses a resonant type fiber-optic gyroscope frequency locking device.The resonant type fiber-optic gyroscope frequency locking device comprises a light source driving module, a narrow linewidth laser source, a Y waveguide modulator, a first modulation module, a polarization maintaining optical fiber resonant cavity, a signal demodulation detection module, a second modulation module, a digital output module and a lithium niobate straight waveguide modulator.A laser works at constant temperature and constant current and in a steady state, frequency stability is good, and frequency noise introduced by frequency modulation of the laser is effectively lowered.Different from a traditional PZT intra-cavity modulation method, no movable part is arranged in the cavity, the effective refractive index is modulated by modulating the magnitude and direction of an electric field applied to lithium niobate waveguides, equivalent cavity length modulation is achieved, and reliability is high.The modulation voltage is low, no redundish external driver is needed, the structure is simple, and the size and power consumption of a gyroscope are easily reduced.The lithium niobate waveguide modulator has a polarization function and achieves a polarization selection effect in the cavity, the intra-cavity polarization extinction ratio is increased, and noise relevant to polarization is effectively restrained.