460 results about "Electro-optic effect" patented technology

An active photonic crystal device for controlling an optical signal is disclosed. The device includes a planar photonic crystal with a defect waveguide bounded on the top and bottom by an upper cladding region and a lower cladding region. An optical signal propagating in the defect waveguide is confined in the plane of the photonic crystal by the photonic bandgap, and in the direction normal to the photonic crystal by the upper clad region and the lower clad region. The propagation of the optical signal in the defect waveguide is controlled by varying the optical properties at least one of the upper clad region or the lower clad region. The variation of the optical properties of the controllable regions may be achieved using a thermo-optic effect, an electro-optic effect, a stress-optic effect, or a mechano-optic effect, or by moving a material into or out of the controllable region.

The invention discloses a composite single crystal thin film and a method for manufacturing the composite single crystal thin film. The composite single crystal thin film comprises a substrate, an optical isolation layer, a lithium niobate single crystal thin film or a lithium tantalate single crystal thin film and a silicon thin film, wherein the optical isolation layer is located on a substrate; the lithium niobate single crystal thin film or the lithium tantalate single crystal thin film is located on the optical isolation layer; and the silicon thin film is located on the lithium niobate single crystal thin film or the lithium tantalate single crystal thin film. The composite single crystal thin film disclosed by the invention has good nonlinear optical effect, acousto-optical effect, electro-optic effect and the like of a lithium niobate or lithium tantalite material, and simultaneously has the characteristic of a mature processing technology of a silicon material, so that the composite single crystal thin film disclosed by the invention can achieve relatively good compatibility with an existing IC production technology and has a broad industrial prospect. In addition, stable and effective industrial production can be achieved according to the method for manufacturing the composite single crystal thin film disclosed by the invention.

This disclosure relates to a display panel and a display device, said display panel comprising an array substrate, a color film substrate and a first liquid crystal layer disposed between the array substrate and the color film substrate, said display panel further comprising an electro-optic effect layer and an electrode layer disposed on one side or on both sides of the electro-optic effect layer; said electrode layer is used to generate an electric field in said electro-optic effect layer; said electro-optic effect layer is disposed on an outer side of the array substrate or on an outer side of the color film substrate, for causing birefringence of light rays to occur under the effect of said electric field when they pass through said electro-optic effect layer. Said display panel is capable of flexibly adjusting the color gamut displayed by the display panel within a larger range and has a lower cost.

An object of the invention is to provide a Mach-Zehnder type optical modulator that can reduce wavelength chirp occurring in a modulated light, and also can reduce an optical loss with a small sized configuration. To this end, according to the present Mach-Zehnder type optical modulator, in a configuration where optical waveguides and a coplanar electrode are formed on a substrate having an electro-optical effect, a polarization inversed region is formed in a part of an interaction portion of the substrate, and a signal electrode is arranged above one of parallel waveguides in a polarization inversed region and is arranged above the other parallel waveguide in a non-inversed region. Furthermore, a surface area of the substrate positioned on both sides of each of the parallel waveguides is lowered to provide a ridge structure section, and a buffer layer is formed on a ridge side face thereof.

It is an object to provide an optical control device capable of realizing speed matching between a microwave and a light wave or impedance matching of microwaves and of reducing a driving voltage. An optical control device including a thin plate 1 (11) which has an electro-optical effect and has a thickness of 10 μm or less, an optical waveguide 2 formed in the thin plate, and control electrodes for controlling light passing through the optical waveguide is characterized in that the control electrodes are configured to include a first electrode and a second electrode disposed to interpose the thin plate therebetween, the first electrode has a coplanar type electrode including at least a signal electrode 4 and a ground electrode 5, and the second electrode has at least a ground electrode 54 (55, 56) and is configured to apply an electric field to the optical waveguide in cooperation with the signal electrode of the first electrode.

There is provided a high performance optical waveguide type optical modulator with excellent long term reliability, in which contamination of the buffer layer in a forming process of a signal field adjustment region on the buffer layer by a lift-off method or an etching method, is prevented and DC drift thus suppressed. The optical waveguide type optical modulator 10 comprises a substrate 11 having an electro-optic effect, optical waveguides 12 formed on the surface of this substrate 11, a traveling-wave type signal electrode 13a and ground electrodes 13b which are provided on the substrate 11 and control a lightwave, and a buffer layer 14 provided between the electrodes 13 and the optical waveguides 12, and furthermore, a dielectric layer 15 is provided on the entire surface of the buffer layer 14 on the side of the electrodes 13, and a signal field adjustment region 16 which has a wider width than that of the traveling-wave type signal electrode 13a and is made of a material with a higher refractive index than that of the dielectric layer 15 is formed between the dielectric layer 15 and the traveling-wave type signal electrode 13a.

An optical modulator restricted in a photorefractive phenomenon caused by a stray light in an optical modulator, and improved in the quenching ratio characteristics of a signal light. The optical modulator comprises a substrate consisting of a material having an electro-optic effect, an optical waveguide formed on the substrate, and a modulating electrode for allowing an electric field to work on the optical waveguide and changing the phase of light passing through the optical waveguide, characterized in that stray light removing means are provided on the surface of the substrate.

A waveguide type polarizing beam splitter belongs to the technical field of integrated photon devices, is based on the total internal reflection principle and the mode field coupling principle and adopts liquid crystal materials with a large double refraction difference. According to the invention, optical signals of different polarization states can automatically select specific branch waveguides at branch positions to transmit so as to realize effective separation of the optical signals of different polarization states; the refractivity of the liquid crystals at a regulation and control area can be changed through utilizing an electro-optical effect so as to achieve the purpose that the output ports of the optical signals of different polarization states exchange and further realize regulation and control of a polarized light output passage. The polarizing beam splitter provided by the invention has the advantages of simple structure, easiness in design and manufacturing, low wave length dependence, simplicity and convenience in regulation and control, and the like, and has an application prospect in an integrated photon system.

An electrooptic device having a simple structure that can efficiently increase deflection of a beam is provided. The device includes: an electrooptic crystal (11) having an electrooptic effect; an electrode pair of a positive electrode (12) and a negative electrode (13) for generating an electric field inside the electrooptic crystal; and a power source for applying a voltage between the electrode pair so as to generate a space charge inside the electrooptic crystal. With this arrangement, by using a simple structure, a change in a deflection angle is temporally rapid, and a large deflection angle that can not be obtained by a conventional electrooptic crystal prism can be acquired at a low applied voltage.

Disclosed herein is a display device including: a first substrate with a pixel switch and drivers mounted thereon; a second substrate disposed in facing relation to the first substrate; a material layer held between the first substrate and the second substrate and having peripheral edges sealed by a seal member, the material layer having an electrooptical effect; and a semiconductor chip mounted as a COG component on the first substrate, the semiconductor chip having a control system configured to control the drivers; wherein the semiconductor chip having a thickness equal to the total thickness of the seal member and the second substrate or larger than the thickness of the seal member and smaller than the total thickness.

The invention is a fiber-optical electric-field sensor namely a photoelectric measuring device, based on electrooptic effecct to measure electric field, including collimation lens, polarizer, lambda/4 wave piece, electrooptic crystal, polarization detector and coupler lens in order placed in light path. Each optical cell is inserted on organic glass basic body with the flute matching the shape and order of the optical cells, and the optical cells are felted one another and the cells and the glass are also felted by optical glue. The link and test of light-path system is convenient.

The present invention provides a highly-integrated and compact optical element and further provides an optical element having various functions such as lower driving voltage, chirping suppression and polarization-independency.

The optical element comprising a substrate 1 consisting of a material having an electrooptic effect, top optical waveguides 2-1 an 2-2 formed on the top face of said substrate, bottom optical waveguides formed on the bottom face of said substrate, a top modulating electrode for controlling the phase of a light wave being propagated through said top optical waveguide, and a bottom modulating electrode for controlling the phase of a light wave being propagated through said bottom optical waveguide, is characterized in that at least one side edge of said substrate comprises output and input of said optical waveguides formed on said top and bottom faces, and a turnback element is located adjacent to said one side edge to guide the light wave from said output to said input.

The invention discloses an atomic magnetometer detection light frequency measuring and stabilizing device and method based on second harmonic. According t the method, based on the optical absorption effect and dispersion effect of an alkali metal atom gas chamber for detection laser and optical effects (such as an electro-optic effect, a magneto-optical effect, and a photoelastic effect) of a phase modulator, through monitoring a second harmonic signal outputted by an atomic magnetometer optical detection system, the detection light frequency is calculated in real time, with a servo controller and a closed-loop control algorithm, a control signal is fed to a detection light source control module to carry out corresponding adjustment, and the frequency online measurement of large detuning detection light and long time closed loop stability are realized. According to the device and the method, the advantages of system simplification, a small size, application range enlargement, real-time measurement and feedback are developed, the improvement of the sensitivity and stability of a miniaturized and integrated atomic magnetic field measurement device is facilitated, and the device and the method can be used for the industrial integration and practical application of a quantum sensing instrument such as an atomic magnetometer in the future.

“This invention offer optical modulator module with fulfilling the effective and the stable optical modulation, which stabilizes the emission of semiconductor and control the shift of optic axis between the optical component by the temperature change and so on, when using the semiconductor laser. Peculiarly, the optical modulator module includes, in same package, the semiconductor laser (27) as light source, the optical modulation device (28) that has optical waveguide on the surface of the chip made by the element of the electro-optical effect, and the polarization rotating element (40) between said semiconductor laser and said optical modulation device, for bringing plane of polarization of light from said semiconductor laser (27) to optimum plane of polarization in waveguide of the said optical modulation device in line and blocking the returning light from said optical modulation device to said semiconductor laser.”

The invention provides an optical switching method capable of using the electronic control quadratic electro-optical effect for deflecting incident light, belongs to the technical field of optics, and aims to solve the problem in the existing optical switching technology that a broadband range and quick responses cannot be realized. The optical switching method specifically comprises the following steps: a quadratic electro-optical effect potassium tantalate niobate crystal is used; when laser radiation is needed, an external electric field is not applied to the crystal, and lasers directly penetrate through the crystal; when laser radiation is not needed, the external electric field is applied to the crystal in the two directions perpendicular to the incident lasers, and the quadratic electro-optical effect is used for making polarized components in the incident lasers be polarized sequentially after the polarized components pass through the crystal, wherein the polarization direction of the polarized components is parallel to the direction of the externally applied electric field; finally, the polarized components deviate from the original propagation direction, and the purpose of switching on and off is achieved. An optical switch manufactured by the adoption of the optical switching method has the advantages of being small in size, low in cost, easy to process, and high in response speed (at a nanosecond level), so that the application prospect of the optical switch is quite broad.

An optical modulator according to the present invention includes an optical waveguide 2a to 2d made of a material with an electro-optic effect and a modulating electrode 3 for applying a modulating electric signal to light propagating through the optical waveguide 2a to 2d. The modulator further includes a periodic structure, of which the equivalent refractive index changes periodically in a light propagation direction and which can reduce the group velocity of the light propagating through the optical waveguide 2a, 2b.