Patent application number | Description | Published |
20100181508 | SAFETY VALVE DRIVE SYSTEM - A safety valve drive system is operated such that a safety valve of a nuclear power plant is opened by supplying a driving gas by using a pilot valve at an occurrence of an accident or a transient state to thereby protect a reactor against pressure application. The safety valve drive system is provided with a safety valve drive unit, as a function of actuating the safety valve, and cables. The safety valve drive unit actuates in a manner that the safety valve is opened in response to respective auto-depressurization system actuating signals for two or more segments among respective auto-depressurization system actuating signals for four segments, and is closed if an auto-depressurization system actuating signal for one or less segment among the auto-depressurization system actuating signals for the four segments is received. The cables are connected to the safety valve drive unit and used to transfer the auto-depressurization system actuating signals for the four segments. | 07-22-2010 |
20110041419 | CONSTRUCTION OF NUCLEAR POWER PLANT BUILDING AND CONSTRUCTION METHOD THEREOF - A nuclear power plant building includes a building body portion and a roof covering over the building body portion. The building body portion is formed in a rectangular shape in plane cross section by four outer walls. The roof is of a shell construction. In addition, corner walls each to bridge between the adjacent outer walls or to bridge between the roof and the outer wall are provided at angle portions of the body portion of the building. | 02-24-2011 |
20120063716 | Wideband Interferometer Type Polarized Light Combiner and Splitter - A interferometer type polarization beam combiner and splitter, which can combine or split polarized light over a wide band, is provided. The interferometer type polarization beam combiner and splitter includes: an optical splitter; an optical coupler; an optical path length difference imparting unit, which includes a plurality of optical waveguides arranged between the optical splitting unit and the optical coupling unit; one or two input/output ports connected to the optical splitter; and two input/output ports connected to the optical coupler. A half-integer of a wavelength of λc is set as a normalized phase difference, for the optical path length difference imparting unit, between two polarization states, and means for generating a difference in refractive index dispersion is provided between the optical waveguides of the optical path length difference imparting unit, so that the change rate of the transmittance with respect to wavelength is suppressed for the two polarization states. | 03-15-2012 |
20120106888 | OPTICAL MODULATOR - In a nest MZI modulator in which each arm includes a child MZI, the power consumption is reduced. The hybrid integrated-type nest MZI modulator of the embodiment 1a is configured so that, instead of placing a relative phase adjusting section in a parent MZI, a bias electrode Bias 90° in which an electric field is applied in the same direction to the polarization direction in both of the upper and lower arms is placed in each child MZI (see FIG. | 05-03-2012 |
Patent application number | Description | Published |
20100320854 | MOTOR - A motor includes a tubular housing having flat side walls along each side of rectangular joined with each other by joining sections, a magnet, having magnet poles in the jointing section, disposed along the inner peripheral surfaces of the housing, a shaft inserted along the axis of the housing, an armature fixed to the shaft in such a position as to be opposite to the magnet, a commutator mounted on the shaft, a carbon brush in sliding contact with the outer peripheral surface of the commutator, and electrical components provided within the housing. The electrical components in the longer direction are arranged nonparallely with all the sides of the housing. | 12-23-2010 |
20130258695 | AUTOMOTIVE HEADLAMP - An automotive headlamp includes: a light source; a movable shade configured to be movable between a first position shielding a part of light emitted from the light source and a second position having a different light shielding volume; a motor configured to generate a driving force to move the shade from the first position to the second position; and a stopper for high beam to fix the movable shade, which has been moved from the first position to the second position, at the second position. The motor is configured such that a motor phase is lag when the motor moves the movable shade to the second position by the driving force generated by supplied power and fixes the same, and an electric current is applied to the motor when the movable shade is fixed at the second position. | 10-03-2013 |
Patent application number | Description | Published |
20100271913 | INFORMATION PROCESSOR, OPTICAL DISC FAILURE ANALYSIS METHOD, AND COMPUTER PRODUCT - According to one embodiment, an information processor includes an optical disc drive, an acquiring module, a storage module, and a determination module. The acquiring module acquires identification information that uniquely identifies an optical disc loaded in the optical disc drive based on information read from the optical disc. The storage module obtains information related to failure analysis of the optical disc contained in state information indicating reading state or writing state upon reading from or writing to the optical disc, and stores the information related to failure analysis in association with the identification information. The determination module calculates values each indicating a level of failure of the optical disc based on pieces of information related to failure analysis of the optical disc stored until just recently in association with the identification information and, when the values satisfy a predetermined condition, determines that there is a risk of failure in the optical disc. | 10-28-2010 |
20120084730 | ELECTRONIC APPARATUS, ICON DISPLAY METHOD, AND PROGRAM FOR ELECTRONIC APPARATUS - According to one embodiment, there is provided an electronic apparatus, including: a display screen on which icons are displayed; a first icon display area within the display screen, the first icon display area displaying plural icons having approximately the same size so as to be arranged approximately in a one-dimensional direction while avoiding an overlap between the icons; and a second icon display area continuous with the first icon display area in the one-dimensional direction within the display screen, the second icon display area displaying plural icons so as to be decreased in size as it goes away from the first icon display area while allowing an overlap between the icons. | 04-05-2012 |
Patent application number | Description | Published |
20090172478 | Information Processing Apparatus, Backup Device and Information Processing Method - According to an aspect of the present invention, there is provided an information processing apparatus including: a connector to which a backup device is connected; a data storing unit that stores an objective data; and a processor that is configured: to write the objective data to the backup device as a backup data; to record a change log that specifies an updated part of the objective data; to detect a difference part between the objective data and the backup data when the backup device is connected to the connector; to determine whether the difference part matches the updated part specified by the change log; and if the difference part does not match the updated part, to identify a mismatching part between the difference part and the updated part as an abnormal data. | 07-02-2009 |
20100246351 | INFORMATION PROCESSING APPARATUS AND FAULT SYMPTOM DETERMINATION METHOD - According to one embodiment, an information processing apparatus includes an optical disc drive, a measuring module in the optical disc drive, and a measurement value reception module. The measuring module is configured to measure a value related to an operation of a predetermined motor in the optical disc drive, which is executed during a time period of power-up of the optical disc drive. The measurement value reception module is configured to receive a measurement value related to the operation of the predetermined motor from the optical disc drive in response to an event of being requested to turn off the power of the optical disc drive, and to store the received measurement value in a storage device. | 09-30-2010 |
20100268863 | INFORMATION PROCESSING APPARATUS - According to one embodiment, if a nonvolatile memory which stores format information of an HDD, a CD/DVD, an FDD and a USB storage device, and the USB storage device are connected, the drive letter of the USB storage device is virtually assigned as FDD or HDD on the basis of the format information. | 10-21-2010 |
20100271919 | INFORMATION PROCESSOR, FAILURE PREDICTION METHOD, AND COMPUTER PRODUCT - According to one embodiment, an information processor includes an optical disc drive, a recorder, and a determination module. The optical disc drive includes a loading mechanism that loads and ejects an optical disc. The recorder obtains state information indicating the operating state of the loading mechanism to record the state information. The determination module determines that, when a value related to failure prediction of the loading mechanism satisfies a predetermined condition, there is a risk of failure in the loading mechanism. The value is calculated from a combination of a plurality of indices contained in the state information. | 10-28-2010 |
Patent application number | Description | Published |
20100003005 | DATA PROCESSING DEVICE, DATA PROCESSING METHOD, DATA PROCESSING PROGRAM AND RECORDING MEDIUM INCLUDING PROGRAM RECORDED THEREIN - An editing device selects, among the video of the video data, a scene such as a backlit scene and a camera shake scene which has a characteristic different from a necessary scene, as an unnecessary scene, and reproduces the selected unnecessary scene on a display unit. Accordingly, the editing device allows the user to select necessary scenes and unnecessary scene from among the camera shake scenes or the backlit scenes. In addition, for example, if a camera shake scene is present in similar videos that are captured at substantially identical locations, the user can recognize that the camera scene is present without conducting an operation to select the camera shake scene. | 01-07-2010 |
20100214422 | Recording Apparatus, Reproducing Apparatus, Recording Method, Recording Program, and Computer-Readable Recording Medium - In a recording apparatus, a high-speed camera continuously shoots a series of images at a high shutter speed. Next, an MV calculating unit calculates motion vectors, based on a sequential relationship of the series of images shot by the high-speed camera. Then, a recorder records the images shot by the high-speed camera, together with the motion vectors corresponding to the images. On the other hand, in a reproducing apparatus, the series of images recorded by the recorder are reproduced, with the motion vectors recorded by the recording apparatus added thereto. | 08-26-2010 |
Patent application number | Description | Published |
20090322188 | SMALL-SIZED MOTOR - The present invention is used with a stopper mechanism for mechanically stopping the rotation of a motor. A pair of brushes is disposed such that a line which passes through the center of a rotor and connects the centers of the paired brushes is offset by a predetermined angle from a line which connects the centers of paired magnets. A commutator is disposed in such a manner as to be offset from a reference position by the same angle as the predetermined angle by which the paired brushes are offset. The predetermined angle falls within a range between an angle obtained by dividing 70° by the number of pairs of stator poles and an angle obtained by dividing 290° by the number of pairs of stator poles. Specifically, in the case of two stator poles, the predetermined angle falls within a range of 70° to 290° inclusive. In the case of four stator poles, the predetermined angle falls within a range of 35° to 145° inclusive. | 12-31-2009 |
20100156203 | SMALL MOTOR OF POLYGONAL EXTERNAL SHAPE - A side wall of a motor casing is formed into a polygonal shape such that flat side portions and corner portions located at respective corners between the side portions are continuously joined together. A field magnet, which has an outer circumferential shape approximately coinciding with the inner circumferential shape of the motor casing, has magnet side portions and magnet corner portions, and has a rib provided on outer circumferential surfaces of the magnet side portions. The magnet is disposed, through press-fitting, within the motor casing such that at least the rib comes into contact with the inner circumferential surface of the motor casing, wherein the magnet side portions, excluding the rib, are formed such that small clearances are formed between the magnet side portions and the side portions of the motor casing, or at least such that no pressing force acts on the magnet side portions, excluding the rib. | 06-24-2010 |
Patent application number | Description | Published |
20100021328 | SCROLL COMPRESSOR - In a scroll compressor, a center of a turning scroll body is shifted with respect to a drive central axis so that a distance between a gravity center and the drive central axis in a turning scroll becomes smaller than a predetermined allowable value set based on theoretical displacement and mass of the turning scroll. A moment force about the drive central axis acting on the turning scroll is reduced during revolving, and an alternating force acting on an autorotation preventing pin in the turning scroll is reduced to an allowable level. | 01-28-2010 |
20100068086 | SCROLL FLUID MACHINE - Provided is a scroll fluid machine that, by using a crankshaft manufactured by cold forging and a needle bearing, can sufficiently exhibit the performance of a variable circling radius mechanism, can provide a sufficient reliability on a bearing portion of the crankshaft, and can be manufactured inexpensively. For this purpose, in a crankshaft | 03-18-2010 |
20100119397 | FLUID MACHINE - Intended is to provide a fluid machine that can prevent wear of a rotation preventing pin. The fluid machine includes a housing, a fixed scroll fixed with respect to the housing, a turning scroll that revolves around the fixed scroll, and a rotation preventing mechanism that prevents the rotation of the turning scroll. The rotation preventing mechanism includes a rotation preventing pin projected from a wall surface at the housing side or the turning scroll side, and a restraining member that restricts the position of the rotation preventing pin by engaging with the rotation preventing pin. A projecting side end of the rotation preventing pin has a taper shape, and the end of the taper shape has an R-shape | 05-13-2010 |
20110194966 | SCROLL COMPRESSOR - A scroll compressor includes a housing; a fixed scroll fixed in the housing; an orbiting scroll that has an orbiting end plate on which a spiral orbiting wall is provided upright and that is supported in the housing so as to be able to orbit while being prevented from rotating, in a state where the orbiting wall is engaged with the fixed wall; a suction section that makes refrigerant containing lubricant flow into a suction chamber provided in the housing; and a plurality of supply flow paths that are provided on a sliding surface between the housing and the orbiting end plate and that are connected to the suction chamber. | 08-11-2011 |
20110200475 | SCROLL COMPRESSOR - An object is to provide a scroll compressor capable of preventing degradation in performance and the occurrence of abnormal noise due to a torsional moment applied to an orbiting scroll, by utilizing the structural advantages of so-called stepped scroll compressors. In a so-called stepped scroll compressor ( | 08-18-2011 |
Patent application number | Description | Published |
20090190883 | OCT PROBE - An OCT probe has a sheath to be inserted into a subject; and an optical system within the sheath, for changing the direction of light which propagates from a light source through an optical fiber to irradiate the light onto the subject through a transparent portion of the sheath, and for reflecting the light beam, which is reflected by the subject, to guide the light into the optical fiber. A light output surface, for causing the light to be output from the reflecting surface in a direction obliquely inclined with respect to the inner surface of the sheath, and a reflected light sheath entrance preventing portion, for preventing light reflected by the inner surface of the sheath from entering the optical fiber, are provided in the optical system. The reflected light sheath entrance preventing portion may be formed by providing a cut planar surface portion on the lens. | 07-30-2009 |
20150065884 | ULTRASONIC ENDOSCOPIC PROBE - Provided is an ultrasonic endoscopic probe capable of obtaining an ultrasonic observation image having high spatial resolution. A part of a substantially tubular catheter is sealed with seal plates to provide a cavity housing: a motor including a motor casing, a rotor magnet, a bearing, and a rotating shaft; an ultrasonic transducer mounted to the rotating shaft; and a signal transmission means. The bearing includes an inner peripheral surface provided with a plurality of dynamic pressure generating grooves. An acoustic coupling fluid is sealed in the cavity and is allowed to penetrate a gap between the bearing and the rotating shaft at all times. When the ultrasonic transducer and the motor are rotated in the acoustic coupling fluid, the acoustic coupling fluid is suctioned in a preferable manner into the bearing gap having the dynamic pressure generating grooves for lubrication. Thus, a lack of an oil film on the bearing can be prevented, allowing for high accuracy rotation. Operational failure due to the development of foam in the acoustic coupling fluid can be prevented, enabling the acquisition of a high resolution ultrasonic observation image. | 03-05-2015 |
Patent application number | Description | Published |
20090154962 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device visualizing an electrostatic latent image previously formed on the surface of an image carrier as toner image, comprising: a developing roller placed at a position facing the image carrier, carrying a toner on the surface thereof, conveying the toner and flying the conveyed toner onto the surface of the image carrier; and a resin layer coated on the surface of the developing roller, wherein the absolute value of the difference in charge between the toners in the upper and lower layers of the toner layer formed on the developing roller as the toner carried on the developing roller is 6 μC/g or less. | 06-18-2009 |
20130315629 | DEVELOPER CONVEYING DEVICE, AND DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH SAME - A developer conveying device includes a housing, a developer conveyance path and a conveying member. The developer conveyance path extends between a pair of wall portions. The conveying member includes a spiral member, an inner wall portion and shaft portions. The spiral member is formed by connecting spiral pieces, each forming one spiral turn, in a conveying direction of the developer and includes a hollow interior formed by the connected spiral pieces. The inner wall portion includes a plurality of planar portions which define the hollow interior of the spiral member and are connected at predetermined angles in a circumferential direction of the rotation of the conveying member. The shaft portions are arranged at opposite end parts of the spiral member, rotatably supported on the wall portions and serve as a rotary shaft for the rotation of the conveying member. | 11-28-2013 |
20130315630 | DEVELOPER CONVEYING DEVICE, AND DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH SAME - A developer conveying device includes a housing, a developer conveyance path and a conveying member. The developer conveyance path extends between the pair of wall portions of the housing. The conveying member conveys developer from one wall portion toward the other. The conveying member includes a spiral member, shaft portions, a rib member, a supporting member and a projecting portion. The spiral member is formed by connecting spiral pieces in a conveying direction of the developer and includes a hollow interior formed by the connected spiral pieces. The rib member extends in the conveying direction and bridges adjacent ones of the spiral pieces of the spiral member. The supporting member connects an end part of the rib member in the conveying direction and the shaft portion. The projecting portion projects from the end part of the rib member more toward the wall portion than the supporting member. | 11-28-2013 |
20130315631 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH SAME - A developing device includes a developing roller, a developer supply path, a developer conveyance path, a supply-side conveying member and an agitating-side conveying member. The developing roller is rotatably supported in the housing. The developer supply path is arranged along the developing roller. The developer conveyance path is arranged along the developer supply path. The supply-side conveying member is a conveying member arranged in the developer supply path and includes a first receiving portion arranged to face the communication path at an upstream side in the first direction and configured to receive the developer from the developer conveyance path, and has a hollow spiral shape at a side downstream of the first receiving portion. The agitating-side conveying member is a conveying member arranged in the developer conveyance path and includes a first transferring portion arranged to face the first receiving portion at a downstream side in the second direction. | 11-28-2013 |
20130315632 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS PROVIDED WITH SAME - A developing device includes a housing, a developing roller, a developer supply path, a developer conveyance path, a supply-side conveying member, an agitating side conveying member and first projection members. The developing roller is rotatably supported in the housing. The supply-side conveying member includes a supply-side spiral member formed by connecting spiral pieces, in the first direction and having a hollow interior formed by the connected spiral pieces and a first rib member extending in the first direction, is arranged in the developer supply path and conveys the developer in the first direction by being driven and rotated. The first projecting members extend in the first direction along an outer wall portion of the first rib member from a first area where the supply-side spiral member and the first rib member intersect and project radially outward in the rotation of the supply-side conveying member. | 11-28-2013 |
Patent application number | Description | Published |
20120138348 | PHOTOSENSITIVE CONDUCTIVE FILM, METHOD FOR FORMING CONDUCTIVE FILM, METHOD FOR FORMING CONDUCTIVE PATTERN, AND CONDUCTIVE FILM SUBSTRATE - A photosensitive conductive film | 06-07-2012 |
20140124253 | PHOTOSENSITIVE CONDUCTIVE FILM, METHOD FOR FORMING CONDUCTIVE FILM, METHOD FOR FORMING CONDUCTIVE PATTERN, AND CONDUCTIVE FILM SUBSTRATE - A photosensitive conductive film | 05-08-2014 |
20140327889 | CONDUCTIVE PATTERN FORMATION METHOD, CONDUCTIVE PATTERN-BEARING SUBSTRATE, AND TOUCH PANEL SENSOR - A conductive pattern formation method of the present invention includes a first exposure step of radiating active light in a patterned manner to a photosensitive layer including a photosensitive resin layer provided on a substrate and a conductive film provided on a surface of the photosensitive resin layer on a side opposite to the substrate; a second exposure step of radiating active light, in the presence of oxygen, to some or all of the portions of the photosensitive layer not exposed at least in the first exposure step; and a development step of developing the photosensitive layer to form a conductive pattern following the second exposure step. | 11-06-2014 |
20140335350 | METHOD FOR FORMING PROTECTIVE FILM ON ELECTRODE FOR TOUCH PANEL, PHOTOSENSITIVE RESIN COMPOSITION AND PHOTOSENSITIVE ELEMENT, AND METHOD FOR MANUFACTURING TOUCH PANEL - The method for forming a protective coat on an electrode for a touch panel according to the invention comprises a first step in which a photosensitive layer comprising a photosensitive resin composition containing a binder polymer, a photopolymerizable compound and a photopolymerization initiator is provided on a base material having an electrode for a touch panel, a second step in which prescribed sections of the photosensitive layer are cured by irradiation with active light rays, and a third step in which the sections other than the prescribed sections of the photosensitive layer are removed to form a protective coat comprising the cured sections of the photosensitive layer covering all or a portion of the electrode, wherein the hydroxyl value of the photosensitive resin composition is no greater than 40 mgKOH/g. | 11-13-2014 |
20140363767 | METHOD FOR FORMING RESIN CURED FILM PATTERN, PHOTOSENSITIVE RESIN COMPOSITION, PHOTOSENSITIVE ELEMENT, METHOD FOR PRODUCING TOUCH PANEL, AND RESIN CURED FILM - The method for forming a resin cured film pattern according to the invention comprises a first step in which there is formed on a base material a photosensitive layer composed of a photosensitive resin composition comprising a binder polymer with a carboxyl group having an acid value of 75 mgKOH/g or greater, a photopolymerizable compound and a photopolymerization initiator, and having a thickness of 10 μm or smaller, a second step in which prescribed sections of the photosensitive layer are cured by irradiation with active light rays, and a third step in which the sections of the photosensitive layer other than the prescribed sections are removed to form a cured film pattern of the prescribed sections of the photosensitive layer, wherein the photosensitive resin composition comprises an oxime ester compound and/or a phosphine oxide compound as the photopolymerization initiator. | 12-11-2014 |
20140377704 | METHOD OF FORMING PROTECTIVE FILM FOR TOUCH PANEL ELECTRODE, PHOTOSENSITIVE RESIN COMPOSITION AND PHOTOSENSITIVE ELEMENT, AND METHOD OF MANUFACTURING TOUCH PANEL - In the method for forming a protective coat on an electrode for a touch panel according to the invention, a photosensitive layer comprising a photosensitive resin composition containing a binder polymer having a carboxyl group and an acid value of 30 to 120 mgKOH/g, a photopolymerizable compound having at least three ethylenic unsaturated groups, and a photopolymerization initiator, is formed on a base material having an electrode for a touch panel, prescribed sections of the photosensitive layer are cured by irradiation with active light rays and then the sections other than the prescribed sections are removed, to form a protective coat comprising the cured sections of the photosensitive resin composition covering all or a portion of the electrode. | 12-25-2014 |
Patent application number | Description | Published |
20120200729 | IMAGE DISPLAY CONTROLLER CAPABLE OF PROVIDING EXCELLENT VISIBILITY OF DISPLAY AREA FRAMES, IMAGE PICKUP APPARATUS, METHOD OF CONTROLLING THE IMAGE PICKUP APPARATUS, AND STORAGE MEDIUM - An image display controller capable of providing excellent visibility of a face display frame and a human display frame associated with an object. The image display controller detects an object in an image, and identifies a face area of the object distinguishably from a human body area exclusive of the face area. Further, the image display controller generates a face display frame for enclosing the face area and a human body display frame for enclosing the human body area. Then, the image display controller displays the face display frame and the human body display frame on a screen together with the image. | 08-09-2012 |
20140043523 | IMAGE PICKUP APPARATUS AND METHOD FOR CONTROLLING THE SAME - A shift amount between a plurality of image signals that is obtained from pixels in each of which a plurality of photoelectric conversion units are provided is computed from an amount of correlation based on a difference value between the plurality of image signals. Also, if the difference value that is used for computing the amount of correlation is not less than a predetermined upper limit, a predetermined value that is not more than the upper limit is used as the difference value. | 02-13-2014 |
20140240542 | IMAGE CAPTURING APPARATUS AND METHOD FOR CONTROLLING THE SAME - In an image capturing apparatus, a generation unit performs image processing to generate a synchronizing signal for an image sensor, an image generation unit generates image data using an electric signal obtained from the image sensor, and a display control unit reads out the image data stored in a storage unit and displays it on a display unit. The generation unit controls a phase of the synchronizing signal such that the display processing starts when the image processing for a predetermined volume of image data is finished if a frame period (first period) of the image sensor is shorter than a frame period (second period) of the display control unit, and that a predetermined volume of unprocessed image data is left in the storage unit when the image processing for one frame is finished if the first period is not shorter than the second period. | 08-28-2014 |
Patent application number | Description | Published |
20130011093 | OPTICAL MODULATOR - Disclosed is an optical modulator which substantially lowers loss and has little attenuation in the intensity of an optical signal after modulation. The optical modulator includes a 1×2 RZ pulse carver wherein optical phase shifters used for modulation are arranged along two arm waveguides held between a 1×2 coupler and a 2×2 coupler, two interferometric modulators connected respectively to two output ports of the 2×2 coupler, and a 2×1 coupler for combining the outputs of the interferometric modulators. | 01-10-2013 |
20130136393 | OPTICAL COMPONENT - In an optical component configured to fix to a mount an optical device chip in which a plurality of waveguide type optical devices having different thermal expansion coefficients are butt-jointed, deterioration in reliability due to thermal stress is suppressed. The optical component ( | 05-30-2013 |
20130315524 | OPTICAL FREQUENCY SHIFTER AND OPTICAL MODULATOR USING THE SAME - An object of the present invention is to provide a temperature-independent optical frequency shifter for generating sub-carriers with a miniaturizable configuration, as well as to provide an all-optical OFDM modulator using the same that is compact, has low temperature dependence, and is even compatible with different frequency grids. Provided is an optical frequency shifter and an optical modulator using the same, the optical frequency shifter comprises one input optical port, a 1-input, 2-output optical coupler optically connected thereto, two Mach-Zehnder modulation units individually optically connected to the two outputs thereof, a 2-input, 2-output optical coupler optically connected to the individual outputs thereof, and two output optical ports optically connected to the outputs thereof, wherein the two Mach-Zehnder modulation units are driven by periodic waveforms at the same frequency whose phases differ from each other by (2p+1) π/2 (p: integer). | 11-28-2013 |
20130322809 | OPTICAL MODULATOR - An optical modulator that supports a plurality of modulation formats is provided. The optical modulator includes: a distribution part including an optical demultiplexing/variable-branching switchable circuit; an optical modulator array; and an aggregation part including a combining ratio variable combining circuit and/or an optical multiplexing/variable-combining switchable circuit. The distribution part forms any or a combination of a variable 1×M demultiplexer/brancher, a combination of one or more fixed ILFs and an optical switch and a combination of a plurality of variable optical couplers and an optical switch; the optical modulator array includes a plurality of optical modulators; the aggregation part includes a structure of any or a combination of one or more variable optical couplers, a combination of a plurality of variable attenuators, an M×1 variable coupler, a variable M×1 demultiplexer/brancher and a combination of one or more fixed ILFs and an optical switch. | 12-05-2013 |
20130322815 | WAVEGUIDE TYPE OPTICAL SWITCH - A waveguide type optical switch that can reduce the number of intersections in a matrix optical switch having the configuration of connecting unit optical switches and optical combining devices or optical branching devices to have a connecting function from “multiple inputs to one output” to “one input to multiple outputs”. To reduce the number of intersections in an entire matrix optical switch, an optical combining device of M inputs and one output is divided into (M−1) pieces of unit optical combining elements each having two inputs and one output, which are arranged immediately after (N−1) pieces of respective output ports excluding one piece of the output port closer to the input in the matrix optical switch out of N pieces of the output ports in the optical switch of one input and N outputs. | 12-05-2013 |
20140314366 | OPTICAL MODULATOR - An optical modulator comprises an input optical splitting unit for bifurcating input light; a final optical coupling unit for coupling optical signals in a polarization state orthogonal to each other; an intermediate optical coupling unit provided in an intermediate position between the input optical splitting unit and the final optical coupling unit; first and second optical paths for connecting the input optical splitting unit and the intermediate optical coupling unit, optical path lengths of the first and second optical paths are approximately equal; third and fourth optical paths for connecting the intermediate optical coupling unit and the final optical coupling unit, optical path lengths of third and fourth optical paths are approximately equal; and three binary phase modulation unit arranged one by one in each of the three optical paths of the first, second, third and fourth optical paths. | 10-23-2014 |