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| Number | Title | Issue Date |
| 7710311 | Short range radar small in size and low in power consumption and controlling method thereof A transmitter section radiates a short range wave to a space. A receiver section has a detector circuit composed of a branch circuit which receives a reflection wave of the short range wave radiated to the space by means of the transmitter section and branches in ph... | 05/04/2010 |
| 7574311 | Time interval measuring apparatus and jitter measuring apparatus using the same In order to stably measure an input interval time of a pulse signal with high precision, a time interval measuring apparatus includes a reference signal generator, a phase shifter, first and second A/D converters, an error correction unit, an instantaneous phase cal... | 08/11/2009 |
| 7522004 | High-frequency electronic switch, and burst wave generating device using the same and short range radar using the same A high-frequency electronic switch includes a signal input terminal to which a high-frequency signal to be switched is input, a plurality of amplifying circuits with transistors, to respectively amplify the high-frequency signal to be switched sequentially, the ampl... | 04/21/2009 |
| 7483470 | Semiconductor laser capable of coupling with single mode optical fiber at high coupling efficiency A semiconductor laser includes a substrate made of InP, an active layer including a multiquantum well structure, which is formed in a width of 7 to 14 μm on the substrate, and an n-type cladding layer made of InGaAsP and a p-type cladding layer made of InP, which a... | 01/27/2009 |
| 7474812 | Monitor photodetector equipped optical modulator An optical modulator has, on a substrate having electro-optic effect, an optical waveguide including an input optical waveguide, two branching optical waveguides which branch a light beam incident to the input optical waveguide into two beams, two interaction optica... | 01/06/2009 |
| 7440414 | Communication relay device with redundancy function for line in network in accordance with WAN environment and communication system using the same A communication relay device with a redundancy function for a line in a network under a WAN environment is connected to another, having a one-to-one relationship at both ends of each line by first and second ports to configure a redundancy channel between lines. A c... | 10/21/2008 |
| 7424037 | OTU frame data generating apparatus and method in which multiframe structured data to be inserted into overhead portion can be easily edited An overhead data generating unit stores and generates the non-multiframe structured data and the multiframe structured data to be inserted into the overhead portion of an OTU frame. The overhead data generating unit includes a memory which stores the multiframe stru... | 09/09/2008 |
| 7420503 | Small-sized low-power dissipation short-range radar that can arbitrarily change delay time between transmission and reception with high time resolution and method of controlling the same In a configuration according to a short-range radar of the present invention and a method of controlling the same, the timing at which a variable-period pulse output from a variable-period pulse generator including a direct digital synthesizer (DDS) has shifted in l... | 09/02/2008 |
| 7372123 | Semiconductor light-receiving module capable of converting light into current efficiently at light absorbing layer A semiconductor light-receiving module includes a semiconductor light-receiving element and an incident light direction device. The semiconductor light-receiving element includes a substrate, at least a light absorbing layer and an upper cladding layer formed sequen... | 05/13/2008 |
| 7339888 | Bridge and route change method of network using the same A plurality of bridges are interconnected between respective ports thereof in a ring shape to configure a network containing a redundant route. When a bridge has a blocking port, the bridge transmits to the network a blocking advertisement containing information ind... | 03/04/2008 |
| 7263355 | Test apparatus and method which can simultaneously execute various tests of one or a plurality of radio communication terminals of various types of communication systems A test apparatus main body mounted in a single housing has a connection unit, a common bus, terminal control units, measurement units, and a total control unit. The connection unit can connect at least two terminals of identical or different type of communication sy... | 08/28/2007 |
| 7248981 | Jitter measurement device and jitter measurement method An orthogonal signal generating unit converts a signal to be measured into two orthogonal signals which are two signals whose phases are orthogonal to one another. An instantaneous phase calculating unit calculates an instantaneous phase based on the two orthogonal ... | 07/24/2007 |
| 7245657 | Jitter resistance measuring instrument and method for enabling efficient measurement of jitter resistance characteristic and adequate evaluation A control section varies an amplitude of a modulation signal every time the control section conducts control to vary a combination of the frequency of a clock signal and the frequency of the modulation signal by controlling a clock signal generator and a modulation ... | 07/17/2007 |
| 7206339 | Wonder generator, digital line tester comprising the same, and phase noise transfer characteristic analyzer A wander generator has a random number signal generator unit, a filter unit, a clock generator unit, a modulator unit, and a setting unit. The random number generator unit sequentially generates random number signals comprised of a plurality of bits at a constant sp... | 04/17/2007 |
| 7190978 | Mobile network simulator apparatus A mobile network simulator section has a function as least one mobile network simulator which forms a communication line between a test terminal and a connection destination in response to a connection request and which disconnects the communication line in response... | 03/13/2007 |
| 7071524 | Semiconductor light receiving device for repeatedly propagating incident light in light absorption layer and method for manufacturing the same A lower cladding layer is laminated on a substrate and constituted of at least one layer. A light absorption layer is laminated on the lower cladding layer. An upper cladding layer is laminated above the light absorption layer and constituted of at least one layer. ... | 07/04/2006 |
| 7069005 | Method for analyzing signal and signal analyzer having function for displaying slot information A measuring section measures a digital multiplex signal divided into slot units, as a signal to be measured. A display control section displays, on a screen, a measured waveform of the signal. An analyzing section analyzes, in the slot units, information relating to... | 06/27/2006 |
| 7065123 | Distributed feedback semiconductor laser for outputting beam of single wavelength First and second diffraction grating layers are provided above a semiconductor substrate, and are spaced from each other in an output direction of a beam with a flat connecting layer sandwiched therebetween. An active layer is disposed above or below the first and s... | 06/20/2006 |
| 7062412 | Interactive demonstration method for a measuring instrument and system using a network A measuring instrument information providing server delivers to a user terminal via a network an operational program that contains demonstration information for enabling dynamic and interactive operation of a measuring instrument in response to a request for providi... | 06/13/2006 |
| 7035553 | Autocorrelation bit error detection device and method for optical signal by optical branching method To improve the performance for measuring autocorrelation bit errors of optical signals to be measured, an autocorrelation-bit-error detection apparatus of the present invention using an optical branch system first has an optical branch unit for branching an optical ... | 04/25/2006 |
| 6995724 | Waveguide slot type radiator having construction to facilitate manufacture A waveguide portion has a waveguide with a rectangular section surrounded by a pair of narrow side plates opposed to each other, a pair of broad side plates extending along lengthwise directions of the pair of narrow side plates. A radiation portion is provided on o... | 02/07/2006 |
| 6985449 | Apparatus and method for configuring spanning tree and spanning tree protocol system and bridge system An apparatus for configuring a spanning tree is used for a network in which a plurality of virtual LANs coexist. This apparatus for configuring the spanning tree has at least one bridge and a holding section. The above at least one bridge has a plurality of ports, a... | 01/10/2006 |
| 6972603 | Maximum time interval error test signal generating apparatus not affected by low-pass measuring filter An MTIE test signal generating apparatus generates a predetermined MTIE test signal. An MTIE measuring unit includes a low-pass measuring filter having a predetermined high-cut characteristic. A cycle-amplitude setting portion sets a cycle corresponding to an observ... | 12/06/2005 |
| 6936868 | Sequential mesa avalanche photodiode capable of realizing high sensitization and method of manufacturing the same A sequential mesa type avalanche photodiode (APD) includes a semiconductor substrate and a sequential mesa portion formed on the substrate. In the sequential mesa portion, a plurality of semiconductor layers, including a light absorbing layer and a multiplying layer... | 08/30/2005 |
| 6909496 | Method and device for easily and rapidly measuring nonlinear refractive index of optical fiber A transmitting section makes light, intensity-modulated by a modulating signal of a sine wave having a designated frequency, be incident on one end side of an optical fiber which is a measurement object. A feature value determining section converts the light, which ... | 06/21/2005 |
| 6907366 | Electronic measurement apparatus having a function to a display a function menu over a plurality of pages in a list and function menu display method A storage stores data of plural function menus corresponding to plural function menu items composed of plural pages to be used in instruction of execution of mutually different plural functions to process tested data of an object displayed in a first region on a scr... | 06/14/2005 |
| 6904099 | Digital modulation signal generator With respect to a digital modulation signal outputted from an output terminal, in order to enable desired carrier leak characteristics to be compatible with desired mutual modulation distortion characteristics according to a measurement object, a first level varying... | 06/07/2005 |
| 6891904 | Modulation signal analysis apparatus An analysis operation section uses a digital signal converted by an A/D converter, and performs frequency analysis for a modulation signal and modulation analysis for the modulation signal selected by a signal selection circuit in order to modulate/analyze a digital... | 05/10/2005 |
| 6891616 | Polarization analyzer using a plurality of Faraday rotators Faraday rotators each have a Faraday element which rotates light and a magnetic field generator for applying a magnetic field to the Faraday element. A wavelength plate is disposed between the Faraday rotators and it retards the light. A polarizer transmits, of the ... | 05/10/2005 |
| 6891982 | Optical modulation device having excellent electric characteristics by effectively restricting heat drift An optical waveguide for guided an incident light is formed on a substrate having an electro-optic effect. A first buffer layer is formed to cover an upper surface of the substrate. A conductive film is formed above the first buffer layer. A center electrode and a g... | 05/10/2005 |
| 6891808 | Spanning tree bridge and route change method using the same A controller changes a blocked port to a forwarding state when a link down or change of the representative bridge is detected and a receiving port of a bridge settled in the root bridge is a blocked port. When the bridge itself is not settled in a root bridge, a tra... | 05/10/2005 |
| 6888799 | SDH test apparatus and SDH test method A SDH test apparatus substitutes a part of payload of received SDH data with a desired data and transmits. A FIFO memory is installed between the Rx AU processor and the Tx AU processor, stores sequentially AU data extracted by the Rx AU processor and outputs to the... | 05/03/2005 |
| 6876450 | Laser absorption spectral diffraction type gas detector and method for gas detection using laser absorption spectral diffraction A laser absorption spectroscopy type gas detection device is provided in which a light source device emits a laser beam containing a light component having a wavelength corresponding to an absorption spectrum of gas to be detected. A concave mirror has a reflecting ... | 04/05/2005 |
| 6870618 | Wavelength characteristic measuring device and method using light having wavelength thereof continuously changed A wavelength variable light source emits a light whose wavelengths continuously change from a preset start wavelength up to a stop wavelength to a measuring object. A timing information output section generates timing information showing emission timings of lights e... | 03/22/2005 |
| 6862098 | Apparatus and method for measuring displacement Apparatus for measuring displacement that measures the displacement (the irregularities) of the surface of a measuring object precisely and at high speed is provided. The apparatus for measuring displacement scans light radiated toward the surface of the measuring o... | 03/01/2005 |
| 6854068 | Wander generator having arbitrary TDEV mask characteristic setting apparatus In a file, the TDEV mask data information including the TDEV mask data constituted by connecting a plurality of line segments and a calculation expression for forming the TDEV mask data, are stored in advance. A readout section reads out a predetermined TDEV mask da... | 02/08/2005 |
| 6839032 | Protable radio terminal testing apparatus using single self-complementary antenna A portable radio terminal testing apparatus has an antenna coupler 20, a connecting member 16, and a measuring device 15. The antenna coupler 20 has a placement member 35, a coupling antenna 25, a pair of through-connection ... | 01/04/2005 |
| 6834059 | SDH signal channel pointer analyzing apparatus and method A channel pointer extractor extracts channel pointer value inserted in a SDH signal based on the pointer position information contained in the channel information, each time the channel information is detected by a channel information detector. A reference data read... | 12/21/2004 |
| 6816708 | Measuring instrument with multiple signal terminals shared in multiple operation modes A housing 1 contains a plurality of signal processing units for performing signal processing corresponding to a plurality of operation modes. At a front surface 1a of the housing, an operation panel 3, a display, and a plurality of signal... | 11/09/2004 |
| 6792215 | Multiwavelength light source device employing annular optical delay circuit A multi-wavelength light source apparatus includes a tunable light source, optical intensity modulator, optical coupler, annular optical delay circuit, and optical gate device. The tunable light source successively changes and outputs a plurality of output lights di... | 09/14/2004 |
