Sumitomo Osaka Cement Co., Ltd.

Oki Electric Industry Co., Ltd.

Hitachi, Ltd.

Renesas Electronics Corporation

Kei Kato

Hideki Ichimei

Norikazu Miyazaki

Hiroshi Nagai

Toshio Kataoka

Cai Dong Wang

Yosuke Terakura

Yutaka Kobayashi

Masahiro Iwamura

Junichiro Ichikawa

Ryo Shimizu

Koichi Chida

Yuhiko Fujiwara

An object is to provide an optical device for which size reduction can be achieved, and for which an increase in manufacturing cost is suppressed. An optical device of the present invention is an optical device in which an optical component is accommodated inside a case, the optical device including an optical component fixing member OF on which the optical component is mounted, in which a side surface portion CS and a bottom surface portion CB of the case are joined, and the optical component fixing member OF abuts on the side surface portion CS and is joined to the bottom surface portion CB.

Optical device, optical modulation device and optical transmission device

An optical device includes a housing that accommodates at least an optical waveguide element, a main body portionof the housing having an opening portion OP on one surface and a lead pin PNfixed to a side surface adjacent to the one surface, and including a metal memberdisposed to surround the opening portion OP and a lid memberthat closes the opening portion OP and is joined to the metal member, in which end portions of the metal memberand the lid memberalong the side surface of the main body portionat which the lead pin PNis disposed are located on an inner side of the main body portionthan the side surface of the main body portion

Optical device and optical transmission apparatus using same

An optical modulator that suppresses poor welding between a case main body and a lid portion is provided. There is provided an optical modulator including: a case that is a rectangular parallelepiped and accommodates at least an optical waveguide element, in which the case includes a case main bodyin which one surface of the rectangular parallelepiped forms an opening portion, and a lid portionthat has a rectangular shape and that closes the opening portion, the lid portion includes a peripheral part that has a thin thickness, and a protruding partthat is formed on the lid portion excluding the peripheral part and that protrudes toward an inside of the case, and when the lid portion is fitted into the case main body, a distance between an inner peripheral side of an end surface forming the opening portion of the case main body and an outer edge of the protruding part is set such that a distance dformed on a short-side side of the lid portion is larger than a distance dformed on a long-side side of the lid portion.

Optical modulator and optical transmission device using same

An optical waveguide device includes a substrate on which an optical waveguide is formed, and a reinforcing block disposed on the substrate, along an end surface of the substrate on which an input portion or an output portion of the optical waveguide is disposed, in which an optical component that is joined to both the end surface of the substrate and an end surface of the reinforcing block is provided, a material used for a joining surface of the optical component and a material used for the substrate or the reinforcing block have at least different linear expansion coefficients of a direction parallel to the joining surface, and an area of the joining surface is set to be smaller than a maximum value of a total of areas of cross sections of the substrate and the reinforcing block parallel to the joining surface.

Optical waveguide device, and optical modulation device and optical transmission device using same

An optical waveguide device includes a substrate on which an optical waveguide is formed, and a reinforcing block disposed on the substrate, along an end surface of the substrate on which an input portion or an output portion of the optical waveguide is disposed, in which an optical component that is joined to both the end surface of the substrate and an end surface of the reinforcing block is provided, a material used for a joining surface of the optical component and a material used for the substrate or the reinforcing block have at least different linear expansion coefficients of a direction parallel to the joining surface, and an area of a joining portion of the optical component is set to be smaller than an area of the end surfaces including joining portions of the substrate and the reinforcing block.

An optical modulator capable of curbing deterioration of transmission properties due to deformation of a housing is provided. Provided is an optical modulator including a substrate () on which an optical waveguide () is formed and a housing () that accommodates the substrate, in which the optical waveguide includes mode conversion branching portions () which convert a mode of light waves propagating through the optical waveguide and branch the light waves, a mounting portion () protruding from a surface () inside the housing and holding the substrate is formed, and the substrate is fixed to the mounting portion in an arrangement in which a fixed end () between the substrate and the mounting portion is positioned outside a region including the mode conversion branching portions when the substrate is seen in a plan view.

Optical modulator

The objective of the present invention is to provide an optical modulator adapted for use with various modulating units and various modulation regions, and with which variability in optical losses is limited as far as possible. An optical modulator in which an optical waveguide and a control electrode for controlling an optical wave propagating through the optical waveguide are provided in a substrate, characterized in that: the optical waveguide is provided with a first branching portion which causes one input light beam to branch into two light beams; each of a first and a second modulating portion connected to two branched waveguides which branch at the first branching portion is provided with a structure in which one or more Mach-Zehnder type optical waveguides are combined; the control electrode comprises signal electrodes which apply modulated signals to the first and second modulating portions; input portions of all the signal electrodes are disposed on either the left or the right of the substrate relative to the direction in which the optical wave propagates; and in relation to output portions of the signal electrodes, the output portions of the signal electrodes led out from each modulating portion are disposed on the side on which the first or second modulating portions are disposed, relative to the direction in which the optical wave propagates.

Optical modulator with wirings of equal length

Provided is an optical modulator including: a relay substrate; a first transmission line that is provided on a flat surface of the relay substrate, and transmits an electrical signal along the flat surface; a second transmission line that is provided separately from the relay substrate, is electrically connected to the first transmission line, and transmits, to the first transmission line, the electrical signal that has been input from an outer side in a direction that is not included in the flat surface; a modulation unit that modulates an optical signal by using the electrical signal that is transmitted by the first transmission line and the second transmission line; and a shield that shields a radiation component of the electrical signal that is radiated from the second transmission line.

Optical modulator and optical switch

A slave server with an optimal response time with respect to a program can be selected from slave servers located near a client. A virtual-machine dynamic allocation system according to the present invention in which a master server dynamically allocates a virtual machine that is to execute a requested program to any one of slave servers, includes: a response-measurement-time-information measuring unit configured to measure response-time information about a period between transmission of a request signal from each slave server to each of programs operating in the master server and reception of a response signal from each program in the master server; a response-time-information storage unit configured to store the measured response-time information of each program for each slave server; and a slave-server determining unit configured to refer to the response-time-information storage unit so as to determine a slave server that is to execute the requested program.

Virtual-machine dynamic allocation system and server

Provided is an optical modulator module in which a modulation substrate having a plurality of optical modulation units is stored inside a package case. The optical modulator module includes a plurality of signal supply lines configured to supply a modulation signal to the optical modulation unit through a connector terminal which is introduced into the package case. At least two or more of the plurality of signal supply lines are set such that the signal supply lines have overall electrical lengths which are different from each other. A particular part of the signal supply line employs at least one of the following configurations (a) and (b):

Optical modulator module

When a user wishes to play purchased content data by a playing terminal, a registration database server authenticates a user ID. Furthermore, when the playing terminal requests a content server to establish communication, the content server authenticates the playing terminal to thereby establish communication only with the playing terminal of which the user ID authentication and terminal authentication are correct. Consequently, the content data is prevented from being copied to another playing terminal which is owned by a third party, and thus the copyright of the content data can be protected.

Content playing system for reliably determining an authentication of a playing terminal

In a semiconductor integrated circuit device having a volatile memory high-speed operation is enabled and the density of the memory can be enhanced. The volatile memory includes a word line, a complementary bit line having bit lines, a plurality of common source lines, and a memory cell that is coupled with the word line and the complementary bit lines. The memory cell includes transistors. The gate electrodes of the transistors are coupled with the word line, and the drain electrode of one of the transistors is coupled with one of the bit lines. The drain electrode of the other transistor is coupled with the other bit line. The respective source electrodes of the transistors are coupled with any one of the common source lines, or brought in a floating state, thereby storing storage information in the memory cell.

ROM semiconductor integrated circuit device having a plurality of common source lines

This invention provides an improved data transferring method performed in a communication network comprising a management system Mand a plurality of nodes K-K. Since the management system Mcollectively manages the algorithm information that indicates algorithm possessed in each node, if the fist node does not have algorithm needed for processing a certain packet, the first node can find the second node having the algorithm by inquiring the network management element M. In addition, the first node can transfer the certain packet to the second node to process the certain packet by using the algorithm.

Network management method and communications network system

This invention provides an improved data transferring method performed in a communication network comprising a management system Mand a plurality of nodes K&#x2013;K. Since the management system Mcollectively manages the algorithm information that indicates algorithm possessed in each node, if the fist node does not have algorithm needed for processing a certain packet, the first node can find the second node having the algorithm by inquiring the network management element M. In addition, the first node can transfer the certain packet to the second node to process the certain packet by using the algorithm.

A network management system is provided which is capable of reducing a load of processing to be performed by each of nodes when information about a path on a network in each of nodes is acquired. The network management system includes a first edge node serving as an entrance unit to a communication network, second edge node serving as an exit unit, relay node mounted between both the edge nodes and path information acquiring unit to send out a tracing signal used to trace a transfer signal along a transfer route to the first edge node and to obtain information about a path for the transfer signal. Each node is made up of a path information holding unit, tracing signal residing unit, and tracing signal sending unit. The path information acquiring unit acquires the information about the path on a transfer route from one node out of a plurality of nodes.

Growing community of inventors

Tokyo, Japan

Kei Kato