Nec Corporation

Hirose Electric Company, Ltd.

Mitsubishi Gas Chemical Company, Inc.

Resonac Corporation

Shohei Yamaguchi

Katsuya Tomizawa

Seiji Watanabe

Tomoyuki Kaneko

Eisuke Shiga

Meguru Ito

Masahiko Osaka

Hidetoshi Inoue

Hiroshi Sakuyama

Tomoki Hamajima

Yuma Takeuchi

Hidetoshi Kawai

Kazumasa Takeuchi

Norihiro Shida

A branching device to be used for branching a power supply path connecting a first trunk station and a second trunk station to a branch station, the branching device including: a first power reception port being connected with a first power supply path connected to the first trunk station; a second power reception port being connected with a second power supply path connected to the second trunk station; a third power reception port being connected with a third power supply path connected to the branch station; and a power supply unit configured to supply, via the third power reception port, power to the third power supply path by power supply from at least either of the first power supply path and the second power supply path.

Branching device, optical submarine cable system, and power supply method

To be able to check, from a remote location, a switching result of a power supply route, this communication system comprises: a plurality of terminal stations which each have a function of supplying power to a power supply path; a branching device which switches the power supply route, which includes a power supply path; and a monitoring device which, in response to one of the plurality of terminal stations transmitting to the branching device a switching signal specifying the power supply route, compares the voltages of the power supplied to the power supply paths respectively observed by the plurality of terminal stations, before and after transmission of the switching signal, and which, with the compared power supply voltages each having fluctuated by a first threshold or more, determines a switching result of the power supply route in the branching device.

Communication system

To generate, in an optical transmission device, a response signal corresponding to executed control even when said optical transmission device does not comprise one or both of a main signal photoelectric conversion function and a main signal optical amplification function, an optical transmission device comprises: an extraction unit that outputs, from a first optical signal including a main signal and a control signal, a signal including control information included in the control signal; a control unit that executes control on the basis of the control information; and a response signal output unit that outputs, according to the control, a response signal in a wavelength band different from the main signal.

Optical transmission device and optical transmission method

A resin composition for a printed wiring board, including: a phenolic compound (A); a maleimide compound (B); an epoxy compound (C); a cyclic carbodiimide compound (D); an inorganic filler (E); and a curing accelerator (F), wherein a content of the inorganic filler (E) is 100 to 250 parts by mass based on 100 parts by mass of a resin solid content.

Resin composition for printed wiring board, prepreg, laminate, metal foil-clad laminate, printed wiring board, and multilayer printed wiring board

A flat conductor electric connector mounted on a circuit board and electrically connected to a front end side portion of a band-shaped flat conductor extending in a front-back direction, comprising: multiple terminals in such a shape that metal plate members are bent in a plate thickness direction thereof; and a housing holding, by insert molding, the multiple terminals arrayed in a terminal array direction which is a band width direction, wherein each of the multiple terminals has, at least at one end portion in the front-back direction, a holding target portion held on the housing and an extending portion extending from the housing and formed with a mounting portion to be mounted on the circuit board by soldering, and the holding target portions adjacent to each other and the extending portions adjacent to each other are arrayed and positioned in the terminal array direction. The mounting portion includes an opening to receive a pin of a molding device.

Electric connector for flat conductor

The present invention is provided with: a first contact in a first relay connected to a circuit to be grounded; a resistor which is connected between the first contact and the earth, and which suppresses the flow of electric current to the first contact when the first contact is closed; a second contact in a second relay connected in parallel to the resistor; and an interlocking control means which inhibits opening of the first contact in a closed state when the second contact is opened, and which inhibits closing of the first contact in an open state when the second contact is closed.

Grounding circuit, electrical apparatus, grounding control method, and grounding control program

It is intended to provide a resin composition that suppresses the thermal expansion of a printed circuit board more than ever and also prevents the bleedout of substances from the printed circuit board, while maintaining a high glass transition temperature. The resin composition of the present invention contains an alkenyl-substituted nadimide, a maleimide compound, and an epoxy-modified cyclic silicone compound.

Resin composition, prepreg, resin sheet, metal foil-clad laminate, and printed circuit board

A terminal, wherein, the lower and upper arms have a plurality of integral lower flexible arms and integral upper flexible arms respectively, which include at least a first lower and upper flexible arm and a second lower and upper flexible arm that are elastically displaceable independently of each other, the lower striking portions each have a first and second lower striking portion formed on a first and second lower flexible arm respectively, the second lower striking portion at a position that is offset in the longitudinal direction with respect to the first lower striking portion, and the upper striking portions each have a first and second upper striking portion formed on a first and second upper flexible arm respectively, the second upper striking portion at a position that is offset in the longitudinal direction with respect to the first upper striking portion.

Electrical connector for flat conductor

[Problem] To suppress current flowing to a contact of a relay when grounding a device to be grounded by connecting the contact of the relay, and to suppress arc discharge between relay contacts when the grounding state of the device to be grounded is released by disconnecting the relay contact. [Solution] A grounding circuit equipped with: a first relay contact connected to a device to be grounded; a resistor that is connected between the first relay contact and an earth, and that suppresses current flowing to the first relay contact when the contact of the first relay is closed; and a second relay contact that is connected in parallel with the resistor, and that is closed before the first relay contact is opened when the grounding state of the device to be grounded is released.

Grounding circuit, electrical device, grounding control method, and grounding control program

Provided is a feedline branching apparatus that makes it possible for additional submarine cables to be installed easily, and with which cost increases can be restricted. For these purposes, the feedline branching apparatus comprises a branching unit and an earth unit. First, second and third terminal stations are connected to the branching unit via first, second and third cables, respectively. When the first and second cables are normal, the branching unit connects a feedline of the first cable to a feedline of the second cable, thereby forming a feedline using a first current. If one of the first and second cables is faulty, the branching unit grounds the feedline of the one of the first and second cables, while connecting the feedline of the other cable to the earth unit. The earth unit grounds a feedline of the third cable, thereby forming a feedline using a second current. When the feedline of the other cable is connected to the earth unit from the branching unit, the earth unit grounds the feedline of the other cable, thereby forming a feedline using the first current.

Feed line branching apparatus and feed line branching method

In order to prevent, without significantly reducing the power of a transmission path, a signal unnecessary for a branch station from being intercepted at the branch station, a node apparatus comprises: a first optical unit that outputs a first optical signal received from a first terminal station and addressed to a second terminal station and also outputs a second optical signal received from the first terminal station and addressed to a third terminal station; and a second optical unit that receives the first and second optical signals outputted from the first optical unit, optically removes a portion of the spectrum of the first optical signal, thereby generating a fourth optical signal, and passes the second optical signal as it is, thereby transmitting the second optical signal together with the fourth optical signal to the third terminal station.

Node apparatus and node apparatus control method

A terminal, wherein the lower and upper arms have a plurality of integral lower flexible arms and integral upper flexible arms respectively, which include at least a first lower and upper flexible arm and a second lower and upper flexible arm that are elastically displaceable independently of each other, the lower striking portions each have a first and second lower striking portion formed on a first and second lower flexible arm respectively, the second lower striking portion at a position that is offset in the longitudinal direction with respect to the first lower striking portion, and the upper striking portions each have a first and second upper striking portion formed on a first and second upper flexible arm respectively, the second upper striking portion at a position that is offset in the longitudinal direction with respect to the first upper striking portion.

A repeater according to the present invention includes a plurality of excitation light sources with varying center wavelengths for use as an excitation light source to achieve Raman amplification; and comprises a flatness monitoring circuit which monitors the flatness of signal light on a transmission line; a monitor control circuit which controls externally said excitation light sources based on a remote supervisory control signal and which determines which of said excitation light sources to control as appropriate according to the flatness of signal light identified by said flatness monitoring circuit; and a bandwidth selective reflector or LD modules which, under the control of said monitor control circuit, outputs said flatness information to another repeater as a remote supervisory control signal with a specific wavelength, via said transmission line.

Raman amplification repeater

An optical repeater includes: a first forward pumping coupler and a first backward pumping coupler inserted in an uplink optical fiber consecutively along the transfer direction of the optical signals therein; a second backward pumping coupler and a second forward pumping coupler inserted in a downlink optical fiber consecutively along the transfer direction of the optical signals therein; a first light source for supplying a pump light having a controlled power level to the first backward pumping coupler and the second forward pumping coupler; a second light source for supplying a pump light having a controlled power level to the first forward pumping coupler and the second backward pumping coupler. Each of the pumping couplers is a Raman amplifier.

Optical repeater having independently controllable amplification factors

A polarization scrambler unit includes a plurality of polarization scramblers, a switching unit for coupling one of the polarization scramblers to a transmission line fiber, a detection unit for detecting an output signal from the polarization scrambler coupled to the transmission line fiber, and a controlling unit for switching, via the switching unit, between the polarization scramblers and another polarization scrambler whenever a false output signal is detected by the detection unit. Thus, the polarization scrambler unit has a redundant structure.

Growing community of inventors

Tokyo, Japan

Shohei Yamaguchi