Nippon Telegraph and Telephone Corporation

Ntt Electronics Corporation

Yoshiyuki Doi

Hiroshi Yamazaki

Takashi Yamada

Ken Tsuzuki

Takashi Goh

Toshishige Shimamura

Yuzo Ishii

Takaharu Ohyama

Shinji Mino

Motohaya Ishii

Ikuo Ogawa

Hiroshi Terui

Yoshifumi Muramoto

Yuichi Okabe

Akimasa Kaneko

Fumihiro Ebisawa

Tomoyo Shibazaki

Atsushi Murasawa

Yuichi Kikuchi

Takao Fukumitsu

Hiroshi Takahashi

Yuichi Suzuki

Takashi Saida

Masayuki Itoh

Manabu Oguma

Yohei Sakamaki

Naoki Ooba

Kazunori Seno

Yasuaki Tamura

Rena Nakatsuji

Hitoshi Okikawa

Nobutomo Yoshihashi

A cable connection management system of the present disclosure includes: an network orchestrator configured to obtain port ID information from an network device, the network device including a port to which a connector-attached cable is connected, the port ID information being on a port of the port to which the connector-attached cable is connected; an apparatus configured to obtain connector ID information on the connector-attached cable connected to the network device to transmit the connector ID information to a cable connection management server when the connector-attached cable is connected to the network device; and the cable connection management server configured to associate and store the connector ID information on the connector-attached cable and the port ID information.

Cable connection management system and cable connection management method

A tactile sensation presentation device includes a light source that emits a laser beam toward a test site that is a region of a skin surface of a biological object and a control device that generates a control signal that controls the light source and causes the light source to emit the laser beam in a modulated manner. The laser beam emitted from the light source in a manner modulated in accordance with the control signal from the control device whereby the test site is irradiated is absorbed at the test site and generates a pressure wave that is a thermoelastic wave by the photoacoustic phenomenon.

Tactile presentation device, and tactile presentation method

A nametag transmitter is a nametag transmitter that is to be attached to smartwear including an electrode for detecting biological information, the nametag transmitter including: a reception unit for receiving the biological information from the electrode; a wireless communication unit for transmitting the biological information to a data collection apparatus; a display unit for displaying identification information for specifying a user of the smartwear; and a connection portion to be attached to the smartwear. The nametag transmitter is attached to the smartwear in a state in which pairing between the wireless communication unit and the data collection apparatus has been carried out.

Name tag transmitter, smartware management system, and smartware management method

A multiplexer/demultiplexer that functions as an extremely small AWG optical filter in order to prepare a miniaturized and low-cost transceiver module necessary to realize a high speed transceiver for Ethernet (registered trademark). An optical multiplexer/demultiplexer includes: at least one input waveguide, a first slab waveguide, an arrayed waveguide group, a second slab waveguide, and at least one output waveguide. Each of the waveguides of the arrayed waveguide group has: a first bent part of which a waveguide extending direction changes 180 degrees or more; and a second bent part of which a waveguide extending direction changes 180 degrees or more in a direction opposite to a direction of the change of the first bent part.

Optical multiplexer/demultiplexer

In an optical component, a part of a waveguide type optical device is fixed to a convex portion of a mount. The optical component includes an optical device support base, a pressure member and a pressure support base. The optical device support base is interposed between the mount and the presser member enough to be slidable in a direction parallel to surfaces of the mount and the presser member.

Optical component

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&#xb0; 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.B). The bias electrode Bias 90&#xb0; provided in each child MZI constitute the entirety of a relative phase adjusting section. The optical signals are subjected to a phase change after the output from the child MZI (see FIG.A), because such relative phase adjusting section can subject the optical signals of the upper and lower arms of the child MZI to a shift change in the same direction, respectively.

Advanced-format optical modulator with low power consumption and low-loss characteristics

The present invention is intended to provide a compact and simple optical semiconductor device that reduces crosstalk (leakage current) between light receiving elements. According to the present invention, since a back surface electrode is a mirror-like thin film, crosstalk to an adjacent light receiving element can be suppressed, thereby reducing a detection error of a light intensity. By disposing a patterned back surface electrode or by disposing an ohmic electrode at the bottom of an insulating film over the whole back surface, contact resistance on the back surface can be reduced. By using the optical semiconductor elements with a two-dimensional arrangement and by using a mirror-like thin film as the back surface electrode, crosstalk can be reduced. By accommodating the optical semiconductor elements in the housing in a highly hermetic condition, the optical semiconductor elements can be protected from an external environment.

Optical semiconductor device

In an optical component configured to fix to a mount an optical device chip in which waveguide type optical devices having different thermal expansion coefficients are butt-jointed, deterioration in reliability due to thermal stress is suppressed. The optical component () comprises an optical device chip () including an LN waveguide (), a first PLC waveguide (), a second PLC waveguide (), and a fiber alignment member (), a mount (), and optical fibers (). Each of connection faces between the first PLC waveguide and the fiber alignment member is configured as an tilted structure, and each of connection faces between the LN waveguide, and the first and second PLC waveguides is configured as a right-angled structure. In the right-angled structure, the connection faces are connected by an adhesive having a lower Young's modulus than that of an adhesive used on the connection faces of the tilted structure.

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&#xd7;2 RZ pulse carver wherein optical phase shifters used for modulation are arranged along two arm waveguides held between a 1&#xd7;2 coupler and a 2&#xd7;2 coupler, two interferometric modulators connected respectively to two output ports of the 2&#xd7;2 coupler, and a 2&#xd7;1 coupler for combining the outputs of the interferometric modulators.

Optical modulator

An optical module has a structure for reducing the stress applied to a package. The optical module is structured so that an end face of a waveguide () of a planar lightwave circuit () is joined to a plurality of packages () storing therein optical elements so that the waveguide is optically coupled to the optical elements. The optical module includes a housing () storing therein a planar lightwave circuit and a plurality of packages in which an upper face of a protrusion () formed in the bottom section is fixed to the planar lightwave circuit (). Each of the plurality of packages () is electrically connected to an electric part () provided in the housing () via flexible printed circuits ().

Optical module

An optical modulator having a high stability is provided. In the optical modulator according to the present invention, a phase modulation by an electro-optic effect is made on an optical substrate of an electro-optic material while the setting of an operating point by a thermal-optic effect is made on a planar lightwave circuit (PLC) substrate of quartz, silicon, or the like. Such configuration can suppress the influence of thermal drift or the like because no heat is applied directly to the optical substrate of the electro-optic material. In addition, breakage and warpage of the substrate due to heat are also mitigated. Further, quartz used for the PLC has a low thermal conductivity, approximately one-fifth of that of the LN substrate (approximately 1 W/(m&#xb7;K)), and therefore, a desired phase difference can be maintained with a low power consumption, and thus, the operating point becomes stabilized.

Growing community of inventors

Atsugi, Japan

Yoshiyuki Doi