The Nippon Telegraph and Telephone Corporation , commonly known as NTT, is a Japanese telecommunications company headquartered in Tokyo, Japan. Ranked 29th in Fortune Global 500, NTT is the largest telecommunications company in the world in terms of revenue.The company is incorporated pursuant to the NTT Law . The purpose of the company defined by the Law is to own all the shares issued by Nippon Telegraph and Telephone East Corporation and Nippon Telegraph and Telephone West Corporation and to ensure proper and stable provision of telecommunications services all over Japan including remote rural areas by these companies as well as to conduct research relating to the telecommunications technologies that will form the foundation for telecommunications.While NTT is listed on Tokyo, Osaka, New York, and London stock exchanges, the Japanese government still owns roughly one-third of NTT's shares, regulated by the NTT Law. Wikipedia.
Notomi M.,Nippon Telegraph and Telephone
Reports on Progress in Physics | Year: 2010
Recently, strongly modulated photonic crystals, fabricated by the state-of-the-art semiconductor nanofabrication process, have realized various novel optical properties. This paper describes the way in which they differ from other optical media, and clarifies what they can do. In particular, three important issues are considered: light confinement, frequency dispersion and spatial dispersion. First, I describe the latest status and impact of ultra-strong light confinement in a wavelength-cubic volume achieved in photonic crystals. Second, the extreme reduction in the speed of light is reported, which was achieved as a result of frequency dispersion management. Third, strange negative refraction in photonic crystals is introduced, which results from their unique spatial dispersion, and it is clarified how this leads to perfect imaging. The last two sections are devoted to applications of these novel properties. First, I report the fact that strong light confinement and huge light-matter interaction enhancement make strongly modulated photonic crystals promising for on-chip all-optical processing, and present several examples including all-optical switches/memories and optical logics. As a second application, it is shown that the strong light confinement and slow light in strongly modulated photonic crystals enable the adiabatic tuning of light, which leads to various novel ways of controlling light, such as adiabatic frequency conversion, efficient optomechanics systems, photon memories and photons pinning. © 2010 IOP Publishing Ltd. Source
Fujitsu Limited, Nippon Telegraph and Telephone | Date: 2015-11-18
A connector includes a fixed contact, a movable contact that contacts with the fixed contact, a slide, a contact slide operated in association with a movement of the slide, a button that is pushed in accordance with the movement of the slide, the button including a lower portion, an upper portion, and a slant portion connecting the lower portion to an upper stage, and a card that moves the movable contact toward and away from the fixed contact in accordance with the movement of the button, wherein the contact slide contacts with the lower portion when the switch is in a turn-off state, contacts with the slant portion so as to push the button and cause the card to move the movable contact toward the fixed contact when the slide slides in one direction, and contacts with the upper portion when the switch is in a turn-on state.
NTT Advanced Technology Corporation, Nippon Telegraph and Telephone | Date: 2015-03-09
An optical connector cleaning tool includes a cylindrical connecting portion to which an optical connector is connected, a cleaning unit configured to guide a cleaning thread to a coupling end face of an optical connector plug, and an optical unit having an optical path reaching the optical connector plug. The optical unit includes a lens arranged in a position facing the coupling end face to form one end portion of an optical system, and having a missing portion extending in an optical-axis direction, and an image sensor positioned at the other end of the optical system. The cleaning unit includes a rod-like cleaning tip having a thread passage through which the cleaning thread passes. The cleaning tip is inserted into a hollow portion of the lens having the missing portion extending in the optical-axis direction, such that the cleaning tip is movable in a longitudinal direction thereof.
Nippon Telegraph and Telephone | Date: 2014-07-17
This radio communication method is used to perform spatial multiplexing communication between cells in the overlap cell environment. In the MU-MIMO overlap cell environment, when a null is formed between a radio base station and a radio terminal station belonging to different cells, a first set of a call signal and a response signal is used to perform mutual detection with the radio base station and the radio terminal station belonging to different cells, and then a null is formed so as not to cause interference of radio waves between the radio base station and the radio terminal station belonging to different cells. At this time, the addresses of the radio base station and the radio terminal station are used to discriminate whether the radio base station and the radio terminal station belong to the same cell or different cells.
Nippon Telegraph and Telephone | Date: 2014-04-07
The image encoding apparatus encodes while predicting an image between different views using a reference image encoded for a view different from a processing target image, and a reference depth map for an object of the reference image when a multiview image of plural different views is encoded. A view-synthesized image is generated for the entire encoding target image using the reference image and the reference depth map. A setting section sets whether to perform prediction for each of encoding target blocks into which the encoding target image is divided, or to perform prediction using the view-synthesized image for the entire encoding target image. Information is encoded to indicate the prediction unit. An encoding section performs predictive encoding on the encoding target image for every encoding target block, while selecting a predicted image generation method when the prediction for every encoding target block as the prediction unit has been selected.