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Feature Articles: Keynote Speeches at NTT R&D Forum 2011
 Satoshi Miura, President and CEO, NTT
Abstract
This article introduces NTT’s research and development (R&D) activities aimed at supporting widespread use of information and communications technology and its activities in pursuit of global business expansion. It is based on the keynote address given in Japanese by Satoshi Miura, President and Chief Executive Officer of NTT, at the NTT R&D Forum 2011, held on February 21–23, 2011.
- Hiromichi Shinohara, NTT Senior Vice President, Director of Research and Development Planning Department
Abstract
This article introduces NTT’s research and development (R&D) activities aimed at maintaining and developing information and communications technology (ICT) services and pursuing further innovation as a carrier R&D organization. It is based on a lecture given by Hiromichi Shinohara, NTT Senior Vice President, Director of Research and Development Planning Department, at the NTT R&D Forum 2011 held on February 21–23, 2011.
Feature Articles: New NTT Group Environmental Vision: Looking to 2020––THE GREEN VISION 2020
- New NTT Group Environmental Vision: Looking to 2020––THE GREEN VISION 2020
Abstract
In November 2010, the NTT Group formulated its new Environmental Vision, called THE GREEN VISION 2020. The Group identified three environmental themes: creating a low-carbon society, implementing closed-loop recycling, and conserving biodiversity. For each of these themes, we will drive those efforts through three approaches: Green of ICT, Green by ICT, and Green with Team NTT (ICT: information and communications technology).
- Green R&D Activities
Abstract
This article describes NTT’s green research and development for reducing the environmental impact of society by reducing the impact of information and communications technology (ICT) installations in telecommunication centers, datacenters, and customers’ offices and homes (Green of ICT) and by reducing the impact in other sectors by providing various kinds of ICT services (Green by ICT).
Regular Articles
- High-speed Low-power Digital-to-Analog Converter Using InP Heterojunction Bipolar Transistor Technology for Next-generation Optical Transmission Systems
Abstract
We have developed a high-speed low-power 6-bit digital-to-analog converter (DAC) for next-generation optical transmission systems. To achieve both high-speed and low-power performance, we used a simple R-2R ladder-based current-steering architecture and devised a new timing alignment technique. A DAC test chip was fabricated using our in-house InP-based heterojunction bipolar transistor (HBT) technology. It operates at a sampling rate of up to 28 giga-samples per second (GS/s) with low-power consumption of 0.95 W and achieves a better figure of merit (0.53 pJ per conversion step) than any other previously reported DAC with a sampling rate above 20 GS/s. It also provides a clear multilevel modulated signal and can be applied to post-100-Gbit/s/ch multilevel optical transmission systems.
- Flexible-format Optical Modulators with a Hybrid Configuration of Silica Planar Lightwave Circuits and LiNbO3 Phase Modulators
Abstract
We have devised and fabricated two types of flexible-format optical modulators that let us flexibly change the modulation format: a single-carrier modulator, which supports 4-, 8-, and 16-level modulations, and a multicarrier modulator, which provides a selectable combination of the number of frequency carriers and modulation levels. Both were fabricated using a hybrid integration of silica planar lightwave circuits and LiNbO3 phase modulators and successfully operated at high baud rates corresponding to >100 Gbit/s. These technologies are promising for future spectrally efficient optical networks in which various modulation formats are used flexibly and adaptively.
- Development of Aerial Optical Closure for the High Demands of FTTH Service
Abstract
New components have been developed to enable aerial optical closures to accommodate a larger number of splitters. The maximum capacity has been increased from four to eight. This development which will reduce aerial facility congestion and cut construction costs.
Global Standardization Activities
NTT around the World
- NTT America
NTT America—The Chief Technology Officer’s Perspective
Abstract
NTT America, with its prominent headquarters in New York City, is the sales and operations group for NTT Communications’ products and services throughout North, Central, and South America. In this article, I would like to give readers a comprehensive look at NTT America’s capabilities, an assessment of some of its core assets and technologies, and a synopsis of the Office of the Chief Technology Officer (CTO). The synopsis will showcase a few of the current technology trends observed from NTT America’s viewpoint and detail many of the activities undertaken by the CTO.
Practical Field Information about Telecommunication Technologies
- EMC Countermeasure Products for DSL Services
Abstract
This article introduces EMC countermeasure products for overcoming electromagnetic compatibility problems in digital subscriber line (DSL) services, i.e., noise filters, which have been developed by NTT EAST. It is the fourth in a bimonthly series on the theme of practical field information about telecommunication technologies. This month’s contribution is from the EMC Engineering Group, Technical Assistance and Support Center, Maintenance and Service Operations Department, Network Business Headquarters.
External Awards/Papers Published in Technical Journals and Conference Proceedings
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