April 2022 Vol. 20 No. 442022

https://www.ntt-review.jp/archive/2022/202204.html

Front-line Researchers
Kazuhide Nakajima, Senior Distinguished Researcher, NTT Access Network Service Systems
Laboratories

Rising Researchers
Tomoki Murakami, Distinguished Researcher, NTT Access Network Service Systems
Laboratories/NTT Network Innovation Laboratories

Feature Articles
Software Technologies in the Data-centric Era
Software Technologies in the Data-centric Era
Next-generation Data Hub for Secure and Convenient Data Utilization across Organizational
Boundaries
High-resolution Multi-camera Analysis Infrastructure to Support Future Smart Cities
Test-activity Analysis for Efficient Iterative Testing

Feature Articles
The Forefront of Nanomechanics Research
Nanomechanics: Outline and Future Prospects
New Method of Chaos Generation by Using Nanomechanical Oscillator
Control of Elastic Waves Using Phonon Waveguides and Phononic Crystals
Development of an Optomechanical Device with Extremely Low Optical Energy Loss
Highly Sensitive Detection and Control of a Nanowire Mechanical Resonator Using an Optical
Microcavity
Fabrication of Suspended Nanowire Mechanical Devices Using Inkjet Technology

Regular Articles
High-speed Tunable Laser Based on Electro-optic Effect for Wavelength SwitchingGlobal Standardization Activities
Standardization Activities Related to Fiber-optic Systems and Active Devices in International
Electrotechnical Commission

Practical Field Information about Telecommunication Technologies
Development of Loss-evaluation Tool for Efficient Characterization of Optical Fiber Cables

Feature Articles
Software Technologies in the Data-centric Era

Software Technologies in the Data-centric Era▼AbstractWith the arrival of a data-centric society, where
various types of value are created from real-world
data, demand for system infrastructure andsoftware-development methods as businessevolves has risen to an even greater level. In thisarticle, we introduce various technologicalchallenges and the efforts of NTT laboratories,
particularly the NTT Software Innovation Center,in developing an information-processing
infrastructure for the data-centric era to meet therequirements of business evolution and support adata-centric society.

Customers
Manufacturing, agricultural, automotive industries,
public sector, etc.

Collection

Accumulation

Data-based activities
Analysis/Conversion

Data
Data sharing

Data analysis/valorization

Feature Articles
The Forefront of Nanomechanics Research

Nanomechanics: Outline and Future Prospects▼Abstract

Microelectromechanical systems (MEMS) technology, whichuses the mechanical motion of miniaturized structures
artificially fabricated on a chip, has been used in various fields
such as mobile communications and Internet-of-Things
devices. This article introduces the concepts and future
prospects of nanomechanics technology, which furtherextends the functionalities from MEMS technology, focusing
on research activities conducted at NTT laboratories.

AC voltage
for motion
drive

Conductive
areaElectrodes

Quantum dot

Current

Mecha

nicaloscillator (GaAs)

AC: alternating current

Regular Articles

High-speed Tunable Laser Based on Electro-optic Effect for
Wavelength Switching▼Abstract
We developed a high-speed tunable laser, the lasing wavelength of which istuned by the electro-optic (EO) effect of a semiconductor multi-quantum
well. The laser exhibited a tuning range of 35 nm (full C-band), which is theworld’s first of an electro-optically tunable laser. Thanks to the low-thermalgeneration and high-speed response of the EO effect, we also achieved
less-than-30-mW tuning-power dissipation and sub-nanosecond wavelengthswitching. The laser also showed a linewidth of less than 350 kHz, which isacceptable for conventional digital coherent systems. We also demonstrated
unprecedented high-speed wavelength switching for 128-Gbit/s coherent
signals with this laser, which will contribute to the All-Photonics Network.

200 µmFine

Coarse
RedCoarse
Blue

Phase

ACT

Semiinsulating
sub.

L0Le

RTF
Deep ridge/QCSE MQW

ACTRidge/gain MQW