quantum dot
Quantum dots are nano-size semiconductors which have completely quantized energy states, thereby enabling the realization of semiconductor lasers featuring extremely high efficiency. Research and development efforts are actively underway to use indium arsenite (IdAs) quantum dots as optical transmitters in photonic networks. Quantum dot lasers, which incorporate the use of quantum dots in the active light-emitting area region of semiconductor lasers, were proposed in 1982 by Professor Arakawa and Professor Sakaki of the University of Tokyo [Y. Arakawa and H. Sakaki: Appl. Phys. Lett., 40, 939 (1982)].
 optical metro-access systems
Optical transmission system using optical fibers within cities to enable user access. Optical transmission systems were initially used as long-distance telecommunication systems to connect large cities. The development of broadband transmission is now accelerating the spread of optical fibers to both homes and offices.
 high-speed optical LAN
Local Area Network (LAN) between computerized instruments for high-bit-rate data transmission. Currently, 10Gbps LAN is standardized.
 Fujitsu, University of Tokyo Develop World's First 10Gbps Quantum Dot Laser Featuring Breakthrough Temperature-Independent Output
Optical intensity ratio of the "1" level against the "0" level used to describe the modulation characteristics of lasers. In present optical communications, the high optical intensity is assigned to the "1" level and the low intensity to "0". A large extinction ratio is desirable for accurate discrimination of digital data.
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Press ContactsPublic & Investor Relations
Technical ContactsProfessor Yasuhiko Arakawa
Company:University of Tokyo
Technical ContactsLSI Group
Details are current on the day of issue of the press release and may be subject to change thereafter without prior notice.
Date: 10 September, 2004
Company: University of Tokyo, Fujitsu Limited, , , ,
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