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Oki optical device transmits 160Gbps over 640km

Posted: 16 Jul 2004 ?? ?Print Version ?Bookmark and Share

Keywords:oki electric? optical transmitter? receiver?

Oki Electric Ind. Co. Ltd disclosed that it has developed the world's first single channel optical transmitter and receiver that can transmit 160Gbps data over a distance of 640km (approximately 396.8 miles) without forward-error correction in an experimental level.

According to the company, it has succeeded in developing the optical transmitter that sends 160Gb in a single second based on OTDM (Optical Time Division Multiplexing) technology. The OTDM module uses a free-space interconnected module structure for its delay-line circuit, which allows allocation of four 40Gbps optical modulators that utilize the space. By multiplexing four 40Gbps modulators, Oki succeeded in generating 160Gbps optical signal.

"As high-capacity data is transmitted in a single second, this transmitter will make a strong impact not only to the telecommunication industry, but also to the digital movie distribution and the network computing industry," said CTO Harushige Sugimoto. "We [Oki] plan to deploy sales to various research institutions as an interface equipment for ultra high capacity data transmission."

To conduct a stable long-term communication, the company also developed an optical carrier phase controller that monitors relative carrier phase difference and sends feedback signal to modulators to revise carrier phase differences. For long distance transmission, it is an advantage to generate carrier-suppressed signals that offset overlapping signals to reduce wave distortion, compared with an in-phase signal.

Part of this development was supported by a contract research from National Institute of Information and Communications Technology (NICT), the affiliated organization of Japan's Ministry of Public Management, Home Affairs, Posts and Telecommunications.

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