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Oki Electric Succeeds in World's First 160Gb/s Data Transmission Trial over a Distance of 635km.

TOKYO -- Oki Electric Industry Co., Ltd. (TOKYO:6703) today announced it has succeeded in transmitting 160Gb/s data, which is equivalent to transmitting four movies (approx. 8 hours) in a single second over a distance of 635km. This experiment was conducted as part of the "Research and Development on Ultrahigh-speed Backbone Photonic Network Technologies" project, consigned by National Institute of Information and Communications Technology (NICT). To prove the results for this project, Oki used an optical testbed provided by Japan Gigabit Network II (JGN II) (1), and succeeded in transmitting the world's first 160Gb/s data, that included high-vision video (2). This field trial was the longest distance attempted to date on the JGN II optical testbed.

The experiment using JGN II testbed took place in December 2005 in cooperation with the Research Promotion Council of Keihanna Info-Communication Open Laboratory and was hosted by NICT. The optical testbed offered by JGN II is an optical fiber (single mode optical fiber 63.5km x 10 fiber cables) installed between Open Laboratory in Kyoto and Dojima Relay Station in Osaka. At each connection point an optical amplifier similar to a relay station for commercial-use 10Gb/s data transmissions, and a dispersion compensation fiber (3) were installed. It is also structured to increase the transmission distance by changing the number of turn back times.

At this field trial, Oki used a 254 km transmission route with two turn backs to achieve the world's first transmission of signal evaluation data simultaneous with high-vision video. The distance was increased by changing the number of turn backs, and as a result, succeeded in a total of 635 km with five turn backs, the longest yet achieved with the JGN II testbed.

Oki's optical 160Gb/s transceiver was exhibited at the International Optoelectronics Exhibition '04 in an experimental 120km transmission over optical fiber, which received great reviews as a stable and practical apparatus. Oki has also succeeded in a 640 km transmission using an 80km recirculating loop. To gain results for a more practical use for 635 km transmission, Oki evaluated the transmission paths on actual environment with changing temperatures, and also confirmed error free data transmission.

"The 160Gb/s optical transceiver creates optical data signals using time division multiplexing with individual modulation (4). Oki has been committed to this individual modulation and has developed the optical time division multiplexing module. The module used in this experiment reduces optical coupling loss by half, is one third the previous size, and offers increased usability," said Harushige Sugimoto, Senior Vice President and Chief Technology Officer at Oki Electric. "The success of the 635 km field trial proves it can be used for backbone lines such as the super high-speed optical communication between Tokyo and Osaka (500km), which is 16 times higher in speed than the 10Gb/s systems that are commercialized. 160Gb/s optical transmission is the next generation super high-speed optical transmission technology to be commercialized after 2010. We will continue to analyze the results we have obtained and will develop a 160Gb/s optical transceiver for real data transmission."

High-vision video transmission was conducted by connecting to a Photonic Network offered by The University of Electro-Communications. Anritsu Corporation has cooperated in the extraction of data from the experiment.


(1) Optical testbed provided by Japan Gigabit Network II (JGN II)

Working together with JGN II, NICT provides a next generation optical network R&D environment to manufactures and institutions who do not have their own environment.

(2) High-vision video

After a 10Gb/s optical signal that includes high-vision video data is created by The University of Electro-Communications, it is converted into a 40Gb/s electric signal through time division multiplexing by Anritsu Corporation. This electric signal is then inputted into Oki's individual modulation optical time division multiplexing module, which converts it to 160Gb/s optical data.

(3) Dispersion compensation fiber

Optical signals tend to deform when going through optical fibers, especially over longer distances. Dispersion compensation fiber is installed to correct the dispersion that occurred during transmission.

(4) Time division multiplexing with individual modulation

To create a data signal for 160Gb/s transmission, ordinarily the optical signal is multiplexed from 40Gb/s to 160Gb/s signal by using passive PLC (Planar Lightwave Circuit) pulse interleaver(x4). However, Oki's time division multiplexing module includes 4 modulators to create four 40Gb/s optical signals. By multiplexing the four signals, it can output one 160Gb/s optical signal.

About Oki Electric Industry Co., Ltd.

Founded in 1881, Oki Electric Industry Co., Ltd. is Japan's first telecommunications manufacturer, with its headquarters in Tokyo, Japan. With the corporate vision, "Oki, Network Solutions for a Global Society," Oki provides top-quality products, technologies and solutions to its customers through its info-telecom system business, semiconductor business and printer business. All three businesses function as a collective force to create exciting new products and technologies that satisfy a spectrum of customer needs in various markets. Visit Oki's global web site at


--This research was conducted as part of the "Research and Development on Ultrahigh-speed Backbone Photonic Network Technologies" project, consigned by National Institute of Information and Communications Technology (NICT)

--Names of companies and products are trademarks or registered trademarks of the respective companies and organizations.
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Publication:Business Wire
Geographic Code:9JAPA
Date:Mar 15, 2006
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