Product category:
Optical Transceivers, Transponders and Repeaters
News Release from: Oki Electric
Edited by the Electronicstalk Editorial
Team on 13 July 2004
OTDM system boosts datarate and range
Oki Electric has developed the world's first single-channel optical transmitter and receiver to transmit data at 160Gbit/s over a distance of 640km without forward-error correction.
Oki Electric has developed the world's first single-channel optical transmitter and receiver to transmit data at 160Gbit/s over a distance of 640km without forward-error correction The company will demonstrate the experimental transmitter at this week's International Optoelectronics Exhibition in Japan
This article was originally published on Electronicstalk on 10 Apr 2002 at 8.00am (UK)
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Oki Electric has developed a trio of high-power 1480nm pump laser diode modules for WDM (wavelength division multiplexing) optical transmission.
The new module is based on OTDM (optical time division multiplexing) technology.
It uses a free-space interconnected module structure for its delay-line circuit, which allows allocation of four 40Gbit/s optical modulators that use the space.
By multiplexing four 40Gbit/s modulators, Oki has succeeded in generating the 160Gbit/s 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 Harushige Sugimoto, Chief Technology Officer at Oki Electric.
"Oki plans to deploy sales to various research institutions as an interface equipment for ultra-high-capacity data transmission".
Because a 160Gbit/s optical signal is easily affected by temperature and tremor, it presents problems for stable long-term communications and long distance transmission.
In order to stabilise long-term communications, Oki has 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.
Oki's free-space structure OTDM module can generate carrier-suppressed 160Gbit/s OTDM signals that enable a transmission distance of 640km.
Oki plans shipment from 2005 to the worldwide market and aims to supply the transmitter and receiver as the future 160Gbit/s core communication system that is expected to be in practical use from 2010.
Part of this development was supported by a contract research from National Institute of Information and Communications Technology (NICT), the affiliated organisation of Japan's Ministry of Public Management, Home Affairs, Posts and Telecommunications.
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