Oki Develops the World's First Optical Code Encoder/Decoder with a Dispersion Compensating Function
- Successful 40km Long-distance Transmission with 10Gbps Single Mode Fiber -
Tokyo, Japan, February 24, 2004 -- Oki Electric Industry Co., Ltd. (TSE: 6703) today announced that the company has succeeded in developing a new optical encoder/decoder for optical code division multiplexing (OCDM). The device is the world's first encoder/decoder with a dispersion compensation function, offering transmission capacity of up to 10Gbps in bandwidth for bi-directional real-time communications covering a distance of over 40km using single mode fiber (SMF). Compared with conventional devices, this product is more compact in size as it does not require dispersion compensating fiber. The device is suitable for large-capacity data transmission such as hundreds of channels of video content delivery. Oki will present this at the 2004 Optical Fiber Communication Conference and Exposition to be held from February 22 to 27 at the Los Angeles Convention Center.
The OCDM encoder/decoder developed by Oki is based on a Time-Spread/Wavelength-Hop (TS-WH) encoding/decoding method using Fiber Bragg Grating (FBG) technology. While improving the reflection characteristics of the FBG component, Oki also built in a sophisticated dispersion compensation function in the OCDM encoder/decoder device, the first of its kind in the world. This function enables the device to compensate for the chromatic dispersion in SMF, which causes time discrepancy in optical signals, and to extend the transmission distance from 10km to over 40km for the existing metro networks.
The OCDM technology Oki uses for the encoder/decoder offers flexible routing in a large-scale optical network. This technology allocates arbitrary numbers of signal channels to wavelengths by appropriately combining wavelengths and optical coding scheme. It realizes a simpler and more economical network management compared to the conventional wavelength division multiplexing (WDM) networks, which limit the number of signal channels according to the number of wavelengths.
As the demand for broadband services such as video content delivery grows, large-capacity transmissions up to 10Gbps over distances of 40km to 80km are required in metro networks. In order to enable a video-content delivery service that simultaneously offers several hundreds of channels, each of which requires 6Mbps to 30Mbps of bandwidth, a 10Gbps transmission capacity is needed. Oki's encoder/decoder device is suitable for such large-capacity data transmission.
"By introducing Oki's OCDM encoder/decoder to metro networks, users can implement flexible and high-capacity optical signal links," said Harushige Sugimoto, General Manager of the Corporate Research and Development Center at Oki Electric. "10Gbps bandwidth is wide enough to transmit hundreds of video channels. Customers will be able to enjoy multiple services simultaneously, involving video, voices, and data in a real broadband environment. I believe that our new device will drastically help expand the optical communications market."
Oki intends to introduce the commercial optical encoder/decoder products and the optical transceiver/receiver, based on the newly developed technology, to service providers offering various broadband services. The company plans to commence sample shipment within a year.
Glossary:
- Optical Code Division Multiplexing (OCDM):
- A method of optical multiplexing communication. An optical signal is encoded based on a certain set of optical codes. It allocates a single wavelength signal to multiple communication channels. By using time and the spectral domains of optical signals from the optical encoder/decoder effectively, the transmission capacity expands more flexibly and economically compared to the conventional WDM approach, in which only the signal wavelength is utilized.
- Fiber Bragg Grating (FBG):
- FBG is a component that periodically modulates refraction index along its core, and works as both encoder and decoder by changing the amplitude of incident optical signals. It works passively without converting optical signals into electrical signals, thus allowing for a much smaller optical transmission system with ultra fast signal operation at lower cost.
Notes:
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About Oki Electric Industry Co., Ltd.
Founded more than a century ago in 1881, Oki Electric Industry Co., Ltd. is Japan's first telecommunications manufacturer, with its headquarter in Tokyo, Japan. With the corporate vision, "Oki, Network Solutions for a Global Society," Oki Electric provides top-quality products, technologies and solutions to its customers through its telecommunications systems, information systems and electronic devices segments. All three segments are integrated into one effective organization that functions as a collective force to create exciting new products and technologies, including information and telecom converged solutions. Through its business activities, Oki Electric satisfies a spectrum of customer needs in various markets.
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