Product category:
Optoelectronic Sensors, Switches and Receivers
News Release from: Oki Electric | Subject: OCDM encoder/decoder
Edited by the Electronicstalk Editorial
Team on 27 February 2004
Encoder/decoder boosts optical bandwidth
and range
Oki Electric has succeeded in developing a new optical encoder/decoder for optical code division multiplexing (OCDM).
Oki Electric 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 10Gbit/s in bandwidth for bidirectional real-time communications covering a distance of over 40km using single-mode fibre (SMF)
This article was originally published on Electronicstalk on 10 Apr 2002 at 8.00am (UK)
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Oki Electric claims to have developed a new optical-fibre access technology based on OCDM (optical code division multiplexing).
The OCDM encoder/decoder developed by Oki is based on a time-spread/wavelength-hop (TS-WH) encoding/decoding method using fibre Bragg grating (FBG) technology.
As well as 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 10 to over 40km for 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 realises 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 10Gbit/s over distances of 40 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 6 to 30Mbit/s of bandwidth, a 10Gbit/s 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 Centre at Oki Electric.
"10Gbit/s 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.
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