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WO-Net:
Wavelength Division Multiplexing and OCDMA for Broadcast and Select
Networks
POSI/CPS/40009/2001,
FCT/MCES (2002-2004)
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Participating Institutions:
Instituto
das Telecomunicações-Polo Aveiro (coordinator), University of Algarve,
Instituto de
Engenharia de Sistemas e Computadores - INESC - Porto
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Summary:
This project aims to demonstrate a network
based on Optical Code Division Multiple Access (OCDMA) where the multiple access
to the media is free and based on an Broadcast/Select (B/S) Architecture. This
type of transmission methodology is not new, however, the approach that is aimed
within this project tries to innovate either in the network architecture or in
the code utilization and limitations. With the proposed architecture, we will
try to achieve further distances by concentrating the spectrally sliced spectrum
in a controlled block and using more pure spectral sources, lasers with narrow
spectral linewidth. Only one of these nodes will be present in the network,
simplifying controlling processes, increasing network stability and decreasing
nodes cost. In the user node, will try to have as much simplicity as it is
possible, by having the simple and cheaper, and totally optical in order to
reduce the complexity of the optics and electronics. By mixing the concepts of
Wavelength Division Multiplexing (WDM) and OCDMA, we aim an optimized code that
will result in an optimum number of users per band and the band optimum
parameters, always having in mind the optimization of the network cost and
complexity (number of lasers and complexity of the coder/decoder parts). Besides
the already presented objectives, we will try to develop an totally optical
router for this type of networks that will migrate codes in between bands and
codes available in the network or neighboring networks. Also, based on the main
components limitations will try to suggest the best utilization and limitations
of this type of network when compared to other equivalent configurations.
In summary, this project will try to improve the concept aiming to achieve a
more efficient and less expensive approximation, making this type of network
more appealing for practical and wide implementation. Doing this we will also
achieve better domain in the design and implementation of fiber bragg gratings
in order to have the best results for this type of application.
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