[WP1] [WP2] [WP3] [WP4] [WP5] [WP6] [WP7]Objectives
WP1 starts in month 1 and ends in month 30.
The objective of this WP is the experimental demonstration of
POF system transmission at 100 Mbit/s (for example to support
Fast Ethernet) over long distances, i.e., above 200-300 meters.
Description of work
The objectives of this WP1 will be carried out through an
extensive application of digital transmission techniques to POF
systems, in order to increase the reach of 100 Mbit/s POF
systems (Fast Ethernet) using one or more of the following
advanced digital transmission techniques:
- multilevel transmission, to reduce the required
bandwidth on POF, but also on components, such as LED and
A/D and D/A converters;
- electronic pre- and post-equalization
- Forward Error Correction (FEC) to counteract the
sensitivity loss introduced by multilevel modulation
The WP technical strategy is to counteract the bandwidth
limitations coming from TX-RX components and POF multimodal
dispersion by using multilevel transmission and/or equalization,
and to counteract the increased system margin required by
multilevel using the coding gain of a suitable FEC. The main
transmission problem to be overcome over long distance POF
systems is bandwidth-limitation, together with the usual
power-budget constraint. To this end, research activities will
be focused on bandwidth efficient modulation formats. In
particular, ISMB will mainly focus on baseband multilevel
modulation (such as 4-PAM and 8-PAM) while TUE will work on
phase-quadrature (I/Q) modulation (such as QPSK and multilevel
QAM) and on the use of more than one wavelength to transport the
digital quadrature signal.
The technical novelty of this WP will be in the selection and
augmentation of techniques which as such are already available
in other fields (in particular RF digital transmission), but
have to be adapted to make these optimally suited for POF
transmission.
These goals will be first investigated theoretically, then
demonstrated over an FPGA platform equipped with A/D and D/A
converters, and connected to a POF TX-RX systems. An FPGA
platform will greatly ease the development process.
In a first phase, optoelectronic components for the TX-RX pair
will be chosen among the best commercially available components.
In a second phase, thanks to a strong interaction with WP3 and
WP4, the experimental setup will be upgraded using components
coming from WP3 and fibers coming from WP4. The interaction with
these two WPs will be key to the success of WP1, since a great
deal of power budget and bandwidth improvement shall be granted
by components and fibers’ optimization.
The technologies developed in this WP could transform in a
product for industrial applications. Even if an ASIC
implementation is outside the scope of this project, a cost
analysis of it will anyway be carried out.
This WP will be led by ISMB, and will be carried out together
with TUE. Together they will develop, measure and test the
prototype system. LUCEAT shall participate by providing its
expertise on long distance POF systems, and on ad-hoc fibers.
Strong interactions will occur with POFAC, for the fiber
optimization (WP4) and FHG, DieMount and STM for the component
optimization (WP3).
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